10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2021
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

    For the transition period from to

Commission File Number 001-38267

RIBBON COMMUNICATIONS INC.

(Exact name of Registrant as specified in its charter)

Delaware	82-1669692
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

6500 Chase Oaks Boulevard, Suite 100, Plano, Texas 75023

(Address of principal executive offices) (Zip code)

(978) 614-8100

(Registrant's telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001	RBBN	The Nasdaq Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x    No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes x    No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☒	Non-accelerated filer	☐
Smaller reporting company	☐	Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act) o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐    No x

As of July 22, 2021, there were 148,114,436 shares of the registrant's common stock, $0.0001 par value per share, outstanding.

RIBBON COMMUNICATIONS INC.

FORM 10-Q

QUARTERLY PERIOD ENDED JUNE 30, 2021

TABLE OF CONTENTS

Item		Page
	Cautionary Note Regarding Forward-Looking Statements	3
PART I FINANCIAL INFORMATION
1.	Financial Statements
	Condensed Consolidated Balance Sheets as of June 30, 2021 and December 31, 2020 (unaudited)	4
	Condensed Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2021 and 2020 (unaudited)	5
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three and Six Months Ended June 30, 2021 and 2020 (unaudited)	6
	Condensed Consolidated Statements of Stockholders' Equity for the Three and Six Months Ended June 30, 2021 and 2020 (unaudited)	7
	Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2021 and 2020 (unaudited)	9
	Notes to Condensed Consolidated Financial Statements (unaudited)	11
2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	42
3.	Quantitative and Qualitative Disclosures About Market Risk	56
4.	Controls and Procedures	57
PART II OTHER INFORMATION
1.	Legal Proceedings	57
2.	Unregistered Sales of Equity Securities and Use of Proceeds	58
5.	Other Information	58
6.	Exhibits	59
	Signatures	59

Cautionary Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains "forward-looking statements" within the meaning of the U.S. Private Securities Litigation Reform Act of 1995, which are subject to a number of risks and uncertainties. All statements other than statements of historical facts contained in this Quarterly Report on Form 10-Q, including statements regarding our future expenses, results of operations and financial position, integration activities, expected impacts of the ongoing COVID-19 pandemic, beliefs about our business strategy, expected benefits from our acquisition of ECI Telecom Group Ltd. ("ECI) and the sale of our Kandy Communications business, availability of components for the manufacturing of our products, plans and objectives of management for future operations, plans for future cost reductions, if any, restructuring activities, and plans for future product offerings, development and manufacturing are forward-looking statements. Without limiting the foregoing, the words "anticipates", "believes", "could", "estimates", "expects", "intends", "may", "plans", "seeks" and other similar language, whether in the negative or affirmative, are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Forward-looking statements are based on our current expectations and assumptions regarding our business, the economy and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are unknown and/or difficult to predict and that may cause our actual results, performance or achievements to be materially different from those expressed or implied by the forward-looking statements. Such risks and uncertainties include, but are not limited to, risks related to the ongoing COVID-19 pandemic on the global economy and financial markets as well as on the Company, our customers and suppliers, which may impact our sales, gross margin, customer demand and our ability to supply our products to our customers; failure to realize anticipated benefits of our acquisition of ECI; failure to achieve the expected benefits from the sale of our Kandy Communications business; supply chain disruptions resulting from component availability and/or geopolitical instabilities and disputes; unpredictable fluctuations in quarterly revenue and operating results; risks related to cybersecurity and data intrusion; failure to compete successfully against telecommunications equipment and networking companies; failure to grow our customer base or generate recurring business from our existing customers; credit risks; the timing of customer purchasing decisions and our recognition of revenues; economic conditions; the impact of restructuring and cost-containment activities; litigation; market acceptance of our products and services; rapid technological and market change; our ability to protect our intellectual property rights and obtain necessary licenses; our ability to maintain partner, reseller, distribution and vendor support and supply relationships; the potential for defects in our products; risks related to the terms of our credit agreement; higher risks in international operations and markets; increases in tariffs, trade restrictions or taxes on our products; currency fluctuations; and/or failure or circumvention of our controls and procedures. We therefore caution you against relying on any of these forward-looking statements.

Additional important factors that could cause actual results to differ materially from those in these forward-looking statements are also discussed in Part I, Item 2, "Management's Discussion and Analysis of Financial Condition and Results of Operations" of this Quarterly Report on Form 10-Q and Part I, Item 1A and Part II, Item 7A, "Risk Factors" and "Quantitative and Qualitative Disclosures About Market Risk," respectively, of our Annual Report on Form 10-K for the year ended December 31, 2020. Any forward-looking statement made by us in this Quarterly Report on Form 10-Q speaks only as of the date on which this Quarterly Report on Form 10-Q was first filed. We undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise.

3

PART I FINANCIAL INFORMATION

Item 1. Financial Statements

RIBBON COMMUNICATIONS INC.

Condensed Consolidated Balance Sheets

(in thousands, except share and per share data)

(unaudited)

	June 30, 2021		December 31, 2020
Assets
Current assets:
Cash and cash equivalents	$	112,155	$	128,428
Restricted cash	2,646		7,269
Accounts receivable, net	219,867		237,738
Inventory	46,556		45,750
Other current assets	31,739		28,461
Total current assets	412,963		447,646
Property and equipment, net	49,287		48,888
Intangible assets, net	384,352		417,356
Goodwill	416,892		416,892
Investments	106,012		115,183
Deferred income taxes	10,915		10,651
Operating lease right-of-use assets	57,869		69,757
Other assets	20,698		20,892
	$	1,458,988	$	1,547,265
Liabilities and Stockholders' Equity
Current liabilities:
Current portion of term debt	$	20,058	$	15,531
Accounts payable	57,939		63,387
Accrued expenses and other	89,762		134,865
Operating lease liabilities	17,974		17,023
Deferred revenue	101,471		96,824
Total current liabilities	287,204		327,630
Long-term debt, net of current	359,333		369,035
Operating lease liabilities, net of current	62,615		72,614
Deferred revenue, net of current	22,036		26,010
Deferred income taxes	17,993		16,842
Other long-term liabilities	40,526		48,281
Total liabilities	789,707		860,412
Commitments and contingencies (Note 19)
Stockholders' equity:
Preferred stock, $0.01 par value per share; 10,000,000 shares authorized, none issued and outstanding	—		—
Common stock, $0.0001 par value per share; 240,000,000 shares authorized; 148,057,301 shares issued and outstanding at June 30, 2021; 145,425,248 shares issued and outstanding at December 31, 2020	15		15
Additional paid-in capital	1,868,066		1,870,256
Accumulated deficit	(1,199,922)		(1,178,476)
Accumulated other comprehensive income (loss)	1,122		(4,942)
Total stockholders' equity	669,281		686,853
	$	1,458,988	$	1,547,265

See notes to the unaudited condensed consolidated financial statements.

4

RIBBON COMMUNICATIONS INC.

Condensed Consolidated Statements of Operations

(in thousands, except per share data)

(unaudited)

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Revenue:
Product	$	113,129	$	120,862	$	211,018	$	196,761
Service	98,081		89,631		192,964		171,714
Total revenue	211,210		210,493		403,982		368,475
Cost of revenue:
Product	46,641		50,579		91,086		86,558
Service	36,142		36,647		73,922		68,126
Total cost of revenue	82,783		87,226		165,008		154,684
Gross profit	128,427		123,267		238,974		213,791
Operating expenses:
Research and development	46,797		51,796		94,207		94,091
Sales and marketing	34,881		33,898		72,099		64,869
General and administrative	12,734		15,094		28,287		32,299
Amortization of acquired intangible assets	17,181		14,669		33,004		29,003
Acquisition-, disposal- and integration-related	1,052		857		2,249		13,241
Restructuring and related	2,830		5,361		8,780		7,436
Total operating expenses	115,475		121,675		238,626		240,939
Income (loss) from operations	12,952		1,592		348		(27,148)
Interest expense, net	(3,048)		(5,400)		(8,867)		(8,795)
Other income (expense), net	17,180		(2,407)		(8,268)		(3,251)
Income (loss) before income taxes	27,084		(6,215)		(16,787)		(39,194)
Income tax provision	(3,843)		(2,036)		(4,659)		(2,227)
Net income (loss)	$	23,241	$	(8,251)	$	(21,446)	$	(41,421)
Earnings (loss) per share:
Basic	$	0.16	$	(0.06)	$	(0.15)	$	(0.31)
Diluted	$	0.15	$	(0.06)	$	(0.15)	$	(0.31)
Weighted average shares used to compute earnings (loss) per share:
Basic	147,467		144,483		146,706		132,737
Diluted	154,160		144,483		146,706		132,737

See notes to the unaudited condensed consolidated financial statements.

5

RIBBON COMMUNICATIONS INC.

Condensed Consolidated Statements of Comprehensive Income (Loss)

(in thousands)

(unaudited)

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Net income (loss)	$	23,241	$	(8,251)	$	(21,446)	$	(41,421)
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on interest rate swap	(205)		(3,970)		6,464		(13,497)
Foreign currency translation adjustments	(447)		70		(400)		847
Other comprehensive (loss) income, net of tax	(652)		(3,900)		6,064		(12,650)
Comprehensive income (loss), net of tax	$	22,589	$	(12,151)	$	(15,382)	$	(54,071)

See notes to the unaudited condensed consolidated financial statements.

6

RIBBON COMMUNICATIONS INC.

Condensed Consolidated Statements of Stockholders' Equity

(in thousands, except shares)

(unaudited)

Three months ended June 30, 2021
	Common stock
	Shares	Amount		Additional paid-in capital		Accumulated deficit		Accumulated other comprehensive income (loss)		Total stockholders' equity
Balance at April 1, 2021	147,358,590	$	15	$	1,864,107	$	(1,223,163)	$	1,774	$	642,733
Exercise of stock options	213									—
Vesting of restricted stock awards and units	802,576									—
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(104,078)			(831)						(831)
Stock-based compensation expense				4,790						4,790
Other comprehensive loss								(652)		(652)
Net income						23,241				23,241
Balance at June 30, 2021	148,057,301	$	15	$	1,868,066	$	(1,199,922)	$	1,122	$	669,281

Six months ended June 30, 2021
	Common stock
	Shares	Amount		Additional paid-in capital		Accumulated deficit		Accumulated other comprehensive (loss) income		Total stockholders' equity
Balance at January 1, 2021	145,425,248	$	15	$	1,870,256	$	(1,178,476)	$	(4,942)	$	686,853
Exercise of stock options	13,602			24						24
Vesting of restricted stock awards and units	2,465,204									—
Vesting of performance-based stock units	1,525,681									—
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(1,372,434)			(12,064)						(12,064)
Stock-based compensation expense				9,850						9,850
Other comprehensive income								6,064		6,064
Net loss						(21,446)				(21,446)
Balance at June 30, 2021	148,057,301	$	15	$	1,868,066	$	(1,199,922)	$	1,122	$	669,281

7

RIBBON COMMUNICATIONS INC.

Condensed Consolidated Statements of Stockholders' Equity (continued)

(in thousands, except shares)

(unaudited)

Three months ended June 30, 2020
	Common stock
	Shares	Amount		Additional paid-in capital		Accumulated deficit		Accumulated other comprehensive (loss) income		Total stockholders' equity
Balance at April 1, 2020	144,351,304	$	14	$	1,860,150	$	(1,300,237)	$	(6,223)	$	553,704
Exercise of stock options	10,188			18						18
Vesting of restricted stock awards and units	500,570									—
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(5,298)			(16)						(16)
Stock-based compensation expense				3,222						3,222
Other comprehensive loss								(3,900)		(3,900)
Net loss						(8,251)				(8,251)
Balance at June 30, 2020	144,856,764	$	14	$	1,863,374	$	(1,308,488)	$	(10,123)	$	544,777

Six months ended June 30, 2020
	Common stock
	Shares	Amount		Additional paid-in capital		Accumulated deficit		Accumulated other comprehensive income (loss)		Total stockholders' equity
Balance at January 1, 2020	110,471,995	$	11	$	1,747,784	$	(1,267,067)	$	2,527	$	483,255
Exercise of stock options	13,202			23						23
Vesting of restricted stock awards and units	1,517,552									—
Vesting of performance-based stock units	315,866									—
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(278,402)			(808)						(808)
Shares issued as consideration in connection with the acquisition of ECI Telecom Group Ltd.	32,500,000	3		108,547						108,550
Shares issued as consideration in connection with the acquisition of Anova Data, Inc.	316,551			1,630						1,630
Stock-based compensation expense				6,198						6,198
Other comprehensive loss								(12,650)		(12,650)
Net loss						(41,421)				(41,421)
Balance at June 30, 2020	144,856,764	$	14	$	1,863,374	$	(1,308,488)	$	(10,123)	$	544,777

See notes to the unaudited condensed consolidated financial statements.

8

RIBBON COMMUNICATIONS INC.

Condensed Consolidated Statements of Cash Flows

(in thousands)

(unaudited)

	Six months ended
	June 30, 2021		June 30, 2020
Cash flows from operating activities:
Net loss	$	(21,446)	$	(41,421)
Adjustments to reconcile net loss to cash flows provided by operating activities:
Depreciation and amortization of property and equipment	8,475		8,260
Amortization of intangible assets	33,004		29,003
Amortization of debt issuance costs	3,684		2,554
Stock-based compensation	9,850		6,198
Deferred income taxes	918		97
Gain on sale of business	(2,772)		—
Decrease in fair value of investments	9,171		—
Reduction in deferred purchase consideration	—		(69)
Foreign currency exchange losses	2,013		3,463
Changes in operating assets and liabilities:
Accounts receivable	17,360		45,422
Inventory	(1,527)		773
Other operating assets	9,874		14,282
Accounts payable	(3,508)		(41,515)
Accrued expenses and other long-term liabilities	(57,739)		9,111
Deferred revenue	673		554
Net cash provided by operating activities	8,030		36,712
Cash flows from investing activities:
Purchases of property and equipment	(10,570)		(14,891)
Business acquisitions, net of cash acquired	—		(346,852)
Proceeds from sale of business	2,944		—
Proceeds from the sale of fixed assets	—		43,500
Net cash used in investing activities	(7,626)		(318,243)
Cash flows from financing activities:
Borrowings under revolving line of credit	—		615
Principal payments on revolving line of credit	—		(8,615)
Proceeds from issuance of term debt	74,625		403,500
Principal payments of term debt	(82,147)		(52,400)
Principal payments of finance leases	(507)		(668)
Payment of debt issuance costs	(789)		(10,573)
Proceeds from the exercise of stock options	24		23
Payment of tax withholding obligations related to net share settlements of restricted stock awards	(12,064)		(808)
Net cash (used in) provided by financing activities	(20,858)		331,074
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(442)		(142)
Net (decrease) increase in cash, cash equivalents and restricted cash	(20,896)		49,401
Cash, cash equivalents and restricted cash, beginning of year	135,697		44,643
Cash, cash equivalents and restricted cash, end of period	$	114,801	$	94,044

9

RIBBON COMMUNICATIONS INC.

Condensed Consolidated Statements of Cash Flows (continued)

(in thousands)

(unaudited)

	Six months ended
	June 30, 2021		June 30, 2020
Supplemental disclosure of cash flow information:
Interest paid	$	8,009	$	6,275
Income taxes paid	$	9,818	$	4,014
Income tax refunds received	$	974	$	196
Supplemental disclosure of non-cash investing activities:
Capital expenditures incurred, but not yet paid	$	2,090	$	3,522
Common stock issued as purchase consideration	$	—	$	110,180
Supplemental disclosure of non-cash financing activities:
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested	$	33,410	$	5,165

See notes to the unaudited condensed consolidated financial statements.

10

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(1) BASIS OF PRESENTATION

Business

Ribbon Communications Inc. ("Ribbon" or the "Company") is a leading global provider of communications technology to service providers and enterprises. The Company provides a broad range of software and high-performance hardware products, solutions and services that enable the secure delivery of data and voice communications for residential consumers and for small, medium, and large enterprises and industry verticals such as finance, education, government, utilities and transportation. Ribbon's mission is to create a recognized global technology leader providing cloud-centric solutions that enable the secure exchange of information, with unparalleled scale, performance and elasticity. The Company is headquartered in Plano, Texas, and has a global presence with research and development, or sales and support locations in over thirty-five countries around the world.

Basis of Presentation

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting only of normal recurring items, necessary for their fair presentation with accounting principles generally accepted in the United States of America ("GAAP") and with the rules and regulations of the U.S. Securities and Exchange Commission ("SEC").

On December 1, 2020 (the "Kandy Sale Date"), American Virtual Cloud Technologies, Inc. ("AVCT") completed the purchase of the Company's cloud-based enterprise service business (the "Kandy Communications Business") and accordingly, the revenue and expenses of the Kandy Communications Business are excluded from the Company's condensed consolidated financial statements for the three and six months ended June 30, 2021.

On March 3, 2020 (the "ECI Acquisition Date"), a subsidiary of the Company merged (the "ECI Acquisition") with ECI Telecom Group Ltd ("ECI"). The financial results of ECI are included in the Company's condensed consolidated financial statements for the period subsequent to the ECI Acquisition Date.

Interim results are not necessarily indicative of results for a full year or any future interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2020 (the "Annual Report"), which was filed with the SEC on February 26, 2021.

Operating Segments

The Company's chief operating decision maker (the "CODM") is its President and Chief Executive Officer. Effective in the fourth quarter of 2020 and in connection with the ECI Acquisition, the CODM began to assess the Company's performance based on the performance of two separate organizations within Ribbon: the Cloud and Edge segment ("Cloud and Edge") and the IP Optical Networks segment ("IP Optical Networks"). Financial information for the IP Optical Networks segment included in the Company's financial results for the six months ended June 30, 2020 is for the period subsequent to the ECI Acquisition Date through June 30, 2020.

Reclassifications

In the fourth quarter of 2020, the Company reclassified amounts recorded for amortization of acquired intangible assets in prior presentations from Cost of revenue - product and Sales and marketing to a separate line included in operating expenses in the condensed consolidated statements of operations, as management believes this presentation enhances the comparability of the Company's financial statements with industry peers. These reclassifications also did not impact the condensed consolidated balance sheets or statements of cash flows for any historical periods. The Company did not reclassify depreciation of property and equipment related to production activities from cost of revenue to other accounts.

11

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

These reclassifications for the three and six months ended June 30, 2020 were as follows (in thousands):

	Three months ended June 30, 2020						Six months ended June 30, 2020
	Prior presentation		Amounts reclassified		Revised presentation		Prior presentation		Amounts reclassified		Revised presentation
Product revenue	$	120,862			$	120,862	$	196,761			$	196,761
Service revenue	89,631				89,631		171,714				171,714
Total revenue	210,493		—		210,493		368,475		—		368,475
Cost of revenue - product	61,529		(10,950)		50,579		106,462		(19,904)		86,558
Cost of revenue - service	36,647				36,647		68,126				68,126
Total cost of revenue	98,176		(10,950)		87,226		174,588		(19,904)		154,684
Total gross profit	112,317		10,950		123,267		193,887		19,904		213,791
Research and development	51,796				51,796		94,091				94,091
Sales and marketing	37,617		(3,719)		33,898		73,968		(9,099)		64,869
General and administrative	15,094				15,094		32,299				32,299
Amortization of acquired intangible assets	—		14,669		14,669		—		29,003		29,003
Acquisition-, disposal- and integration-related	857				857		13,241				13,241
Restructuring and related	5,361				5,361		7,436				7,436
Total operating expenses	110,725		10,950		121,675		221,035		19,904		240,939
Income (loss) from operations	$	1,592	$	—	$	1,592	$	(27,148)	$	—	$	(27,148)

Certain reclassifications, not affecting previously reported net loss, have been made to the previously issued financial statements to conform to the current period presentation.

Significant Accounting Policies

The Company's significant accounting policies are disclosed in Note 2 to the Consolidated Financial Statements included in the Annual Report. There were no material changes to the significant accounting policies during the three months ended June 30, 2021.

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Ribbon and its wholly-owned subsidiaries. Intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates and Judgments

The preparation of financial statements in conformity with GAAP requires Ribbon to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and judgments relied upon in preparing these condensed consolidated financial statements include accounting for business combinations, revenue recognition for multiple element arrangements, inventory valuations, assumptions used to determine the fair value of stock-based compensation, intangible asset and goodwill valuations, including impairments, legal contingencies and recoverability of Ribbon's net deferred tax assets and the related valuation allowances. Ribbon regularly assesses these estimates and records changes in estimates in the period in which they become known. Ribbon bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results could differ from those estimates.

12

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Restricted Cash

The Company classifies as restricted cash all cash pledged as collateral to secure long-term obligations and all cash whose use is otherwise limited by contractual provisions.

At June 30, 2021, the Company had $2.6 million of restricted cash, representing restricted short-term bank deposits pledged to secure certain performance and financial bonds as security for the Company's obligations under tenders, contracts and to one of its main subcontractors.

At December 31, 2020, the Company had $7.3 million of restricted cash, comprised of $4.6 million restricted in connection with a tax payment on certain fixed assets formerly held by ECI that were sold in connection with the ECI Acquisition, and $2.7 million of restricted short-term bank deposits pledged to secure certain performance and financial bonds as security for the Company's obligations under tenders, contracts and to one of its main subcontractors.

Transfers of Financial Assets

The Company maintains customer receivables factoring agreements with a number of financial institutions primarily for IP Optical Networks sales outside of the United States. Under the terms of these agreements, the Company may transfer receivables to the financial institutions, on a non-recourse basis, provided that the financial institutions approve the receivables in advance. The Company maintains credit insurance policies from major insurance providers or obtains letters of credit from the customers for a majority of its factored trade receivables. The Company accounts for the factoring of its financial assets as a sale of the assets and records the factoring fees, when incurred, as a component of interest expense in the condensed consolidated statements of operations, and the proceeds from the sales of receivables are included in cash from operating activities in the condensed consolidated statements of cash flows. During the three and six months ended June 30, 2021, the Company received $32.1 million and $63.2 million, respectively, of cash from the sale of certain accounts receivable and recorded $0.2 million and $0.4 million, respectively, of interest expense in connection with these transactions. During the three and six months ended June 30, 2020, the Company received $30.7 million and $45.8 million, respectively, of cash from the sale of certain accounts receivable and recorded $0.3 million and $0.4 million, respectively, of interest expense in connection with these transactions.

Fair Value of Financial Instruments and Fair Value Hierarchy

The carrying amounts of the Company's financial instruments approximate their fair values and include cash equivalents, accounts receivable, borrowings under a revolving credit facility, accounts payable and long-term debt.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. The three-tier fair value hierarchy is based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:

Level 1. Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities.

Level 2. Level 2 applies to assets or liabilities for which there are inputs that are directly or indirectly observable in the marketplace, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets).

Level 3. Level 3 applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

13

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Recent Accounting Pronouncements

The Financial Accounting Standards Board ("FASB") issued the following accounting pronouncement which became effective for the Company in 2021, and which did not have a material impact on its condensed consolidated financial statements:

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes ("ASU 2019-12"), which modifies ASC 740 to simplify the accounting for income taxes. ASU 2019-12 addresses the accounting for hybrid tax regimes, tax basis step-up in goodwill obtained in a transaction that is not a business combination, separate financial statements of legal entities not subject to tax, intraperiod tax allocation exception to incremental approach, ownership changes in investments - changes from a subsidiary to an equity method investment, ownership changes in investments - changes from an equity method investment to a subsidiary, interim period accounting for enacted changes in tax law and year-to-date loss limitation in interim period tax accounting.

The FASB issued the following accounting pronouncement, which the Company does not believe will have a material impact on its condensed consolidated financial statements upon adoption:

In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope ("ASU 2021-01"), which refines the scope of Accounting Standards Codification 848, Reference Rate Reform ("ASC 848") and clarifies some of its guidance as part of the FASB's monitoring of global reference rate reform activities. ASU 2021-01 permits entities to elect certain optional expedients and exceptions when accounting for derivative contracts and certain hedging relationships affected by changes in the interest rates used for discounting cash flows, for computing variation margin settlements, and for calculating price alignment interest in connection with reference rate reform activities under way in global financial markets (the "discounting transition"). ASU 2021-01 is effective for the Company prospectively in any period through December 31, 2022 that a modification is made to the terms of the derivatives affected by the discounting transition.

(2) ECI ACQUISITION

On the ECI Acquisition Date, Ribbon completed its previously announced merger transaction with ECI in accordance with the terms of the Agreement and Plan of Merger, dated as of November 14, 2019, by and among Ribbon, ECI, an indirect wholly-owned subsidiary of Ribbon ("Merger Sub"), Ribbon Communications Israel Ltd. and ECI Holding (Hungary) kft, pursuant to which Merger Sub merged with and into ECI, with ECI surviving such merger as a wholly-owned subsidiary of Ribbon. Prior to the ECI Acquisition Date, ECI was a privately-held global provider of end-to-end packet-optical transport and software-defined networking ("SDN") and network function virtualization ("NFV") solutions for service providers, enterprises and data center operators.

As consideration for the ECI Acquisition, Ribbon issued the ECI shareholders and certain others 32.5 million shares of Ribbon common stock with a fair value of $108.6 million (the "Stock Consideration") and paid $322.5 million of cash (the "Cash Consideration"), comprised of $183.3 million to repay ECI's outstanding debt, including both principal and interest, and $139.2 million paid to ECI's selling shareholders. In addition, ECI shareholders received $33.4 million from the sale of certain of ECI's real estate assets. Cash Consideration was financed through cash on hand and committed debt financing consisting of a new $400 million term loan facility and new $100 million revolving credit facility, which was undrawn at the ECI Acquisition Date.

The ECI Acquisition has been accounted for as a business combination and the financial results of ECI have been included in the Company's condensed consolidated financial statements for the periods subsequent to the ECI Acquisition. The Company's financial results for the three months ended June 30, 2020 included $63.6 million of revenue and $17.1 million of net loss attributable to ECI. The Company's financial results for the six months ended June 30, 2020 included $93.6 million of revenue and $20.4 million of net loss attributable to ECI for the period subsequent to the ECI Acquisition.

The Company finalized the valuation of acquired assets, identifiable intangible assets and certain assumed liabilities in the fourth quarter of 2020. A summary of the allocation of the purchase consideration for ECI is as follows (in thousands):

14

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Fair value of consideration transferred:
Cash consideration:
Repayment of ECI outstanding debt obligations	$	183,266
Cash paid to selling shareholders	139,244
Payment to selling shareholders from sale of ECI real estate assets	33,400
Less cash and restricted cash acquired	(9,058)
Net cash consideration	346,852
Fair value of Ribbon stock issued	108,550
Fair value of total consideration	$	455,402
Fair value of assets acquired and liabilities assumed:
Current assets, net of cash and restricted cash acquired	$	120,203
Property and equipment	54,913
Intangible assets:
In-process research and development	34,000
Developed technology	111,900
Customer relationships	116,000
Trade names	3,000
Goodwill	191,996
Other noncurrent assets	37,528
Deferred revenue	(4,369)
Other current liabilities	(146,618)
Deferred revenue, net of current	(3,726)
Deferred tax liability	(13,308)
Other long-term liabilities	(46,117)
	$	455,402

The valuation of the acquired intangible assets is inherently subjective and relies on significant unobservable inputs. The Company used an income approach to value the acquired in-process research and development, developed technology, customer relationships and trade name intangible assets. The valuation for each of these intangible assets was based on estimated projections of expected cash flows to be generated by the assets, discounted to the present value at discount rates commensurate with perceived risk. The valuation assumptions take into consideration the Company's estimates of customer attrition, technology obsolescence and revenue growth projections. The Company is amortizing the identifiable intangible assets arising from the ECI Acquisition in relation to the expected cash flows from the individual intangible assets over their respective useful lives, which have a weighted average life of 12.38 years (see Note 6). Goodwill results from assets that are not separately identifiable as part of the transaction and is not deductible for tax purposes.

Pro Forma Results

The following unaudited pro forma information presents the condensed combined results of operations of Ribbon and ECI for the three and six months ended June 30, 2020 as if the ECI Acquisition had been completed on January 1, 2019, with adjustments to give effect to pro forma events that are directly attributable to the ECI Acquisition. These pro forma adjustments include an increase in research and development expense related to the conformance of ECI's cost capitalization policy to Ribbon's, additional amortization expense for the acquired identifiable intangible assets, a decrease in historical ECI interest expense reflecting the extinguishment of certain of ECI's debt as a result of the ECI Acquisition, and an increase in interest expense reflecting the new debt entered into by the Company in connection with the ECI Acquisition. Pro forma adjustments also include the elimination of acquisition-, disposal- and integration-related expenses directly attributable to the acquisition from the three and six months ended June 30, 2020 and inclusion of such costs in the comparable prior year periods.

The unaudited pro forma results do not reflect any operating efficiencies or potential cost savings that may result from the consolidation of the operations of Ribbon and ECI. Accordingly, these unaudited pro forma results are presented for illustrative

15

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

purposes and are not intended to represent or be indicative of the actual results of operations of the combined company that would have been achieved had the ECI Acquisition occurred at January 1, 2019, nor are they intended to represent or be indicative of future results of operations (in thousands, except per share amounts):

			4
	Three months ended			Six months ended
	June 30, 2020			June 30, 2020
Revenue	$	210,493		$	393,682
Net loss	$	(9,252)		$	(48,381)
Loss per share	$	(0.06)		$	(0.33)

Acquisition-, Disposal- and Integration-Related Expenses

Acquisition-related expenses include those expenses related to acquisitions that would otherwise not have been incurred by the Company, including professional and services fees, such as legal, audit, consulting, paying agent and other fees. Disposal-related expenses are professional and services fees related to disposals of subsidiaries or portions of the business. Integration-related expenses represent incremental costs related to combining the Company and its business acquisitions, such as third-party consulting and other third-party services related to merging the previously separate companies' systems and processes. The acquisition-related expenses in the three and six months ended June 30, 2020 primarily related to the ECI Acquisition. The disposal-related expenses in the six months ended June 30, 2021 relate to the Kandy Sale (as defined below).

The Company's acquisition-, disposal- and integration-related expenses for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Professional and services fees (acquisition-related)	$	143	$	640	$	143	$	13,014
Professional and services fees (disposal-related)	—		—		241		—
Integration-related expenses	909		217		1,865		227
	$	1,052	$	857	$	2,249	$	13,241

(3) SALE OF KANDY COMMUNICATIONS BUSINESS

Kandy Communications Business

On August 5, 2020, the Company announced that it had entered into a definitive agreement (as amended, the "Kandy Purchase Agreement") with AVCT to sell the Kandy Communications Business. Under the Kandy Purchase Agreement, AVCT agreed to purchase the assets and assume certain liabilities associated with the Kandy Communications Business, as well as all of the outstanding interests in Kandy Communications LLC, a subsidiary of the Company (the "Kandy Sale").

On December 1, 2020, the Company completed the Kandy Sale. The assets acquired and liabilities assumed by AVCT in connection with the Kandy Sale were primarily comprised of accounts receivable, property and equipment, trade accounts payable and employee-related accruals. As consideration, AVCT paid Ribbon $45.0 million, subject to certain adjustments, in the form of units of AVCT's securities (the "AVCT Units"), with each AVCT Unit consisting of: $1,000 in principal amount of AVCT’s Series A-1 convertible debentures (the “Debentures”); and (ii) one warrant to purchase 100 shares of AVCT common stock, $0.0001 par value (the “Warrants”), as consideration for the Kandy Sale. The Company received 43,778 AVCT Units as consideration on the Kandy Sale Date.

The Debentures bear interest at a rate of 10% per annum, which is being added to the principal amount of the Debentures, except upon maturity, in which case accrued and unpaid interest is payable in cash. The entire principal of each Debenture,

16

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

together with accrued and unpaid interest thereon, is due and payable on the earlier of the May 1, 2023 maturity date or the occurrence of a Change in Control as defined in the Kandy Purchase Agreement. Each Debenture is convertible, in whole or in part, at any time at the Company's option into that number of shares of AVCT common stock, calculated by dividing the principal amount being converted, together with all accrued and unpaid interest thereon, by the applicable conversion price, initially $3.45. The Debentures are subject to mandatory redemption if the AVCT stock price is at or above $6.00 per share for 40 trading days in any 60 consecutive trading day period, subject to the satisfaction of certain other conditions. The conversion price is subject to customary adjustments including, but not limited to, stock dividends, stock splits and reclassifications. At the Company's option, up to $5.0 million of the Debentures may be redeemed by AVCT at par in the event AVCT raises at least $50.0 million in its offering of AVCT Units. As of February 19, 2021, the stock price had traded above $6.00 for 40 days within a 60 consecutive trading day period, and accordingly, the Debentures will be converted to shares of AVCT common stock upon the completion of customary regulatory filings by AVCT.

The Warrants are independent of the Debentures and entitle the Company to purchase 4,377,800 shares of AVCT common stock at an exercise price of $0.01 per share. The Warrants expire on December 1, 2025, and were immediately exercisable on the Kandy Sale Date.

The Company had not redeemed any of the Debentures or exercised any of the Warrants as of June 30, 2021. The Company was also subject to a lock-up provision which limited the Company's ability to sell any shares of AVCT common stock underlying the Debentures and the Warrants prior to June 1, 2021, except in certain transactions.

The Company determined that the AVCT Units had a fair value of $84.9 million at the Kandy Sale Date, comprised of the Debentures with a fair value of $66.3 million and the Warrants with a fair value of $18.6 million. The value of the net assets sold to AVCT totaled $1.3 million, resulting in a gain on the sale of $83.6 million.

The Company had previously calculated the fair value of the Debentures using a Lattice-based valuation approach, which utilizes a binomial tree to model the different paths the price of AVCT's common stock might take over the Debentures' life by using assumptions regarding the stock price volatility and risk-free interest rate. These results were then used to calculate the fair value of the Debentures at each measurement date. The Company had previously used the Black-Scholes valuation model for estimating the fair value of the Warrants at each measurement date. The fair value of the Warrants was affected by AVCT's stock price as well as valuation assumptions, including the volatility of AVCT's stock price, expected term of the option, risk-free interest rate and expected dividends. Both the Lattice and Black-Scholes valuation models are based on available market data, giving consideration to all of the rights and obligations of each instrument and precluding the use of "blockage" discounts or premiums in determining the fair value of a large block of financial instruments. Upon the expiration of the lock-up period, the Company began to value the Debentures at each measurement date by multiplying the closing stock price of AVCT common stock by the number of shares upon conversion of the Debentures and Warrants.

The Company is calculating the fair value of the Debentures and Warrants at each quarter-end and recording any adjustments to the fair values in Other income (expense), net. At June 30, 2021 and December 31, 2020, the aggregate fair value of the Debentures and Warrants was $106.0 million and $115.2 million, respectively. The Company recorded a gain of $12.1 million in the three months ended June 30, 2021 and a loss of $11.8 million in the six months ended June 30, 2021 arising from the change in the fair value of the Debentures and Warrants. These amounts are included as components of Other income (expense), net, in its condensed consolidated statements of operations. The Company recorded $1.2 million and $2.7 million of interest income in the three and six months ended June 30, 2021, which was added to the principal of the Debentures, and which is included in Interest expense, net, in the condensed consolidated statements of operations. The fair values of the Debentures and Warrants are reported as Investments in the Company's condensed consolidated balance sheets at June 30, 2021 and December 31, 2020 and are classified as Level 2 fair value measurements within the fair value hierarchy (see Note 1).

(4) EARNINGS (LOSS) PER SHARE

Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares outstanding during the period. For periods in which the Company reports net income, diluted net earnings per share is determined by using the weighted average number of common and dilutive common equivalent shares outstanding during the period, unless the effect is antidilutive.

17

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

The calculations of shares used to compute earnings (loss) per share were as follows (in thousands):

	Three months ended		Six months ended
	June 30, 2021	June 30, 2020	June 30, 2021	June 30, 2020
Weighted average shares outstanding - basic	147,467	144,483	146,706	132,737
Potential dilutive common shares	6,693	—	—	—
Weighted average shares outstanding - diluted	154,160	144,483	146,706	132,737

Options to purchase the Company's common stock aggregating 0.1 million have not been included in the computation of diluted earnings per share for the three months ended June 30, 2021 because their effect would have been antidilutive. Options to purchase the Company's common stock and unvested restricted and performance-based stock awards and stock units aggregating 12.1 million shares have not been included in the computation of diluted loss per share for the six months ended June 30, 2021 because their effect would have been antidilutive. Options to purchase the Company's common stock and unvested restricted and performance-based stock awards and stock units aggregating 13.7 million shares have not been included in the computation of diluted loss per share for the three and six months ended June 30, 2020 because their effect would have been antidilutive.

(5) INVENTORY

Inventory at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

	June 30, 2021		December 31, 2020
On-hand final assemblies and finished goods inventories	$	49,725	$	46,921
Deferred cost of goods sold	1,752		1,165
	51,477		48,086
Less noncurrent portion (included in other assets)	(4,921)		(2,336)
Current portion	$	46,556	$	45,750

(6) INTANGIBLE ASSETS AND GOODWILL

The Company's intangible assets at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

June 30, 2021	Weighted average amortization period (years)	Cost		Accumulated amortization		Net carrying value
In-process research and development	*	$	34,000	$	—	$	34,000
Developed technology	7.93	306,380		162,811		143,569
Customer relationships	11.86	268,140		63,222		204,918
Trade names	3.88	5,000		3,135		1,865
Internal use software	3.00	730		730		—
	9.17	$	614,250	$	229,898	$	384,352

18

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

December 31, 2020	Weighted average amortization period (years)	Cost		Accumulated amortization		Net carrying value
In-process research and development	*	$	34,000	$	—	$	34,000
Developed technology	7.93	306,380		143,050		163,330
Customer relationships	11.86	268,140		50,627		217,513
Trade names	3.88	5,000		2,487		2,513
Internal use software	3.00	730		730		—
	9.17	$	614,250	$	196,894	$	417,356

* An in-process research and development intangible asset has an indefinite life until the product is generally available, at which time such asset is typically reclassified to developed technology.

Estimated future amortization expense for the Company's intangible assets at June 30, 2021 was as follows (in thousands):

Years ending December 31,
Remainder of 2021	$	33,621
2022	60,449
2023	53,966
2024	46,899
2025	40,338
2026	36,489
Thereafter	112,590
	$	384,352

There were no changes to the carrying value of the Company's goodwill in the six months ended June 30, 2021. The changes in the carrying value of the Company's goodwill in the six months ended June 30, 2020 were as follows (in thousands):

	Cloud and Edge		IP Optical Networks		Total
Balance at January 1, 2020*	$	224,896	$	—	$	224,896
Acquisition of ECI	—		191,996		191,996
Balance at June 30, 2020	$	224,896	$	191,996	$	416,892

(1) Balance is presented net of accumulated impairment losses of $167.4 million for the Cloud and Edge segment.

The components of goodwill at June 30, 2021 and 2020 were as follows (in thousands):

	Cloud and Edge		IP Optical Networks		Total
Balance at June 30, 2021
Goodwill	$	392,302	$	191,996	$	584,298
Accumulated impairment losses	(167,406)		—		(167,406)
	$	224,896	$	191,996	$	416,892
Balance at June 30, 2020
Goodwill	$	392,302	$	191,996	$	584,298
Accumulated impairment losses	(167,406)		—		(167,406)
	$	224,896	$	191,996	$	416,892

19

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

(7) ACCRUED EXPENSES AND OTHER

Accrued expenses at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

	June 30, 2021		December 31, 2020
Employee compensation and related costs	$	40,208	$	66,039
Other	49,554		68,826
	$	89,762	$	134,865

(8) WARRANTY ACCRUALS

The changes in the Company's accrual balance in the six months ended June 30, 2021 were as follows (in thousands):

Balance at January 1, 2021	$	14,855
Current period provisions	605
Settlements	(2,761)
Balance at June 30, 2021	$	12,699

Of the amounts recorded at June 30, 2021 and December 31, 2020, $5.8 million and $6.5 million, respectively, were current and included as components of Accrued expenses and other, and $6.9 million and $8.4 million, respectively, were long-term and included as components of Other long-term liabilities in the Company's condensed consolidated balance sheets.

(9) RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES

Restructuring and related expense includes both restructuring expense for severance and related costs and facilities-related costs, primarily comprised estimated future variable lease costs for vacated properties with no intent or ability of sublease, and accelerated rent amortization expense.

For restructuring events that involve lease assets and liabilities, the Company applies lease reassessment and modification guidance and evaluates the right-of-use assets for potential impairment. If the Company plans to exit all or distinct portions of a facility and does not have the ability or intent to sublease, the Company will accelerate the amortization of each of those lease components through the vacate date. The accelerated amortization is recorded as a component of Restructuring and related expense in the Company's condensed consolidated statements of operations. Related variable lease expenses will continue to be expensed as incurred through the vacate date, at which time the Company will reassess the liability balance to ensure it appropriately reflects the remaining liability associated with the premises and record a liability for the estimated future variable lease costs.

Restructuring and related expense for the three and six months ended June 30, 2021 and 2020 was comprised of the following (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Severance and related costs	$	1,926	$	4,716	$	2,595	$	6,487
Variable and other facilities-related costs	904		$	645	2,817		879
Accelerated amortization of lease assets due to cease-use	—		$	—	3,368		70
	$	2,830	$	5,361	$	8,780	$	7,436

Accelerated Rent Amortization

Accelerated rent amortization is recognized from the date that the Company commences the plan to fully or partially vacate

20

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

a facility, for which there is no intent or ability to enter into a sublease, through the final vacate date. The accelerated rent amortization recorded in connection with the Facilities Initiative reduced the value of the Company's Operating lease right-of-use assets recorded in the Company's condensed consolidated balance sheets at June 30, 2021 and December 31, 2020, respectively. The liability for the total lease payments for each respective facility is included as a component of Operating lease liabilities in the Company's condensed consolidated balance sheets, both current and noncurrent (see Note 17). The Company may incur additional future expense if it is unable to sublease other locations included in its restructuring initiatives.

2020 Restructuring Initiative

In 2020, the Company implemented a restructuring plan to eliminate certain positions and redundant facilities, primarily in connection with the ECI Acquisition, to further streamline the Company's global footprint and improve its operations (the "2020 Restructuring Initiative"). In connection with this initiative, the Company expects to eliminate duplicate functions arising from the ECI Acquisition and support its efforts to integrate the two companies.

The Company recorded restructuring and related expense of $1.9 million and $4.7 million in connection with the 2020 Restructuring Initiative in the three months ended June 30, 2021 and 2020, respectively, and $2.3 million and $5.8 million in the six months ended June 30, 2021 and 2020, respectively.

The amount recorded in the three months ended June 30, 2021 was comprised of $1.9 million for severance and related costs for approximately 15 employees and nominal expense for variable costs related to restructured facilities. The amount recorded in the six months ended June 30, 2021 was comprised of $2.6 million for severance and related costs for approximately 25 employees and $0.4 million of expense for variable costs related to restructured facilities, offset by a credit of $0.7 million for changes in estimate to previously recorded facilities-related amounts. The amount recorded in the six months ended June 30, 2020 represents severance and related costs for approximately 75 employees, of which $4.7 million was recorded in the three months ended June 30, 2020 and $1.1 million was recorded in the three months ended March 31, 2020. The Company expects the amount accrued for severance at June 30, 2021 will be paid in 2021. The Company expects that it will record additional restructuring and related expense approximating $2 million under the 2020 Restructuring Initiative in the aggregate for severance and planned facility consolidations. A summary of the 2020 Restructuring Initiative accrual activity for severance and related costs for the six months ended June 30, 2021 is as follows (in thousands):

	Balance at January 1, 2021		Initiatives charged to expense		Adjustments for changes in estimate		Cash payments		Balance at June 30, 2021
Severance	$	5,237	$	2,595	$	—	$	(4,178)	$	3,654
Facilities	1,256		382		(670)		(949)		19
	$	6,493	$	2,977	$	(670)	$	(5,127)	$	3,673

2019 Restructuring and Facilities Consolidation Initiative

In June 2019, the Company implemented a restructuring plan to further streamline the Company's global footprint, improve its operations and enhance its customer delivery (the "2019 Restructuring Initiative"). The 2019 Restructuring Initiative includes facility consolidations, refinement of the Company's research and development activities, and a reduction in workforce. The facility consolidations under the 2019 Restructuring Initiative (the "Facilities Initiative") include a consolidation of the Company's North Texas sites into a single campus, housing engineering, customer training and support, and administrative functions, as well as a reduction or elimination of certain excess and duplicative facilities worldwide. In addition, the Company is substantially consolidating its global software laboratories and server farms into two lower cost North American sites. The Company continues to evaluate its properties included in the Facilities Initiative for accelerated amortization and/or right-of-use asset impairment. The Company expects that the actions under the Facilities Initiative will be completed in 2021.

In connection with the 2019 Restructuring Initiative, the Company recorded restructuring and related expense of $0.9 million and $0.7 million in the three months ended June 30, 2021 and 2020, respectively, and $6.5 million and $1.7 million in the six months ended June 30, 2021 and 2020, respectively.

21

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

The amount recorded in the three months ended June 30, 2021 related to variable facilities costs. Of the amount recorded in the six months ended June 30, 2021, $3.4 million was for accelerated amortization of lease assets and $3.1 million related to variable and other facilities-related costs in connection with facility consolidations. The amount recorded in the three months ended June 30, 2020 primarily related to facility consolidations. The amount recorded in the six months ended June 30, 2020 was comprised of $0.7 million for severance and related costs for five employees and $1.0 million related to facility consolidations. As of June 30, 2021, the amounts accrued for severance and related costs had been paid in full. The Company estimates that it will record nominal, if any, additional restructuring and related expense in connection with this initiative.

A summary of the 2019 Restructuring Initiative accrual activity for the six months ended June 30, 2021 is as follows (in thousands):

	Balance at January 1, 2021		Initiatives charged to expense		Reclassify accelerated amortization to operating lease liabilities		Cash payments		Balance at June 30, 2021
Severance	$	173	$	—	$	—	$	(173)	$	—
Facilities	766		6,473		(3,368)		(1,943)		1,928
	$	939	$	6,473	$	(3,368)	$	(2,116)	$	1,928

Balance Sheet Classification

The current portions of accrued restructuring are included as a component of Accrued expenses and the long-term portions of accrued restructuring are included as a component of Other long-term liabilities in the condensed consolidated balance sheets. The long-term portions of accrued restructuring relate to facilities and totaled $1.9 million at June 30, 2021 and $0.8 million at December 31, 2020.

(10) DEBT

2020 Credit Facility

On March 3, 2020, the Company entered into a Senior Secured Credit Facilities Credit Agreement (as amended, the "2020 Credit Facility"), by and among the Company, as a guarantor, Ribbon Communications Operating Company, Inc., as the borrower ("Borrower"), Citizens Bank, N.A. ("Citizens"), as administrative agent, a lender, issuing lender, swingline lender, joint lead arranger and bookrunner, Santander Bank, N.A., as a lender, joint lead arranger and bookrunner, and the other lenders party thereto (each, together with Citizens Bank, N.A. and Santander Bank, N.A., referred to individually as a "Lender", and collectively, the "Lenders"). The proceeds of the 2020 Credit Facility were used, in part, to pay off in full all obligations of the Company under its prior credit facility (the "2019 Credit Facility").

The 2020 Credit Facility provides for $500 million of commitments from the lenders to the Borrower, comprised of $400 million in term loans (the "2020 Term Loan Facility") and a $100 million facility available for revolving loans (the "2020 Revolving Credit Facility"). Under the 2020 Revolving Credit Facility, a $30 million sublimit is available for letters of credit and a $20 million sublimit is available for swingline loans. Under the 2020 Credit Facility, the Company was originally required to make quarterly principal payments aggregating approximately $10 million in the first year, $20 million per year for the following three years, and $30 million in the last year, with the remaining balance due on the maturity date. The 2020 Credit Facility also requires periodic interest payments until maturity.

The indebtedness and other obligations under the 2020 Credit Facility are unconditionally guaranteed on a senior secured basis by the Company, Edgewater Networks, Inc., a wholly-owned subsidiary of the Company, and GENBAND Inc., a wholly-owned subsidiary of the Company (together, the "Guarantors"). The facilities under the 2020 Credit Facility are secured by first-priority liens on substantially all of the assets of the Borrower and the Guarantors, including substantially all of the assets of the Company.

22

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

The 2020 Credit Facility requires compliance with certain financial covenants, including a minimum Consolidated Fixed Charge Coverage Ratio and a maximum Consolidated Net Leverage Ratio (each as defined in the 2020 Credit Facility, and each tested on a quarterly basis).

In addition, the 2020 Credit Facility contains various covenants that, among other restrictions, limit the Company’s and its subsidiaries’ ability to incur or assume indebtedness; grant or assume liens; make acquisitions or engage in mergers; sell, transfer, assign or convey assets; repurchase equity and make dividend and certain other restricted payments; make investments; engage in transactions with affiliates; enter into sale and leaseback transactions; enter into burdensome agreements; change the nature of its business; modify their organizational documents; and amend or make prepayments on certain junior debt.

The 2020 Credit Facility contains events of default that are customary for a secured credit facility. If an event of default relating to bankruptcy or other insolvency events with respect to the Company or any of its subsidiaries occurs, all obligations under the 2020 Credit Facility will immediately become due and payable. If any other event of default occurs under the 2020 Credit Facility, the lenders may accelerate the maturity of the obligations outstanding under the Credit Facility and exercise other rights and remedies, including charging a default rate of interest equal to 2.00% per year above the rate that would otherwise be applicable. In addition, if any event of default exists under the 2020 Credit Facility, the lenders can commence foreclosure or other actions against the collateral.

On August 18, 2020 (the "First Amendment Effective Date"), the Borrower entered into a First Amendment to the 2020 Credit Facility (the "First Amendment"). Pursuant to an assignment and assumption agreement entered into by Citizens and certain affiliates of Whitehorse Capital on the First Amendment Effective Date (collectively, "HIG Whitehorse"), and consented to by Citizens and the Borrower, $75 million of the 2020 Term Loan Facility, designated as the Term B Loan (the "Term B Loan"), was assigned from Citizens to HIG Whitehorse. The remaining $325 million of the 2020 Term Loan Facility that was not assigned to HIG Whitehorse was deemed the Term A Loan (the "Term A Loan" and, together with the Term B Loan, the "Amended 2020 Term Loan Facility").

The Term A Loan and the 2020 Revolving Credit Facility mature in March 2025. The Term A Loan and 2020 Revolving Credit Facility bear interest at the Borrower's option at either the LIBOR rate plus a margin ranging from 1.50% to 3.50% per year, or the base rate (the highest of the Federal Funds Effective Rate (as defined in the 2020 Credit Facility) plus 0.50%, or the prime rate announced from time to time in The Wall Street Journal) plus a margin ranging from 0.50% to 2.50% per year (the "Applicable Margin"). The Applicable Margin varies depending on the Company's Consolidated Net Leverage Ratio (as defined in the 2020 Credit Agreement). The base rate and the LIBOR rate are each subject to a zero percent floor. The Company was required to make quarterly principal payments on the Term A Loan aggregating approximately $10 million in the first year, $16 million per year in each of the next two years, $20 million in the fourth year and $16 million in the last year, with the final payment approximating $244 million due on the maturity date. The Borrower could prepay all amounts under the Term A Loan and the 2020 Revolving Credit Facility at any time without premium or penalty (other than customary LIBOR breakage costs), subject to certain notice requirements.

The Term B Loan was scheduled to mature in March 2026 and bore interest, at the Borrower's option, at either the LIBOR rate plus a margin of 7.50% per year, or the base rate (the highest of the Federal Funds Effective Rate (as defined in the First Amendment) plus 0.50%, or the prime rate announced from time to time in The Wall Street Journal, plus a margin of 6.50% per year. The Term B Loan had a lower rate of amortization than the Term A Loan and was subject to a 1.0% premium if voluntarily repaid in connection with a repricing transaction (as defined in the 2020 Credit Facility) occurring prior to the six month anniversary of the First Amendment Effective Date. The Company was required to make quarterly principal payments totaling approximately $1 million in the first year and $8 million in the aggregate over the next four and a half years, with the final payment approximating $66 million.

The First Amendment reduced the Borrower's ability to incur new tranches of term loans, or increases in commitments under the Amended 2020 Term Loan Facility or the 2020 Revolving Credit Facility. Specifically, such indebtedness could be incurred up to an aggregate dollar amount equal to 75% of the Company's Consolidated Adjusted EBITDA (as defined in the 2020 Credit Facility), reduced from 100% prior to the First Amendment, as of the most recently ended fiscal quarter for which financial statements had been delivered to the lenders, plus additional amounts, so long as the Borrower's Consolidated Net Leverage Ratio (as defined in the 2020 Credit Agreement) did not exceed 2.25:1.00, reduced from 2.75:1.00 under the 2020

23

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Credit Agreement. The First Amendment also reduced the amount of Unrestricted Cash (as defined in the 2020 Credit Agreement) used in calculating the Borrower's Consolidated Net Leverage Ratio from $25 million to $10 million.

On December 1, 2020, the Borrower entered into a Second Amendment to the 2020 Credit Facility to obtain consent for an equity exchange with AVCT in connection with the Kandy Sale, as well as to amend certain other provisions of the 2020 Credit Facility.

At December 31, 2020, the Company had an outstanding Term A Loan balance of $318.5 million at an average interest rate of 3.4%, and an outstanding Term B Loan balance of $74.6 million at an average interest rate of 8.4%. The 2020 Revolving Credit Facility did not have an outstanding balance but had $5.6 million of letters of credit outstanding with an interest rate of 2.5%.

On March 3, 2021 (the "Third Amendment Effective Date"), the Company, the Borrower and certain of its subsidiaries entered into a Third Amendment to Credit Agreement (the "Third Amendment"), which further amended the 2020 Credit Facility. The Third Amendment provided for an incremental term loan facility to the Borrower in the original principal amount of $74.6 million, the proceeds of which were used on the Third Amendment Effective Date to consummate an open market purchase of all outstanding amounts under the Term B Loan. Upon the consummation of the open market purchase, the Term B Loans were assigned to the Borrower and immediately cancelled, such that the outstanding amount under the Term A Loan and incremental term loan facility were combined and held by the Lenders (the "2020 Term Loan") with the same terms as the Term A Loan. The Company wrote off $2.5 million of capitalized debt issuance costs in connection with the Third Amendment, which is included in Interest expense, net, in the Company's condensed consolidated statement of operations for the six months ended June 30, 2021. The Company is required to make quarterly principal payments on the 2020 Term Loan aggregating approximately $20 million per year in the first three years and $30 million in the fourth year, with the final payment approximating $300 million due on the maturity date.

The Third Amendment increased the Borrower's ability to incur new incremental revolving commitments or term loans. Such indebtedness can be incurred up to an aggregate dollar limit equal to 100% of the Company's Consolidated Adjusted EBITDA (as defined in the 2020 Credit Facility) as of the most recently ended fiscal quarter for which financial statements have been delivered to the Lenders, plus additional amounts, so long as the Borrower's Consolidated Net Leverage Ratio (as defined in the Credit Agreement) does not exceed 2.75:1.00, increased from 2.25:1.00 under the First Amendment. The Third Amendment also increased the amount of Unrestricted Cash (as defined in the 2020 Credit Facility) used in calculating the Borrower's Consolidated Net Leverage Ratio from $10.0 million to $25.0 million.

At June 30, 2021, the Company had an outstanding 2020 Term Loan balance of $385.5 million at an average interest rate of 3.40% and $6.4 million of letters of credit outstanding with an interest rate of 2.50%.

The Company was in compliance with all covenants of the 2020 Credit Facility at both June 30, 2021 and December 31, 2020.

Short-Term Loans

From time to time, the Company enters into uncommitted and unsecured short-term loans to finance exports in China. The Company did not have any such short-term loans outstanding at June 30, 2021 and December 31, 2020.

Letters of Credit and Performance and Bid Bonds

The Company uses letters of credit, performance and bid bonds in the course of its business. At June 30, 2021, the Company had bank guarantees, performance and bid bonds under various uncommitted facilities (collectively, the "Guarantees") aggregating $24.9 million and $6.4 million of letters of credit under the 2020 Credit Facility (the "Letters of Credit"). At December 31, 2020, the Company had Guarantees aggregating $27.0 million and $5.6 million of Letters of Credit. At June 30, 2021 and December 31, 2020, the Company had cash collateral of $2.6 million and $2.7 million, respectively, supporting the Guarantees, which are included in Restricted cash in the condensed consolidated balance sheets.

24

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

(11) DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

The Company is exposed to financial market risk related to foreign currency fluctuations and changes in interest rates. These exposures are actively monitored by management. To manage the volatility related to the exposure to changes in interest rates, the Company has entered into a derivative financial instrument. Management's objective is to reduce, where it is deemed appropriate to do so, fluctuations in earnings and cash flows associated with changes in interest rates. Ribbon's policies and practices are to use derivative financial instruments only to the extent necessary to manage exposures. Ribbon does not hold or issue derivative financial instruments for trading or speculative purposes.

The Company records derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a specific risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge, or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk even though hedge accounting does not apply or the Company elects not to apply hedge accounting.

Cash Flow Hedge of Interest Rate Risk

The 2020 Term Loan Facility had outstanding balances of $385.5 million and $393.1 million at June 30, 2021 and December 31, 2020, respectively. The 2020 Revolving Credit Facility was undrawn at both June 30, 2021 and December 31, 2020. Borrowings under the 2020 Credit Facility have variable interest rates based on LIBOR (see Note 10). As a result of exposure to interest rate movements, during March 2020, the Company entered into an interest rate swap arrangement, which effectively converted its $400 million term loan with its variable interest rate based upon one-month LIBOR to an aggregate fixed rate of 0.904%, plus a leverage-based margin as defined in the 2020 Credit Facility. The notional amount of this swap at June 30, 2021 was $400 million, and the swap matures on March 3, 2025, the same date the 2020 Credit Facility matures.

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company is using an interest rate swap as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of designated derivatives that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) in the condensed consolidated balance sheet and is subsequently reclassified into earnings in the period that the hedged forecasted transactions affect earnings. During the three and six months ended June 30, 2021 and 2020, such a derivative was used to hedge the variable cash flows associated with the outstanding borrowings under the 2020 Credit Facility and the Company has accounted for this derivative as an effective hedge. Any ineffective portion of the change in the fair value of the derivative would be recognized directly in earnings.

Amounts reported in accumulated other comprehensive income (loss) related to the Company's derivative are reclassified to interest expense as interest is accrued on the Company’s variable-rate debt. Based upon projected forward rates, the Company estimates as of June 30, 2021 that $3.2 million may be reclassified as an increase to interest expense over the next twelve months.

The impact of the Company’s derivative financial instrument on its condensed consolidated statement of comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

25

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion)	$	(1,015)	$	(4,320)	$	4,875	$	(13,657)
Amount reclassified from accumulated other comprehensive income (loss) to interest expense (effective portion)	810		350		1,589		160
	$	(205)	$	(3,970)	$	6,464	(13,497)

The fair values and locations in the condensed consolidated balance sheets at June 30, 2021 and December 31, 2020 of the Company's derivative liability designated as a hedging instrument were as follows (in thousands):

	Balance sheet location	June 30, 2021		December 31, 2020
Interest rate derivative - liability derivative	Accrued expenses and other	$	3,172	$	3,157
Interest rate derivative - liability derivative	Other long-term liabilities	$	1,312	$	7,791

The Company has classified the interest rate derivative aggregating $4.5 million and $10.9 million at June 30, 2021 and December 31, 2020, respectively, as Level 2 fair value measurements within the fair value hierarchy (see Note 1).

(12) REVENUE RECOGNITION

The Company derives revenue from two primary sources: products and services. Product revenue includes the Company's hardware and software that function together to deliver the products' essential functionality. Software and hardware are also sold on a standalone basis. Services include customer support (software updates, upgrades and technical support), consulting, design services, installation services and training. Generally, contracts with customers contain multiple performance obligations, consisting of products and services. For these contracts, the Company accounts for individual performance obligations separately if they are considered distinct.

When an arrangement contains more than one performance obligation, the Company will allocate the transaction price to each performance obligation on a relative standalone selling price basis. The Company utilizes the observable price of goods and services when they are sold separately to similar customers in order to estimate standalone selling price.

The Company's software licenses typically provide a perpetual right to use the Company's software. The Company also sells term-based software licenses that expire and Software-as-a-Service ("SaaS")-based software which are referred to as subscription arrangements. The Company does not customize its software nor are installation services required, as the customer has a right to utilize internal resources or a third-party service company. The software and hardware are delivered before related services are provided and are functional without professional services or customer support. The Company has concluded that its software licenses are functional intellectual property that are distinct, as the user can benefit from the software on its own. Product revenue is typically recognized upon transfer of control or when the software is made available for download, as this is the point the user of the software can direct the use of, and obtain substantially all of the remaining benefits from, the functional intellectual property. The Company begins to recognize software revenue related to the renewal of subscription software licenses at the start of the subscription period.

The Company offers warranties on its products. Certain of the Company's warranties are considered to be assurance-type in nature, ensuring the product is functioning as intended. Assurance-type warranties do not represent separate performance obligations. The Company also sells separately-priced maintenance service contracts which qualify as service-type warranties and represent separate performance obligations. The Company does not allow and has no history of accepting product returns.

26

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Services revenue includes revenue from customer support and other professional services. Customer support includes software updates on a when-and-if-available basis, telephone support, integrated web-based support and bug fixes or patches. The Company sells its customer support contracts at a percentage of list or net product price. Customer support revenue is recognized ratably over the term of the customer support agreement, which is typically one year.

The Company's professional services include consulting, technical support, resident engineer services, design services and installation services. Because control transfers over time, revenue is recognized based on progress toward completion of the performance obligation. The method to measure progress toward completion requires judgment and is based on the nature of the products or services to be provided. The Company generally uses the input method to measure progress for its contracts because it believes such method best depicts the transfer of assets to the customer, which occurs as the Company incurs costs for the contracts. However, in some instances, the Company uses the output method because it best depicts the transfer of asset to the customer. Under the cost-to-cost measure of progress, the progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. When the measure of progress is based upon expended labor, progress toward completion is measured as the ratio of labor time expended to date versus the total estimated labor time required to complete the performance obligation. Revenue is recorded proportionally as costs are incurred or as labor is expended. Costs to fulfill these obligations include internal labor as well as subcontractor costs.

Customer training includes courses offered by the Company. The related revenue is typically recognized as the training services are performed.

The Company's typical performance obligations include the following:

Performance Obligation	When Performance Obligation is Typically Satisfied	When Payment is Typically Due
Software and Product Revenue
Software licenses (perpetual or term)	Upon transfer of control; typically, when made available for download (point in time)	Generally, within 30 days of invoicing except for term licenses, which may be paid for over time
Software licenses (subscription)	Upon activation of hosted site (over time)	Generally, within 30 days of invoicing
Hardware	When control of the hardware passes to the customer; typically, upon delivery (point in time)	Generally, within 30 days of invoicing
Software upgrades	Upon transfer of control; typically, when made available for download (point in time)	Generally, within 30 days of invoicing
Customer Support Revenue
Customer support	Ratably over the course of the support contract (over time)	Generally, within 30 days of invoicing
Professional Services
Other professional services (excluding training services)	As work is performed (over time)	Generally, within 30 days of invoicing (upon completion of services)
Training	When the class is taught (point in time)	Generally, within 30 days of services being performed

Significant Judgments

The Company's contracts with customers often include promises to transfer multiple products and services to the customer. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment.

27

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Judgment is required to determine the standalone selling price ("SSP") for each distinct performance obligation. The Company typically has more than one SSP for individual products and services due to the stratification of those products and services by customers and circumstances. In these instances, the Company may use information such as the size of the customer and geographic region in determining the SSP.

Deferred Revenue

Deferred revenue is a contract liability representing amounts collected from or invoiced to customers in excess of revenue recognized. This results primarily from the billing of annual customer support agreements where the revenue is recognized over the term of the agreement. The value of deferred revenue will increase or decrease based on the timing of recognition of revenue.

Disaggregation of Revenue

The Company disaggregates its revenue from contracts with customers based on the nature of the products and services and the geographic regions in which each customer is domiciled. The Company's revenue for the three and six months ended June 30, 2021 and 2020 was disaggregated as follows:

Three months ended June 30, 2021	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	56,128	$	32,816	$	11,590	$	100,534
Europe, Middle East and Africa	31,309		20,739		7,741		59,789
Asia Pacific	19,045		10,837		3,868		33,750
Other	6,647		8,045		2,445		17,137
	$	113,129	$	72,437	$	25,644	$	211,210

Three months ended June 30, 2020	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	57,112	$	33,651	$	10,844	$	101,607
Europe, Middle East and Africa	35,801		19,512		4,772		60,085
Asia Pacific	21,854		7,023		3,956		32,833
Other	6,095		8,437		1,436		15,968
	$	120,862	$	68,623	$	21,008	$	210,493

Six months ended June 30, 2021	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	92,940	$	64,422	$	22,752	$	180,114
Europe, Middle East and Africa	59,517		40,394		14,651		114,562
Asia Pacific	44,627		20,585		9,671		74,883
Other	13,934		15,741		4,748		34,423
	$	211,018	$	141,142	$	51,822	$	403,982

28

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Six months ended June 30, 2020	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	93,477	$	65,117	$	21,410	$	180,004
Europe, Middle East and Africa	56,166		34,322		8,787		99,275
Asia Pacific	36,797		14,534		8,834		60,165
Other	10,321		15,718		2,992		29,031
	$	196,761	$	129,691	$	42,023	$	368,475

The Company's product revenue from indirect sales through its channel partner program and from its direct sales program for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Indirect sales through channel partner program	$	27,114	$	32,649	$	47,277	$	61,253
Direct sales	86,015		88,213		163,741		135,508
	$	113,129	$	120,862	$	211,018	$	196,761

The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Sales to enterprise customers	$	24,522	$	35,950	$	47,190	$	63,231
Sales to service provider customers	88,607		84,912		163,828		133,530
	$	113,129	$	120,862	$	211,018	$	196,761

The Company's product revenue and service revenue components by segment for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

29

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Product revenue
Cloud and Edge	$	64,361	$	72,310	$	114,513	$	126,520
IP Optical Networks	48,768		48,552		96,505		70,241
Total product revenue	$	113,129	$	120,862	$	211,018	$	196,761
Service revenue
Maintenance
Cloud and Edge	$	57,986	$	57,853	$	112,659	$	113,409
IP Optical Networks	14,451		10,770		28,483		16,282
Total maintenance revenue	72,437		68,623		141,142		129,691
Professional services
Cloud and Edge	19,074		16,744		39,671		35,009
IP Optical Networks	6,570		4,264		12,151		7,014
Total professional services revenue	25,644		21,008		51,822		42,023
Total service revenue	$	98,081	$	89,631	$	192,964	$	171,714

Revenue Contract Balances

The timing of revenue recognition, billings and cash collections results in billed accounts receivable; unbilled receivables, which are contract assets; and customer advances and deposits, which are contract liabilities, in the Company's condensed consolidated balance sheets. Amounts are billed as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals or upon achievement of contractual milestones. Completion of services and billing may occur subsequent to revenue recognition, resulting in contract assets. The Company may receive advances or deposits from its customers before revenue is recognized, resulting in contract liabilities that are classified as deferred revenue. These assets and liabilities are reported in the Company's condensed consolidated balance sheets on a contract-by-contract basis as of the end of each reporting period. Changes in the contract asset and liability balances during the six months ended June 30, 2021 were not materially impacted by any factors other than billing and revenue recognition. Nearly all of the Company's deferred revenue balance is related to services revenue, primarily customer support contracts. Unbilled receivables stem primarily from engagements where services have been performed; however, billing cannot occur until services are completed.

In some arrangements, the Company allows customers to pay for term-based software licenses and products over the term of the software license. The Company also sells SaaS-based software under subscription arrangements, with payment terms over the term of the SaaS agreement. Amounts recognized as revenue in excess of amounts billed are recorded as unbilled receivables. Unbilled receivables that are anticipated to be invoiced in the next twelve months are included in Accounts receivable on the Company's condensed consolidated balance sheets. The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the six months ended June 30, 2021 were as follows (in thousands):

	Accounts receivable		Unbilled accounts receivable		Deferred revenue (current)		Deferred revenue (long-term)
Balance at January 1, 2021	$	179,331	$	58,407	$	96,824	$	26,010
Increase (decrease), net	(16,223)		(1,648)		4,647		(3,974)
Balance at June 30, 2021	$	163,108	$	56,759	$	101,471	$	22,036

The Company recognized approximately $60 million of revenue in the six months ended June 30, 2021 that was recorded as deferred revenue at December 31, 2020 and approximately $69 million of revenue in the six months ended June 30, 2020 that was recorded as deferred revenue at December 31, 2019. Of the Company's deferred revenue reported as long-term in its condensed consolidated balance sheet at June 30, 2021, the Company expects that approximately $12 million will be

30

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

recognized as revenue in 2022, approximately $6 million will be recognized as revenue in 2023 and approximately $4 million will be recognized as revenue in 2024 and beyond.

All freight-related customer invoicing is recorded as revenue, while the shipping and handling costs that occur after control of the promised goods or services transfer to the customer are reported as fulfillment costs, a component of Cost of revenue - product in the Company's condensed consolidated statements of operations.

Deferred Commissions Cost

Sales commissions earned by the Company's employees are considered incremental and recoverable costs of obtaining a contract with a customer. Expense related to commission payments has been deferred on our condensed consolidated balance sheet and is being amortized over the expected life of the customer contract, which averages five years. The current and long-term portions of deferred commission expense are included as components of Other current assets and Other assets, respectively. At both June 30, 2021 and December 31, 2020, the Company had $4.1 million of deferred sales commissions capitalized.

(13) OPERATING SEGMENT INFORMATION

The Company has two reportable segments, which are intended to align with the manner in which the business is managed: Cloud and Edge, and IP Optical Networks.

The Cloud and Edge segment provides secure and reliable software and hardware products, solutions and services for enabling Voice over Internet Protocol ("VoIP") communications, Voice over Long-Term Evolution ("VoLTE") and Voice Over 5G ("VoNR") communications and Unified Communications and Collaboration ("UC&C") within service provider and enterprise networks and from the cloud. The Cloud and Edge products are increasingly software-centric and cloud-native for deployment on private, public or hybrid cloud infrastructures, in data centers, on enterprise premises and within service provider networks. Ribbon's Cloud and Edge product portfolio consists of our Session Border Controller ("SBC") products and our Network Transformation ("NTR") products.

The IP Optical Networks segment provides high-performance, secure and reliable hardware and software products solutions for IP networking, switching, routing and optical transport designed to support and enable technologies like 5G, distributed cloud computing and corresponding applications by delivering ultra-low cost-per-bit transport and multi-service flexibility. The IP Optical Networks portfolio offers multiple solutions, including 5G-native solutions for mobile backhaul, metro and edge aggregation, core networking, data center interconnect, legacy NTR and transport solutions for wholesale carriers. This portfolio is offered to service provider, enterprise and industry verticals with critical transport network infrastructures including utilities, government, defense, transportation, and education and research Information for the IP Optical Networks segment for the six months ended June 30, 2020 includes the financial results of this segment for the period subsequent to the ECI Acquisition Date.

The Company has not provided segment asset information as such information is not provided to the CODM and accordingly, asset information is not used in assessing segment performance. Please see Note 6 for information regarding the allocation of goodwill between segments. Segment revenue and expenses included in the tables below represent direct revenue and expenses attributable to each segment for revenue, adjusted gross profit, and the research and development expense component of adjusted EBITDA. The Company's sales, marketing, and general and administrative functions support both segments and accordingly, these costs are allocated to both segments.

The CODM utilizes revenue, adjusted gross profit and adjusted EBITDA (earnings before interest, taxes, depreciation and amortization) to measure and assess each segment's performance. The Company calculates adjusted EBITDA by excluding from income (loss) from operations: depreciation; amortization of acquired intangible assets; stock-based compensation; certain litigation costs; acquisition-, disposal- and integration-related expense; and restructuring and related expense. These adjusted measures may also exclude other items in future periods that the Company believes are not part of the Company's core business. Adjusted gross profit and adjusted EBITDA are not financial measures determined in accordance with U.S. GAAP and may not be comparable to similarly titled measures used by other companies and should not be considered a substitute for income (loss)

31

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

from operations or gross profit or other results reported in accordance with U.S. GAAP. See below for a reconciliation of adjusted gross profit to gross profit and adjusted EBITDA to income (loss) from operations, as those are the most directly comparable U.S. GAAP measures.

The tables below provide information regarding revenue, adjusted gross profit, adjusted EBITDA and depreciation expense by reportable segment for the three and six months ended June 30, 2021 and 2020 (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment revenue:
Cloud and Edge	$	141,421	$	146,907	$	266,843	$	274,938
IP Optical Networks	69,789		63,586		137,139		93,537
Revenue	$	211,210	$	210,493	$	403,982	$	368,475

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment adjusted gross profit:
Cloud and Edge	$	95,837	$	98,779	$	180,172	$	177,714
IP Optical Networks	33,152		24,686		59,626		36,432
Total segment adjusted gross profit	128,989		123,465		239,798		214,146
Stock-based compensation expense	(562)		(198)		(824)		(355)
Gross profit	$	128,427	$	123,267	$	238,974	$	213,791

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment adjusted EBITDA:
Cloud and Edge	$	43,536	$	37,497	$	71,866	$	47,236
IP Optical Networks	(482)		(7,947)		(9,160)		(8,145)
Total segment adjusted EBITDA	43,054		29,550		62,706		39,091
Depreciation	(4,249)		(4,786)		(8,475)		(8,260)
Amortization of intangible assets	(17,181)		(14,669)		(33,004)		(29,003)
Stock-based compensation	(4,790)		(3,222)		(9,850)		(6,198)
Litigation costs	—		937		—		(2,101)
Acquisition-, disposal- and integration-related expense	(1,052)		(857)		(2,249)		(13,241)
Restructuring and related expense	(2,830)		(5,361)		(8,780)		(7,436)
Income (loss) from operations	12,952		1,592		$	348	$	(27,148)
Segment depreciation expense:
Cloud and Edge	$	3,142	$	2,984	$	6,279	$	5,977
IP Optical Networks	1,107		1,802		2,196		2,283
Depreciation expense	$	4,249	$	4,786	$	8,475	$	8,260

32

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

(14) MAJOR CUSTOMERS

The following customer contributed 10% or more of the Company's revenue in the three and six months ended June 30, 2021 and 2020:

	Three months ended		Six months ended
	June 30, 2021	June 30, 2020	June 30, 2021	June 30, 2020
Verizon Communications Inc.	17%	15%	16%	14%

At June 30, 2021, one customer accounted for 10% or more of the Company's accounts receivable balance, representing approximately 17% of total accounts receivable. At December 31, 2020, one customer accounted for 10% or more of the Company's accounts receivable balance, representing approximately 12% of total accounts receivable. The Company performs ongoing credit evaluations of its customers and generally does not require collateral on accounts receivable, although in some instances the Company may require letters of credit to support customer outstanding accounts receivable balances. The Company maintains an allowance for doubtful accounts and such losses have been within management's expectations.

(15) COMMON STOCK REPURCHASES

In the second quarter of 2019, the Company's Board of Directors (the "Board") approved a stock repurchase program (the "Repurchase Program") pursuant to which the Company could repurchase up to $75 million of its common stock prior to April 18, 2021. The Company did not repurchase any common stock during the three and six months ended June 30, 2021 or 2020. The Repurchase Program expired on April 18, 2021. At December 31, 2020, the Company had $70.5 million remaining under the Repurchase Program for future repurchases.

(16) STOCK-BASED COMPENSATION PLANS

2019 Stock Incentive Plan

The Company's Amended and Restated 2019 Incentive Award Plan (the "2019 Plan") provides for the award of options to purchase the Company's common stock ("stock options"), stock appreciation rights ("SARs"), restricted stock awards ("RSAs"), performance-based stock awards ("PSAs"), restricted stock units ("RSUs"), performance-based stock units ("PSUs") and other stock- or cash-based awards. Awards can be granted under the 2019 Plan to the Company's employees, officers and non-employee directors, as well as consultants and advisors of the Company and its subsidiaries.

2007 Plan

The Company's 2007 Plan provided for the award of stock options, SARs, RSAs, PSAs, RSUs, PSUs and other stock-based awards to employees, officers, non-employee directors, consultants and advisors of the Company and its subsidiaries. On and following June 5, 2019, with the exception of shares underlying awards outstanding as of that date, no additional shares may be granted under the 2007 Plan.

Assumed Stock Plans

In connection with the acquisition of Edgewater Networks, Inc. in August 2018, the Company assumed Edgewater's Amended and Restated 2002 Stock Option Plan (the "Edgewater Plan") to the extent of the shares underlying the options outstanding under the Edgewater Plan as of the Edgewater Acquisition Date (the "Edgewater Options"). The Edgewater Options were converted to Ribbon stock options (the "Ribbon Replacement Options") which are vesting under the same schedules as the respective Edgewater Options.

In connection with the Company's acquisitions of Performance Technologies Inc. ("PT") in 2014, and Network Equipment

33

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Technologies, Inc. ("NET") in 2012, the Company assumed their stock plans (collectively, the "Assumed Plans"). Any outstanding awards under the Assumed Plans that in the future expire, terminate, are cancelled or surrendered, or are repurchased by the Company will be returned to the 2019 Plan. Accordingly, no additional shares may be granted under the Assumed Plans.

Executive Equity Arrangements

Inducement Awards

In connection with his appointment as President and Chief Executive Office of Ribbon, and as an inducement for Bruce McClelland's ("Mr. McClelland") commencement of employment, the Company awarded Mr. McClelland sign-on equity grants, comprised of 462,963 RSUs and a PSU grant with both market and service conditions (the "Inducement PSUs") on March 16, 2020. The RSUs vested and were released to Mr. McClelland on March 16, 2021. Subject to Mr. McClelland's continued employment, the Inducement PSUs are eligible to vest and be settled in up to 4,750,000 shares of Ribbon common stock upon the achievement of specified share price thresholds on or prior to September 1, 2024. The first share price threshold for Mr. McClelland’s Inducement PSUs was achieved on February 26, 2021, and accordingly 1,333,333 shares were released to him. These releases are included in the applicable tables below.

Performance-Based Stock Grants

In addition to granting RSUs to its executives and certain of its employees, the Company also grants PSUs to certain of its executives, including the Inducement PSUs granted to Mr. McClelland as described above.

In 2021, 2020 and 2019, the Company granted certain of its executives (the "2021 PSUs", "2020 PSUs" and "2019 PSUs", respectively), of which 60% of each executive's PSU grant had both performance and service conditions (the "Performance PSUs") and 40% had both market and service conditions (the "Market PSUs").

Each executive's Performance PSU grant is comprised of three consecutive fiscal year performance periods beginning in the year of grant (each, a "Fiscal Year Performance Period"), with one-third of the Performance PSUs attributable to each Fiscal Year Performance Period. The number of shares that will be vest for each Fiscal Year Performance Period, if any, will be based on the achievement of certain metrics related to the Company's financial performance for the applicable year on a standalone basis (each, a "Fiscal Year Performance Condition"). The Company's achievement of the goals for each Fiscal Year Performance Condition (and the number of shares of Company common stock to vest as a result thereof) are being measured on a linear sliding scale in relation to specific threshold, target and stretch performance conditions, with any shares earned vesting in the first quarter of the fiscal year following the third Performance Period of the grant, pending each executive's continued employment with the Company through that date. The number of shares of common stock underlying the Performance PSUs that can be earned will in no event exceed 200% of the Performance PSUs. Shares subject to the Performance PSUs that fail to be earned will be forfeited.

The Market PSUs have one three-year performance period, beginning January 1 in the year of grant and ending on December 31, three years thereafter (the "Market Performance Period"). The number of shares subject to the Market PSUs that will vest, if any, will be dependent upon the Company's total shareholder return ("TSR") compared with the TSR of the companies included in a custom index for the applicable Market Performance Period, measured by the Compensation Committee after the Market Performance Period ends, with any shares earned vesting in the first quarter of the fiscal year following the respective Market Performance Period, pending each executive's continued employment with the Company through that date. The number of shares of common stock underlying the Market PSUs that can be earned will in no event exceed 200% of the Market PSUs. Shares subject to the Market PSUs that fail to be earned will be forfeited.

In addition, in connection with his appointment as Executive Vice President and General Manager, Packet Optical Networking, the Company granted Sam Bucci 133,333 PSUs (the "Bucci Stock Price PSUs") with both market and service conditions. Subject to Mr. Bucci's continued employment, the Bucci Stock Price PSUs were eligible to vest and be settled in shares of Ribbon's common stock upon the achievement of a specific share price threshold on or prior to January 31, 2022. The share price threshold for Mr. Bucci’s Stock Price PSUs was achieved on February 12, 2021, and the shares were released to him. This release is included in the applicable table below.

34

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Accounting for Performance PSUs. Once the grant date criteria have been met for a Fiscal Year Performance Period, the Company records stock-based compensation expense for the respective underlying Performance PSUs based on its assessment of the probability that each performance condition will be achieved and the level, if any, of such achievement. The Compensation Committee determines the number of shares earned, if any, after the Company's financial results for each Fiscal Year Performance Period are finalized. Upon the determination by the Compensation Committee of the number of shares that will be received upon vesting of the Performance PSUs, such number of shares becomes fixed and the unamortized expense is recorded through the remainder of the service period, generally three years from the date of grant, at which time the total Performance PSUs earned, if any, will vest, pending each executive's continued employment with the Company through that date.

Accounting for Market PSUs. PSUs that include a market condition require the use of a Monte Carlo simulation approach to model future stock price movements based upon the risk-free rate of return, the date of return, the volatility of each entity and the pair-wise covariance between each entity. These results are then used to calculate the grant date fair values of the respective PSUs. The Company is required to record expense for the PSUs with market conditions through their respective final vesting dates, regardless of the number of shares that are ultimately earned.

At March 31, 2021, the calculation of the grant date fair value of the Market PSUs granted on March 15, 2021 had not been completed. The Company used a grant date fair value of $8.65, the closing stock price on the date of grant, to calculate expense attributable to the three months ended March 31, 2021 for these Market PSUs. During the three months ended June 30, 2021, the Company completed the Monte Carlo valuation of these Market PSUs and calculated that the grant date fair value of each Market PSU was $13.67. The Company recorded a cumulative adjustment to expense to account for the change in grant date fair value in the second quarter of 2021. The change in grant date fair value and related cumulative adjustment did not have a material impact on its consolidated financial statements.

Employee Bonus Program

Effective in 2021, the Company added an equity component to its cash bonus program for eligible employees, under which RSUs with a grant date fair value equal to 50% of each employee's target cash bonus were granted to each such employee (the "Bonus RSUs"). Correspondingly, cash target bonuses for eligible employees were reduced by 50%. The Company implemented this program to expand the opportunities for stock ownership more broadly throughout the Company. The Bonus RSU grants are included in the applicable table below.

Stock Options

The activity related to the Company's outstanding stock options for the six months ended June 30, 2021 was as follows:

	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	207,710	$	12.69
Exercised	(13,602)	$	1.76
Expired	(3,386)	$	17.04
Outstanding at June 30, 2021	190,722	$	13.40	3.11	$	240
Vested or expected to vest at June 30, 2021	190,709	$	13.40	3.11	$	240
Exercisable at June 30, 2021	189,978	$	13.44	3.10	$	236

The total intrinsic value of options exercised was nominal in the three months ended June 30, 2021 and $0.1 million in the six months ended June 30, 2021. The Company received nominal cash from option exercises in the three months ended June 30, 2021 and approximately $24,000 in the six months ended June 30, 2021.

35

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

Restricted Stock Awards and Units

The activity related to the Company's RSAs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	86,983	$	7.04
Vested	(86,983)	$	7.04
Unvested balance at June 30, 2021	—	$	—

The activity related to the Company's RSUs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	6,531,110	$	3.32
Granted	3,087,947	$	8.57
Vested	(2,378,221)	$	3.19
Forfeited	(458,054)	$	4.18
Unvested balance at June 30, 2021	6,782,782	$	5.70

The total grant date fair value of shares of restricted stock granted under RSAs and RSUs that vested during the six months ended June 30, 2021 was $8.2 million.

Performance-Based Stock Units

The activity related to the Company's PSUs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	6,035,931	$	1.56
Granted	672,121	$	10.22
Vested	(1,525,681)	$	0.98
Forfeited	(91,005)	$	4.29
Unvested balance at June 30, 2021	5,091,366	$	2.99

The total grant date fair value of shares of restricted stock granted under PSUs that vested during the six months ended June 30, 2021 was $1.5 million.

Stock-Based Compensation

The condensed consolidated statements of operations include stock-based compensation for the three and six months ended June 30, 2021 and 2020 as follows (in thousands):

36

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Product cost of revenue	$	93	$	39	$	120	$	66
Service cost of revenue	469		159		704		289
Research and development	1,160		738		1,787		1,296
Sales and marketing	1,752		1,011		3,626		1,763
General and administrative	1,316		1,275		3,613		2,784
	$	4,790	$	3,222	$	9,850	$	6,198

There was an income tax benefit of $1.3 million for stock-based compensation in the six months ended June 30, 2021; however, there was no income tax benefit in the six months ended June 30, 2020 due to the valuation allowance recorded.

At June 30, 2021, there was $34.6 million, net of expected forfeitures, of unrecognized stock-based compensation expense related to unvested stock options, stock awards and stock units. This expense is expected to be recognized over a weighted average period of approximately two years.

(17) LEASES

The Company has operating and finance leases for corporate offices, research and development facilities, and certain equipment. Operating leases are reported separately in the Company's condensed consolidated balance sheets. Assets acquired under finance leases are included in Property and equipment, net, in the condensed consolidated balance sheets.

The Company determines if an arrangement is a lease at inception. A contract is determined to contain a lease component if the arrangement provides the Company with a right to control the use of an identified asset. Lease agreements may include lease and non-lease components. In such instances for all classes of underlying assets, the Company does not separate lease and non-lease components but rather, accounts for the entire arrangement under leasing guidance. Leases with an initial term of 12 months or less are not recorded on the balance sheet and lease expense for these leases is recognized on a straight-line basis over the lease term.

Right-of-use assets and lease liabilities are initially measured based on the present value of the future minimum fixed lease payments (i.e., fixed payments in the lease contract) over the lease term at the commencement date. As the Company's existing leases do not have a readily determinable implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of future minimum fixed lease payments. The Company calculates its incremental borrowing rate to reflect the interest rate that it would have to pay to borrow on a collateralized basis an amount equal to the lease payments in a similar economic environment over a similar term and considers its historical borrowing activities and market data from entities with comparable credit ratings in this determination. The measurement of the right-of-use asset also includes any lease payments made prior to the commencement date (excluding any lease incentives) and initial direct costs incurred. The Company assessed its right-of-use assets for impairment as of June 30, 2021 and December 31, 2020 and determined no impairment has occurred.

Lease terms may include options to extend or terminate the lease and the Company incorporates such options in the lease term when it has the unilateral right to make such an election and it is reasonably certain that the Company will exercise that option. In making this determination, the Company considers its prior renewal and termination history and planned usage of the assets under lease, incorporating expected market conditions.

For operating leases, lease expense for minimum fixed lease payments is recognized on a straight-line basis over the lease term. The expense for finance leases includes both interest and amortization expense components, with the interest component calculated based on the effective interest method and the amortization component calculated based on straight-line amortization of the right-of-use asset over the lease term. Lease contracts may contain variable lease costs, such as common area maintenance, utilities and tax reimbursements that vary over the term of the contract. Variable lease costs are not included in minimum fixed lease payments and as a result, are excluded from the measurement of the right-of-use assets and lease

37

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

liabilities. The Company expenses all variable lease costs as incurred.

In connection with the 2019 Restructuring Initiative, certain lease assets related to facilities are being partially or fully vacated as the Company consolidates its facilities. The Company has no plans to enter into sublease agreements for certain facilities. The Company ceased use of these facilities in the first quarter of 2021, the first and fourth quarters of 2020 and the third quarter of 2019. Accordingly, the Company accelerated the amortization of the associated lease assets through the planned cease-use date of each facility, resulting in additional amortization expense of $3.4 million and $0.1 million in the six months ended June 30, 2021 and 2020, respectively. The Company also recorded expense of $1.4 million in the aggregate in the six months ended June 30, 2021 for all estimated future variable lease costs related to these facilities. The Company recorded a nominal credit for all estimated future variable lease costs in the six months ended June 30, 2020. The Company did not record additional amortization expense or estimated future variable lease costs in the three months ended June 30, 2021 or 2020.

All accelerated amortization and accrual of future variable costs were recorded as Restructuring and related expense in the Company's condensed consolidated statements of operations. At June 30, 2021 and December 31, 2020, the Company had accruals of $1.9 million and $0.8 million, respectively, for all future anticipated variable lease costs related to these facilities. The Company may incur additional future expense if it is unable to sublease other locations included in the Facilities Initiative.

The Company leases its corporate offices and other facilities under operating leases, which expire at various times through 2032. In December 2020, the Company began relocating from its former leased Plano, Texas facility to its recently completed leased facility, also located in Plano, Texas, which became the Company's corporate headquarters. The Company's relocation to the new corporate headquarters was completed in the first quarter of 2021.

The Company's right-of-use lease assets and lease liabilities at June 30, 2021 and December 31, 2020 were as follows (in thousands):

	Classification	June 30, 2021		December 31, 2020
Assets:
Operating lease assets	Operating lease right-of-use assets	$	57,869	$	69,757
Finance lease assets*	Property and equipment, net	574		983
Total leased assets		$	58,443	$	70,740
Liabilities:
Current:
Operating	Operating lease liabilities	$	17,974	$	17,023
Finance	Accrued expenses and other	709		902
Noncurrent:
Operating	Operating lease liabilities, net of current	62,615		72,614
Finance	Other long-term liabilities	253		568
Total lease liabilities		$	81,551	$	91,107

* Finance lease assets were recorded net of accumulated depreciation of $2.3 million and $1.9 million at June 30, 2021 and December 31, 2020, respectively.

The components of lease expense for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

38

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Operating lease cost*	$	5,194	$	5,217	$	14,031	$	8,561
Finance lease cost:
Amortization of leased assets	180		319		409		638
Interest on lease liabilities	20		47		46		102
Short-term lease cost	3,270		5,629		6,562		11,124
Variable lease costs (costs excluded from minimum fixed lease payments)**	500		635		2,658		1,272
Sublease income	(199)		(320)		(475)		(564)
Net lease cost	$	8,965	$	11,527	$	23,231	$	21,133

* Operating lease costs for the six months ended June 30, 2021 included $3.4 million of accelerated amortization for certain assets partially or fully vacated in 2021 with no intent or ability to sublease. Operating lease costs for the six months ended June 30, 2020 included $0.1 million of accelerated amortization for certain assets partially or fully vacated in 2020 with no ability to sublease. The Company did not record accelerated amortization in the three months ended June 30, 2021 or 2020.

** Variable lease costs for the six months ended June 30, 2021 included accruals of $1.4 million for all future estimated variable expenses related to certain assets partially or fully vacated in 2021 with no intent or ability to sublease. No such variable costs were accrued in the three months ended June 30, 2021 or in the three and six months ended June 30, 2020.

Cash flow information related to the Company's leases for the six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Six months ended
	June 30, 2021		June 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	10,997	$	7,844
Operating cash flows for finance leases	$	46	$	102
Financing cash flows for finance leases	$	507	$	668

Other information related to the Company's leases as of June 30, 2021 and December 31, 2020 was as follows:

	June 30, 2021		December 31, 2020
Weighted average remaining lease term (years):
Operating leases	6.49		6.59
Finance leases	1.35		1.70
Weighted average discount rate:
Operating leases	5.71	%	5.67	%
Finance leases	5.09	%	6.15	%

Future minimum fixed lease payments under noncancelable leases at June 30, 2021 were as follows (in thousands):

39

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

	June 30, 2021
	Operating		Finance
	leases		leases
Remainder of 2021	$	11,326	$	422
2022	20,323		511
2023	17,530		63
2024	9,704		—
2025	7,791		—
2026 and beyond	31,353		—
Total lease payments	98,027		996
Less: interest	(17,438)		(35)
Present value of lease liabilities	$	80,589	$	961

(18) INCOME TAXES

The Company's income tax provisions for the six months ended June 30, 2021 and 2020 reflect the Company's estimates of the effective rates expected to be applicable for the respective full years, adjusted for any discrete events, which are recorded in the period that they occur. These estimates are reevaluated each quarter based on the Company's estimated tax expense for the full year. The estimated effective tax rate includes the impact of valuation allowances in various jurisdictions.

The Company intends to continue to maintain a full valuation allowance on its deferred tax assets until there is sufficient evidence to support the reversal of all or some portion of the allowance. However, given its current earnings and anticipated future earnings, the Company believes there is a reasonable possibility that within the next 12 months, sufficient positive evidence may become available to reach a conclusion that a significant portion of the U.S. valuation allowance will no longer be needed. Release of the valuation allowance would result in the recognition of certain deferred tax assets and a decrease in income tax expense for the period in which the release is recorded. However, the exact timing and amount, of the valuation allowance release, if any, are subject to change on the basis of the level of profitability that the Company is able to actually achieve.

(19) COMMITMENTS AND CONTINGENCIES

Liabilities for Royalty Payments to the IIA. Prior to the ECI Acquisition, ECI had received research and development grants from the Office of the Innovation Authority of the Israeli Ministry of Economics (the "IIA"). The Company assumed ECI's contract with the IIA, which requires the Company to pay royalties to the IIA on proceeds from the sale of products which the Israeli government has supported by way of research and development grants. The royalties for grants prior to 2017 were calculated at the rates of 1.3% to 5.0% of the aggregated proceeds from the sale of such products developed at certain of the Company's R&D centers, up to an amount not exceeding 100% of such grants plus interest at LIBOR. Effective for grants approved in 2017 and subsequently, interest was calculated at the higher of LIBOR plus 1.5% to 2.75%. At June 30, 2021, the Company's maximum possible future royalties commitment, including $3.9 million of unpaid royalties accrued, was $36.8 million, including interest of $1.9 million, based on estimates of future product sales, grants received from the IIA not yet repaid, and management's estimation of products still to be sold.

Research and Development Grants. The Company records grants received from the IIA as a reduction to research and development expense. Royalties payable to the IIA are recognized pursuant to sales of related products and are classified as Cost of revenue. The Company does not anticipate receiving material grants from the IIA in the foreseeable future.

Litigation. On November 8, 2018, Ron Miller, a purported stockholder of the Company, filed a Class Action Complaint (the "Miller Complaint") in the United States District Court for the District of Massachusetts (the "Massachusetts District Court") against the Company and three of its former officers (collectively, the "Defendants"), claiming to represent a class of purchasers of Sonus common stock during the period from January 8, 2015 through March 24, 2015 and alleging violations of the federal securities laws. Similar to a previous complaint entitled Sousa et al. vs. Sonus Networks, Inc. et al., which was

40

RIBBON COMMUNICATIONS INC.

Notes to Condensed Consolidated Financial Statements (Continued)

(unaudited)

dismissed with prejudice by an order dated June 6, 2017, the Miller Complaint claims that the Defendants made misleading forward-looking statements concerning Sonus' expected fiscal first quarter of 2015 financial performance, which statements were also the subject of an August 7, 2018 Securities and Exchange Commission Cease and Desist Order, whose findings the Company neither admitted nor denied. The Miller plaintiffs are seeking monetary damages.

After the Miller Complaint was filed, several parties filed and briefed motions seeking to be selected by the Massachusetts District Court to serve as a Lead Plaintiff in the action. On June 21, 2019, the Massachusetts District Court appointed a group as Lead Plaintiffs and the Lead Plaintiffs filed an amended complaint on July 19, 2019. On August 30, 2019, the Defendants filed a motion to dismiss the Miller Complaint and, on October 4, 2019, the Lead Plaintiffs filed an opposition to the motion to dismiss. There was an oral argument on the motion to dismiss on February 12, 2020.

In addition, the Company is often a party to disputes and legal proceedings that it considers routine and incidental to its business. Management does not expect the results of any of these actions to have a material effect on the Company's business or condensed consolidated financial statements.

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Item 2.    Management's Discussion and Analysis of Financial Condition and Results of Operations

The following discussion of the financial condition and results of operations of Ribbon Communications Inc. should be read in conjunction with the condensed consolidated financial statements and the related notes thereto included elsewhere in this Quarterly Report on Form 10-Q and the audited financial statements and notes thereto and Management's Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2020, which was filed with the U.S. Securities and Exchange Commission on February 26, 2021.

Overview

We are a leading global provider of communications technology to service providers and enterprises. We provide a broad range of software and high-performance hardware products, solutions and services that enable the secure delivery of data and voice communications for residential consumers and for small, medium and large enterprises and industry verticals such as finance, education, government, utilities and transportation. Our mission is to create a recognized global technology leader providing increasingly cloud-centric solutions that enable the secure exchange of information, with unparalleled scale, performance and elasticity. Headquartered in Plano, Texas, we have a global presence with research and development and/or sales and support locations in over thirty-five countries around the world.

Impact of COVID-19 on Our Business

In 2020, a novel strain of the coronavirus (COVID-19) was declared by the World Health Organization to be a global pandemic. The COVID-19 pandemic has had a negative effect on the global economy, disrupting the various manufacturing, commodity and financial markets and increasing volatility, and has impeded global supply chains, including that of our IP Optical Networks operating segment. Continued dampened global economic conditions as a result of the COVID-19 pandemic, especially in areas where a vaccine rollout is slower, such as Australia and India, may cause our customers to restrict spending or delay purchases for an indeterminate period of time and consequently cause our revenues to decline. In addition, our ability to deliver our solutions as agreed upon with our customers depends on the ability of our global contract manufacturers, vendors, licensors and other business partners to deliver products or perform services we have procured from them. While, to date, we have not experienced material issues, if the ongoing COVID-19 pandemic impairs the ability of our business partners to support us on a timely basis, or negatively impacts the demand for our customers' other products and services, our ability to perform our customer contracts as well as the demand for our solutions may suffer. In addition, disruptions from the COVID-19 pandemic could include, and with respect to our IP Optical Networks operating segment have included, disruption of logistics necessary to import, export and deliver our solutions. The COVID-19 pandemic continues to limit in some locations, including India, the ability of our employees to perform their work due to illness caused by the pandemic or local, state or federal orders requiring employees to remain at home. The degree to which the COVID-19 pandemic ultimately impacts our business, financial position and results of operations will depend on future developments beyond our control, including the effectiveness and timing of any vaccines, the frequency and duration of future waves of infection, the effectiveness and timing of any vaccines, the extent of actions to contain or treat the virus, how quickly and to what extent normal economic and operating conditions can resume, and the severity and duration of the global economic downturn that results from the pandemic.

As a response to the ongoing COVID-19 pandemic, we have continued to implement plans to manage our costs. We have significantly reduced travel, marketing and other discretionary expenses except where necessary to meet customer or regulatory needs and acted to limit discretionary spending. To the extent the business disruption continues for an extended period, additional cost management actions will be considered. Any future asset impairment charges, increases in the allowance for doubtful accounts or restructuring charges could be more likely and will be dependent on the severity and duration of this crisis.

Reclassification of Amortization of Acquired Intangible Assets

In 2020, we reclassified amounts recorded for amortization of acquired intangible assets in prior presentations from Cost of revenue - product and Sales and marketing to a separate line included in operating expenses in our consolidated statements of operations. Our management believes this presentation enhances the comparability of our financial statements to industry peers. These reclassifications did not impact our operating income (loss), net income (loss) or earnings (loss) per share for any historical periods. These reclassifications also did not impact our consolidated balance sheets or consolidated statements of cash flows.

This reclassification resulted in reductions in the three and six months ended June 30, 2020 to Cost of revenue - product of $10.9 million and $19.9 million, respectively, and reductions to Sales and marketing of $3.7 million and $9.1 million, respectively, which amounts were reclassified to Amortization of acquired intangible assets. The reduction to Cost of revenue -

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product in the three months ended June 30, 2020 increased our product gross profit as a percentage of product revenue ("product gross margin") and our total gross profit as a percentage of revenue ("total gross margin) by approximately nine percentage points and five percentage points, respectively. The reduction to Cost of revenue - product in the six months ended June 30, 2020 increased our product gross margin and total gross margin by approximately ten percentage points and five percentage points, respectively.

Acquisition of ECI Telecom Group Ltd.

On March 3, 2020 (the "ECI Acquisition Date"), we completed the acquisition of ECI in accordance with the terms of the Agreement and Plan of Merger, dated as of November 14, 2019, by and among Ribbon, an indirect wholly-owned subsidiary of Ribbon ("Merger Sub"), Ribbon Communications Israel Ltd., ECI, and ECI Holding (Hungary) kft, pursuant to which Merger Sub merged with and into ECI, with ECI surviving such merger as a wholly-owned subsidiary of Ribbon (the "ECI Acquisition"). Prior to the ECI Acquisition Date, ECI was a privately-held global provider of end-to-end packet-optical transport and software-defined networking ("SDN") and network function virtualization ("NFV") solutions for service providers, enterprises and data center operators. Ribbon believes the ECI Acquisition positions the Company for growth and enhances its competitive strengths by expanding its product portfolio beyond solutions primarily supporting voice applications to include data applications and optical networking.

As consideration for the ECI Acquisition, we issued the ECI shareholders and certain others 32.5 million shares of Ribbon common stock with a fair value of $108.6 million (the "Stock Consideration") and paid $322.5 million of cash, comprised of $183.3 million to repay ECI's outstanding debt, including both principal and interest, and $139.2 million paid to ECI's selling shareholders (the "Cash Consideration"). In addition, ECI shareholders received $33.4 million from the sale of certain of ECI's real estate assets. Cash Consideration was financed through cash on hand and committed debt financing consisting of a new $400 million term loan facility and new $100 million revolving credit facility, which was undrawn at the ECI Acquisition Date. The ECI Acquisition has been accounted for as a business combination and the financial results of ECI have been included in our consolidated financial statements for the periods subsequent to the ECI Acquisition Date.

Sale of Kandy Communications Business

On December 1, 2020 (the "Kandy Sale Date"), we completed the sale of our Kandy Communications Business to American Virtual Cloud Technologies, Inc. ("AVCT"). AVCT purchased the assets and assumed certain liabilities associated with the Kandy Communications Business, as well as all of the outstanding interests in Kandy Communications LLC, a subsidiary of the Company (the "Kandy Sale"). The assets acquired and liabilities assumed by AVCT in connection with the Kandy Sale were primarily comprised of accounts receivable, property and equipment, trade accounts payable and employee-related accruals.

As consideration, AVCT paid us $45.0 million, subject to certain adjustments, in the form of units of AVCT's securities (the "AVCT Units"), with each AVCT Unit consisting of: $1,000 in principal amount of AVCT’s Series A-1 convertible debentures (the “Debentures”); and (ii) one warrant to purchase 100 shares of AVCT common stock, $0.0001 par value (the “Warrants”), as consideration for the Kandy Sale. We received 43,778 AVCT Units as consideration on the Kandy Sale Date.

The Debentures bear interest at a rate of 10% per annum, which is being added to the principal amount of the Debentures, except upon maturity, in which case accrued and unpaid interest is payable in cash. The entire principal of each Debenture, together with accrued and unpaid interest thereon, is due and payable on the earlier of the May 1, 2023 maturity date or the occurrence of a Change in Control as defined in the definitive purchase agreement, as amended (the "Amended Kandy Agreement"). Each Debenture is convertible, in whole or in part, at any time at our option into that number of shares of AVCT common stock, calculated by dividing the principal amount being converted, together with all accrued and unpaid interest thereon, by the applicable conversion price, initially $3.45. The Debentures are subject to mandatory redemption if the AVCT stock price is at or above $6.00 per share for 40 trading days in any 60 consecutive trading day period, subject to the satisfaction of certain other conditions. The conversion price is subject to customary adjustments including, but not limited to, stock dividends, stock splits and reclassifications. At the Company's option, up to $5.0 million of the Debentures may be redeemed by AVCT at par in the event AVCT raises at least $50.0 million in its offering of AVCT Units. As of February 19, 2021, the stock price had traded above $6.00 for 40 days within a 60 consecutive trading day period, and accordingly, the Debentures will be converted to shares of AVCT common stock upon the completion of customary regulatory filings by AVCT. Upon the expiration of the lock-up period, we began to value the Debentures at each measurement date by multiplying the closing stock price of AVCT common stock by the number of shares upon conversion of the Debentures.

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The Warrants are independent of the Debentures and entitle us to purchase 4,377,800 shares of AVCT common stock at an exercise price of $0.01 per share. The Warrants expire on December 1, 2025, and were immediately exercisable on the Kandy Sale Date.

We had not redeemed any of the Debentures or exercised any of the Warrants as of June 30, 2021. We were also subject to a lock-up provision which limited our ability to sell any shares of AVCT common stock underlying the Debentures and the Warrants prior to June 1, 2021, except in certain transactions.

We determined that the AVCT Units had a fair value of $84.9 million at the Kandy Sale Date, comprised of the Debentures with a fair value of $66.3 million and the Warrants with a fair value of $18.6 million. The value of the net assets sold to AVCT totaled $1.3 million, resulting in a gain on the sale of $83.6 million.

We are calculating the fair value of the Debentures and Warrants at each quarter-end and recording any adjustments to the fair values in Other income (expense), net. At June 30, 2021 and December 31, 2020, the aggregate fair value of the Debentures and Warrants was $106.0 million and $115.2 million, respectively. We recorded a gain of $12.1 million in the three months ended June 30, 2021and a loss of $11.8 million in the six months ended June 30, 2021 arising from the change in the fair value of the Debentures and Warrants, and which is included as a component of Other income (expense), net, in our condensed consolidated statements of operations. We recorded $1.2 million and $2.7 million of interest income in the three and six months ended June 30, 2021, respectively, which was added to the principal of the Debentures, and which is included in Interest expense, net, in our condensed consolidated statements of operations. The fair values of the Debentures and Warrants are reported as Investments in our condensed consolidated balance sheets at June 30, 2021 and December 31, 2020.

Operating Segments

Effective in the fourth quarter of 2020 and in connection with the ECI Acquisition, our CODM began to assess our performance based on the performance of two separate organizations within Ribbon: the Cloud and Edge operating segment ("Cloud and Edge") and the IP Optical Networks operating segment ("IP Optical Networks"). Amounts attributable to IP Optical Networks in the six months ended June 30, 2020 are for the period subsequent to the ECI Acquisition Date. For additional details regarding our operating segments, see Note 13 - Operating Segment Information to our condensed consolidated financial statements.

Financial Overview

Financial Results

We reported income from operations of $13.0 million and $1.6 million for the three months ended June 30, 2021 and 2020, respectively. We reported income from operations of $0.3 million for the six months ended June 30, 2021 and a loss from operations of $27.1 million for the six months ended June 30, 2020.

Our revenue was $211.2 million and $210.5 million in the three months ended June 30, 2021 and 2020, respectively. Our total gross profit and total gross margin were $128.4 million and 60.8%, respectively, in the three months ended June 30, 2021, and $123.3 million and 58.6%, respectively, in the three months ended June 30, 2020. Our revenue was $404.0 million and $368.5 million in the six months ended June 30, 2021 and 2020, respectively. Our total gross profit and total gross margin were $239.0 million and 59.2%, respectively, in the six months ended June 30, 2021, and $213.8 million and 58.0%, respectively, in the six months ended June 30, 2020.

Revenue from our Cloud and Edge segment was $141.4 million and $146.9 million in the three months and ended June 30, 2021 and 2020, respectively. Total gross profit and total gross margin for this segment were $95.5 million and 67.5% respectively, in the three months ended June 30, 2021, and $98.6 million and 67.1% in the three months ended June 30, 2020. Revenue from our Cloud and Edge segment was $266.8 million and $274.9 million in the six months ended June 30, 2021 and 2020, respectively. Total gross profit and total gross margin for this segment were $179.6 million and 67.3% respectively, in the six months ended June 30, 2021, and $177.4 million and 64.5% in the six months ended June 30, 2020.

Revenue from our IP Optical Networks segment was $69.8 million and $63.6 million in the three months ended June 30, 2021 and 2020, respectively. Total gross profit and total gross margin for this segment were $33.0 million and 47.2% respectively, in the three months ended June 30, 2021, and $24.7 million and 38.8% in the three months ended June 30, 2020. Revenue from our IP Optical Networks segment was $137.1 million and $93.5 million in the six months ended June 30, 2021 and 2020, respectively. Total gross profit and total gross margin for this segment were $59.3 million and 43.3% respectively, in the six months ended June 30, 2021, and $36.4 million and 38.9% in the six months ended June 30, 2020.

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Our operating expenses were $115.5 million and $121.7 million in the three months ended June 30, 2021 and 2020, respectively. Operating expenses for the three months ended June 30, 2021 included $17.2 million of amortization of acquired intangible assets, $1.1 million of acquisition-, disposal- and integration-related expense and $2.8 million of restructuring and related expense. Operating expenses for the three months ended June 30, 2020 included $14.7 million of amortization of acquired intangible assets, $0.9 million of acquisition-, disposal- and integration-related expense and $5.4 million of restructuring and related expense.

Our operating expenses were $238.6 million and $240.9 million in the six months ended June 30, 2021 and 2020 respectively. Operating expenses for the six months ended June 30, 2021 included $33.0 million of amortization of acquired intangible assets, $2.2 million of acquisition-, disposal- and integration-related expense and $8.8 million of restructuring and related expense. Our operating expenses for the six months ended June 30, 2020 included $29.0 million of amortization of acquired intangible assets, $13.2 million of acquisition-, disposal- and integration-related expense and $7.4 million of restructuring and related expense.

We recorded stock-based compensation expense of $4.8 million and $3.2 million in the three months ended June 30, 2021 and 2020, respectively, and $9.9 million and $6.2 million in the six months ended June 30, 2021 and 2020, respectively. These amounts are included as components of both Cost of revenue and Operating expenses in our condensed consolidated statements of operations.

See "Results of Operations" in this Management's Discussion and Analysis of Financial Condition and Results of Operations ("MD&A") for a discussion of the changes in our revenue and expenses for the three and six months ended June 30, 2021 compared to the three and six months ended June 30, 2020.

Restructuring and Cost Reduction Initiatives

2020 Restructuring Initiative. In 2020, we implemented a restructuring plan to eliminate certain positions and redundant facilities, primarily in connection with the ECI Acquisition, to further streamline our global footprint and improve our operations (the "2020 Restructuring Initiative"). In connection with this initiative, we expect to eliminate duplicate functions arising from the ECI Acquisition and support our efforts to integrate the two companies.

We recorded restructuring and related expense of $1.9 million and $4.7 million in connection with the 2020 Restructuring Initiative in the three months ended June 30, 2021 and 2020, respectively, and $2.3 million and $5.8 million in the six months ended June 30, 2021 and 2020, respectively.

The amount recorded in the three months ended June 30, 2021 was comprised of $1.9 million for severance and related costs for approximately 15 employees and nominal expense for variable costs related to restructured facilities. The amount recorded in the six months June 30, 2021 was comprised of $2.6 million of severance and related costs for approximately 25 employees and $0.4 million for variable costs related to restructured facilities, offset by a credit of $0.7 million for changes in estimate to previously recorded facilities-related amounts. The amount recorded in the six months ended June 30, 2020, of which $4.7 million was recorded in the three months ended June 30, 2020 and $1.1 million was recorded in the three months ended March 31, 2020, represents severance and related costs for approximately 75 employees. We expect that the amount accrued for severance at June 30, 2021 will be paid in 2021. We expect that we will record additional restructuring and related expense approximating $2 million under the 2020 Restructuring Initiative in the aggregate for severance and planned facility consolidations.

2019 Restructuring Initiative. In June 2019, we implemented a restructuring plan to further streamline our global footprint, improve our operations and enhance our customer delivery (the "2019 Restructuring Initiative"). The 2019 Restructuring Initiative includes facility consolidations, refinement of our research and development activities, and a reduction in workforce. In connection with this initiative, we expect to reduce our focus on hardware and hardware-based development over time and to increase our development focus on software virtualization, functional simplicity and important customer requirements. The facility consolidations under the 2019 Restructuring Initiative (the "Facilities Initiative") include a consolidation of our North Texas sites into a single campus, housing engineering, customer training and support, and administrative functions, as well as a reduction or elimination of certain excess and duplicative facilities worldwide. In addition, we are substantially consolidating our global software laboratories and server farms into two lower cost North American sites. We continue to evaluate our properties included in the Facilities Initiative for accelerated amortization and/or right-of-use asset impairment. We expect that the actions under the Facilities Initiative will be completed in 2021.

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In connection with the 2019 Restructuring Initiative, we recorded restructuring and related expense of $0.9 million and $0.7 million in the three months ended June 30, 2021 and 2020, respectively, and $6.5 million and $1.7 million in the six months ended June 30, 2021 and 2020, respectively.

The amount recorded in the three months ended June 30, 2021 related to variable facilities costs. Of the amount recorded in the six months ended June 30, 2021, $3.4 million was for accelerated amortization of lease assets and $3.1 million related to variable and other facilities-related costs in connection with facility consolidations. The amount recorded in the three months ended June 30, 2020 primarily related to facility consolidations. The amount recorded in the six months ended June 30, 2020 was comprised of $0.7 million for severance and related costs for five employees and $1.0 million related to facility consolidations. As of June 30, 2021, the amounts accrued for severance and related costs had been paid in full. We estimate that we will record nominal, if any, additional restructuring and related expense in connection with this initiative.

Accelerated Rent Amortization. Accelerated rent amortization is recognized from the date that we commence the plan to fully or partially vacate a facility, for which there is no intent or ability to enter into a sublease, through the final vacate date. We recorded $3.4 million and $0.1 million for accelerated rent amortization in the six months ended June 30, 2021 and 2020, respectively, in connection with our 2019 Restructuring Initiative. These amounts are included as components of Restructuring and related expense. We continue to evaluate our properties included in the Facilities Initiative for accelerated amortization and/or right-of-use asset impairment. We may incur additional future expense if we are unable to sublease other locations included in the Facilities Initiative.

Critical Accounting Policies and Estimates

Management's discussion and analysis of financial condition and results of operations is based upon our condensed consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. We base our estimates and judgments on historical experience, knowledge of current conditions and beliefs of what could occur in the future given available information. We consider the following accounting policies to be both those most important to the portrayal of our financial condition and those that require the most subjective judgment: revenue recognition, the valuation of inventory, the valuation of the Debentures and Warrants received as consideration in connection with the Kandy Sale, warranty accruals, loss contingencies and reserves, stock-based compensation, business combinations, goodwill and intangible assets, accounting for leases, and accounting for income taxes. If actual results differ significantly from management's estimates and projections, there could be a material effect on our condensed consolidated financial statements. There were no significant changes to our critical accounting policies from January 1, 2021 through June 30, 2021. For a further discussion of our other critical accounting policies and estimates, please refer to our Annual Report on Form 10-K for the year ended December 31, 2020.

Results of Operations

Three and six months ended June 30, 2021 and 2020

Revenue. Revenue for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands, except percentages):

	Three months ended				Increase (decrease) from prior year
	June 30, 2021		June 30, 2020		$		%
Product	$	113,129	$	120,862	$	(7,733)	(6.4)	%
Service	98,081		89,631		8,450		9.4	%
Total revenue	$	211,210	$	210,493	$	717	0.3	%

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	Six months ended				Increase from prior year
	June 30, 2021		June 30, 2020		$		%
Product	$	211,018	$	196,761	$	14,257	7.2	%
Service	192,964		171,714		21,250		12.4	%
Total revenue	$	403,982	$	368,475	$	35,507	9.6	%

Segment revenue for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended June 30, 2021						Three months ended June 30, 2020
	Cloud and Edge		IP Optical Networks		Total		Cloud and Edge		IP Optical Networks		Total
Product	$	64,361	$	48,768	$	113,129	$	72,310	$	48,552	$	120,862
Service	77,060		21,021		98,081		74,597		15,034		89,631
Total revenue	$	141,421	$	69,789	$	211,210	$	146,907	$	63,586	$	210,493

	Six months ended June 30, 2021						Six months ended June 30, 2020
	Cloud and Edge		IP Optical Networks		Total		Cloud and Edge		IP Optical Networks		Total
Product	$	114,513	$	96,505	$	211,018	$	126,520	$	70,241	$	196,761
Service	152,330		40,634		192,964		148,418		23,296		171,714
Total revenue	$	266,843	$	137,139	$	403,982	$	274,938	$	93,537	$	368,475

The decrease in our product revenue in the three months ended June 30, 2021 compared to the three months ended June 30, 2020 was primarily the result of lower sales of our Cloud and Edge SBC products and the loss of revenue due to the Kandy Sale, partially offset by higher revenue from sales of certain Cloud and Edge software applications. Product revenue for our IP Optical Networks segment was essentially flat in the three months ended June 30, 2021 compared to the three months ended June 30, 2020.

The increase in our product revenue in the six months ended June 30, 2021 compared to the six months ended June 30, 2020 was primarily attributable to the inclusion of a full half-year of revenue from our IP Optical Networks segment, compared to four months of revenue in the six months ended June 30, 2020. This increase was partially offset by lower sales of our Cloud and Edge SBC products and the loss of revenue due to the Kandy Sale, partially offset by higher revenue from sales of certain Cloud and Edge software applications.

Revenue from indirect sales through our channel partner program was approximately 24% and 27% of our product revenue in the three months ended June 30, 2021 and 2020, respectively. Revenue from indirect sales through our channel partner program was approximately 22% and 31% of our product revenue in the six months ended June 30, 2021 and 2020, respectively.

Revenue from sales to enterprise customers was approximately 22% and 30% of our product revenue in the three months ended June 30, 2021 and 2020, respectively. Revenue from sales to enterprise customers was approximately 22% and 32% of our product revenue in the six months ended June 30, 2021 and 2020, respectively. These sales were made through both our direct sales team and indirect sales channel partners.

The timing of the completion of customer projects and revenue recognition criteria satisfaction may cause our product revenue to fluctuate from one period to the next.

Service revenue is primarily comprised of hardware and software maintenance and support (“maintenance revenue”) and network design, installation and other professional services (“professional services revenue”).

Service revenue for the three and six months ended June 30, 2021 and 2020 was comprised of the following (in thousands, except percentages):

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	Three months ended				Increase from prior year
	June 30, 2021		June 30, 2020		$		%
Maintenance	$	72,437	$	68,623	$	3,814	5.6	%
Professional services	25,644		21,008		4,636		22.1	%
	$	98,081	$	89,631	$	8,450	9.4	%

	Six months ended				Increase from prior year
	June 30, 2021		June 30, 2020		$		%
Maintenance	$	141,142	$	129,691	$	11,451	8.8	%
Professional services	51,822		42,023		9,799		23.3	%
	$	192,964	$	171,714	$	21,250	12.4	%

Segment service revenue for the three and six months ended June 30, 2021 and 2020 was comprised of the following (in thousands):

	Three months ended June 30, 2021						Three months ended June 30, 2020
	Cloud and Edge		IP Optical Networks		Total		Cloud and Edge		IP Optical Networks		Total
Maintenance	$	57,986	$	14,451	$	72,437	$	57,853	$	10,770	$	68,623
Professional services	19,074		6,570		25,644		16,744		4,264		21,008
Total service revenue	$	77,060	$	21,021	$	98,081	$	74,597	$	15,034	$	89,631

	Six months ended June 30, 2021						Six months ended June 30, 2020
	Cloud and Edge		IP Optical Networks		Total		Cloud and Edge		IP Optical Networks		Total
Maintenance	$	112,659	$	28,483	$	141,142	$	113,409	$	16,282	$	129,691
Professional services	39,671		12,151		51,822		35,009		7,014		42,023
Total service revenue	$	152,330	$	40,634	$	192,964	$	148,418	$	23,296	$	171,714

The increase in maintenance revenue in the three months ended June 30, 2021 compared to the three months ended June 30, 2020 was primarily attributable to approximately $4 million of higher revenue from our IP Optical Networks segment. The increase in maintenance revenue in the six months ended June 30, 2021 compared to the six months ended June 30, 2020 was primarily due to approximately $12 million of higher revenue from our IP Optical Networks segment, partially offset by approximately $1 million of lower revenue from our Cloud and Edge segment. The increase in IP Optical Networks maintenance revenue in the six months ended June 30, 2021 was partially attributable to the inclusion of a full half-year of revenue in the current year period, compared to four months of revenue in the prior year period.

The increase in professional services revenue in the three months ended June 30, 2021 compared to the three months ended June 30, 2020 was equally attributable to Cloud and Edge and IP Optical Networks segments, each of which accounted for approximately $2 million of higher revenue in the current year quarter compared to the same prior year quarter. The increase in professional services revenue in the six months ended June 30, 2021 compared to the six months ended June 30, 2020 was attributable to approximately $5 million from each of our segments. The increase in IP Optical Networks professional services revenue in the six months ended June 30, 2021 was partially attributable to the inclusion of a full half-year of revenue in the current year period, compared to four months of revenue in the prior year period.

The following customer contributed 10% or more of our revenue in the three and six month periods ended June 30, 2021

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and 2020:

	Three months ended		Six months ended
Customer	June 30, 2021	June 30, 2020	June 30, 2021	June 30, 2020
Verizon Communications Inc.	17%	15%	16%	14%

Revenue from customers domiciled outside the United States was approximately 52% of revenue in both the three months ended June 30, 2021 and 2020, and approximately 55% and 51% of revenue in the six months ended June 30, 2021 and 2020, respectively. Due to the timing of project completions, we expect that the domestic and international components as a percentage of revenue may fluctuate from quarter to quarter and year to year.

Our deferred product revenue was approximately $7 million and $8 million at June 30, 2021 and December 31, 2020, respectively. Our deferred service revenue was approximately $117 million and $115 million at June 30, 2021 and December 31, 2020, respectively. Our deferred revenue balance may fluctuate because of the timing of revenue recognition, customer payments, maintenance contract renewals, contractual billing rights and maintenance revenue deferrals included in multiple element arrangements.

We expect that our total revenue in 2021 will increase compared to 2020 as a result of both increased customer spend and continued cross-selling opportunities.

Cost of Revenue/Gross Margin. Our cost of revenue consists primarily of amounts paid to third-party manufacturers for purchased materials and services, royalties, inventory valuation adjustments, warranty costs, and manufacturing and services personnel and related costs. Our cost of revenue and gross margins for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands, except percentages):

	Three months ended						Decrease from prior year
	June 30, 2021			June 30, 2020			$		%
Cost of revenue
Product	$	46,641		$	50,579		$	(3,938)	(7.8)	%
Service	36,142			36,647			(505)		(1.4)	%
Total cost of revenue	$	82,783		$	87,226		$	(4,443)	(5.1)	%
Gross margin
Product	58.8		%	58.2		%
Service	63.2		%	59.1		%
Total gross margin	60.8		%	58.6		%

	Six months ended						Increase from prior year
	June 30, 2021			June 30, 2020			$		%
Cost of revenue
Product	$	91,086		$	86,558		$	4,528	5.2	%
Service	73,922			68,126			5,796		8.5	%
Total cost of revenue	$	165,008		$	154,684		$	10,324	6.7	%
Gross margin
Product	56.8		%	56.0		%
Service	61.7		%	60.3		%
Total gross margin	59.2		%	58.0		%

Our segment cost of revenue and gross margins for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands, except percentages):

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	Three months ended June 30, 2021						Three months ended June 30, 2020
	Cloud and Edge		IP Optical Networks		Total		Cloud and Edge		IP Optical Networks		Total
Product	$	19,112	$	27,529	$	46,641	$	21,714	$	28,865	$	50,579
Service	26,846		9,296		36,142		26,602		10,045		36,647
Total cost of revenue	$	45,958	$	36,825	$	82,783	$	48,316	$	38,910	$	87,226

Product	70.3	%	43.6	%	58.8	%	70.0	%	40.5	%	58.2	%
Service	65.2	%	55.8	%	63.2	%	64.3	%	33.2	%	59.1	%
Total gross margin	67.5	%	47.2	%	60.8	%	67.1	%	38.8	%	58.6	%

	Six months ended June 30, 2021						Six months ended June 30, 2020
	Cloud and Edge		IP Optical Networks		Total		Cloud and Edge		IP Optical Networks		Total
Product	$	32,533	$	58,553	$	91,086	$	43,251	$	43,307	$	86,558
Service	54,685		19,237		73,922		54,318		13,808		68,126
Total cost of revenue	$	87,218	$	77,790	$	165,008	$	97,569	$	57,115	$	154,684

Product	71.6	%	39.3	%	56.8	%	65.8	%	38.3	%	56.0	%
Service	64.1	%	52.7	%	61.7	%	63.4	%	40.7	%	60.3	%
Total gross margin	67.3	%	43.3	%	59.2	%	64.5	%	38.9	%	58.0	%

Our product gross margin increased in the three months ended June 30, 2021 compared to the three months ended June 30, 2020, primarily due to margin improvement in our IP Optical Networks segment. The increase in product gross margin of our IP Optical Networks segment was primarily attributable to customer geography and product mix. The increase in our product gross margin in the six months ended June 30, 2021 compared to the six months ended June 30, 2020 was primarily due to margin improvement in our Cloud and Edge segment. This increase was primarily attributable to the impact of the Kandy Sale and, to a lesser extent, customer and product mix. We also had margin improvement in our IP Optical Networks segment in the six months ended June 30, 2021 compared to the same prior year period from the ECI Acquisition Date to June 30, 2020.

The increase in our service gross margin in both the three and six months ended June 30, 2021 compared to the three and six months ended June 30, 2020 was primarily due to margin improvement in both of our segments. Our Cloud and Edge segment's margin improvement was primarily due to lower fixed costs, while the margin improvement in our IP Optical Networks segments was primarily attributable to the segment's higher revenue in the current year periods against its fixed cost base.

We believe that our total gross margin will decrease slightly in 2021 compared to 2020, primarily due to higher expected sales from IP Optical Networks, which have historically lower margins due to the higher hardware content in their products.

Research and Development Expenses. Research and development expenses consist primarily of salaries and related personnel expenses and prototype costs for the design, development, testing, and enhancement of our products. Research and development expenses for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands, except percentages):

					Increase (decrease) from prior year
	June 30, 2021		June 30, 2020		$		%
Three months ended	$	46,797	$	51,796	$	(4,999)	(9.7)	%
Six months ended	$	94,207	$	94,091	$	116	0.1	%

The decrease in research and development expenses in the three months ended June 30, 2021 compared to the three months ended June 30, 2020 was primarily attributable to approximately $6 million of lower expenses in our Cloud and Edge segment,

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all primarily employee-related and product development costs, partially offset by approximately $1 million of higher expenses in our IP Optical Networks segment, primarily for infrastructure-related and product development costs.

Our research and development expenses were essentially flat in the six months ended June 30, 2021 compared to the six months ended June 30, 2020, with lower expenses in our Cloud and Edge segment related to the sale of Kandy. These reductions were partially offset by higher expenses in our IP Optical Networks segment, primarily due to the inclusion of a half-year of IP Optical Networks expense compared to only four months of expense in the prior year period, principally for employee- and infrastructure-related and product development costs.

Some aspects of our research and development efforts require significant short-term expenditures, the timing of which may cause significant variability in our expenses. We believe that rapid technological innovation is critical to our long-term success, and we are tailoring our investments to meet the requirements of our customers and market. We believe that our research and development expense in 2021 will increase compared to 2020, primarily due to incremental investment in our IP Optical Networks segment to address the global market opportunity.

Sales and Marketing Expenses. Sales and marketing expenses primarily consist of salaries and related personnel costs, commissions, travel and entertainment expenses, promotions, customer trial and evaluations inventory, and other marketing and sales support expenses. Sales and marketing expenses for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands, except percentages):

					Increase from prior year
	June 30, 2021		June 30, 2020		$		%
Three months ended	$	34,881	$	33,898	$	983	2.9	%
Six months ended	$	72,099	$	64,869	$	7,230	11.1	%

The increase in sales and marketing expenses in the three months ended June 30, 2021 compared to the three months ended June 30, 2020 was primarily attributable to approximately $2 million of higher expenses in our IP Optical Networks segment, primarily for employee-related costs, partially offset by approximately $1 million of lower expense in our Cloud and Edge segment, primarily for employee-related costs.

The increase in sales and marketing expenses in the six months ended June 30, 2021 compared to the six months ended June 30, 2020 was primarily attributable to the inclusion of a full half-year of IP Optical Networks expense, compared to only four months of expense in the prior year period, which added approximately $11 million in sales and marketing expenses, principally employee- and infrastructure-related costs. This increase was partially offset by approximately $4 million of lower expenses in our Cloud and Edge segment, primarily employee-related and marketing costs.

We believe that our sales and marketing expenses will increase modestly in 2021 compared with 2020, primarily due to higher employee-related expenses and higher costs, assuming COVID-19 restrictions continue to ease.

General and Administrative Expenses. General and administrative expenses consist primarily of salaries and related personnel costs for executive and administrative personnel, and audit, legal and other professional fees. General and administrative expenses for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands, except percentages):

					Decrease from prior year
	June 30, 2021		June 30, 2020		$		%
Three months ended	$	12,734	$	15,094	$	(2,360)	(15.6)	%
Six months ended	$	28,287	$	32,299	$	(4,012)	(12.4)	%

The decrease in general and administrative expenses in the three months ended June 30, 2021 compared to the three months ended June 30, 2020 was primarily attributable to approximately $2 million of lower professional fees and approximately $1 million of lower employee-related expenses. The reduction in professional fees in the three months ended June 30, 2021 was attributable to both of our segments, while the reduction in employee-related expenses was attributable to our IP Optical Networks segment.

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The decrease in general and administrative expenses in the six months ended June 30, 2021 compared to the six months ended June 30, 2020 was primarily attributable to the absence in the current year period of approximately $2 million of litigation-related expense in our Cloud and Edge segment, coupled with approximately $2 million of lower professional fees (i.e., consulting, legal and audit fees) and approximately $1 million of net reductions in other Cloud and Edge expenses. These reductions were partially offset by approximately $1 million of IP Optical Networks expense, principally for employee-related costs

We believe that our general and administrative expenses in 2021 will be consistent with our 2020 levels and decline in future years as we realize additional integration synergies.

Amortization of Acquired Intangible Assets. Amortization of acquired intangible assets for the three and months ended June 30, 2021 and 2020 was as follows (in thousands, except percentages):

					Increase from prior year
	June 30, 2021		June 30, 2020		$		%
Three months ended	$	17,181	$	14,669	$	2,512	17.1	%
Six months ended	$	33,004	$	29,003	$	4,001	13.8	%

The increase in amortization of acquired intangible assets in both the three and six months ended June 30, 2021 compared to the same prior year periods was primarily due to the recognition of such expense in relation to expected future cash flows; accordingly, amortization of intangible assets is not recorded on a straight-line basis, coupled with the inclusion of amortization expense for the full half-year in 2021, compared to four months of expense in the same prior year period.

Acquisition-, Disposal- and Integration-Related Expenses. Acquisition-, disposal- and integration-related expenses include those expenses related to acquisitions that we would otherwise not have incurred. Acquisition- and disposal-related expenses include professional and services fees, such as legal, audit, consulting, paying agent and other fees. Integration-related expenses represent incremental costs related to combining our systems and processes with those of acquired businesses, such as third-party consulting and other third-party services.

Our acquisition-, disposal- and integration-related expenses for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Professional and services fees (acquisition-related)	$	143	$	640	$	143	$	13,014
Professional and services fees (disposal-related)	—		—		241		—
Integration-related expenses	909		217		1,865		227
	$	1,052	$	857	$	2,249	$	13,241

Our acquisition-related expenses in the three and six months ended June 30, 2020 primarily relate to the ECI Acquisition. The disposal-related expenses in the six months ended June 30, 2021 relate to the Kandy Sale. Acquisition-, disposal- and integration-related expenses are reported separately in the condensed consolidated statements of operations.

Restructuring and Related Expense. We have been committed to streamlining our operations and reducing operating costs by closing and consolidating certain facilities and reducing our worldwide workforce. Please see the additional discussion of our restructuring initiatives in the "Restructuring and Cost Reduction Initiatives" section of the Overview of this MD&A.

We recorded restructuring and related expense of $2.8 million and $8.8 million in the three and six months ended June 30, 2021, respectively. We recorded restructuring and related expense of $5.4 million and $7.4 million in the three and six months ended June 30, 2020, respectively. Although we have eliminated positions as part of our restructuring initiatives, we continue to hire in certain areas that we believe are important to our future growth. Restructuring and related expense is reported separately in the condensed consolidated statements of operations.

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Interest Expense, Net. Interest income and interest expense for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands, except percentages):

	Three months ended				Increase decrease) from prior year
	June 30, 2021		June 30, 2020		$		%
Interest income	$	1,259	$	98	$	1,161	1,184.7	%
Interest expense	(4,307)		(5,498)		(1,191)		(21.7)	%
	$	(3,048)	$	(5,400)	$	(2,352)	(43.6)	%

	Six months ended				Increase from prior year
	June 30, 2021		June 30, 2020		$		%
Interest income	$	2,744	$	416	$	2,328	559.6	%
Interest expense	(11,611)		(9,211)		2,400		26.1	%
	$	(8,867)	$	(8,795)	$	72	0.8	%

Interest income in both the three and six months ended June 30, 2021 was primarily due to the paid-in-kind interest on the Debentures, which was recorded as an increase to the fair value of the Debentures. Interest expense in the three and six months ended June 30, 2021 was comprised of interest and debt issuance costs in connection with the 2020 Credit Facility (as defined below), including the write-off of $2.5 million of capitalized debt insurance costs in connection with the Third Amendment (as defined below), coupled with interest on finance leases.

Interest income in the three and six months ended June 30, 2020 primarily represents interest earned on the outstanding note receivable arising from litigation that was settled in 2019. Interest expense in the three and six months ended June 30, 2020 was comprised of interest and debt issuance costs in connection with the 2020 Credit Facility, interest on other borrowings and finance leases, and interest expense recorded in connection with the factoring of certain accounts receivable. Interest expense in the six months ended June 30, 2020 also included the write-off of debt issuance costs in connection with the retirement of the 2019 Credit Facility.

Income Taxes. We recorded provisions for income taxes of $4.7 million and $2.2 million in the six months ended June 30, 2021 and 2020, respectively. These amounts reflect our estimates of the effective rates expected to be applicable for the respective full fiscal years, adjusted for any discrete events, which are recorded in the period that they occur. These estimates are reevaluated each quarter based on our estimated tax rate for the full fiscal year. The estimated effective tax rate includes the impact of valuation allowances in various jurisdictions.

Off-Balance Sheet Arrangements

We have no off-balance sheet arrangements that have or are reasonably likely to have a current or future material effect on our financial position, changes in financial position, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources.

Liquidity and Capital Resources

Our condensed consolidated statements of cash flows are summarized as follows (in thousands):

	Six months ended
	June 30, 2021		June 30, 2020		Change
Net loss	$	(21,446)	$	(41,421)	$	19,975
Adjustments to reconcile net loss to cash flows provided by operating activities	64,343		49,506		14,837
Changes in operating assets and liabilities	(34,867)		28,627		(63,494)
Net cash provided by operating activities	$	8,030	$	36,712	$	(28,682)
Net cash used in investing activities	$	(7,626)	$	(318,243)	$	310,617
Net cash (used in) provided by financing activities	$	(20,858)	$	331,074	$	(351,932)

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Our cash and restricted cash aggregated approximately $115 million at June 30, 2021and $136 million at December 31, 2020. These amounts included cash and restricted cash aggregating approximately $32 million at June 30, 2021 and $46 million at December 31, 2020 held by our non-U.S. subsidiaries. If we elected to repatriate all excess funds held by our non-U.S. subsidiaries as of June 30, 2021, we do not believe that the amounts of potential withholding taxes that would arise from the repatriation would have a material effect on our liquidity.

We currently maintain the Senior Secured Credit Facilities Credit Agreement (as amended, the "2020 Credit Facility"), by and among us, as a guarantor, Ribbon Communications Operating Company, Inc., as the borrower ("Borrower"), Citizens Bank, N.A. ("Citizens"), as administrative agent, a lender, issuing lender, swingline lender, joint lead arranger and bookrunner, Santander Bank, N.A., as a lender, joint lead arranger and bookrunner, and the other lenders party thereto (each, together with Citizens Bank, N.A. and Santander Bank, N.A., referred to individually as a "Lender", and collectively, the "Lenders"). For additional details regarding the terms of the 2020 Credit Facility, see Note 10 to our condensed consolidated financial statements.

On March 3, 2021 (the "Third Amendment Effective Date"), we entered into a Third Amendment to Credit Agreement (the "Third Amendment"), which further amended the 2020 Credit Facility. The Third Amendment provided for an incremental term loan facility to us in the original principal amount of $74.6 million, the proceeds of which were used on the Third Amendment Effective Date to consummate an open market purchase of all outstanding amounts under the Term B Loan. Upon the consummation of the open market purchase, the Term B Loans were assigned to the Borrower and immediately canceled, such that the outstanding amount under the Term A Loan and incremental term loan facility were combined and held by the Lenders (the "2020 Term Loan"). We are required to make quarterly principal payments on the 2020 Term Loan aggregating approximately $20 million per year in the first three years and $30 million in the fourth year, with the final payment approximating $300 million due on the maturity date.

At June 30, 2021, we had an outstanding 2020 Term Loan balance of $385.5 million at an average interest rate of 3.40% and $6.4 million of letters of credit outstanding with an interest rate of 2.50%. We were in compliance with all covenants of the 2020 Credit Facility at both June 30, 2021 and December 31, 2020.

We are exposed to financial market risk related to foreign currency fluctuations and changes in interest rates. These exposures are actively monitored by management. To manage the volatility related to the exposure to changes in interest rates, we have entered into a derivative financial instrument. Management's objective is to reduce, where it is deemed appropriate to do so, fluctuations in earnings and cash flows associated with changes in interest rates. Our policies and practices are to use derivative financial instruments only to the extent necessary to manage exposures. We do not hold or issue derivative financial instruments for trading or speculative purposes.

As a result of exposure to interest rate movements, during March 2020, we entered into an interest rate swap arrangement, which effectively converted our $400 million term loan with its variable interest rate based upon one-month LIBOR to an aggregate fixed rate of 0.904%, plus a leverage-based margin as defined in the 2020 Credit Facility. The notional amount of this swap as of June 30, 2021 was $400 million, and the swap matures on March 3, 2025, the same date the 2020 Credit Facility matures.

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we are using an interest rate swap as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) in the condensed consolidated balance sheet and is subsequently reclassified into earnings in the period that the hedged forecasted transactions affect earnings. During the three and six months ended June 30, 2021 and 2020, such a derivative was used to hedge the variable cash flows associated with the 2020 Credit Facility. Any ineffective portion of the change in fair value of the derivative would be recognized directly in earnings. However, during the three and six months ended June 30, 2021 and 2020, we recorded no hedge ineffectiveness.

Amounts reported in accumulated other comprehensive income (loss) related to our derivative will be reclassified to interest expense as interest is accrued on our variable-rate debt. Based upon projected forward rates, we estimate as of June 30, 2021 that $3.2 million may be reclassified as an increase to interest expense over the next 12 months.

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From time to time, we enter into uncommitted and unsecured short-term loans to finance exports in China. We did not have any such short-term loans outstanding at June 30, 2021 and December 31, 2020.

We use letters of credit, performance and bid bonds in the course of our business. At June 30, 2021, we had bank guarantees, performance and bid bonds under various uncommitted facilities (collectively, the "Guarantees") aggregating $24.9 million, and $6.4 million of letters of credit under the 2020 Credit Facility (the "Letters of Credit"). At December 31, 2020, we had Guarantees aggregating $27.0 million and $5.6 million of Letters of Credit. At June 30, 2021 and December 31, 2020, we had cash collateral of $2.6 million and $2.7 million, respectively, supporting the Guarantees, which are included in Restricted cash in our condensed consolidated balance sheets.

In the second quarter of 2019, our Board of Directors (the "Board") approved a stock repurchase program pursuant to which we could repurchase up to $75 million of the Company's common stock prior to April 18, 2021. Repurchases under the program could be made in the open market, in privately negotiated transactions or otherwise, with the amount and timing of repurchases depending on the market conditions and corporate discretion. This program did not obligate us to acquire any particular amount of common stock and the program could have been extended, modified, suspended or discontinued at any time at the Board's discretion. We did not repurchase any shares during the six months ended June 30, 2021 or the year ended December 31, 2020. At December 31, 2020, we had $70.5 million remaining under the Repurchase Program for future repurchases. The Repurchase Program expired on April 18, 2021.

Cash Flows from Operating Activities

Our operating activities provided $8.0 million and $36.7 million of cash in the six months ended June 30, 2021 and 2020, respectively.

Cash provided by operating activities in the six months ended June 30, 2021 was primarily the result of lower accounts receivable and other operating assets, and slightly higher deferred revenue, coupled with our non-cash operating activities. These amounts were partially offset by our net loss, lower accrued expenses and other long-term liabilities, lower accounts payable and higher inventory. Our lower accounts receivable reflected typical mid-year seasonality. The decrease in accrued expenses and other long-term liabilities was primarily due to the cash payments related to our employee cash bonus program, facilities, professional fees and royalties.

Cash provided by operating activities in the six months ended June 30, 2020 was primarily the result of lower accounts receivable, other operating assets and inventory, higher accrued expenses and other long-term liabilities, and our non-cash operating activities. These amounts were partially offset by our net loss and lower accounts payable. Our lower accounts receivable primarily reflected typical mid-year seasonality. The decrease in other operating assets was primarily due to the scheduled payment received in connection with a litigation settlement in 2019. The increase in accrued expenses and other long-term liabilities was primarily due to the derivative liability we recorded in connection with our interest rate swap, which we entered into in the first quarter of 2020.

Cash Flows from Investing Activities

Our investing activities used $7.6 million of cash in the six months ended June 30, 2021, comprised of $10.6 million to purchase property and equipment, partially offset by $2.9 million of proceeds from the sale of our QualiTech business, which operates compliance testing laboratories in Israel for reliability and standardization testing for the high-tech industry, including testing in medical equipment, military equipment and vehicles.

Our investing activities used $318.2 million of cash in the six months ended June 30, 2020, comprised of $346.9 million of cash paid as cash consideration for ECI and $14.9 million of investments in property and equipment. These amounts were partially offset by $43.5 million of cash proceeds from the sale of land in connection with the ECI Acquisition.

Cash Flows from Financing Activities

Our financing activities used $20.9 million of cash in the six months ended June 30, 2021. We received $74.6 million of proceeds from the incremental loan obtained in connection with the Third Amendment, which amount was used to consummate an open market purchase of all outstanding amounts under the Term B Loan. In addition, we used $12.1 million for the payment of tax withholding obligations related to the net share settlement of restricted stock awards upon vesting, and $82.1 million of principal payments of term debt, including the $74.6 million payoff of the Term B Loan in connection with the Third Amendment, $0.8 million of payments of debt issuance costs and $0.5 million for principal payments of finance leases.

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Our financing activities provided $331.1 million of cash in the six months ended June 30, 2020, primarily due to $403.5 million of proceeds from term debt, which was comprised of $400.0 million of proceeds from the 2020 Credit Facility and $3.5 million of proceeds from short-term loans in China for the financing of certain export activities. We also recorded $0.6 million of borrowings under the 2020 Credit Facility. These proceeds were partially offset by the repayment of amounts outstanding under the 2019 Credit Facility aggregating $56.7 million at the time we entered into the 2020 Credit Facility, $10.6 million for the payment of debt issuance costs in connection with the 2020 Credit Facility, $0.8 million for the payment of tax withholding obligations related to the net share settlement of restricted stock awards upon vesting and $0.7 million for principal payments of finance leases.

Based on our current expectations, we believe our current cash and available borrowings under the 2020 Credit Facility will be sufficient to meet our anticipated cash needs for working capital and capital expenditures for at least twelve months. The rate at which we consume cash is dependent on the cash needs of our future operations. We anticipate devoting substantial capital resources to continue our research and development efforts, to maintain our sales, support and marketing, to complete acquisition-related integration activities and for other general corporate activities. We further believe that our financial resources, along with managing discretionary expenses, will allow us to manage the anticipated impact of the COVID-19 pandemic on our business operations. Looking ahead, we have developed contingency plans to reduce costs further if the situation continues to deteriorate. The challenges posed by the COVID-19 pandemic on our business continue to evolve rapidly. Consequently, we continue to evaluate our financial position in light of future developments, particularly those relating to the COVID-19 pandemic. However, it is difficult to predict future liquidity requirements with certainty, and our cash and available borrowings under the 2020 Credit Facility may not be sufficient to meet our future needs, which would require us to refinance our debt and/or obtain additional financing. We may not be able to refinance our debt or obtain additional financing on favorable terms or at all.

Recent Accounting Pronouncements

The Financial Accounting Standards Board ("FASB") issued the following accounting pronouncement which became effective for us in 2021, and which did not have a material impact on our condensed consolidated financial statements:

The FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes ("ASU 2019-12"), which modifies ASC 740 to simplify the accounting for income taxes. ASU 2019-12 addresses the accounting for hybrid tax regimes, tax basis step-up in goodwill obtained in a transaction that is not a business combination, separate financial statements of legal entities not subject to tax, intraperiod tax allocation exception to incremental approach, ownership changes in investments - changes from a subsidiary to an equity method investment, ownership changes in investments - changes from an equity method investment to a subsidiary, interim period accounting for enacted changes in tax law and year-to-date loss limitation in interim period tax accounting.

The FASB issued the following accounting pronouncement, which we do not believe will have a material impact on our condensed consolidated financial statements upon adoption:

In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope ("ASU 2021-01"), which refines the scope of Accounting Standards Codification 848, Reference Rate Reform ("ASC 848") and clarifies some of its guidance as part of the FASB's monitoring of global reference rate reform activities. ASU 2021-01 permits entities to elect certain optional expedients and exceptions when accounting for derivative contracts and certain hedging relationships affected by changes in the interest rates used for discounting cash flows, for computing variation margin settlements, and for calculating price alignment interest in connection with reference rate reform activities under way in global financial markets (the "discounting transition"). ASU 2021-01 is effective for us prospectively in any period through December 31, 2022 that a modification is made to the terms of the derivatives affected by the discounting transition.

Item 3.    Quantitative and Qualitative Disclosures About Market Risk

We are exposed to financial market risk related to foreign currency fluctuations and changes in interest rates. Except as presented below, there have been no material changes in market risk from the information provided in Item 7A. Quantitative and Qualitative Disclosures About Market Risk of our Annual Report on Form 10-K, for the year ended December 31, 2020.

To manage the volatility related to the exposure to changes in interest rates, we have entered into a derivative financial instrument. Our objective is to reduce, where it is deemed appropriate to do so, fluctuations in earnings and cash flows

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associated with changes in interest rates. Our policies and practices are to use derivative financial instruments only to the extent necessary to manage exposures. We do not hold or issue derivative financial instruments for trading or speculative purposes.

Amounts reported in accumulated other comprehensive income (loss) related to our derivative will be reclassified to interest expense as interest is accrued on our variable-rate debt. The fair value of our derivative was a liability of $4.5 million at June 30, 2021. Based upon projected forward rates, we estimate as of June 30, 2021 that $3.2 million may be reclassified as an increase to interest expense over the next twelve months.

Item 4.    Controls and Procedures

Disclosure Controls and Procedures

Evaluation of Disclosure Controls and Procedures. Our management, with the participation of our principal executive officer and principal financial officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on this evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective as of June 30, 2021.

Changes in Internal Control over Financial Reporting. There have been no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fiscal quarter ended June 30, 2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II OTHER INFORMATION

Item 1.    Legal Proceedings

We are subject to legal proceedings and claims that have not been fully resolved and that have arisen in the ordinary course of business. Our material legal proceedings as described in Part I, Item 1 of this Form 10-Q in the Notes to Condensed Consolidated Financial Statements in Note 19, "Commitments and Contingencies," under the heading "Litigation."

The outcome of litigation is inherently uncertain. If one or more legal matters were resolved against the Company in a reporting period for amounts above management's expectations, our financial condition and operating results for that reporting period could be materially adversely affected. We settled certain matters during the fourth quarter of 2020 that did not individually or in the aggregate have a material impact on our financial condition or results of operations.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(c) Issuer Purchases of Equity Securities

The following table provides information with respect to the shares of common stock repurchased by us for the periods indicated:

Period	Total Number of Shares Purchased (1)	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Approximate Dollar Value of Shares that May Yet be Purchased Under the Plans or Programs (3)
April 1, 2021 to April 30, 2021	4,047	$	8.45	—	$	70,463,973
May 1, 2021 to May 31, 2021	1,770	$	6.97	—	$	—
June 1, 2021 to June 30, 2021	98,261	$	7.98	—	$	—
Total	104,078	$	7.98	—	$	—

(1) Upon vesting of restricted stock awards, certain of our employees surrender to us a portion of the newly vested shares of common stock to satisfy the tax withholding obligations that arise in connection with such vesting. During the second quarter of 2021, 104,078 shares of restricted stock were returned to us by employees to satisfy tax withholding obligations arising in connection with vesting of restricted stock, which shares are included in this column.

(2) On May 2, 2019, we announced a stock repurchase program, under which our Board of Directors authorized the repurchase of up to $75 million of our common stock from time to time on the open market or in privately negotiated transactions prior to April 18, 2021 (the "Repurchase Program"). We did not repurchase any shares of our common stock under the program during the second quarter of 2021. The Repurchase Program expired on April 18, 2021.

(3) Represents amounts available for repurchases under the Repurchase Program.

Item 5. Other Information

None.

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Item 6.    Exhibits

Exhibit No.		Description
2.1		Agreement and Plan of Merger, dated as of November 14, 2019, by and among the Registrant, Ribbon Communications Israel Ltd., Eclipse Communications Ltd., ECI Telecom Group Ltd. and ECI Holding (Hungary) Korlátolt Felelősségű Társág (incorporated by reference to Exhibit 2.1 to the Registrant's Current Report on Form 8-K, filed November 14, 2019 with the SEC).
2.2		Amended and Restated Purchase Agreement, dated December 1, 2020, among Ribbon Communications Inc., Ribbon Communications Operating Company, Inc., Ribbon Communications International Limited and American Virtual Cloud Technologies, Inc. (incorporated by reference to Exhibit 2.1 to the Registrant's Current Report on Form 8-K, filed December 7, 2020 with the SEC).
3.1		Restated Certificate of Incorporation of the Registrant (incorporated by reference to Exhibit 3.2 to the Registrant's Current Report on Form 8-K12B, filed October 30, 2017 with the SEC).
3.2		Certificate of Amendment of the Restated Certificate of Incorporation of the Registrant (incorporated by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K, filed November 28, 2017 with the SEC).
3.3		Amended and Restated By-Laws of the Registrant (incorporated by reference to Exhibit 3.3 to the Registrant's Annual Report on Form 10-K, filed March 8, 2018 with the SEC).
31.1	*	Certificate of Ribbon Communications Inc. Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	*	Certificate of Ribbon Communications Inc. Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	#	Certificate of Ribbon Communications Inc. Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	#	Certificate of Ribbon Communications Inc. Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	*	Inline XBRL Instance Document
101.SCH	*	Inline XBRL Taxonomy Extension Schema
101.CAL	*	Inline XBRL Taxonomy Extension Calculation Linkbase
101.DEF	*	Inline XBRL Taxonomy Extension Definition Linkbase
101.LAB	*	Inline XBRL Taxonomy Extension Label Linkbase
101.PRE	*	Inline XBRL Taxonomy Extension Presentation Linkbase
104	*	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

_______________________________________

*    Filed herewith.

#    Furnished herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: July 29, 2021	RIBBON COMMUNICATIONS INC.
By:	/s/ Miguel A. Lopez
	Miguel A. Lopez Executive Vice President and Chief Financial Officer (Principal Financial Officer)

59

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Bruce McClelland, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Ribbon Communications Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: July 29, 2021

/s/ Bruce McClelland

Bruce McClelland
President and Chief Executive Officer
(Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Miguel A. Lopez, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Ribbon Communications Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: July 29, 2021

/s/ Miguel A. Lopez

Miguel A. Lopez
Executive Vice President and Chief Financial Officer
(Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Ribbon Communications Inc. (the "Company") for the period ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, Bruce McClelland, President and Chief Executive Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 29, 2021

/s/ Bruce McClelland

Bruce McClelland
President and Chief Executive Officer
(Principal Executive Officer)

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Ribbon Communications Inc. (the "Company") for the period ended June 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), the undersigned, Miguel A. Lopez, Executive Vice President and Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to his knowledge:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 29, 2021

/s/ Miguel A. Lopez

Miguel A. Lopez
Executive Vice President and Chief Financial Officer
(Principal Financial Officer)

XML

Cover - shares	6 Months Ended
	Jun. 30, 2021	Jul. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-38267
Entity Registrant Name	RIBBON COMMUNICATIONS INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-1669692
Entity Address, Address Line One	6500 Chase Oaks Boulevard, Suite 100,
Entity Address, City or Town	Plano
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75023
City Area Code	978
Local Phone Number	614-8100
Title of 12(b) Security	Common Stock, par value $0.0001
Trading Symbol	RBBN
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		148,114,436
Entity Central Index Key	0001708055
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 112,155	$ 128,428
Restricted cash	2,646	7,269
Accounts receivable, net	219,867	237,738
Inventory	46,556	45,750
Other current assets	31,739	28,461
Total current assets	412,963	447,646
Property and equipment, net	49,287	48,888
Intangible assets, net	384,352	417,356
Goodwill	416,892	416,892
Investments	106,012	115,183
Deferred income taxes	10,915	10,651
Operating lease right-of-use assets	57,869	69,757
Other assets	20,698	20,892
Total assets	1,458,988	1,547,265
Current liabilities:
Current portion of term debt	20,058	15,531
Accounts payable	57,939	63,387
Accrued expenses and other	89,762	134,865
Operating lease liabilities	17,974	17,023
Deferred revenue	101,471	96,824
Total current liabilities	287,204	327,630
Long-term debt, net of current	359,333	369,035
Operating lease liabilities, net of current	62,615	72,614
Deferred revenue, net of current	22,036	26,010
Deferred income taxes	17,993	16,842
Other long-term liabilities	40,526	48,281
Total liabilities	789,707	860,412
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value per share; 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.0001 par value per share; 240,000,000 shares authorized; 148,057,301 shares issued and outstanding at June 30, 2021; 145,425,248 shares issued and outstanding at December 31, 2020	15	15
Additional paid-in capital	1,868,066	1,870,256
Accumulated deficit	(1,199,922)	(1,178,476)
Accumulated other comprehensive income (loss)	1,122	(4,942)
Total stockholders' equity	669,281	686,853
Total liabilities and stockholders' equity	1,458,988	1,547,265
Restricted cash	2,646	$ 7,269
Restricted Short-term Bank Deposits
Current assets:
Restricted cash	2,600
Restricted cash	$ 2,600

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	240,000,000	240,000,000
Common stock, shares issued (in shares)	148,057,301	145,425,248
Common stock, shares outstanding (in shares)	148,057,301	145,425,248

XML

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Total revenue	$ 211,210	$ 210,493	$ 403,982	$ 368,475
Cost of revenue:
Total cost of revenue	82,783	87,226	165,008	154,684
Gross profit	128,427	123,267	238,974	213,791
Operating expenses:
Research and development	46,797	51,796	94,207	94,091
Sales and marketing	34,881	33,898	72,099	64,869
General and administrative	12,734	15,094	28,287	32,299
Amortization of acquired intangible assets	17,181	14,669	33,004	29,003
Acquisition-, disposal- and integration-related	1,052	857	2,249	13,241
Restructuring and related	2,830	5,361	8,780	7,436
Total operating expenses	115,475	121,675	238,626	240,939
Income (loss) from operations	12,952	1,592	348	(27,148)
Interest expense, net	(3,048)	(5,400)	(8,867)	(8,795)
Other income (expense), net	17,180	(2,407)	(8,268)	(3,251)
Income (loss) before income taxes	27,084	(6,215)	(16,787)	(39,194)
Income tax provision	(3,843)	(2,036)	(4,659)	(2,227)
Net income (loss)	$ 23,241	$ (8,251)	$ (21,446)	$ (41,421)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.16	$ (0.06)	$ (0.15)	$ (0.31)
Diluted (in dollars per share)	$ 0.15	$ (0.06)	$ (0.15)	$ (0.31)
Weighted average shares used to compute earnings (loss) per share:
Basic (in shares)	147,467	144,483	146,706	132,737
Diluted (in shares)	154,160	144,483	146,706	132,737
Product
Revenue:
Total revenue	$ 113,129	$ 120,862	$ 211,018	$ 196,761
Cost of revenue:
Total cost of revenue	46,641	50,579	91,086	86,558
Service
Revenue:
Total revenue	98,081	89,631	192,964	171,714
Cost of revenue:
Total cost of revenue	$ 36,142	$ 36,647	$ 73,922	$ 68,126

XML

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 23,241	$ (8,251)	$ (21,446)	$ (41,421)
Other comprehensive (loss) income, net of tax:
Unrealized (loss) gain on interest rate swap	(205)	(3,970)	6,464	(13,497)
Foreign currency translation adjustments	(447)	70	(400)	847
Other comprehensive (loss) income, net of tax	(652)	(3,900)	6,064	(12,650)
Comprehensive income (loss), net of tax	$ 22,589	$ (12,151)	$ (15,382)	$ (54,071)

XML

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive (loss) income	ECI Telecom Group Ltd.	ECI Telecom Group Ltd. Common stock	ECI Telecom Group Ltd. Additional paid-in capital	Anova Data, Inc.	Anova Data, Inc. Common stock	Anova Data, Inc. Additional paid-in capital
Beginning balance (in shares) at Dec. 31, 2019		110,471,995
Beginning balance at Dec. 31, 2019	$ 483,255	$ 11	$ 1,747,784	$ (1,267,067)	$ 2,527
Increase (Decrease) in Stockholders' Equity
Exercise of stock options (in shares)		13,202
Exercise of stock options	23		23
Vesting of restricted stock awards and units (in shares)		1,517,552
Vesting of performance-based stock awards (in shares)		315,866
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)		(278,402)
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(808)		(808)
Shares issued as consideration in connection with acquisition (in shares)							32,500,000			316,551
Shares issued as consideration in connection with acquisition						$ 108,550	$ 3	$ 108,547	$ 1,630		$ 1,630
Stock-based compensation expense	6,198		6,198
Other comprehensive income	(12,650)				(12,650)
Net income (loss)	(41,421)			(41,421)
Ending balance (in shares) at Jun. 30, 2020		144,856,764
Ending balance at Jun. 30, 2020	544,777	$ 14	1,863,374	(1,308,488)	(10,123)
Beginning balance (in shares) at Mar. 31, 2020		144,351,304
Beginning balance at Mar. 31, 2020	553,704	$ 14	1,860,150	(1,300,237)	(6,223)
Increase (Decrease) in Stockholders' Equity
Exercise of stock options (in shares)		10,188
Exercise of stock options	18		18
Vesting of restricted stock awards and units (in shares)		500,570
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)		(5,298)
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(16)		(16)
Stock-based compensation expense	3,222		3,222
Other comprehensive income	(3,900)				(3,900)
Net income (loss)	(8,251)			(8,251)
Ending balance (in shares) at Jun. 30, 2020		144,856,764
Ending balance at Jun. 30, 2020	$ 544,777	$ 14	1,863,374	(1,308,488)	(10,123)
Beginning balance (in shares) at Dec. 31, 2020	145,425,248	145,425,248
Beginning balance at Dec. 31, 2020	$ 686,853	$ 15	1,870,256	(1,178,476)	(4,942)
Increase (Decrease) in Stockholders' Equity
Exercise of stock options (in shares)	13,602	13,602
Exercise of stock options	$ 24		24
Vesting of restricted stock awards and units (in shares)		2,465,204
Vesting of performance-based stock awards (in shares)		1,525,681
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)		(1,372,434)
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(12,064)		(12,064)
Stock-based compensation expense	9,850		9,850
Other comprehensive income	6,064				6,064
Net income (loss)	$ (21,446)			(21,446)
Ending balance (in shares) at Jun. 30, 2021	148,057,301	148,057,301
Ending balance at Jun. 30, 2021	$ 669,281	$ 15	1,868,066	(1,199,922)	1,122
Beginning balance (in shares) at Mar. 31, 2021		147,358,590
Beginning balance at Mar. 31, 2021	642,733	$ 15	1,864,107	(1,223,163)	1,774
Increase (Decrease) in Stockholders' Equity
Exercise of stock options (in shares)		213
Vesting of restricted stock awards and units (in shares)		802,576
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares)		(104,078)
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations	(831)		(831)
Stock-based compensation expense	4,790		4,790
Other comprehensive income	(652)				(652)
Net income (loss)	$ 23,241			23,241
Ending balance (in shares) at Jun. 30, 2021	148,057,301	148,057,301
Ending balance at Jun. 30, 2021	$ 669,281	$ 15	$ 1,868,066	$ (1,199,922)	$ 1,122

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ 23,241	$ (8,251)	$ (21,446)	$ (41,421)
Adjustments to reconcile net loss to cash flows provided by operating activities:
Depreciation and amortization of property and equipment			8,475	8,260
Amortization of intangible assets	17,181	14,669	33,004	29,003
Amortization of debt issuance costs			3,684	2,554
Stock-based compensation			9,850	6,198
Deferred income taxes			918	97
Gain on sale of business			(2,772)	0
Decrease in fair value of investments			9,171	0
Reduction in deferred purchase consideration			0	(69)
Foreign currency exchange losses			2,013	3,463
Changes in operating assets and liabilities:
Accounts receivable			17,360	45,422
Inventory			(1,527)	773
Other operating assets			9,874	14,282
Accounts payable			(3,508)	(41,515)
Accrued expenses and other long-term liabilities			(57,739)	9,111
Deferred revenue			673	554
Net cash provided by operating activities			8,030	36,712
Cash flows from investing activities:
Purchases of property and equipment			(10,570)	(14,891)
Business acquisitions, net of cash acquired			0	(346,852)
Proceeds from sale of business			2,944	0
Proceeds from the sale of fixed assets			0	43,500
Net cash used in investing activities			(7,626)	(318,243)
Cash flows from financing activities:
Borrowings under revolving line of credit			0	615
Principal payments on revolving line of credit			0	(8,615)
Proceeds from issuance of term debt			74,625	403,500
Principal payments of term debt			(82,147)	(52,400)
Principal payments of finance leases			(507)	(668)
Payment of debt issuance costs			(789)	(10,573)
Proceeds from the exercise of stock options			24	23
Payment of tax withholding obligations related to net share settlements of restricted stock awards			(12,064)	(808)
Net cash (used in) provided by financing activities			(20,858)	331,074
Effect of exchange rate changes on cash, cash equivalents and restricted cash			(442)	(142)
Net (decrease) increase in cash, cash equivalents and restricted cash			(20,896)	49,401
Cash, cash equivalents and restricted cash, beginning of year			135,697	44,643	$ 44,643
Cash, cash equivalents and restricted cash, end of period	$ 114,801	$ 94,044	114,801	94,044	$ 135,697
Supplemental disclosure of cash flow information:
Interest paid			8,009	6,275
Income taxes paid			9,818	4,014
Income tax refunds received			974	196
Supplemental disclosure of non-cash investing activities:
Capital expenditures incurred, but not yet paid			2,090	3,522
Common stock issued as purchase consideration			0	110,180
Supplemental disclosure of non-cash financing activities:
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested			$ 33,410	$ 5,165

XML

BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

BASIS OF PRESENTATION

BASIS OF PRESENTATION

Business

Ribbon Communications Inc. ("Ribbon" or the "Company") is a leading global provider of communications technology to service providers and enterprises. The Company provides a broad range of software and high-performance hardware products, solutions and services that enable the secure delivery of data and voice communications for residential consumers and for small, medium, and large enterprises and industry verticals such as finance, education, government, utilities and transportation. Ribbon's mission is to create a recognized global technology leader providing cloud-centric solutions that enable the secure exchange of information, with unparalleled scale, performance and elasticity. The Company is headquartered in Plano, Texas, and has a global presence with research and development, or sales and support locations in over thirty-five countries around the world.

Basis of Presentation

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting only of normal recurring items, necessary for their fair presentation with accounting principles generally accepted in the United States of America ("GAAP") and with the rules and regulations of the U.S. Securities and Exchange Commission ("SEC").

On December 1, 2020 (the "Kandy Sale Date"), American Virtual Cloud Technologies, Inc. ("AVCT") completed the purchase of the Company's cloud-based enterprise service business (the "Kandy Communications Business") and accordingly, the revenue and expenses of the Kandy Communications Business are excluded from the Company's condensed consolidated financial statements for the three and six months ended June 30, 2021.

On March 3, 2020 (the "ECI Acquisition Date"), a subsidiary of the Company merged (the "ECI Acquisition") with ECI Telecom Group Ltd ("ECI"). The financial results of ECI are included in the Company's condensed consolidated financial statements for the period subsequent to the ECI Acquisition Date.

Interim results are not necessarily indicative of results for a full year or any future interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2020 (the "Annual Report"), which was filed with the SEC on February 26, 2021.

Operating Segments

The Company's chief operating decision maker (the "CODM") is its President and Chief Executive Officer. Effective in the fourth quarter of 2020 and in connection with the ECI Acquisition, the CODM began to assess the Company's performance based on the performance of two separate organizations within Ribbon: the Cloud and Edge segment ("Cloud and Edge") and the IP Optical Networks segment ("IP Optical Networks"). Financial information for the IP Optical Networks segment included in the Company's financial results for the six months ended June 30, 2020 is for the period subsequent to the ECI Acquisition Date through June 30, 2020.

Reclassifications

In the fourth quarter of 2020, the Company reclassified amounts recorded for amortization of acquired intangible assets in prior presentations from Cost of revenue - product and Sales and marketing to a separate line included in operating expenses in the condensed consolidated statements of operations, as management believes this presentation enhances the comparability of the Company's financial statements with industry peers. These reclassifications also did not impact the condensed consolidated balance sheets or statements of cash flows for any historical periods. The Company did not reclassify depreciation of property and equipment related to production activities from cost of revenue to other accounts.

These reclassifications for the three and six months ended June 30, 2020 were as follows (in thousands):

	Three months ended June 30, 2020						Six months ended June 30, 2020
	Prior presentation		Amounts reclassified		Revised presentation		Prior presentation		Amounts reclassified		Revised presentation
Product revenue	$	120,862			$	120,862	$	196,761			$	196,761
Service revenue	89,631				89,631		171,714				171,714
Total revenue	210,493		—		210,493		368,475		—		368,475
Cost of revenue - product	61,529		(10,950)		50,579		106,462		(19,904)		86,558
Cost of revenue - service	36,647				36,647		68,126				68,126
Total cost of revenue	98,176		(10,950)		87,226		174,588		(19,904)		154,684
Total gross profit	112,317		10,950		123,267		193,887		19,904		213,791
Research and development	51,796				51,796		94,091				94,091
Sales and marketing	37,617		(3,719)		33,898		73,968		(9,099)		64,869
General and administrative	15,094				15,094		32,299				32,299
Amortization of acquired intangible assets	—		14,669		14,669		—		29,003		29,003
Acquisition-, disposal- and integration-related	857				857		13,241				13,241
Restructuring and related	5,361				5,361		7,436				7,436
Total operating expenses	110,725		10,950		121,675		221,035		19,904		240,939
Income (loss) from operations	$	1,592	$	—	$	1,592	$	(27,148)	$	—	$	(27,148)

Certain reclassifications, not affecting previously reported net loss, have been made to the previously issued financial statements to conform to the current period presentation.

Significant Accounting Policies

The Company's significant accounting policies are disclosed in Note 2 to the Consolidated Financial Statements included in the Annual Report. There were no material changes to the significant accounting policies during the three months ended June 30, 2021.

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Ribbon and its wholly-owned subsidiaries. Intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates and Judgments

The preparation of financial statements in conformity with GAAP requires Ribbon to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and judgments relied upon in preparing these condensed consolidated financial statements include accounting for business combinations, revenue recognition for multiple element arrangements, inventory valuations, assumptions used to determine the fair value of stock-based compensation, intangible asset and goodwill valuations, including impairments, legal contingencies and recoverability of Ribbon's net deferred tax assets and the related valuation allowances. Ribbon regularly assesses these estimates and records changes in estimates in the period in which they become known. Ribbon bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results could differ from those estimates.

Restricted Cash

The Company classifies as restricted cash all cash pledged as collateral to secure long-term obligations and all cash whose use is otherwise limited by contractual provisions.

At June 30, 2021, the Company had $2.6 million of restricted cash, representing restricted short-term bank deposits pledged to secure certain performance and financial bonds as security for the Company's obligations under tenders, contracts and to one of its main subcontractors.

At December 31, 2020, the Company had $7.3 million of restricted cash, comprised of $4.6 million restricted in connection with a tax payment on certain fixed assets formerly held by ECI that were sold in connection with the ECI Acquisition, and $2.7 million of restricted short-term bank deposits pledged to secure certain performance and financial bonds as security for the Company's obligations under tenders, contracts and to one of its main subcontractors.

Transfers of Financial Assets

The Company maintains customer receivables factoring agreements with a number of financial institutions primarily for IP Optical Networks sales outside of the United States. Under the terms of these agreements, the Company may transfer receivables to the financial institutions, on a non-recourse basis, provided that the financial institutions approve the receivables in advance. The Company maintains credit insurance policies from major insurance providers or obtains letters of credit from the customers for a majority of its factored trade receivables. The Company accounts for the factoring of its financial assets as a sale of the assets and records the factoring fees, when incurred, as a component of interest expense in the condensed consolidated statements of operations, and the proceeds from the sales of receivables are included in cash from operating activities in the condensed consolidated statements of cash flows. During the three and six months ended June 30, 2021, the Company received $32.1 million and $63.2 million, respectively, of cash from the sale of certain accounts receivable and recorded $0.2 million and $0.4 million, respectively, of interest expense in connection with these transactions. During the three and six months ended June 30, 2020, the Company received $30.7 million and $45.8 million, respectively, of cash from the sale of certain accounts receivable and recorded $0.3 million and $0.4 million, respectively, of interest expense in connection with these transactions.

Fair Value of Financial Instruments and Fair Value Hierarchy

The carrying amounts of the Company's financial instruments approximate their fair values and include cash equivalents, accounts receivable, borrowings under a revolving credit facility, accounts payable and long-term debt.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. The three-tier fair value hierarchy is based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:

Level 1. Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities.

Level 2. Level 2 applies to assets or liabilities for which there are inputs that are directly or indirectly observable in the marketplace, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets).

Level 3. Level 3 applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

Recent Accounting Pronouncements

The Financial Accounting Standards Board ("FASB") issued the following accounting pronouncement which became effective for the Company in 2021, and which did not have a material impact on its condensed consolidated financial statements:

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes ("ASU 2019-12"), which modifies ASC 740 to simplify the accounting for income taxes. ASU 2019-12 addresses the accounting for hybrid tax regimes, tax basis step-up in goodwill obtained in a transaction that is not a business combination, separate financial statements of legal entities not subject to tax, intraperiod tax allocation exception to incremental approach, ownership changes in investments - changes from a subsidiary to an equity method investment, ownership changes in investments - changes from an equity method investment to a subsidiary, interim period accounting for enacted changes in tax law and year-to-date loss limitation in interim period tax accounting.

The FASB issued the following accounting pronouncement, which the Company does not believe will have a material impact on its condensed consolidated financial statements upon adoption:

In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope ("ASU 2021-01"), which refines the scope of Accounting Standards Codification 848, Reference Rate Reform ("ASC 848") and clarifies some of its guidance as part of the FASB's monitoring of global reference rate reform activities. ASU 2021-01 permits entities to elect certain optional expedients and exceptions when accounting for derivative contracts and certain hedging relationships affected by changes in the interest rates used for discounting cash flows, for computing variation margin settlements, and for calculating price alignment interest in connection with reference rate reform activities under way in global financial markets (the "discounting transition"). ASU 2021-01 is effective for the Company prospectively in any period through December 31, 2022 that a modification is made to the terms of the derivatives affected by the discounting transition.

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ECI ACQUISITION

6 Months Ended

Jun. 30, 2021

Business Combination and Asset Acquisition [Abstract]

ECI ACQUISITION

ECI ACQUISITION

On the ECI Acquisition Date, Ribbon completed its previously announced merger transaction with ECI in accordance with the terms of the Agreement and Plan of Merger, dated as of November 14, 2019, by and among Ribbon, ECI, an indirect wholly-owned subsidiary of Ribbon ("Merger Sub"), Ribbon Communications Israel Ltd. and ECI Holding (Hungary) kft, pursuant to which Merger Sub merged with and into ECI, with ECI surviving such merger as a wholly-owned subsidiary of Ribbon. Prior to the ECI Acquisition Date, ECI was a privately-held global provider of end-to-end packet-optical transport and software-defined networking ("SDN") and network function virtualization ("NFV") solutions for service providers, enterprises and data center operators.

As consideration for the ECI Acquisition, Ribbon issued the ECI shareholders and certain others 32.5 million shares of Ribbon common stock with a fair value of $108.6 million (the "Stock Consideration") and paid $322.5 million of cash (the "Cash Consideration"), comprised of $183.3 million to repay ECI's outstanding debt, including both principal and interest, and $139.2 million paid to ECI's selling shareholders. In addition, ECI shareholders received $33.4 million from the sale of certain of ECI's real estate assets. Cash Consideration was financed through cash on hand and committed debt financing consisting of a new $400 million term loan facility and new $100 million revolving credit facility, which was undrawn at the ECI Acquisition Date.

The ECI Acquisition has been accounted for as a business combination and the financial results of ECI have been included in the Company's condensed consolidated financial statements for the periods subsequent to the ECI Acquisition. The Company's financial results for the three months ended June 30, 2020 included $63.6 million of revenue and $17.1 million of net loss attributable to ECI. The Company's financial results for the six months ended June 30, 2020 included $93.6 million of revenue and $20.4 million of net loss attributable to ECI for the period subsequent to the ECI Acquisition.

The Company finalized the valuation of acquired assets, identifiable intangible assets and certain assumed liabilities in the fourth quarter of 2020. A summary of the allocation of the purchase consideration for ECI is as follows (in thousands):

Fair value of consideration transferred:
Cash consideration:
Repayment of ECI outstanding debt obligations	$	183,266
Cash paid to selling shareholders	139,244
Payment to selling shareholders from sale of ECI real estate assets	33,400
Less cash and restricted cash acquired	(9,058)
Net cash consideration	346,852
Fair value of Ribbon stock issued	108,550
Fair value of total consideration	$	455,402
Fair value of assets acquired and liabilities assumed:
Current assets, net of cash and restricted cash acquired	$	120,203
Property and equipment	54,913
Intangible assets:
In-process research and development	34,000
Developed technology	111,900
Customer relationships	116,000
Trade names	3,000
Goodwill	191,996
Other noncurrent assets	37,528
Deferred revenue	(4,369)
Other current liabilities	(146,618)
Deferred revenue, net of current	(3,726)
Deferred tax liability	(13,308)
Other long-term liabilities	(46,117)
	$	455,402

The valuation of the acquired intangible assets is inherently subjective and relies on significant unobservable inputs. The Company used an income approach to value the acquired in-process research and development, developed technology, customer relationships and trade name intangible assets. The valuation for each of these intangible assets was based on estimated projections of expected cash flows to be generated by the assets, discounted to the present value at discount rates commensurate with perceived risk. The valuation assumptions take into consideration the Company's estimates of customer attrition, technology obsolescence and revenue growth projections. The Company is amortizing the identifiable intangible assets arising from the ECI Acquisition in relation to the expected cash flows from the individual intangible assets over their respective useful lives, which have a weighted average life of 12.38 years (see Note 6). Goodwill results from assets that are not separately identifiable as part of the transaction and is not deductible for tax purposes.

Pro Forma Results

The following unaudited pro forma information presents the condensed combined results of operations of Ribbon and ECI for the three and six months ended June 30, 2020 as if the ECI Acquisition had been completed on January 1, 2019, with adjustments to give effect to pro forma events that are directly attributable to the ECI Acquisition. These pro forma adjustments include an increase in research and development expense related to the conformance of ECI's cost capitalization policy to Ribbon's, additional amortization expense for the acquired identifiable intangible assets, a decrease in historical ECI interest expense reflecting the extinguishment of certain of ECI's debt as a result of the ECI Acquisition, and an increase in interest expense reflecting the new debt entered into by the Company in connection with the ECI Acquisition. Pro forma adjustments also include the elimination of acquisition-, disposal- and integration-related expenses directly attributable to the acquisition from the three and six months ended June 30, 2020 and inclusion of such costs in the comparable prior year periods.

The unaudited pro forma results do not reflect any operating efficiencies or potential cost savings that may result from the consolidation of the operations of Ribbon and ECI. Accordingly, these unaudited pro forma results are presented for illustrative

purposes and are not intended to represent or be indicative of the actual results of operations of the combined company that would have been achieved had the ECI Acquisition occurred at January 1, 2019, nor are they intended to represent or be indicative of future results of operations (in thousands, except per share amounts):

			4
	Three months ended			Six months ended
	June 30, 2020			June 30, 2020
Revenue	$	210,493		$	393,682
Net loss	$	(9,252)		$	(48,381)
Loss per share	$	(0.06)		$	(0.33)

Acquisition-, Disposal- and Integration-Related Expenses

Acquisition-related expenses include those expenses related to acquisitions that would otherwise not have been incurred by the Company, including professional and services fees, such as legal, audit, consulting, paying agent and other fees. Disposal-related expenses are professional and services fees related to disposals of subsidiaries or portions of the business. Integration-related expenses represent incremental costs related to combining the Company and its business acquisitions, such as third-party consulting and other third-party services related to merging the previously separate companies' systems and processes. The acquisition-related expenses in the three and six months ended June 30, 2020 primarily related to the ECI Acquisition. The disposal-related expenses in the six months ended June 30, 2021 relate to the Kandy Sale (as defined below).

The Company's acquisition-, disposal- and integration-related expenses for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Professional and services fees (acquisition-related)	$	143	$	640	$	143	$	13,014
Professional and services fees (disposal-related)	—		—		241		—
Integration-related expenses	909		217		1,865		227
	$	1,052	$	857	$	2,249	$	13,241

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SALE OF KANDY COMMUNICATIONS BUSINESS

6 Months Ended

Jun. 30, 2021

Discontinued Operations and Disposal Groups [Abstract]

SALE OF KANDY COMMUNICATIONS BUSINESS

SALE OF KANDY COMMUNICATIONS BUSINESS

Kandy Communications Business

On August 5, 2020, the Company announced that it had entered into a definitive agreement (as amended, the "Kandy Purchase Agreement") with AVCT to sell the Kandy Communications Business. Under the Kandy Purchase Agreement, AVCT agreed to purchase the assets and assume certain liabilities associated with the Kandy Communications Business, as well as all of the outstanding interests in Kandy Communications LLC, a subsidiary of the Company (the "Kandy Sale").

On December 1, 2020, the Company completed the Kandy Sale. The assets acquired and liabilities assumed by AVCT in connection with the Kandy Sale were primarily comprised of accounts receivable, property and equipment, trade accounts payable and employee-related accruals. As consideration, AVCT paid Ribbon $45.0 million, subject to certain adjustments, in the form of units of AVCT's securities (the "AVCT Units"), with each AVCT Unit consisting of: $1,000 in principal amount of AVCT’s Series A-1 convertible debentures (the “Debentures”); and (ii) one warrant to purchase 100 shares of AVCT common stock, $0.0001 par value (the “Warrants”), as consideration for the Kandy Sale. The Company received 43,778 AVCT Units as consideration on the Kandy Sale Date.

The Debentures bear interest at a rate of 10% per annum, which is being added to the principal amount of the Debentures, except upon maturity, in which case accrued and unpaid interest is payable in cash. The entire principal of each Debenture,

together with accrued and unpaid interest thereon, is due and payable on the earlier of the May 1, 2023 maturity date or the occurrence of a Change in Control as defined in the Kandy Purchase Agreement. Each Debenture is convertible, in whole or in part, at any time at the Company's option into that number of shares of AVCT common stock, calculated by dividing the principal amount being converted, together with all accrued and unpaid interest thereon, by the applicable conversion price, initially $3.45. The Debentures are subject to mandatory redemption if the AVCT stock price is at or above $6.00 per share for 40 trading days in any 60 consecutive trading day period, subject to the satisfaction of certain other conditions. The conversion price is subject to customary adjustments including, but not limited to, stock dividends, stock splits and reclassifications. At the Company's option, up to $5.0 million of the Debentures may be redeemed by AVCT at par in the event AVCT raises at least $50.0 million in its offering of AVCT Units. As of February 19, 2021, the stock price had traded above $6.00 for 40 days within a 60 consecutive trading day period, and accordingly, the Debentures will be converted to shares of AVCT common stock upon the completion of customary regulatory filings by AVCT.

The Warrants are independent of the Debentures and entitle the Company to purchase 4,377,800 shares of AVCT common stock at an exercise price of $0.01 per share. The Warrants expire on December 1, 2025, and were immediately exercisable on the Kandy Sale Date.

The Company had not redeemed any of the Debentures or exercised any of the Warrants as of June 30, 2021. The Company was also subject to a lock-up provision which limited the Company's ability to sell any shares of AVCT common stock underlying the Debentures and the Warrants prior to June 1, 2021, except in certain transactions.

The Company determined that the AVCT Units had a fair value of $84.9 million at the Kandy Sale Date, comprised of the Debentures with a fair value of $66.3 million and the Warrants with a fair value of $18.6 million. The value of the net assets sold to AVCT totaled $1.3 million, resulting in a gain on the sale of $83.6 million.

The Company had previously calculated the fair value of the Debentures using a Lattice-based valuation approach, which utilizes a binomial tree to model the different paths the price of AVCT's common stock might take over the Debentures' life by using assumptions regarding the stock price volatility and risk-free interest rate. These results were then used to calculate the fair value of the Debentures at each measurement date. The Company had previously used the Black-Scholes valuation model for estimating the fair value of the Warrants at each measurement date. The fair value of the Warrants was affected by AVCT's stock price as well as valuation assumptions, including the volatility of AVCT's stock price, expected term of the option, risk-free interest rate and expected dividends. Both the Lattice and Black-Scholes valuation models are based on available market data, giving consideration to all of the rights and obligations of each instrument and precluding the use of "blockage" discounts or premiums in determining the fair value of a large block of financial instruments. Upon the expiration of the lock-up period, the Company began to value the Debentures at each measurement date by multiplying the closing stock price of AVCT common stock by the number of shares upon conversion of the Debentures and Warrants.

The Company is calculating the fair value of the Debentures and Warrants at each quarter-end and recording any adjustments to the fair values in Other income (expense), net. At June 30, 2021 and December 31, 2020, the aggregate fair value of the Debentures and Warrants was $106.0 million and $115.2 million, respectively. The Company recorded a gain of $12.1 million in the three months ended June 30, 2021 and a loss of $11.8 million in the six months ended June 30, 2021 arising from the change in the fair value of the Debentures and Warrants. These amounts are included as components of Other income (expense), net, in its condensed consolidated statements of operations. The Company recorded $1.2 million and $2.7 million of interest income in the three and six months ended June 30, 2021, which was added to the principal of the Debentures, and which is included in Interest expense, net, in the condensed consolidated statements of operations. The fair values of the Debentures and Warrants are reported as Investments in the Company's condensed consolidated balance sheets at June 30, 2021 and December 31, 2020 and are classified as Level 2 fair value measurements within the fair value hierarchy (see Note 1).

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EARNINGS (LOSS) PER SHARE

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

EARNINGS (LOSS) PER SHARE

EARNINGS (LOSS) PER SHAREBasic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares outstanding during the period. For periods in which the Company reports net income, diluted net earnings per share is determined by using the weighted average number of common and dilutive common equivalent shares outstanding during the period, unless the effect is antidilutive.

The calculations of shares used to compute earnings (loss) per share were as follows (in thousands):

	Three months ended		Six months ended
	June 30, 2021	June 30, 2020	June 30, 2021	June 30, 2020
Weighted average shares outstanding - basic	147,467	144,483	146,706	132,737
Potential dilutive common shares	6,693	—	—	—
Weighted average shares outstanding - diluted	154,160	144,483	146,706	132,737

Options to purchase the Company's common stock aggregating 0.1 million have not been included in the computation of diluted earnings per share for the three months ended June 30, 2021 because their effect would have been antidilutive. Options to purchase the Company's common stock and unvested restricted and performance-based stock awards and stock units aggregating 12.1 million shares have not been included in the computation of diluted loss per share for the six months ended June 30, 2021 because their effect would have been antidilutive. Options to purchase the Company's common stock and unvested restricted and performance-based stock awards and stock units aggregating 13.7 million shares have not been included in the computation of diluted loss per share for the three and six months ended June 30, 2020 because their effect would have been antidilutive.

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INVENTORY

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

INVENTORY

INVENTORY

Inventory at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

	June 30, 2021		December 31, 2020
On-hand final assemblies and finished goods inventories	$	49,725	$	46,921
Deferred cost of goods sold	1,752		1,165
	51,477		48,086
Less noncurrent portion (included in other assets)	(4,921)		(2,336)
Current portion	$	46,556	$	45,750

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INTANGIBLE ASSETS AND GOODWILL

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS AND GOODWILL

INTANGIBLE ASSETS AND GOODWILL

The Company's intangible assets at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

June 30, 2021	Weighted average amortization period (years)	Cost		Accumulated amortization		Net carrying value
In-process research and development	*	$	34,000	$	—	$	34,000
Developed technology	7.93	306,380		162,811		143,569
Customer relationships	11.86	268,140		63,222		204,918
Trade names	3.88	5,000		3,135		1,865
Internal use software	3.00	730		730		—
	9.17	$	614,250	$	229,898	$	384,352

December 31, 2020	Weighted average amortization period (years)	Cost		Accumulated amortization		Net carrying value
In-process research and development	*	$	34,000	$	—	$	34,000
Developed technology	7.93	306,380		143,050		163,330
Customer relationships	11.86	268,140		50,627		217,513
Trade names	3.88	5,000		2,487		2,513
Internal use software	3.00	730		730		—
	9.17	$	614,250	$	196,894	$	417,356

* An in-process research and development intangible asset has an indefinite life until the product is generally available, at which time such asset is typically reclassified to developed technology.

Estimated future amortization expense for the Company's intangible assets at June 30, 2021 was as follows (in thousands):

Years ending December 31,
Remainder of 2021	$	33,621
2022	60,449
2023	53,966
2024	46,899
2025	40,338
2026	36,489
Thereafter	112,590
	$	384,352

There were no changes to the carrying value of the Company's goodwill in the six months ended June 30, 2021. The changes in the carrying value of the Company's goodwill in the six months ended June 30, 2020 were as follows (in thousands):

	Cloud and Edge		IP Optical Networks		Total
Balance at January 1, 2020*	$	224,896	$	—	$	224,896
Acquisition of ECI	—		191,996		191,996
Balance at June 30, 2020	$	224,896	$	191,996	$	416,892

(1) Balance is presented net of accumulated impairment losses of $167.4 million for the Cloud and Edge segment.

The components of goodwill at June 30, 2021 and 2020 were as follows (in thousands):

	Cloud and Edge		IP Optical Networks		Total
Balance at June 30, 2021
Goodwill	$	392,302	$	191,996	$	584,298
Accumulated impairment losses	(167,406)		—		(167,406)
	$	224,896	$	191,996	$	416,892
Balance at June 30, 2020
Goodwill	$	392,302	$	191,996	$	584,298
Accumulated impairment losses	(167,406)		—		(167,406)
	$	224,896	$	191,996	$	416,892

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ACCRUED EXPENSES AND OTHER

6 Months Ended

Jun. 30, 2021

Payables and Accruals [Abstract]

ACCRUED EXPENSES AND OTHER

ACCRUED EXPENSES AND OTHER

Accrued expenses at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

	June 30, 2021		December 31, 2020
Employee compensation and related costs	$	40,208	$	66,039
Other	49,554		68,826
	$	89,762	$	134,865

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WARRANTY ACCRUALS

6 Months Ended

Jun. 30, 2021

Guarantees and Product Warranties [Abstract]

WARRANTY ACCRUALS

WARRANTY ACCRUALS

The changes in the Company's accrual balance in the six months ended June 30, 2021 were as follows (in thousands):

Balance at January 1, 2021	$	14,855
Current period provisions	605
Settlements	(2,761)
Balance at June 30, 2021	$	12,699

Of the amounts recorded at June 30, 2021 and December 31, 2020, $5.8 million and $6.5 million, respectively, were current and included as components of Accrued expenses and other, and $6.9 million and $8.4 million, respectively, were long-term and included as components of Other long-term liabilities in the Company's condensed consolidated balance sheets.

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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES

6 Months Ended

Jun. 30, 2021

Restructuring and Related Activities [Abstract]

RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES

RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES

Restructuring and related expense includes both restructuring expense for severance and related costs and facilities-related costs, primarily comprised estimated future variable lease costs for vacated properties with no intent or ability of sublease, and accelerated rent amortization expense.

For restructuring events that involve lease assets and liabilities, the Company applies lease reassessment and modification guidance and evaluates the right-of-use assets for potential impairment. If the Company plans to exit all or distinct portions of a facility and does not have the ability or intent to sublease, the Company will accelerate the amortization of each of those lease components through the vacate date. The accelerated amortization is recorded as a component of Restructuring and related expense in the Company's condensed consolidated statements of operations. Related variable lease expenses will continue to be expensed as incurred through the vacate date, at which time the Company will reassess the liability balance to ensure it appropriately reflects the remaining liability associated with the premises and record a liability for the estimated future variable lease costs.

Restructuring and related expense for the three and six months ended June 30, 2021 and 2020 was comprised of the following (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Severance and related costs	$	1,926	$	4,716	$	2,595	$	6,487
Variable and other facilities-related costs	904		$	645	2,817		879
Accelerated amortization of lease assets due to cease-use	—		$	—	3,368		70
	$	2,830	$	5,361	$	8,780	$	7,436

Accelerated Rent Amortization

Accelerated rent amortization is recognized from the date that the Company commences the plan to fully or partially vacate

a facility, for which there is no intent or ability to enter into a sublease, through the final vacate date. The accelerated rent amortization recorded in connection with the Facilities Initiative reduced the value of the Company's Operating lease right-of-use assets recorded in the Company's condensed consolidated balance sheets at June 30, 2021 and December 31, 2020, respectively. The liability for the total lease payments for each respective facility is included as a component of Operating lease liabilities in the Company's condensed consolidated balance sheets, both current and noncurrent (see Note 17). The Company may incur additional future expense if it is unable to sublease other locations included in its restructuring initiatives.

2020 Restructuring Initiative

In 2020, the Company implemented a restructuring plan to eliminate certain positions and redundant facilities, primarily in connection with the ECI Acquisition, to further streamline the Company's global footprint and improve its operations (the "2020 Restructuring Initiative"). In connection with this initiative, the Company expects to eliminate duplicate functions arising from the ECI Acquisition and support its efforts to integrate the two companies.

The Company recorded restructuring and related expense of $1.9 million and $4.7 million in connection with the 2020 Restructuring Initiative in the three months ended June 30, 2021 and 2020, respectively, and $2.3 million and $5.8 million in the six months ended June 30, 2021 and 2020, respectively.

The amount recorded in the three months ended June 30, 2021 was comprised of $1.9 million for severance and related costs for approximately 15 employees and nominal expense for variable costs related to restructured facilities. The amount recorded in the six months ended June 30, 2021 was comprised of $2.6 million for severance and related costs for approximately 25 employees and $0.4 million of expense for variable costs related to restructured facilities, offset by a credit of $0.7 million for changes in estimate to previously recorded facilities-related amounts. The amount recorded in the six months ended June 30, 2020 represents severance and related costs for approximately 75 employees, of which $4.7 million was recorded in the three months ended June 30, 2020 and $1.1 million was recorded in the three months ended March 31, 2020. The Company expects the amount accrued for severance at June 30, 2021 will be paid in 2021. The Company expects that it will record additional restructuring and related expense approximating $2 million under the 2020 Restructuring Initiative in the aggregate for severance and planned facility consolidations. A summary of the 2020 Restructuring Initiative accrual activity for severance and related costs for the six months ended June 30, 2021 is as follows (in thousands):

	Balance at January 1, 2021		Initiatives charged to expense		Adjustments for changes in estimate		Cash payments		Balance at June 30, 2021
Severance	$	5,237	$	2,595	$	—	$	(4,178)	$	3,654
Facilities	1,256		382		(670)		(949)		19
	$	6,493	$	2,977	$	(670)	$	(5,127)	$	3,673

2019 Restructuring and Facilities Consolidation Initiative

In June 2019, the Company implemented a restructuring plan to further streamline the Company's global footprint, improve its operations and enhance its customer delivery (the "2019 Restructuring Initiative"). The 2019 Restructuring Initiative includes facility consolidations, refinement of the Company's research and development activities, and a reduction in workforce. The facility consolidations under the 2019 Restructuring Initiative (the "Facilities Initiative") include a consolidation of the Company's North Texas sites into a single campus, housing engineering, customer training and support, and administrative functions, as well as a reduction or elimination of certain excess and duplicative facilities worldwide. In addition, the Company is substantially consolidating its global software laboratories and server farms into two lower cost North American sites. The Company continues to evaluate its properties included in the Facilities Initiative for accelerated amortization and/or right-of-use asset impairment. The Company expects that the actions under the Facilities Initiative will be completed in 2021.

In connection with the 2019 Restructuring Initiative, the Company recorded restructuring and related expense of $0.9 million and $0.7 million in the three months ended June 30, 2021 and 2020, respectively, and $6.5 million and $1.7 million in the six months ended June 30, 2021 and 2020, respectively.

The amount recorded in the three months ended June 30, 2021 related to variable facilities costs. Of the amount recorded in the six months ended June 30, 2021, $3.4 million was for accelerated amortization of lease assets and $3.1 million related to variable and other facilities-related costs in connection with facility consolidations. The amount recorded in the three months ended June 30, 2020 primarily related to facility consolidations. The amount recorded in the six months ended June 30, 2020 was comprised of $0.7 million for severance and related costs for five employees and $1.0 million related to facility consolidations. As of June 30, 2021, the amounts accrued for severance and related costs had been paid in full. The Company estimates that it will record nominal, if any, additional restructuring and related expense in connection with this initiative.

A summary of the 2019 Restructuring Initiative accrual activity for the six months ended June 30, 2021 is as follows (in thousands):

	Balance at January 1, 2021		Initiatives charged to expense		Reclassify accelerated amortization to operating lease liabilities		Cash payments		Balance at June 30, 2021
Severance	$	173	$	—	$	—	$	(173)	$	—
Facilities	766		6,473		(3,368)		(1,943)		1,928
	$	939	$	6,473	$	(3,368)	$	(2,116)	$	1,928

Balance Sheet Classification

The current portions of accrued restructuring are included as a component of Accrued expenses and the long-term portions of accrued restructuring are included as a component of Other long-term liabilities in the condensed consolidated balance sheets. The long-term portions of accrued restructuring relate to facilities and totaled $1.9 million at June 30, 2021 and $0.8 million at December 31, 2020.

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DEBT

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

DEBT

DEBT

2020 Credit Facility

On March 3, 2020, the Company entered into a Senior Secured Credit Facilities Credit Agreement (as amended, the "2020 Credit Facility"), by and among the Company, as a guarantor, Ribbon Communications Operating Company, Inc., as the borrower ("Borrower"), Citizens Bank, N.A. ("Citizens"), as administrative agent, a lender, issuing lender, swingline lender, joint lead arranger and bookrunner, Santander Bank, N.A., as a lender, joint lead arranger and bookrunner, and the other lenders party thereto (each, together with Citizens Bank, N.A. and Santander Bank, N.A., referred to individually as a "Lender", and collectively, the "Lenders"). The proceeds of the 2020 Credit Facility were used, in part, to pay off in full all obligations of the Company under its prior credit facility (the "2019 Credit Facility").

The 2020 Credit Facility provides for $500 million of commitments from the lenders to the Borrower, comprised of $400 million in term loans (the "2020 Term Loan Facility") and a $100 million facility available for revolving loans (the "2020 Revolving Credit Facility"). Under the 2020 Revolving Credit Facility, a $30 million sublimit is available for letters of credit and a $20 million sublimit is available for swingline loans. Under the 2020 Credit Facility, the Company was originally required to make quarterly principal payments aggregating approximately $10 million in the first year, $20 million per year for the following three years, and $30 million in the last year, with the remaining balance due on the maturity date. The 2020 Credit Facility also requires periodic interest payments until maturity.

The indebtedness and other obligations under the 2020 Credit Facility are unconditionally guaranteed on a senior secured basis by the Company, Edgewater Networks, Inc., a wholly-owned subsidiary of the Company, and GENBAND Inc., a wholly-owned subsidiary of the Company (together, the "Guarantors"). The facilities under the 2020 Credit Facility are secured by first-priority liens on substantially all of the assets of the Borrower and the Guarantors, including substantially all of the assets of the Company.

The 2020 Credit Facility requires compliance with certain financial covenants, including a minimum Consolidated Fixed Charge Coverage Ratio and a maximum Consolidated Net Leverage Ratio (each as defined in the 2020 Credit Facility, and each tested on a quarterly basis).

In addition, the 2020 Credit Facility contains various covenants that, among other restrictions, limit the Company’s and its subsidiaries’ ability to incur or assume indebtedness; grant or assume liens; make acquisitions or engage in mergers; sell, transfer, assign or convey assets; repurchase equity and make dividend and certain other restricted payments; make investments; engage in transactions with affiliates; enter into sale and leaseback transactions; enter into burdensome agreements; change the nature of its business; modify their organizational documents; and amend or make prepayments on certain junior debt.

The 2020 Credit Facility contains events of default that are customary for a secured credit facility. If an event of default relating to bankruptcy or other insolvency events with respect to the Company or any of its subsidiaries occurs, all obligations under the 2020 Credit Facility will immediately become due and payable. If any other event of default occurs under the 2020 Credit Facility, the lenders may accelerate the maturity of the obligations outstanding under the Credit Facility and exercise other rights and remedies, including charging a default rate of interest equal to 2.00% per year above the rate that would otherwise be applicable. In addition, if any event of default exists under the 2020 Credit Facility, the lenders can commence foreclosure or other actions against the collateral.

On August 18, 2020 (the "First Amendment Effective Date"), the Borrower entered into a First Amendment to the 2020 Credit Facility (the "First Amendment"). Pursuant to an assignment and assumption agreement entered into by Citizens and certain affiliates of Whitehorse Capital on the First Amendment Effective Date (collectively, "HIG Whitehorse"), and consented to by Citizens and the Borrower, $75 million of the 2020 Term Loan Facility, designated as the Term B Loan (the "Term B Loan"), was assigned from Citizens to HIG Whitehorse. The remaining $325 million of the 2020 Term Loan Facility that was not assigned to HIG Whitehorse was deemed the Term A Loan (the "Term A Loan" and, together with the Term B Loan, the "Amended 2020 Term Loan Facility").

The Term A Loan and the 2020 Revolving Credit Facility mature in March 2025. The Term A Loan and 2020 Revolving Credit Facility bear interest at the Borrower's option at either the LIBOR rate plus a margin ranging from 1.50% to 3.50% per year, or the base rate (the highest of the Federal Funds Effective Rate (as defined in the 2020 Credit Facility) plus 0.50%, or the prime rate announced from time to time in The Wall Street Journal) plus a margin ranging from 0.50% to 2.50% per year (the "Applicable Margin"). The Applicable Margin varies depending on the Company's Consolidated Net Leverage Ratio (as defined in the 2020 Credit Agreement). The base rate and the LIBOR rate are each subject to a zero percent floor. The Company was required to make quarterly principal payments on the Term A Loan aggregating approximately $10 million in the first year, $16 million per year in each of the next two years, $20 million in the fourth year and $16 million in the last year, with the final payment approximating $244 million due on the maturity date. The Borrower could prepay all amounts under the Term A Loan and the 2020 Revolving Credit Facility at any time without premium or penalty (other than customary LIBOR breakage costs), subject to certain notice requirements.

The Term B Loan was scheduled to mature in March 2026 and bore interest, at the Borrower's option, at either the LIBOR rate plus a margin of 7.50% per year, or the base rate (the highest of the Federal Funds Effective Rate (as defined in the First Amendment) plus 0.50%, or the prime rate announced from time to time in The Wall Street Journal, plus a margin of 6.50% per year. The Term B Loan had a lower rate of amortization than the Term A Loan and was subject to a 1.0% premium if voluntarily repaid in connection with a repricing transaction (as defined in the 2020 Credit Facility) occurring prior to the six month anniversary of the First Amendment Effective Date. The Company was required to make quarterly principal payments totaling approximately $1 million in the first year and $8 million in the aggregate over the next four and a half years, with the final payment approximating $66 million.

The First Amendment reduced the Borrower's ability to incur new tranches of term loans, or increases in commitments under the Amended 2020 Term Loan Facility or the 2020 Revolving Credit Facility. Specifically, such indebtedness could be incurred up to an aggregate dollar amount equal to 75% of the Company's Consolidated Adjusted EBITDA (as defined in the 2020 Credit Facility), reduced from 100% prior to the First Amendment, as of the most recently ended fiscal quarter for which financial statements had been delivered to the lenders, plus additional amounts, so long as the Borrower's Consolidated Net Leverage Ratio (as defined in the 2020 Credit Agreement) did not exceed 2.25:1.00, reduced from 2.75:1.00 under the 2020

Credit Agreement. The First Amendment also reduced the amount of Unrestricted Cash (as defined in the 2020 Credit Agreement) used in calculating the Borrower's Consolidated Net Leverage Ratio from $25 million to $10 million.

On December 1, 2020, the Borrower entered into a Second Amendment to the 2020 Credit Facility to obtain consent for an equity exchange with AVCT in connection with the Kandy Sale, as well as to amend certain other provisions of the 2020 Credit Facility.

At December 31, 2020, the Company had an outstanding Term A Loan balance of $318.5 million at an average interest rate of 3.4%, and an outstanding Term B Loan balance of $74.6 million at an average interest rate of 8.4%. The 2020 Revolving Credit Facility did not have an outstanding balance but had $5.6 million of letters of credit outstanding with an interest rate of 2.5%.

On March 3, 2021 (the "Third Amendment Effective Date"), the Company, the Borrower and certain of its subsidiaries entered into a Third Amendment to Credit Agreement (the "Third Amendment"), which further amended the 2020 Credit Facility. The Third Amendment provided for an incremental term loan facility to the Borrower in the original principal amount of $74.6 million, the proceeds of which were used on the Third Amendment Effective Date to consummate an open market purchase of all outstanding amounts under the Term B Loan. Upon the consummation of the open market purchase, the Term B Loans were assigned to the Borrower and immediately cancelled, such that the outstanding amount under the Term A Loan and incremental term loan facility were combined and held by the Lenders (the "2020 Term Loan") with the same terms as the Term A Loan. The Company wrote off $2.5 million of capitalized debt issuance costs in connection with the Third Amendment, which is included in Interest expense, net, in the Company's condensed consolidated statement of operations for the six months ended June 30, 2021. The Company is required to make quarterly principal payments on the 2020 Term Loan aggregating approximately $20 million per year in the first three years and $30 million in the fourth year, with the final payment approximating $300 million due on the maturity date.

The Third Amendment increased the Borrower's ability to incur new incremental revolving commitments or term loans. Such indebtedness can be incurred up to an aggregate dollar limit equal to 100% of the Company's Consolidated Adjusted EBITDA (as defined in the 2020 Credit Facility) as of the most recently ended fiscal quarter for which financial statements have been delivered to the Lenders, plus additional amounts, so long as the Borrower's Consolidated Net Leverage Ratio (as defined in the Credit Agreement) does not exceed 2.75:1.00, increased from 2.25:1.00 under the First Amendment. The Third Amendment also increased the amount of Unrestricted Cash (as defined in the 2020 Credit Facility) used in calculating the Borrower's Consolidated Net Leverage Ratio from $10.0 million to $25.0 million.

At June 30, 2021, the Company had an outstanding 2020 Term Loan balance of $385.5 million at an average interest rate of 3.40% and $6.4 million of letters of credit outstanding with an interest rate of 2.50%.

The Company was in compliance with all covenants of the 2020 Credit Facility at both June 30, 2021 and December 31, 2020.

Short-Term Loans

From time to time, the Company enters into uncommitted and unsecured short-term loans to finance exports in China. The Company did not have any such short-term loans outstanding at June 30, 2021 and December 31, 2020.

Letters of Credit and Performance and Bid Bonds

The Company uses letters of credit, performance and bid bonds in the course of its business. At June 30, 2021, the Company had bank guarantees, performance and bid bonds under various uncommitted facilities (collectively, the "Guarantees") aggregating $24.9 million and $6.4 million of letters of credit under the 2020 Credit Facility (the "Letters of Credit"). At December 31, 2020, the Company had Guarantees aggregating $27.0 million and $5.6 million of Letters of Credit. At June 30, 2021 and December 31, 2020, the Company had cash collateral of $2.6 million and $2.7 million, respectively, supporting the Guarantees, which are included in Restricted cash in the condensed consolidated balance sheets.

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

The Company is exposed to financial market risk related to foreign currency fluctuations and changes in interest rates. These exposures are actively monitored by management. To manage the volatility related to the exposure to changes in interest rates, the Company has entered into a derivative financial instrument. Management's objective is to reduce, where it is deemed appropriate to do so, fluctuations in earnings and cash flows associated with changes in interest rates. Ribbon's policies and practices are to use derivative financial instruments only to the extent necessary to manage exposures. Ribbon does not hold or issue derivative financial instruments for trading or speculative purposes.

The Company records derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a specific risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Derivatives may also be designated as hedges of the foreign currency exposure of a net investment in a foreign operation. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge, or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risk even though hedge accounting does not apply or the Company elects not to apply hedge accounting.

Cash Flow Hedge of Interest Rate Risk

The 2020 Term Loan Facility had outstanding balances of $385.5 million and $393.1 million at June 30, 2021 and December 31, 2020, respectively. The 2020 Revolving Credit Facility was undrawn at both June 30, 2021 and December 31, 2020. Borrowings under the 2020 Credit Facility have variable interest rates based on LIBOR (see Note 10). As a result of exposure to interest rate movements, during March 2020, the Company entered into an interest rate swap arrangement, which effectively converted its $400 million term loan with its variable interest rate based upon one-month LIBOR to an aggregate fixed rate of 0.904%, plus a leverage-based margin as defined in the 2020 Credit Facility. The notional amount of this swap at June 30, 2021 was $400 million, and the swap matures on March 3, 2025, the same date the 2020 Credit Facility matures.

The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company is using an interest rate swap as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.

The effective portion of changes in the fair value of designated derivatives that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) in the condensed consolidated balance sheet and is subsequently reclassified into earnings in the period that the hedged forecasted transactions affect earnings. During the three and six months ended June 30, 2021 and 2020, such a derivative was used to hedge the variable cash flows associated with the outstanding borrowings under the 2020 Credit Facility and the Company has accounted for this derivative as an effective hedge. Any ineffective portion of the change in the fair value of the derivative would be recognized directly in earnings.

Amounts reported in accumulated other comprehensive income (loss) related to the Company's derivative are reclassified to interest expense as interest is accrued on the Company’s variable-rate debt. Based upon projected forward rates, the Company estimates as of June 30, 2021 that $3.2 million may be reclassified as an increase to interest expense over the next twelve months.

The impact of the Company’s derivative financial instrument on its condensed consolidated statement of comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion)	$	(1,015)	$	(4,320)	$	4,875	$	(13,657)
Amount reclassified from accumulated other comprehensive income (loss) to interest expense (effective portion)	810		350		1,589		160
	$	(205)	$	(3,970)	$	6,464	(13,497)

The fair values and locations in the condensed consolidated balance sheets at June 30, 2021 and December 31, 2020 of the Company's derivative liability designated as a hedging instrument were as follows (in thousands):

	Balance sheet location	June 30, 2021		December 31, 2020
Interest rate derivative - liability derivative	Accrued expenses and other	$	3,172	$	3,157
Interest rate derivative - liability derivative	Other long-term liabilities	$	1,312	$	7,791

The Company has classified the interest rate derivative aggregating $4.5 million and $10.9 million at June 30, 2021 and December 31, 2020, respectively, as Level 2 fair value measurements within the fair value hierarchy (see Note 1).

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REVENUE RECOGNITION

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

REVENUE RECOGNITION

The Company derives revenue from two primary sources: products and services. Product revenue includes the Company's hardware and software that function together to deliver the products' essential functionality. Software and hardware are also sold on a standalone basis. Services include customer support (software updates, upgrades and technical support), consulting, design services, installation services and training. Generally, contracts with customers contain multiple performance obligations, consisting of products and services. For these contracts, the Company accounts for individual performance obligations separately if they are considered distinct.

When an arrangement contains more than one performance obligation, the Company will allocate the transaction price to each performance obligation on a relative standalone selling price basis. The Company utilizes the observable price of goods and services when they are sold separately to similar customers in order to estimate standalone selling price.

The Company's software licenses typically provide a perpetual right to use the Company's software. The Company also sells term-based software licenses that expire and Software-as-a-Service ("SaaS")-based software which are referred to as subscription arrangements. The Company does not customize its software nor are installation services required, as the customer has a right to utilize internal resources or a third-party service company. The software and hardware are delivered before related services are provided and are functional without professional services or customer support. The Company has concluded that its software licenses are functional intellectual property that are distinct, as the user can benefit from the software on its own. Product revenue is typically recognized upon transfer of control or when the software is made available for download, as this is the point the user of the software can direct the use of, and obtain substantially all of the remaining benefits from, the functional intellectual property. The Company begins to recognize software revenue related to the renewal of subscription software licenses at the start of the subscription period.

The Company offers warranties on its products. Certain of the Company's warranties are considered to be assurance-type in nature, ensuring the product is functioning as intended. Assurance-type warranties do not represent separate performance obligations. The Company also sells separately-priced maintenance service contracts which qualify as service-type warranties and represent separate performance obligations. The Company does not allow and has no history of accepting product returns.

Services revenue includes revenue from customer support and other professional services. Customer support includes software updates on a when-and-if-available basis, telephone support, integrated web-based support and bug fixes or patches. The Company sells its customer support contracts at a percentage of list or net product price. Customer support revenue is recognized ratably over the term of the customer support agreement, which is typically one year.

The Company's professional services include consulting, technical support, resident engineer services, design services and installation services. Because control transfers over time, revenue is recognized based on progress toward completion of the performance obligation. The method to measure progress toward completion requires judgment and is based on the nature of the products or services to be provided. The Company generally uses the input method to measure progress for its contracts because it believes such method best depicts the transfer of assets to the customer, which occurs as the Company incurs costs for the contracts. However, in some instances, the Company uses the output method because it best depicts the transfer of asset to the customer. Under the cost-to-cost measure of progress, the progress toward completion is measured based on the ratio of costs incurred to date to the total estimated costs at completion of the performance obligation. When the measure of progress is based upon expended labor, progress toward completion is measured as the ratio of labor time expended to date versus the total estimated labor time required to complete the performance obligation. Revenue is recorded proportionally as costs are incurred or as labor is expended. Costs to fulfill these obligations include internal labor as well as subcontractor costs.

Customer training includes courses offered by the Company. The related revenue is typically recognized as the training services are performed.

The Company's typical performance obligations include the following:

Performance Obligation	When Performance Obligation is Typically Satisfied	When Payment is Typically Due
Software and Product Revenue
Software licenses (perpetual or term)	Upon transfer of control; typically, when made available for download (point in time)	Generally, within 30 days of invoicing except for term licenses, which may be paid for over time
Software licenses (subscription)	Upon activation of hosted site (over time)	Generally, within 30 days of invoicing
Hardware	When control of the hardware passes to the customer; typically, upon delivery (point in time)	Generally, within 30 days of invoicing
Software upgrades	Upon transfer of control; typically, when made available for download (point in time)	Generally, within 30 days of invoicing
Customer Support Revenue
Customer support	Ratably over the course of the support contract (over time)	Generally, within 30 days of invoicing
Professional Services
Other professional services (excluding training services)	As work is performed (over time)	Generally, within 30 days of invoicing (upon completion of services)
Training	When the class is taught (point in time)	Generally, within 30 days of services being performed

Significant Judgments

The Company's contracts with customers often include promises to transfer multiple products and services to the customer. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment.

Judgment is required to determine the standalone selling price ("SSP") for each distinct performance obligation. The Company typically has more than one SSP for individual products and services due to the stratification of those products and services by customers and circumstances. In these instances, the Company may use information such as the size of the customer and geographic region in determining the SSP.

Deferred Revenue

Deferred revenue is a contract liability representing amounts collected from or invoiced to customers in excess of revenue recognized. This results primarily from the billing of annual customer support agreements where the revenue is recognized over the term of the agreement. The value of deferred revenue will increase or decrease based on the timing of recognition of revenue.

Disaggregation of Revenue

The Company disaggregates its revenue from contracts with customers based on the nature of the products and services and the geographic regions in which each customer is domiciled. The Company's revenue for the three and six months ended June 30, 2021 and 2020 was disaggregated as follows:

Three months ended June 30, 2021	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	56,128	$	32,816	$	11,590	$	100,534
Europe, Middle East and Africa	31,309		20,739		7,741		59,789
Asia Pacific	19,045		10,837		3,868		33,750
Other	6,647		8,045		2,445		17,137
	$	113,129	$	72,437	$	25,644	$	211,210

Three months ended June 30, 2020	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	57,112	$	33,651	$	10,844	$	101,607
Europe, Middle East and Africa	35,801		19,512		4,772		60,085
Asia Pacific	21,854		7,023		3,956		32,833
Other	6,095		8,437		1,436		15,968
	$	120,862	$	68,623	$	21,008	$	210,493

Six months ended June 30, 2021	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	92,940	$	64,422	$	22,752	$	180,114
Europe, Middle East and Africa	59,517		40,394		14,651		114,562
Asia Pacific	44,627		20,585		9,671		74,883
Other	13,934		15,741		4,748		34,423
	$	211,018	$	141,142	$	51,822	$	403,982

Six months ended June 30, 2020	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	93,477	$	65,117	$	21,410	$	180,004
Europe, Middle East and Africa	56,166		34,322		8,787		99,275
Asia Pacific	36,797		14,534		8,834		60,165
Other	10,321		15,718		2,992		29,031
	$	196,761	$	129,691	$	42,023	$	368,475

The Company's product revenue from indirect sales through its channel partner program and from its direct sales program for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Indirect sales through channel partner program	$	27,114	$	32,649	$	47,277	$	61,253
Direct sales	86,015		88,213		163,741		135,508
	$	113,129	$	120,862	$	211,018	$	196,761

The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Sales to enterprise customers	$	24,522	$	35,950	$	47,190	$	63,231
Sales to service provider customers	88,607		84,912		163,828		133,530
	$	113,129	$	120,862	$	211,018	$	196,761

The Company's product revenue and service revenue components by segment for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Product revenue
Cloud and Edge	$	64,361	$	72,310	$	114,513	$	126,520
IP Optical Networks	48,768		48,552		96,505		70,241
Total product revenue	$	113,129	$	120,862	$	211,018	$	196,761
Service revenue
Maintenance
Cloud and Edge	$	57,986	$	57,853	$	112,659	$	113,409
IP Optical Networks	14,451		10,770		28,483		16,282
Total maintenance revenue	72,437		68,623		141,142		129,691
Professional services
Cloud and Edge	19,074		16,744		39,671		35,009
IP Optical Networks	6,570		4,264		12,151		7,014
Total professional services revenue	25,644		21,008		51,822		42,023
Total service revenue	$	98,081	$	89,631	$	192,964	$	171,714

Revenue Contract Balances

The timing of revenue recognition, billings and cash collections results in billed accounts receivable; unbilled receivables, which are contract assets; and customer advances and deposits, which are contract liabilities, in the Company's condensed consolidated balance sheets. Amounts are billed as work progresses in accordance with agreed-upon contractual terms, either at periodic intervals or upon achievement of contractual milestones. Completion of services and billing may occur subsequent to revenue recognition, resulting in contract assets. The Company may receive advances or deposits from its customers before revenue is recognized, resulting in contract liabilities that are classified as deferred revenue. These assets and liabilities are reported in the Company's condensed consolidated balance sheets on a contract-by-contract basis as of the end of each reporting period. Changes in the contract asset and liability balances during the six months ended June 30, 2021 were not materially impacted by any factors other than billing and revenue recognition. Nearly all of the Company's deferred revenue balance is related to services revenue, primarily customer support contracts. Unbilled receivables stem primarily from engagements where services have been performed; however, billing cannot occur until services are completed.

In some arrangements, the Company allows customers to pay for term-based software licenses and products over the term of the software license. The Company also sells SaaS-based software under subscription arrangements, with payment terms over the term of the SaaS agreement. Amounts recognized as revenue in excess of amounts billed are recorded as unbilled receivables. Unbilled receivables that are anticipated to be invoiced in the next twelve months are included in Accounts receivable on the Company's condensed consolidated balance sheets. The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the six months ended June 30, 2021 were as follows (in thousands):

	Accounts receivable		Unbilled accounts receivable		Deferred revenue (current)		Deferred revenue (long-term)
Balance at January 1, 2021	$	179,331	$	58,407	$	96,824	$	26,010
Increase (decrease), net	(16,223)		(1,648)		4,647		(3,974)
Balance at June 30, 2021	$	163,108	$	56,759	$	101,471	$	22,036

The Company recognized approximately $60 million of revenue in the six months ended June 30, 2021 that was recorded as deferred revenue at December 31, 2020 and approximately $69 million of revenue in the six months ended June 30, 2020 that was recorded as deferred revenue at December 31, 2019. Of the Company's deferred revenue reported as long-term in its condensed consolidated balance sheet at June 30, 2021, the Company expects that approximately $12 million will be

recognized as revenue in 2022, approximately $6 million will be recognized as revenue in 2023 and approximately $4 million will be recognized as revenue in 2024 and beyond.

All freight-related customer invoicing is recorded as revenue, while the shipping and handling costs that occur after control of the promised goods or services transfer to the customer are reported as fulfillment costs, a component of Cost of revenue - product in the Company's condensed consolidated statements of operations.

Deferred Commissions Cost

Sales commissions earned by the Company's employees are considered incremental and recoverable costs of obtaining a contract with a customer. Expense related to commission payments has been deferred on our condensed consolidated balance sheet and is being amortized over the expected life of the customer contract, which averages five years. The current and long-term portions of deferred commission expense are included as components of Other current assets and Other assets, respectively. At both June 30, 2021 and December 31, 2020, the Company had $4.1 million of deferred sales commissions capitalized.

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OPERATING SEGMENT INFORMATION

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

OPERATING SEGMENT INFORMATION

OPERATING SEGMENT INFORMATION

The Company has two reportable segments, which are intended to align with the manner in which the business is managed: Cloud and Edge, and IP Optical Networks.

The Cloud and Edge segment provides secure and reliable software and hardware products, solutions and services for enabling Voice over Internet Protocol ("VoIP") communications, Voice over Long-Term Evolution ("VoLTE") and Voice Over 5G ("VoNR") communications and Unified Communications and Collaboration ("UC&C") within service provider and enterprise networks and from the cloud. The Cloud and Edge products are increasingly software-centric and cloud-native for deployment on private, public or hybrid cloud infrastructures, in data centers, on enterprise premises and within service provider networks. Ribbon's Cloud and Edge product portfolio consists of our Session Border Controller ("SBC") products and our Network Transformation ("NTR") products.

The IP Optical Networks segment provides high-performance, secure and reliable hardware and software products solutions for IP networking, switching, routing and optical transport designed to support and enable technologies like 5G, distributed cloud computing and corresponding applications by delivering ultra-low cost-per-bit transport and multi-service flexibility. The IP Optical Networks portfolio offers multiple solutions, including 5G-native solutions for mobile backhaul, metro and edge aggregation, core networking, data center interconnect, legacy NTR and transport solutions for wholesale carriers. This portfolio is offered to service provider, enterprise and industry verticals with critical transport network infrastructures including utilities, government, defense, transportation, and education and research Information for the IP Optical Networks segment for the six months ended June 30, 2020 includes the financial results of this segment for the period subsequent to the ECI Acquisition Date.

The Company has not provided segment asset information as such information is not provided to the CODM and accordingly, asset information is not used in assessing segment performance. Please see Note 6 for information regarding the allocation of goodwill between segments. Segment revenue and expenses included in the tables below represent direct revenue and expenses attributable to each segment for revenue, adjusted gross profit, and the research and development expense component of adjusted EBITDA. The Company's sales, marketing, and general and administrative functions support both segments and accordingly, these costs are allocated to both segments.

The CODM utilizes revenue, adjusted gross profit and adjusted EBITDA (earnings before interest, taxes, depreciation and amortization) to measure and assess each segment's performance. The Company calculates adjusted EBITDA by excluding from income (loss) from operations: depreciation; amortization of acquired intangible assets; stock-based compensation; certain litigation costs; acquisition-, disposal- and integration-related expense; and restructuring and related expense. These adjusted measures may also exclude other items in future periods that the Company believes are not part of the Company's core business. Adjusted gross profit and adjusted EBITDA are not financial measures determined in accordance with U.S. GAAP and may not be comparable to similarly titled measures used by other companies and should not be considered a substitute for income (loss)

from operations or gross profit or other results reported in accordance with U.S. GAAP. See below for a reconciliation of adjusted gross profit to gross profit and adjusted EBITDA to income (loss) from operations, as those are the most directly comparable U.S. GAAP measures.

The tables below provide information regarding revenue, adjusted gross profit, adjusted EBITDA and depreciation expense by reportable segment for the three and six months ended June 30, 2021 and 2020 (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment revenue:
Cloud and Edge	$	141,421	$	146,907	$	266,843	$	274,938
IP Optical Networks	69,789		63,586		137,139		93,537
Revenue	$	211,210	$	210,493	$	403,982	$	368,475

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment adjusted gross profit:
Cloud and Edge	$	95,837	$	98,779	$	180,172	$	177,714
IP Optical Networks	33,152		24,686		59,626		36,432
Total segment adjusted gross profit	128,989		123,465		239,798		214,146
Stock-based compensation expense	(562)		(198)		(824)		(355)
Gross profit	$	128,427	$	123,267	$	238,974	$	213,791

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment adjusted EBITDA:
Cloud and Edge	$	43,536	$	37,497	$	71,866	$	47,236
IP Optical Networks	(482)		(7,947)		(9,160)		(8,145)
Total segment adjusted EBITDA	43,054		29,550		62,706		39,091
Depreciation	(4,249)		(4,786)		(8,475)		(8,260)
Amortization of intangible assets	(17,181)		(14,669)		(33,004)		(29,003)
Stock-based compensation	(4,790)		(3,222)		(9,850)		(6,198)
Litigation costs	—		937		—		(2,101)
Acquisition-, disposal- and integration-related expense	(1,052)		(857)		(2,249)		(13,241)
Restructuring and related expense	(2,830)		(5,361)		(8,780)		(7,436)
Income (loss) from operations	12,952		1,592		$	348	$	(27,148)
Segment depreciation expense:
Cloud and Edge	$	3,142	$	2,984	$	6,279	$	5,977
IP Optical Networks	1,107		1,802		2,196		2,283
Depreciation expense	$	4,249	$	4,786	$	8,475	$	8,260

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MAJOR CUSTOMERS

6 Months Ended

Jun. 30, 2021

Risks and Uncertainties [Abstract]

MAJOR CUSTOMERS

MAJOR CUSTOMERS

The following customer contributed 10% or more of the Company's revenue in the three and six months ended June 30, 2021 and 2020:

	Three months ended		Six months ended
	June 30, 2021	June 30, 2020	June 30, 2021	June 30, 2020
Verizon Communications Inc.	17%	15%	16%	14%

At June 30, 2021, one customer accounted for 10% or more of the Company's accounts receivable balance, representing approximately 17% of total accounts receivable. At December 31, 2020, one customer accounted for 10% or more of the Company's accounts receivable balance, representing approximately 12% of total accounts receivable. The Company performs ongoing credit evaluations of its customers and generally does not require collateral on accounts receivable, although in some instances the Company may require letters of credit to support customer outstanding accounts receivable balances. The Company maintains an allowance for doubtful accounts and such losses have been within management's expectations.

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COMMON STOCK REPURCHASES	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
COMMON STOCK REPURCHASES	COMMON STOCK REPURCHASESIn the second quarter of 2019, the Company's Board of Directors (the "Board") approved a stock repurchase program (the "Repurchase Program") pursuant to which the Company could repurchase up to $75 million of its common stock prior to April 18, 2021. The Company did not repurchase any common stock during the three and six months ended June 30, 2021 or 2020. The Repurchase Program expired on April 18, 2021. At December 31, 2020, the Company had $70.5 million remaining under the Repurchase Program for future repurchases.

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STOCK-BASED COMPENSATION PLANS

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION PLANS

STOCK-BASED COMPENSATION PLANS

2019 Stock Incentive Plan

The Company's Amended and Restated 2019 Incentive Award Plan (the "2019 Plan") provides for the award of options to purchase the Company's common stock ("stock options"), stock appreciation rights ("SARs"), restricted stock awards ("RSAs"), performance-based stock awards ("PSAs"), restricted stock units ("RSUs"), performance-based stock units ("PSUs") and other stock- or cash-based awards. Awards can be granted under the 2019 Plan to the Company's employees, officers and non-employee directors, as well as consultants and advisors of the Company and its subsidiaries.

2007 Plan

The Company's 2007 Plan provided for the award of stock options, SARs, RSAs, PSAs, RSUs, PSUs and other stock-based awards to employees, officers, non-employee directors, consultants and advisors of the Company and its subsidiaries. On and following June 5, 2019, with the exception of shares underlying awards outstanding as of that date, no additional shares may be granted under the 2007 Plan.

Assumed Stock Plans

In connection with the acquisition of Edgewater Networks, Inc. in August 2018, the Company assumed Edgewater's Amended and Restated 2002 Stock Option Plan (the "Edgewater Plan") to the extent of the shares underlying the options outstanding under the Edgewater Plan as of the Edgewater Acquisition Date (the "Edgewater Options"). The Edgewater Options were converted to Ribbon stock options (the "Ribbon Replacement Options") which are vesting under the same schedules as the respective Edgewater Options.

In connection with the Company's acquisitions of Performance Technologies Inc. ("PT") in 2014, and Network Equipment

Technologies, Inc. ("NET") in 2012, the Company assumed their stock plans (collectively, the "Assumed Plans"). Any outstanding awards under the Assumed Plans that in the future expire, terminate, are cancelled or surrendered, or are repurchased by the Company will be returned to the 2019 Plan. Accordingly, no additional shares may be granted under the Assumed Plans.

Executive Equity Arrangements

Inducement Awards

In connection with his appointment as President and Chief Executive Office of Ribbon, and as an inducement for Bruce McClelland's ("Mr. McClelland") commencement of employment, the Company awarded Mr. McClelland sign-on equity grants, comprised of 462,963 RSUs and a PSU grant with both market and service conditions (the "Inducement PSUs") on March 16, 2020. The RSUs vested and were released to Mr. McClelland on March 16, 2021. Subject to Mr. McClelland's continued employment, the Inducement PSUs are eligible to vest and be settled in up to 4,750,000 shares of Ribbon common stock upon the achievement of specified share price thresholds on or prior to September 1, 2024. The first share price threshold for Mr. McClelland’s Inducement PSUs was achieved on February 26, 2021, and accordingly 1,333,333 shares were released to him. These releases are included in the applicable tables below.

Performance-Based Stock Grants

In addition to granting RSUs to its executives and certain of its employees, the Company also grants PSUs to certain of its executives, including the Inducement PSUs granted to Mr. McClelland as described above.

In 2021, 2020 and 2019, the Company granted certain of its executives (the "2021 PSUs", "2020 PSUs" and "2019 PSUs", respectively), of which 60% of each executive's PSU grant had both performance and service conditions (the "Performance PSUs") and 40% had both market and service conditions (the "Market PSUs").

Each executive's Performance PSU grant is comprised of three consecutive fiscal year performance periods beginning in the year of grant (each, a "Fiscal Year Performance Period"), with one-third of the Performance PSUs attributable to each Fiscal Year Performance Period. The number of shares that will be vest for each Fiscal Year Performance Period, if any, will be based on the achievement of certain metrics related to the Company's financial performance for the applicable year on a standalone basis (each, a "Fiscal Year Performance Condition"). The Company's achievement of the goals for each Fiscal Year Performance Condition (and the number of shares of Company common stock to vest as a result thereof) are being measured on a linear sliding scale in relation to specific threshold, target and stretch performance conditions, with any shares earned vesting in the first quarter of the fiscal year following the third Performance Period of the grant, pending each executive's continued employment with the Company through that date. The number of shares of common stock underlying the Performance PSUs that can be earned will in no event exceed 200% of the Performance PSUs. Shares subject to the Performance PSUs that fail to be earned will be forfeited.

The Market PSUs have one three-year performance period, beginning January 1 in the year of grant and ending on December 31, three years thereafter (the "Market Performance Period"). The number of shares subject to the Market PSUs that will vest, if any, will be dependent upon the Company's total shareholder return ("TSR") compared with the TSR of the companies included in a custom index for the applicable Market Performance Period, measured by the Compensation Committee after the Market Performance Period ends, with any shares earned vesting in the first quarter of the fiscal year following the respective Market Performance Period, pending each executive's continued employment with the Company through that date. The number of shares of common stock underlying the Market PSUs that can be earned will in no event exceed 200% of the Market PSUs. Shares subject to the Market PSUs that fail to be earned will be forfeited.

In addition, in connection with his appointment as Executive Vice President and General Manager, Packet Optical Networking, the Company granted Sam Bucci 133,333 PSUs (the "Bucci Stock Price PSUs") with both market and service conditions. Subject to Mr. Bucci's continued employment, the Bucci Stock Price PSUs were eligible to vest and be settled in shares of Ribbon's common stock upon the achievement of a specific share price threshold on or prior to January 31, 2022. The share price threshold for Mr. Bucci’s Stock Price PSUs was achieved on February 12, 2021, and the shares were released to him. This release is included in the applicable table below.

Accounting for Performance PSUs. Once the grant date criteria have been met for a Fiscal Year Performance Period, the Company records stock-based compensation expense for the respective underlying Performance PSUs based on its assessment of the probability that each performance condition will be achieved and the level, if any, of such achievement. The Compensation Committee determines the number of shares earned, if any, after the Company's financial results for each Fiscal Year Performance Period are finalized. Upon the determination by the Compensation Committee of the number of shares that will be received upon vesting of the Performance PSUs, such number of shares becomes fixed and the unamortized expense is recorded through the remainder of the service period, generally three years from the date of grant, at which time the total Performance PSUs earned, if any, will vest, pending each executive's continued employment with the Company through that date.

Accounting for Market PSUs. PSUs that include a market condition require the use of a Monte Carlo simulation approach to model future stock price movements based upon the risk-free rate of return, the date of return, the volatility of each entity and the pair-wise covariance between each entity. These results are then used to calculate the grant date fair values of the respective PSUs. The Company is required to record expense for the PSUs with market conditions through their respective final vesting dates, regardless of the number of shares that are ultimately earned.

At March 31, 2021, the calculation of the grant date fair value of the Market PSUs granted on March 15, 2021 had not been completed. The Company used a grant date fair value of $8.65, the closing stock price on the date of grant, to calculate expense attributable to the three months ended March 31, 2021 for these Market PSUs. During the three months ended June 30, 2021, the Company completed the Monte Carlo valuation of these Market PSUs and calculated that the grant date fair value of each Market PSU was $13.67. The Company recorded a cumulative adjustment to expense to account for the change in grant date fair value in the second quarter of 2021. The change in grant date fair value and related cumulative adjustment did not have a material impact on its consolidated financial statements.

Employee Bonus Program

Effective in 2021, the Company added an equity component to its cash bonus program for eligible employees, under which RSUs with a grant date fair value equal to 50% of each employee's target cash bonus were granted to each such employee (the "Bonus RSUs"). Correspondingly, cash target bonuses for eligible employees were reduced by 50%. The Company implemented this program to expand the opportunities for stock ownership more broadly throughout the Company. The Bonus RSU grants are included in the applicable table below.

Stock Options

The activity related to the Company's outstanding stock options for the six months ended June 30, 2021 was as follows:

	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	207,710	$	12.69
Exercised	(13,602)	$	1.76
Expired	(3,386)	$	17.04
Outstanding at June 30, 2021	190,722	$	13.40	3.11	$	240
Vested or expected to vest at June 30, 2021	190,709	$	13.40	3.11	$	240
Exercisable at June 30, 2021	189,978	$	13.44	3.10	$	236

The total intrinsic value of options exercised was nominal in the three months ended June 30, 2021 and $0.1 million in the six months ended June 30, 2021. The Company received nominal cash from option exercises in the three months ended June 30, 2021 and approximately $24,000 in the six months ended June 30, 2021.

Restricted Stock Awards and Units

The activity related to the Company's RSAs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	86,983	$	7.04
Vested	(86,983)	$	7.04
Unvested balance at June 30, 2021	—	$	—

The activity related to the Company's RSUs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	6,531,110	$	3.32
Granted	3,087,947	$	8.57
Vested	(2,378,221)	$	3.19
Forfeited	(458,054)	$	4.18
Unvested balance at June 30, 2021	6,782,782	$	5.70

The total grant date fair value of shares of restricted stock granted under RSAs and RSUs that vested during the six months ended June 30, 2021 was $8.2 million.

Performance-Based Stock Units

The activity related to the Company's PSUs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	6,035,931	$	1.56
Granted	672,121	$	10.22
Vested	(1,525,681)	$	0.98
Forfeited	(91,005)	$	4.29
Unvested balance at June 30, 2021	5,091,366	$	2.99

The total grant date fair value of shares of restricted stock granted under PSUs that vested during the six months ended June 30, 2021 was $1.5 million.

Stock-Based Compensation

The condensed consolidated statements of operations include stock-based compensation for the three and six months ended June 30, 2021 and 2020 as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Product cost of revenue	$	93	$	39	$	120	$	66
Service cost of revenue	469		159		704		289
Research and development	1,160		738		1,787		1,296
Sales and marketing	1,752		1,011		3,626		1,763
General and administrative	1,316		1,275		3,613		2,784
	$	4,790	$	3,222	$	9,850	$	6,198

There was an income tax benefit of $1.3 million for stock-based compensation in the six months ended June 30, 2021; however, there was no income tax benefit in the six months ended June 30, 2020 due to the valuation allowance recorded.

At June 30, 2021, there was $34.6 million, net of expected forfeitures, of unrecognized stock-based compensation expense related to unvested stock options, stock awards and stock units. This expense is expected to be recognized over a weighted average period of approximately two years.

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LEASES

6 Months Ended

Jun. 30, 2021

Leases [Abstract]

LEASES

LEASES

The Company has operating and finance leases for corporate offices, research and development facilities, and certain equipment. Operating leases are reported separately in the Company's condensed consolidated balance sheets. Assets acquired under finance leases are included in Property and equipment, net, in the condensed consolidated balance sheets.

The Company determines if an arrangement is a lease at inception. A contract is determined to contain a lease component if the arrangement provides the Company with a right to control the use of an identified asset. Lease agreements may include lease and non-lease components. In such instances for all classes of underlying assets, the Company does not separate lease and non-lease components but rather, accounts for the entire arrangement under leasing guidance. Leases with an initial term of 12 months or less are not recorded on the balance sheet and lease expense for these leases is recognized on a straight-line basis over the lease term.

Right-of-use assets and lease liabilities are initially measured based on the present value of the future minimum fixed lease payments (i.e., fixed payments in the lease contract) over the lease term at the commencement date. As the Company's existing leases do not have a readily determinable implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of future minimum fixed lease payments. The Company calculates its incremental borrowing rate to reflect the interest rate that it would have to pay to borrow on a collateralized basis an amount equal to the lease payments in a similar economic environment over a similar term and considers its historical borrowing activities and market data from entities with comparable credit ratings in this determination. The measurement of the right-of-use asset also includes any lease payments made prior to the commencement date (excluding any lease incentives) and initial direct costs incurred. The Company assessed its right-of-use assets for impairment as of June 30, 2021 and December 31, 2020 and determined no impairment has occurred.

Lease terms may include options to extend or terminate the lease and the Company incorporates such options in the lease term when it has the unilateral right to make such an election and it is reasonably certain that the Company will exercise that option. In making this determination, the Company considers its prior renewal and termination history and planned usage of the assets under lease, incorporating expected market conditions.

For operating leases, lease expense for minimum fixed lease payments is recognized on a straight-line basis over the lease term. The expense for finance leases includes both interest and amortization expense components, with the interest component calculated based on the effective interest method and the amortization component calculated based on straight-line amortization of the right-of-use asset over the lease term. Lease contracts may contain variable lease costs, such as common area maintenance, utilities and tax reimbursements that vary over the term of the contract. Variable lease costs are not included in minimum fixed lease payments and as a result, are excluded from the measurement of the right-of-use assets and lease

liabilities. The Company expenses all variable lease costs as incurred.

In connection with the 2019 Restructuring Initiative, certain lease assets related to facilities are being partially or fully vacated as the Company consolidates its facilities. The Company has no plans to enter into sublease agreements for certain facilities. The Company ceased use of these facilities in the first quarter of 2021, the first and fourth quarters of 2020 and the third quarter of 2019. Accordingly, the Company accelerated the amortization of the associated lease assets through the planned cease-use date of each facility, resulting in additional amortization expense of $3.4 million and $0.1 million in the six months ended June 30, 2021 and 2020, respectively. The Company also recorded expense of $1.4 million in the aggregate in the six months ended June 30, 2021 for all estimated future variable lease costs related to these facilities. The Company recorded a nominal credit for all estimated future variable lease costs in the six months ended June 30, 2020. The Company did not record additional amortization expense or estimated future variable lease costs in the three months ended June 30, 2021 or 2020.

All accelerated amortization and accrual of future variable costs were recorded as Restructuring and related expense in the Company's condensed consolidated statements of operations. At June 30, 2021 and December 31, 2020, the Company had accruals of $1.9 million and $0.8 million, respectively, for all future anticipated variable lease costs related to these facilities. The Company may incur additional future expense if it is unable to sublease other locations included in the Facilities Initiative.

The Company leases its corporate offices and other facilities under operating leases, which expire at various times through 2032. In December 2020, the Company began relocating from its former leased Plano, Texas facility to its recently completed leased facility, also located in Plano, Texas, which became the Company's corporate headquarters. The Company's relocation to the new corporate headquarters was completed in the first quarter of 2021.

The Company's right-of-use lease assets and lease liabilities at June 30, 2021 and December 31, 2020 were as follows (in thousands):

	Classification	June 30, 2021		December 31, 2020
Assets:
Operating lease assets	Operating lease right-of-use assets	$	57,869	$	69,757
Finance lease assets*	Property and equipment, net	574		983
Total leased assets		$	58,443	$	70,740
Liabilities:
Current:
Operating	Operating lease liabilities	$	17,974	$	17,023
Finance	Accrued expenses and other	709		902
Noncurrent:
Operating	Operating lease liabilities, net of current	62,615		72,614
Finance	Other long-term liabilities	253		568
Total lease liabilities		$	81,551	$	91,107

* Finance lease assets were recorded net of accumulated depreciation of $2.3 million and $1.9 million at June 30, 2021 and December 31, 2020, respectively.

The components of lease expense for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Operating lease cost*	$	5,194	$	5,217	$	14,031	$	8,561
Finance lease cost:
Amortization of leased assets	180		319		409		638
Interest on lease liabilities	20		47		46		102
Short-term lease cost	3,270		5,629		6,562		11,124
Variable lease costs (costs excluded from minimum fixed lease payments)**	500		635		2,658		1,272
Sublease income	(199)		(320)		(475)		(564)
Net lease cost	$	8,965	$	11,527	$	23,231	$	21,133

* Operating lease costs for the six months ended June 30, 2021 included $3.4 million of accelerated amortization for certain assets partially or fully vacated in 2021 with no intent or ability to sublease. Operating lease costs for the six months ended June 30, 2020 included $0.1 million of accelerated amortization for certain assets partially or fully vacated in 2020 with no ability to sublease. The Company did not record accelerated amortization in the three months ended June 30, 2021 or 2020.

** Variable lease costs for the six months ended June 30, 2021 included accruals of $1.4 million for all future estimated variable expenses related to certain assets partially or fully vacated in 2021 with no intent or ability to sublease. No such variable costs were accrued in the three months ended June 30, 2021 or in the three and six months ended June 30, 2020.

Cash flow information related to the Company's leases for the six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Six months ended
	June 30, 2021		June 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	10,997	$	7,844
Operating cash flows for finance leases	$	46	$	102
Financing cash flows for finance leases	$	507	$	668

Other information related to the Company's leases as of June 30, 2021 and December 31, 2020 was as follows:

	June 30, 2021		December 31, 2020
Weighted average remaining lease term (years):
Operating leases	6.49		6.59
Finance leases	1.35		1.70
Weighted average discount rate:
Operating leases	5.71	%	5.67	%
Finance leases	5.09	%	6.15	%

Future minimum fixed lease payments under noncancelable leases at June 30, 2021 were as follows (in thousands):

	June 30, 2021
	Operating		Finance
	leases		leases
Remainder of 2021	$	11,326	$	422
2022	20,323		511
2023	17,530		63
2024	9,704		—
2025	7,791		—
2026 and beyond	31,353		—
Total lease payments	98,027		996
Less: interest	(17,438)		(35)
Present value of lease liabilities	$	80,589	$	961

LEASES

LEASES

The Company has operating and finance leases for corporate offices, research and development facilities, and certain equipment. Operating leases are reported separately in the Company's condensed consolidated balance sheets. Assets acquired under finance leases are included in Property and equipment, net, in the condensed consolidated balance sheets.

The Company determines if an arrangement is a lease at inception. A contract is determined to contain a lease component if the arrangement provides the Company with a right to control the use of an identified asset. Lease agreements may include lease and non-lease components. In such instances for all classes of underlying assets, the Company does not separate lease and non-lease components but rather, accounts for the entire arrangement under leasing guidance. Leases with an initial term of 12 months or less are not recorded on the balance sheet and lease expense for these leases is recognized on a straight-line basis over the lease term.

Right-of-use assets and lease liabilities are initially measured based on the present value of the future minimum fixed lease payments (i.e., fixed payments in the lease contract) over the lease term at the commencement date. As the Company's existing leases do not have a readily determinable implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of future minimum fixed lease payments. The Company calculates its incremental borrowing rate to reflect the interest rate that it would have to pay to borrow on a collateralized basis an amount equal to the lease payments in a similar economic environment over a similar term and considers its historical borrowing activities and market data from entities with comparable credit ratings in this determination. The measurement of the right-of-use asset also includes any lease payments made prior to the commencement date (excluding any lease incentives) and initial direct costs incurred. The Company assessed its right-of-use assets for impairment as of June 30, 2021 and December 31, 2020 and determined no impairment has occurred.

Lease terms may include options to extend or terminate the lease and the Company incorporates such options in the lease term when it has the unilateral right to make such an election and it is reasonably certain that the Company will exercise that option. In making this determination, the Company considers its prior renewal and termination history and planned usage of the assets under lease, incorporating expected market conditions.

For operating leases, lease expense for minimum fixed lease payments is recognized on a straight-line basis over the lease term. The expense for finance leases includes both interest and amortization expense components, with the interest component calculated based on the effective interest method and the amortization component calculated based on straight-line amortization of the right-of-use asset over the lease term. Lease contracts may contain variable lease costs, such as common area maintenance, utilities and tax reimbursements that vary over the term of the contract. Variable lease costs are not included in minimum fixed lease payments and as a result, are excluded from the measurement of the right-of-use assets and lease

liabilities. The Company expenses all variable lease costs as incurred.

In connection with the 2019 Restructuring Initiative, certain lease assets related to facilities are being partially or fully vacated as the Company consolidates its facilities. The Company has no plans to enter into sublease agreements for certain facilities. The Company ceased use of these facilities in the first quarter of 2021, the first and fourth quarters of 2020 and the third quarter of 2019. Accordingly, the Company accelerated the amortization of the associated lease assets through the planned cease-use date of each facility, resulting in additional amortization expense of $3.4 million and $0.1 million in the six months ended June 30, 2021 and 2020, respectively. The Company also recorded expense of $1.4 million in the aggregate in the six months ended June 30, 2021 for all estimated future variable lease costs related to these facilities. The Company recorded a nominal credit for all estimated future variable lease costs in the six months ended June 30, 2020. The Company did not record additional amortization expense or estimated future variable lease costs in the three months ended June 30, 2021 or 2020.

All accelerated amortization and accrual of future variable costs were recorded as Restructuring and related expense in the Company's condensed consolidated statements of operations. At June 30, 2021 and December 31, 2020, the Company had accruals of $1.9 million and $0.8 million, respectively, for all future anticipated variable lease costs related to these facilities. The Company may incur additional future expense if it is unable to sublease other locations included in the Facilities Initiative.

The Company leases its corporate offices and other facilities under operating leases, which expire at various times through 2032. In December 2020, the Company began relocating from its former leased Plano, Texas facility to its recently completed leased facility, also located in Plano, Texas, which became the Company's corporate headquarters. The Company's relocation to the new corporate headquarters was completed in the first quarter of 2021.

The Company's right-of-use lease assets and lease liabilities at June 30, 2021 and December 31, 2020 were as follows (in thousands):

	Classification	June 30, 2021		December 31, 2020
Assets:
Operating lease assets	Operating lease right-of-use assets	$	57,869	$	69,757
Finance lease assets*	Property and equipment, net	574		983
Total leased assets		$	58,443	$	70,740
Liabilities:
Current:
Operating	Operating lease liabilities	$	17,974	$	17,023
Finance	Accrued expenses and other	709		902
Noncurrent:
Operating	Operating lease liabilities, net of current	62,615		72,614
Finance	Other long-term liabilities	253		568
Total lease liabilities		$	81,551	$	91,107

* Finance lease assets were recorded net of accumulated depreciation of $2.3 million and $1.9 million at June 30, 2021 and December 31, 2020, respectively.

The components of lease expense for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Operating lease cost*	$	5,194	$	5,217	$	14,031	$	8,561
Finance lease cost:
Amortization of leased assets	180		319		409		638
Interest on lease liabilities	20		47		46		102
Short-term lease cost	3,270		5,629		6,562		11,124
Variable lease costs (costs excluded from minimum fixed lease payments)**	500		635		2,658		1,272
Sublease income	(199)		(320)		(475)		(564)
Net lease cost	$	8,965	$	11,527	$	23,231	$	21,133

* Operating lease costs for the six months ended June 30, 2021 included $3.4 million of accelerated amortization for certain assets partially or fully vacated in 2021 with no intent or ability to sublease. Operating lease costs for the six months ended June 30, 2020 included $0.1 million of accelerated amortization for certain assets partially or fully vacated in 2020 with no ability to sublease. The Company did not record accelerated amortization in the three months ended June 30, 2021 or 2020.

** Variable lease costs for the six months ended June 30, 2021 included accruals of $1.4 million for all future estimated variable expenses related to certain assets partially or fully vacated in 2021 with no intent or ability to sublease. No such variable costs were accrued in the three months ended June 30, 2021 or in the three and six months ended June 30, 2020.

Cash flow information related to the Company's leases for the six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Six months ended
	June 30, 2021		June 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	10,997	$	7,844
Operating cash flows for finance leases	$	46	$	102
Financing cash flows for finance leases	$	507	$	668

Other information related to the Company's leases as of June 30, 2021 and December 31, 2020 was as follows:

	June 30, 2021		December 31, 2020
Weighted average remaining lease term (years):
Operating leases	6.49		6.59
Finance leases	1.35		1.70
Weighted average discount rate:
Operating leases	5.71	%	5.67	%
Finance leases	5.09	%	6.15	%

Future minimum fixed lease payments under noncancelable leases at June 30, 2021 were as follows (in thousands):

	June 30, 2021
	Operating		Finance
	leases		leases
Remainder of 2021	$	11,326	$	422
2022	20,323		511
2023	17,530		63
2024	9,704		—
2025	7,791		—
2026 and beyond	31,353		—
Total lease payments	98,027		996
Less: interest	(17,438)		(35)
Present value of lease liabilities	$	80,589	$	961

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INCOME TAXES

6 Months Ended

Jun. 30, 2021

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company's income tax provisions for the six months ended June 30, 2021 and 2020 reflect the Company's estimates of the effective rates expected to be applicable for the respective full years, adjusted for any discrete events, which are recorded in the period that they occur. These estimates are reevaluated each quarter based on the Company's estimated tax expense for the full year. The estimated effective tax rate includes the impact of valuation allowances in various jurisdictions.

The Company intends to continue to maintain a full valuation allowance on its deferred tax assets until there is sufficient evidence to support the reversal of all or some portion of the allowance. However, given its current earnings and anticipated future earnings, the Company believes there is a reasonable possibility that within the next 12 months, sufficient positive evidence may become available to reach a conclusion that a significant portion of the U.S. valuation allowance will no longer be needed. Release of the valuation allowance would result in the recognition of certain deferred tax assets and a decrease in income tax expense for the period in which the release is recorded. However, the exact timing and amount, of the valuation allowance release, if any, are subject to change on the basis of the level of profitability that the Company is able to actually achieve.

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Liabilities for Royalty Payments to the IIA. Prior to the ECI Acquisition, ECI had received research and development grants from the Office of the Innovation Authority of the Israeli Ministry of Economics (the "IIA"). The Company assumed ECI's contract with the IIA, which requires the Company to pay royalties to the IIA on proceeds from the sale of products which the Israeli government has supported by way of research and development grants. The royalties for grants prior to 2017 were calculated at the rates of 1.3% to 5.0% of the aggregated proceeds from the sale of such products developed at certain of the Company's R&D centers, up to an amount not exceeding 100% of such grants plus interest at LIBOR. Effective for grants approved in 2017 and subsequently, interest was calculated at the higher of LIBOR plus 1.5% to 2.75%. At June 30, 2021, the Company's maximum possible future royalties commitment, including $3.9 million of unpaid royalties accrued, was $36.8 million, including interest of $1.9 million, based on estimates of future product sales, grants received from the IIA not yet repaid, and management's estimation of products still to be sold.

Research and Development Grants. The Company records grants received from the IIA as a reduction to research and development expense. Royalties payable to the IIA are recognized pursuant to sales of related products and are classified as Cost of revenue. The Company does not anticipate receiving material grants from the IIA in the foreseeable future.

Litigation. On November 8, 2018, Ron Miller, a purported stockholder of the Company, filed a Class Action Complaint (the "Miller Complaint") in the United States District Court for the District of Massachusetts (the "Massachusetts District Court") against the Company and three of its former officers (collectively, the "Defendants"), claiming to represent a class of purchasers of Sonus common stock during the period from January 8, 2015 through March 24, 2015 and alleging violations of the federal securities laws. Similar to a previous complaint entitled Sousa et al. vs. Sonus Networks, Inc. et al., which was

dismissed with prejudice by an order dated June 6, 2017, the Miller Complaint claims that the Defendants made misleading forward-looking statements concerning Sonus' expected fiscal first quarter of 2015 financial performance, which statements were also the subject of an August 7, 2018 Securities and Exchange Commission Cease and Desist Order, whose findings the Company neither admitted nor denied. The Miller plaintiffs are seeking monetary damages.

After the Miller Complaint was filed, several parties filed and briefed motions seeking to be selected by the Massachusetts District Court to serve as a Lead Plaintiff in the action. On June 21, 2019, the Massachusetts District Court appointed a group as Lead Plaintiffs and the Lead Plaintiffs filed an amended complaint on July 19, 2019. On August 30, 2019, the Defendants filed a motion to dismiss the Miller Complaint and, on October 4, 2019, the Lead Plaintiffs filed an opposition to the motion to dismiss. There was an oral argument on the motion to dismiss on February 12, 2020.

In addition, the Company is often a party to disputes and legal proceedings that it considers routine and incidental to its business. Management does not expect the results of any of these actions to have a material effect on the Company's business or condensed consolidated financial statements.

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BASIS OF PRESENTATION (Policies)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting only of normal recurring items, necessary for their fair presentation with accounting principles generally accepted in the United States of America ("GAAP") and with the rules and regulations of the U.S. Securities and Exchange Commission ("SEC").

On December 1, 2020 (the "Kandy Sale Date"), American Virtual Cloud Technologies, Inc. ("AVCT") completed the purchase of the Company's cloud-based enterprise service business (the "Kandy Communications Business") and accordingly, the revenue and expenses of the Kandy Communications Business are excluded from the Company's condensed consolidated financial statements for the three and six months ended June 30, 2021.

On March 3, 2020 (the "ECI Acquisition Date"), a subsidiary of the Company merged (the "ECI Acquisition") with ECI Telecom Group Ltd ("ECI"). The financial results of ECI are included in the Company's condensed consolidated financial statements for the period subsequent to the ECI Acquisition Date.

Interim results are not necessarily indicative of results for a full year or any future interim period. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2020 (the "Annual Report"), which was filed with the SEC on February 26, 2021.

Operating Segments

Operating Segments

The Company's chief operating decision maker (the "CODM") is its President and Chief Executive Officer. Effective in the fourth quarter of 2020 and in connection with the ECI Acquisition, the CODM began to assess the Company's performance based on the performance of two separate organizations within Ribbon: the Cloud and Edge segment ("Cloud and Edge") and the IP Optical Networks segment ("IP Optical Networks"). Financial information for the IP Optical Networks segment included in the Company's financial results for the six months ended June 30, 2020 is for the period subsequent to the ECI Acquisition Date through June 30, 2020.

Reclassifications

Reclassifications

In the fourth quarter of 2020, the Company reclassified amounts recorded for amortization of acquired intangible assets in prior presentations from Cost of revenue - product and Sales and marketing to a separate line included in operating expenses in the condensed consolidated statements of operations, as management believes this presentation enhances the comparability of the Company's financial statements with industry peers. These reclassifications also did not impact the condensed consolidated balance sheets or statements of cash flows for any historical periods. The Company did not reclassify depreciation of property and equipment related to production activities from cost of revenue to other accounts.

Certain reclassifications, not affecting previously reported net loss, have been made to the previously issued financial statements to conform to the current period presentation.

Principles of Consolidation

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Ribbon and its wholly-owned subsidiaries. Intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates and Judgments

Use of Estimates and Judgments

The preparation of financial statements in conformity with GAAP requires Ribbon to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and judgments relied upon in preparing these condensed consolidated financial statements include accounting for business combinations, revenue recognition for multiple element arrangements, inventory valuations, assumptions used to determine the fair value of stock-based compensation, intangible asset and goodwill valuations, including impairments, legal contingencies and recoverability of Ribbon's net deferred tax assets and the related valuation allowances. Ribbon regularly assesses these estimates and records changes in estimates in the period in which they become known. Ribbon bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances. Actual results could differ from those estimates.

Restricted Cash

Restricted Cash

The Company classifies as restricted cash all cash pledged as collateral to secure long-term obligations and all cash whose use is otherwise limited by contractual provisions.

At June 30, 2021, the Company had $2.6 million of restricted cash, representing restricted short-term bank deposits pledged to secure certain performance and financial bonds as security for the Company's obligations under tenders, contracts and to one of its main subcontractors.

At December 31, 2020, the Company had $7.3 million of restricted cash, comprised of $4.6 million restricted in connection with a tax payment on certain fixed assets formerly held by ECI that were sold in connection with the ECI Acquisition, and $2.7 million of restricted short-term bank deposits pledged to secure certain performance and financial bonds as security for the Company's obligations under tenders, contracts and to one of its main subcontractors.

Transfers of Financial Assets

Transfers of Financial AssetsThe Company maintains customer receivables factoring agreements with a number of financial institutions primarily for IP Optical Networks sales outside of the United States. Under the terms of these agreements, the Company may transfer receivables to the financial institutions, on a non-recourse basis, provided that the financial institutions approve the receivables in advance. The Company maintains credit insurance policies from major insurance providers or obtains letters of credit from the customers for a majority of its factored trade receivables. The Company accounts for the factoring of its financial assets as a sale of the assets and records the factoring fees, when incurred, as a component of interest expense in the condensed consolidated statements of operations, and the proceeds from the sales of receivables are included in cash from operating activities in the condensed consolidated statements of cash flows.

Fair Value of Financial Instruments and Fair Value Hierarchy

Fair Value of Financial Instruments and Fair Value Hierarchy

The carrying amounts of the Company's financial instruments approximate their fair values and include cash equivalents, accounts receivable, borrowings under a revolving credit facility, accounts payable and long-term debt.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. The three-tier fair value hierarchy is based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:

Level 1. Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities.

Level 2. Level 2 applies to assets or liabilities for which there are inputs that are directly or indirectly observable in the marketplace, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets).

Level 3. Level 3 applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

The Financial Accounting Standards Board ("FASB") issued the following accounting pronouncement which became effective for the Company in 2021, and which did not have a material impact on its condensed consolidated financial statements:

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes ("ASU 2019-12"), which modifies ASC 740 to simplify the accounting for income taxes. ASU 2019-12 addresses the accounting for hybrid tax regimes, tax basis step-up in goodwill obtained in a transaction that is not a business combination, separate financial statements of legal entities not subject to tax, intraperiod tax allocation exception to incremental approach, ownership changes in investments - changes from a subsidiary to an equity method investment, ownership changes in investments - changes from an equity method investment to a subsidiary, interim period accounting for enacted changes in tax law and year-to-date loss limitation in interim period tax accounting.

The FASB issued the following accounting pronouncement, which the Company does not believe will have a material impact on its condensed consolidated financial statements upon adoption:

In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope ("ASU 2021-01"), which refines the scope of Accounting Standards Codification 848, Reference Rate Reform ("ASC 848") and clarifies some of its guidance as part of the FASB's monitoring of global reference rate reform activities. ASU 2021-01 permits entities to elect certain optional expedients and exceptions when accounting for derivative contracts and certain hedging relationships affected by changes in the interest rates used for discounting cash flows, for computing variation margin settlements, and for calculating price alignment interest in connection with reference rate reform activities under way in global financial markets (the "discounting transition"). ASU 2021-01 is effective for the Company prospectively in any period through December 31, 2022 that a modification is made to the terms of the derivatives affected by the discounting transition.

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BASIS OF PRESENTATION (Tables)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Schedule of Error Corrections and Prior Period Adjustments

These reclassifications for the three and six months ended June 30, 2020 were as follows (in thousands):

	Three months ended June 30, 2020						Six months ended June 30, 2020
	Prior presentation		Amounts reclassified		Revised presentation		Prior presentation		Amounts reclassified		Revised presentation
Product revenue	$	120,862			$	120,862	$	196,761			$	196,761
Service revenue	89,631				89,631		171,714				171,714
Total revenue	210,493		—		210,493		368,475		—		368,475
Cost of revenue - product	61,529		(10,950)		50,579		106,462		(19,904)		86,558
Cost of revenue - service	36,647				36,647		68,126				68,126
Total cost of revenue	98,176		(10,950)		87,226		174,588		(19,904)		154,684
Total gross profit	112,317		10,950		123,267		193,887		19,904		213,791
Research and development	51,796				51,796		94,091				94,091
Sales and marketing	37,617		(3,719)		33,898		73,968		(9,099)		64,869
General and administrative	15,094				15,094		32,299				32,299
Amortization of acquired intangible assets	—		14,669		14,669		—		29,003		29,003
Acquisition-, disposal- and integration-related	857				857		13,241				13,241
Restructuring and related	5,361				5,361		7,436				7,436
Total operating expenses	110,725		10,950		121,675		221,035		19,904		240,939
Income (loss) from operations	$	1,592	$	—	$	1,592	$	(27,148)	$	—	$	(27,148)

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ECI ACQUISITION (Tables)

6 Months Ended

Jun. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Summary of Allocation of Purchase Consideration

A summary of the allocation of the purchase consideration for ECI is as follows (in thousands):

Fair value of consideration transferred:
Cash consideration:
Repayment of ECI outstanding debt obligations	$	183,266
Cash paid to selling shareholders	139,244
Payment to selling shareholders from sale of ECI real estate assets	33,400
Less cash and restricted cash acquired	(9,058)
Net cash consideration	346,852
Fair value of Ribbon stock issued	108,550
Fair value of total consideration	$	455,402
Fair value of assets acquired and liabilities assumed:
Current assets, net of cash and restricted cash acquired	$	120,203
Property and equipment	54,913
Intangible assets:
In-process research and development	34,000
Developed technology	111,900
Customer relationships	116,000
Trade names	3,000
Goodwill	191,996
Other noncurrent assets	37,528
Deferred revenue	(4,369)
Other current liabilities	(146,618)
Deferred revenue, net of current	(3,726)
Deferred tax liability	(13,308)
Other long-term liabilities	(46,117)
	$	455,402

Unaudited Pro Forma Results

The unaudited pro forma results do not reflect any operating efficiencies or potential cost savings that may result from the consolidation of the operations of Ribbon and ECI. Accordingly, these unaudited pro forma results are presented for illustrative

purposes and are not intended to represent or be indicative of the actual results of operations of the combined company that would have been achieved had the ECI Acquisition occurred at January 1, 2019, nor are they intended to represent or be indicative of future results of operations (in thousands, except per share amounts):

			4
	Three months ended			Six months ended
	June 30, 2020			June 30, 2020
Revenue	$	210,493		$	393,682
Net loss	$	(9,252)		$	(48,381)
Loss per share	$	(0.06)		$	(0.33)

Schedule of Components of Acquisition Related Costs

The Company's acquisition-, disposal- and integration-related expenses for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Professional and services fees (acquisition-related)	$	143	$	640	$	143	$	13,014
Professional and services fees (disposal-related)	—		—		241		—
Integration-related expenses	909		217		1,865		227
	$	1,052	$	857	$	2,249	$	13,241

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EARNINGS (LOSS) PER SHARE (Tables)

6 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

Schedule of Calculations of Shares Used to Compute Basic and Diluted Earnings (Loss) Per Share

The calculations of shares used to compute earnings (loss) per share were as follows (in thousands):

	Three months ended		Six months ended
	June 30, 2021	June 30, 2020	June 30, 2021	June 30, 2020
Weighted average shares outstanding - basic	147,467	144,483	146,706	132,737
Potential dilutive common shares	6,693	—	—	—
Weighted average shares outstanding - diluted	154,160	144,483	146,706	132,737

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INVENTORY (Tables)

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

	June 30, 2021		December 31, 2020
On-hand final assemblies and finished goods inventories	$	49,725	$	46,921
Deferred cost of goods sold	1,752		1,165
	51,477		48,086
Less noncurrent portion (included in other assets)	(4,921)		(2,336)
Current portion	$	46,556	$	45,750

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INTANGIBLE ASSETS AND GOODWILL (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

The Company's intangible assets at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

June 30, 2021	Weighted average amortization period (years)	Cost		Accumulated amortization		Net carrying value
In-process research and development	*	$	34,000	$	—	$	34,000
Developed technology	7.93	306,380		162,811		143,569
Customer relationships	11.86	268,140		63,222		204,918
Trade names	3.88	5,000		3,135		1,865
Internal use software	3.00	730		730		—
	9.17	$	614,250	$	229,898	$	384,352

December 31, 2020	Weighted average amortization period (years)	Cost		Accumulated amortization		Net carrying value
In-process research and development	*	$	34,000	$	—	$	34,000
Developed technology	7.93	306,380		143,050		163,330
Customer relationships	11.86	268,140		50,627		217,513
Trade names	3.88	5,000		2,487		2,513
Internal use software	3.00	730		730		—
	9.17	$	614,250	$	196,894	$	417,356

* An in-process research and development intangible asset has an indefinite life until the product is generally available, at which time such asset is typically reclassified to developed technology.

Schedule of Estimated Future Amortization Expense for Intangible Assets

Estimated future amortization expense for the Company's intangible assets at June 30, 2021 was as follows (in thousands):

Years ending December 31,
Remainder of 2021	$	33,621
2022	60,449
2023	53,966
2024	46,899
2025	40,338
2026	36,489
Thereafter	112,590
	$	384,352

Schedule of Goodwill

The changes in the carrying value of the Company's goodwill in the six months ended June 30, 2020 were as follows (in thousands):

	Cloud and Edge		IP Optical Networks		Total
Balance at January 1, 2020*	$	224,896	$	—	$	224,896
Acquisition of ECI	—		191,996		191,996
Balance at June 30, 2020	$	224,896	$	191,996	$	416,892

(1) Balance is presented net of accumulated impairment losses of $167.4 million for the Cloud and Edge segment.

The components of goodwill at June 30, 2021 and 2020 were as follows (in thousands):

	Cloud and Edge		IP Optical Networks		Total
Balance at June 30, 2021
Goodwill	$	392,302	$	191,996	$	584,298
Accumulated impairment losses	(167,406)		—		(167,406)
	$	224,896	$	191,996	$	416,892
Balance at June 30, 2020
Goodwill	$	392,302	$	191,996	$	584,298
Accumulated impairment losses	(167,406)		—		(167,406)
	$	224,896	$	191,996	$	416,892

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ACCRUED EXPENSES AND OTHER (Tables)

6 Months Ended

Jun. 30, 2021

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses at June 30, 2021 and December 31, 2020 consisted of the following (in thousands):

	June 30, 2021		December 31, 2020
Employee compensation and related costs	$	40,208	$	66,039
Other	49,554		68,826
	$	89,762	$	134,865

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WARRANTY ACCRUALS (Tables)

6 Months Ended

Jun. 30, 2021

Guarantees and Product Warranties [Abstract]

Changes in Accrual Balance

The changes in the Company's accrual balance in the six months ended June 30, 2021 were as follows (in thousands):

Balance at January 1, 2021	$	14,855
Current period provisions	605
Settlements	(2,761)
Balance at June 30, 2021	$	12,699

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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES (Tables)

6 Months Ended

Jun. 30, 2021

Restructuring and Related Activities [Abstract]

Summary of Restructuring Accrual Activity

Restructuring and related expense for the three and six months ended June 30, 2021 and 2020 was comprised of the following (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Severance and related costs	$	1,926	$	4,716	$	2,595	$	6,487
Variable and other facilities-related costs	904		$	645	2,817		879
Accelerated amortization of lease assets due to cease-use	—		$	—	3,368		70
	$	2,830	$	5,361	$	8,780	$	7,436

A summary of the 2020 Restructuring Initiative accrual activity for severance and related costs for the six months ended June 30, 2021 is as follows (in thousands):

	Balance at January 1, 2021		Initiatives charged to expense		Adjustments for changes in estimate		Cash payments		Balance at June 30, 2021
Severance	$	5,237	$	2,595	$	—	$	(4,178)	$	3,654
Facilities	1,256		382		(670)		(949)		19
	$	6,493	$	2,977	$	(670)	$	(5,127)	$	3,673

A summary of the 2019 Restructuring Initiative accrual activity for the six months ended June 30, 2021 is as follows (in thousands):

	Balance at January 1, 2021		Initiatives charged to expense		Reclassify accelerated amortization to operating lease liabilities		Cash payments		Balance at June 30, 2021
Severance	$	173	$	—	$	—	$	(173)	$	—
Facilities	766		6,473		(3,368)		(1,943)		1,928
	$	939	$	6,473	$	(3,368)	$	(2,116)	$	1,928

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)

6 Months Ended

Jun. 30, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Impact of Derivative Financial Instrument on Condensed Consolidated Statement of Operations

The impact of the Company’s derivative financial instrument on its condensed consolidated statement of comprehensive income (loss) for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion)	$	(1,015)	$	(4,320)	$	4,875	$	(13,657)
Amount reclassified from accumulated other comprehensive income (loss) to interest expense (effective portion)	810		350		1,589		160
	$	(205)	$	(3,970)	$	6,464	(13,497)

Derivative Liability Designed as a Hedging Instrument

The fair values and locations in the condensed consolidated balance sheets at June 30, 2021 and December 31, 2020 of the Company's derivative liability designated as a hedging instrument were as follows (in thousands):

	Balance sheet location	June 30, 2021		December 31, 2020
Interest rate derivative - liability derivative	Accrued expenses and other	$	3,172	$	3,157
Interest rate derivative - liability derivative	Other long-term liabilities	$	1,312	$	7,791

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REVENUE RECOGNITION (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Schedule of Timing of Performance Obligation

The Company's typical performance obligations include the following:

Performance Obligation	When Performance Obligation is Typically Satisfied	When Payment is Typically Due
Software and Product Revenue
Software licenses (perpetual or term)	Upon transfer of control; typically, when made available for download (point in time)	Generally, within 30 days of invoicing except for term licenses, which may be paid for over time
Software licenses (subscription)	Upon activation of hosted site (over time)	Generally, within 30 days of invoicing
Hardware	When control of the hardware passes to the customer; typically, upon delivery (point in time)	Generally, within 30 days of invoicing
Software upgrades	Upon transfer of control; typically, when made available for download (point in time)	Generally, within 30 days of invoicing
Customer Support Revenue
Customer support	Ratably over the course of the support contract (over time)	Generally, within 30 days of invoicing
Professional Services
Other professional services (excluding training services)	As work is performed (over time)	Generally, within 30 days of invoicing (upon completion of services)
Training	When the class is taught (point in time)	Generally, within 30 days of services being performed

Disaggregation of Revenue

The Company's revenue for the three and six months ended June 30, 2021 and 2020 was disaggregated as follows:

Three months ended June 30, 2021	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	56,128	$	32,816	$	11,590	$	100,534
Europe, Middle East and Africa	31,309		20,739		7,741		59,789
Asia Pacific	19,045		10,837		3,868		33,750
Other	6,647		8,045		2,445		17,137
	$	113,129	$	72,437	$	25,644	$	211,210

Three months ended June 30, 2020	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	57,112	$	33,651	$	10,844	$	101,607
Europe, Middle East and Africa	35,801		19,512		4,772		60,085
Asia Pacific	21,854		7,023		3,956		32,833
Other	6,095		8,437		1,436		15,968
	$	120,862	$	68,623	$	21,008	$	210,493

Six months ended June 30, 2021	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	92,940	$	64,422	$	22,752	$	180,114
Europe, Middle East and Africa	59,517		40,394		14,651		114,562
Asia Pacific	44,627		20,585		9,671		74,883
Other	13,934		15,741		4,748		34,423
	$	211,018	$	141,142	$	51,822	$	403,982

Six months ended June 30, 2020	Product revenue		Service revenue (maintenance)		Service revenue (professional services)		Total revenue
United States	$	93,477	$	65,117	$	21,410	$	180,004
Europe, Middle East and Africa	56,166		34,322		8,787		99,275
Asia Pacific	36,797		14,534		8,834		60,165
Other	10,321		15,718		2,992		29,031
	$	196,761	$	129,691	$	42,023	$	368,475

The Company's product revenue from indirect sales through its channel partner program and from its direct sales program for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Indirect sales through channel partner program	$	27,114	$	32,649	$	47,277	$	61,253
Direct sales	86,015		88,213		163,741		135,508
	$	113,129	$	120,862	$	211,018	$	196,761

The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Sales to enterprise customers	$	24,522	$	35,950	$	47,190	$	63,231
Sales to service provider customers	88,607		84,912		163,828		133,530
	$	113,129	$	120,862	$	211,018	$	196,761

The Company's product revenue and service revenue components by segment for the three and six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Product revenue
Cloud and Edge	$	64,361	$	72,310	$	114,513	$	126,520
IP Optical Networks	48,768		48,552		96,505		70,241
Total product revenue	$	113,129	$	120,862	$	211,018	$	196,761
Service revenue
Maintenance
Cloud and Edge	$	57,986	$	57,853	$	112,659	$	113,409
IP Optical Networks	14,451		10,770		28,483		16,282
Total maintenance revenue	72,437		68,623		141,142		129,691
Professional services
Cloud and Edge	19,074		16,744		39,671		35,009
IP Optical Networks	6,570		4,264		12,151		7,014
Total professional services revenue	25,644		21,008		51,822		42,023
Total service revenue	$	98,081	$	89,631	$	192,964	$	171,714

Schedule of Customer Assets and Liabilities

The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the six months ended June 30, 2021 were as follows (in thousands):

	Accounts receivable		Unbilled accounts receivable		Deferred revenue (current)		Deferred revenue (long-term)
Balance at January 1, 2021	$	179,331	$	58,407	$	96,824	$	26,010
Increase (decrease), net	(16,223)		(1,648)		4,647		(3,974)
Balance at June 30, 2021	$	163,108	$	56,759	$	101,471	$	22,036

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OPERATING SEGMENT INFORMATION (Tables)

6 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

The tables below provide information regarding revenue, adjusted gross profit, adjusted EBITDA and depreciation expense by reportable segment for the three and six months ended June 30, 2021 and 2020 (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment revenue:
Cloud and Edge	$	141,421	$	146,907	$	266,843	$	274,938
IP Optical Networks	69,789		63,586		137,139		93,537
Revenue	$	211,210	$	210,493	$	403,982	$	368,475

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment adjusted gross profit:
Cloud and Edge	$	95,837	$	98,779	$	180,172	$	177,714
IP Optical Networks	33,152		24,686		59,626		36,432
Total segment adjusted gross profit	128,989		123,465		239,798		214,146
Stock-based compensation expense	(562)		(198)		(824)		(355)
Gross profit	$	128,427	$	123,267	$	238,974	$	213,791

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Segment adjusted EBITDA:
Cloud and Edge	$	43,536	$	37,497	$	71,866	$	47,236
IP Optical Networks	(482)		(7,947)		(9,160)		(8,145)
Total segment adjusted EBITDA	43,054		29,550		62,706		39,091
Depreciation	(4,249)		(4,786)		(8,475)		(8,260)
Amortization of intangible assets	(17,181)		(14,669)		(33,004)		(29,003)
Stock-based compensation	(4,790)		(3,222)		(9,850)		(6,198)
Litigation costs	—		937		—		(2,101)
Acquisition-, disposal- and integration-related expense	(1,052)		(857)		(2,249)		(13,241)
Restructuring and related expense	(2,830)		(5,361)		(8,780)		(7,436)
Income (loss) from operations	12,952		1,592		$	348	$	(27,148)
Segment depreciation expense:
Cloud and Edge	$	3,142	$	2,984	$	6,279	$	5,977
IP Optical Networks	1,107		1,802		2,196		2,283
Depreciation expense	$	4,249	$	4,786	$	8,475	$	8,260

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MAJOR CUSTOMERS (Tables)

6 Months Ended

Jun. 30, 2021

Risks and Uncertainties [Abstract]

Schedule of Customer Contributing 10% or More of the Revenue

The following customer contributed 10% or more of the Company's revenue in the three and six months ended June 30, 2021 and 2020:

	Three months ended		Six months ended
	June 30, 2021	June 30, 2020	June 30, 2021	June 30, 2020
Verizon Communications Inc.	17%	15%	16%	14%

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STOCK-BASED COMPENSATION PLANS (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Activity Related to Outstanding Stock Options

The activity related to the Company's outstanding stock options for the six months ended June 30, 2021 was as follows:

	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2021	207,710	$	12.69
Exercised	(13,602)	$	1.76
Expired	(3,386)	$	17.04
Outstanding at June 30, 2021	190,722	$	13.40	3.11	$	240
Vested or expected to vest at June 30, 2021	190,709	$	13.40	3.11	$	240
Exercisable at June 30, 2021	189,978	$	13.44	3.10	$	236

Schedule of Activity Related to Unvested Restricted Stock Grants

The activity related to the Company's RSAs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	86,983	$	7.04
Vested	(86,983)	$	7.04
Unvested balance at June 30, 2021	—	$	—

The activity related to the Company's RSUs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	6,531,110	$	3.32
Granted	3,087,947	$	8.57
Vested	(2,378,221)	$	3.19
Forfeited	(458,054)	$	4.18
Unvested balance at June 30, 2021	6,782,782	$	5.70

Schedule of Activity Related to Performance Stock Awards

The activity related to the Company's PSUs for the six months ended June 30, 2021 was as follows:

	Shares	Weighted Average Grant Date Fair Value
Unvested balance at January 1, 2021	6,035,931	$	1.56
Granted	672,121	$	10.22
Vested	(1,525,681)	$	0.98
Forfeited	(91,005)	$	4.29
Unvested balance at June 30, 2021	5,091,366	$	2.99

Schedule of Stock-based Compensation Expenses Which Are Included in Condensed Consolidated Statement of Operations

The condensed consolidated statements of operations include stock-based compensation for the three and six months ended June 30, 2021 and 2020 as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Product cost of revenue	$	93	$	39	$	120	$	66
Service cost of revenue	469		159		704		289
Research and development	1,160		738		1,787		1,296
Sales and marketing	1,752		1,011		3,626		1,763
General and administrative	1,316		1,275		3,613		2,784
	$	4,790	$	3,222	$	9,850	$	6,198

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LEASES (Tables)

6 Months Ended

Jun. 30, 2021

Leases [Abstract]

Schedule of Right-of-use Lease Assets and Lease Liabilities

The Company's right-of-use lease assets and lease liabilities at June 30, 2021 and December 31, 2020 were as follows (in thousands):

	Classification	June 30, 2021		December 31, 2020
Assets:
Operating lease assets	Operating lease right-of-use assets	$	57,869	$	69,757
Finance lease assets*	Property and equipment, net	574		983
Total leased assets		$	58,443	$	70,740
Liabilities:
Current:
Operating	Operating lease liabilities	$	17,974	$	17,023
Finance	Accrued expenses and other	709		902
Noncurrent:
Operating	Operating lease liabilities, net of current	62,615		72,614
Finance	Other long-term liabilities	253		568
Total lease liabilities		$	81,551	$	91,107

* Finance lease assets were recorded net of accumulated depreciation of $2.3 million and $1.9 million at June 30, 2021 and December 31, 2020, respectively.

Schedule of Components of Lease Expense

The components of lease expense for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands):

	Three months ended				Six months ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Operating lease cost*	$	5,194	$	5,217	$	14,031	$	8,561
Finance lease cost:
Amortization of leased assets	180		319		409		638
Interest on lease liabilities	20		47		46		102
Short-term lease cost	3,270		5,629		6,562		11,124
Variable lease costs (costs excluded from minimum fixed lease payments)**	500		635		2,658		1,272
Sublease income	(199)		(320)		(475)		(564)
Net lease cost	$	8,965	$	11,527	$	23,231	$	21,133

* Operating lease costs for the six months ended June 30, 2021 included $3.4 million of accelerated amortization for certain assets partially or fully vacated in 2021 with no intent or ability to sublease. Operating lease costs for the six months ended June 30, 2020 included $0.1 million of accelerated amortization for certain assets partially or fully vacated in 2020 with no ability to sublease. The Company did not record accelerated amortization in the three months ended June 30, 2021 or 2020.

** Variable lease costs for the six months ended June 30, 2021 included accruals of $1.4 million for all future estimated variable expenses related to certain assets partially or fully vacated in 2021 with no intent or ability to sublease. No such variable costs were accrued in the three months ended June 30, 2021 or in the three and six months ended June 30, 2020.

Cash flow information related to the Company's leases for the six months ended June 30, 2021 and 2020 was as follows (in thousands):

	Six months ended
	June 30, 2021		June 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	10,997	$	7,844
Operating cash flows for finance leases	$	46	$	102
Financing cash flows for finance leases	$	507	$	668

Other information related to the Company's leases as of June 30, 2021 and December 31, 2020 was as follows:

	June 30, 2021		December 31, 2020
Weighted average remaining lease term (years):
Operating leases	6.49		6.59
Finance leases	1.35		1.70
Weighted average discount rate:
Operating leases	5.71	%	5.67	%
Finance leases	5.09	%	6.15	%

Schedule of Future Minimum Fixed Lease Payments Under Noncancelable Operating Leases

Future minimum fixed lease payments under noncancelable leases at June 30, 2021 were as follows (in thousands):

	June 30, 2021
	Operating		Finance
	leases		leases
Remainder of 2021	$	11,326	$	422
2022	20,323		511
2023	17,530		63
2024	9,704		—
2025	7,791		—
2026 and beyond	31,353		—
Total lease payments	98,027		996
Less: interest	(17,438)		(35)
Present value of lease liabilities	$	80,589	$	961

Schedule of Future Minimum Fixed Lease Payments Under Noncancelable Finance Leases

Future minimum fixed lease payments under noncancelable leases at June 30, 2021 were as follows (in thousands):

	June 30, 2021
	Operating		Finance
	leases		leases
Remainder of 2021	$	11,326	$	422
2022	20,323		511
2023	17,530		63
2024	9,704		—
2025	7,791		—
2026 and beyond	31,353		—
Total lease payments	98,027		996
Less: interest	(17,438)		(35)
Present value of lease liabilities	$	80,589	$	961

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BASIS OF PRESENTATION - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021 USD ($) country	Dec. 31, 2020 USD ($) segment	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) country	Jun. 30, 2020 USD ($)
Product Warranty Liability [Line Items]
Number of countries | country	35			35
Restricted cash, current	$ 2,646	$ 7,269		$ 2,646
Cash received from the sale of certain accounts receivable	32,100		$ 30,700	63,200	$ 45,800
Interest expense	200		$ 300	400	$ 400
Restricted Short-term Bank Deposits
Product Warranty Liability [Line Items]
Restricted cash, current	$ 2,600			$ 2,600
Restricted cash		2,700
Tax Payment on Certain Fixed Assets
Product Warranty Liability [Line Items]
Restricted cash		$ 4,600
Operating Segments
Product Warranty Liability [Line Items]
Number of operating segments | segment		2

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BASIS OF PRESENTATION - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	$ 211,210	$ 210,493	$ 403,982	$ 368,475
Total cost of revenue	82,783	87,226	165,008	154,684
Total gross profit	128,427	123,267	238,974	213,791
Research and development	46,797	51,796	94,207	94,091
Sales and marketing	34,881	33,898	72,099	64,869
General and administrative	12,734	15,094	28,287	32,299
Amortization of acquired intangible assets		14,669		29,003
Acquisition-, disposal- and integration-related	1,052	857	2,249	13,241
Restructuring and related	2,830	5,361	8,780	7,436
Total operating expenses	115,475	121,675	238,626	240,939
Income (loss) from operations	12,952	1,592	348	(27,148)
Prior presentation
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		210,493		368,475
Total cost of revenue		98,176		174,588
Total gross profit		112,317		193,887
Research and development		51,796		94,091
Sales and marketing		37,617		73,968
General and administrative		15,094		32,299
Amortization of acquired intangible assets		0		0
Acquisition-, disposal- and integration-related		857		13,241
Restructuring and related		5,361		7,436
Total operating expenses		110,725		221,035
Income (loss) from operations		1,592		(27,148)
Amounts reclassified
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		0		0
Total cost of revenue		(10,950)		(19,904)
Total gross profit		10,950		19,904
Research and development
Sales and marketing		(3,719)		(9,099)
General and administrative
Amortization of acquired intangible assets		14,669		29,003
Acquisition-, disposal- and integration-related
Restructuring and related
Total operating expenses		10,950		19,904
Income (loss) from operations		0		0
Product
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	113,129	120,862	211,018	196,761
Total cost of revenue	46,641	50,579	91,086	86,558
Product | Prior presentation
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		120,862		196,761
Total cost of revenue		61,529		106,462
Product | Amounts reclassified
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue
Total cost of revenue		(10,950)		(19,904)
Service
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	98,081	89,631	192,964	171,714
Total cost of revenue	$ 36,142	36,647	$ 73,922	68,126
Service | Prior presentation
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		89,631		171,714
Total cost of revenue		36,647		68,126
Service | Amounts reclassified
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue
Total cost of revenue

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ECI ACQUISITION - Narrative (Details) - USD ($) shares in Millions		3 Months Ended	6 Months Ended		12 Months Ended
	Nov. 14, 2019	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Net cash consideration			$ 0	$ 346,852,000
Term Loan Facility
Business Acquisition [Line Items]
Commitments from lender	$ 400,000,000
Revolving Credit Facility
Business Acquisition [Line Items]
Commitments from lender	100,000,000
ECI
Business Acquisition [Line Items]
Proceeds from sale of real estate assets	$ 33,400,000
Revenue		$ 63,600,000		93,600,000
Net loss		$ 17,100,000		$ 20,400,000
ECI
Business Acquisition [Line Items]
Common stock to be issued (in shares)	32.5
Fair value of stock issued	$ 108,600,000				$ 108,550,000
Net cash consideration	322,500,000				346,852,000
Repayment of ECI outstanding debt obligations	183,300,000				183,266,000
Payment to selling shareholders	$ 139,200,000				$ 139,244,000
Weighted average useful life of intangible assets (in years)			12 years 4 months 17 days

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ECI ACQUISITION - Summary of Preliminary Allocation of Purchase Consideration (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	Nov. 14, 2019	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Cash consideration:
Net cash consideration		$ 0	$ 346,852
Fair value of assets acquired and liabilities assumed:
Goodwill		$ 416,892	$ 416,892	$ 416,892	$ 224,896
ECI
Cash consideration:
Repayment of ECI outstanding debt obligations	$ 183,300			183,266
Cash paid to selling shareholders	139,200			139,244
Payment to selling shareholders from sale of ECI real estate assets				33,400
Less cash and restricted cash acquired				(9,058)
Net cash consideration	322,500			346,852
Fair value of Ribbon stock issued	$ 108,600			108,550
Fair value of total consideration				455,402
Fair value of assets acquired and liabilities assumed:
Current assets, net of cash and restricted cash acquired				120,203
Property and equipment				54,913
Goodwill				191,996
Other noncurrent assets				37,528
Deferred revenue				(4,369)
Other current liabilities				(146,618)
Deferred revenue, net of current				(3,726)
Deferred tax liability				(13,308)
Other long-term liabilities				(46,117)
Fair value of assets acquired and liabilities assumed				455,402
ECI | In-process research and development
Fair value of assets acquired and liabilities assumed:
Intangible assets				34,000
ECI | Developed technology
Fair value of assets acquired and liabilities assumed:
Intangible assets				111,900
ECI | Customer relationships
Fair value of assets acquired and liabilities assumed:
Intangible assets				116,000
ECI | Trade names
Fair value of assets acquired and liabilities assumed:
Intangible assets				$ 3,000

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ECI ACQUISITION - Unaudited Pro Forma Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenue	$ 210,493	$ 393,682
Net loss	$ (9,252)	$ (48,381)
Loss per share (in dollars per share)	$ (0.06)	$ (0.33)

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ECI ACQUISITION - Summary of Acquisition Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Professional and services fees (acquisition-related)	$ 143	$ 640	$ 143	$ 13,014
Professional and services fees (disposal-related)	0	0	241	0
Integration-related expenses	909	217	1,865	227
Total	$ 1,052	$ 857	$ 2,249	$ 13,241

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SALE OF KANDY COMMUNICATIONS BUSINESS (Details) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	Feb. 19, 2021 day $ / shares	Dec. 01, 2020 USD ($) day $ / shares shares	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Increase in fair value of investments				$ (9,171)	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Kandy Communications Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration from sale		$ 45,000
Principal amount of debentures		$ 1
Number of warrants acquired (in shares) | shares		1
Number of shares entitled from warrant (in shares) | shares		100
Par value of common stock (in dollars per share) | $ / shares		$ 0.0001
Number of AVCT Units acquired (in shares) | shares		43,778
Interest rate		10.00%
Debenture, conversion price (in dollars per share) | $ / shares		$ 3.45
Debenture, stock price trigger (in dollars per share) | $ / shares	$ 6.00	$ 6.00
Debenture, number of trading days | day	40	40
Debenture, number of consecutive trading days | day	60	60
Amount from option to redeem debentures		$ 5,000
Threshold amount raised in offering		$ 50,000
Number of shares of common stock entitled from warrants (in shares) | shares		4,377,800
Exercise price of warrants (in dollars per share) | $ / shares		$ 0.01
Fair value of AVCT units		$ 84,900	$ 106,000	106,000		$ 115,200
Fair value of debentures		66,300
Fair value of warrants		18,600
Net assets sold		$ 1,300
Gain on sale				83,600
Increase in fair value of investments			12,100	11,800
Loss partially offset principal of the debentures			$ 1,200	$ 2,700

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EARNINGS (LOSS) PER SHARE (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reconciliation of weighted average shares outstanding from basic to diluted
Weighted average shares outstanding—basic (in shares)	147,467	144,483	146,706	132,737
Potential dilutive common shares (in shares)	6,693	0	0	0
Weighted average shares outstanding—diluted (in shares)	154,160	144,483	146,706	132,737
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included in computation of diluted loss per share (in shares)	100
Options, Restricted and Performance-based Stock and Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities not included in computation of diluted loss per share (in shares)		13,700	12,100	13,700

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INVENTORY (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
On-hand final assemblies and finished goods inventories	$ 49,725	$ 46,921
Deferred cost of goods sold	1,752	1,165
Gross inventory	51,477	48,086
Less noncurrent portion (included in other assets)	(4,921)	(2,336)
Current portion	$ 46,556	$ 45,750

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INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets and Amortization (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Intangible Assets And Goodwill
Weighted average amortization period (years)	9 years 2 months 1 day	9 years 2 months 1 day
Cost	$ 614,250	$ 614,250
Accumulated amortization	229,898	196,894
Net carrying value	384,352	417,356
Estimated future amortization expense for intangible assets
Remainder of 2021	33,621
2022	60,449
2023	53,966
2024	46,899
2025	40,338
2026	36,489
Thereafter	112,590
Total	384,352
In-process research and development
Intangible Assets And Goodwill
Cost	34,000	34,000
Accumulated amortization	0	0
Net carrying value	$ 34,000	$ 34,000
Developed technology
Intangible Assets And Goodwill
Weighted average amortization period (years)	7 years 11 months 4 days	7 years 11 months 4 days
Cost	$ 306,380	$ 306,380
Accumulated amortization	162,811	143,050
Net carrying value	$ 143,569	$ 163,330
Customer relationships
Intangible Assets And Goodwill
Weighted average amortization period (years)	11 years 10 months 9 days	11 years 10 months 9 days
Cost	$ 268,140	$ 268,140
Accumulated amortization	63,222	50,627
Net carrying value	$ 204,918	$ 217,513
Trade names
Intangible Assets And Goodwill
Weighted average amortization period (years)	3 years 10 months 17 days	3 years 10 months 17 days
Cost	$ 5,000	$ 5,000
Accumulated amortization	3,135	2,487
Net carrying value	$ 1,865	$ 2,513
Internal use software
Intangible Assets And Goodwill
Weighted average amortization period (years)	3 years	3 years
Cost	$ 730	$ 730
Accumulated amortization	730	730
Net carrying value	$ 0	$ 0

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INTANGIBLE ASSETS AND GOODWILL - Schedule of Changes in Carrying Value of Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021
Goodwill [Roll Forward]
Goodwill. beginning of period	$ 224,896
Goodwill, end of period	416,892
Accumulated impairment losses	167,406	$ 167,406
ECI
Goodwill [Roll Forward]
Acquisition	191,996
Cloud and Edge
Goodwill [Roll Forward]
Goodwill. beginning of period	224,896
Goodwill, end of period	224,896
Accumulated impairment losses	167,406	167,406
Cloud and Edge | ECI
Goodwill [Roll Forward]
Acquisition	0
IP Optical Networks
Goodwill [Roll Forward]
Goodwill. beginning of period	0
Goodwill, end of period	191,996
Accumulated impairment losses	0	$ 0
IP Optical Networks | ECI
Goodwill [Roll Forward]
Acquisition	$ 191,996

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INTANGIBLE ASSETS AND GOODWILL - Schedule of Components of Goodwill (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill, gross	$ 584,298		$ 584,298
Accumulated impairment losses	(167,406)		(167,406)
Goodwill	416,892	$ 416,892	416,892	$ 224,896
Cloud and Edge
Goodwill [Line Items]
Goodwill, gross	392,302		392,302
Accumulated impairment losses	(167,406)		(167,406)
Goodwill	224,896		224,896	224,896
IP Optical Networks
Goodwill [Line Items]
Goodwill, gross	191,996		191,996
Accumulated impairment losses	0		0
Goodwill	$ 191,996		$ 191,996	$ 0

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ACCRUED EXPENSES AND OTHER (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Employee compensation and related costs	$ 40,208	$ 66,039
Other	49,554	68,826
Total accrued expenses	$ 89,762	$ 134,865

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WARRANTY ACCRUALS - Changes in Accrual Balance (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at January 1, 2021	$ 14,855
Current period provisions	605
Settlements	(2,761)
Balance at June 30, 2021	$ 12,699

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WARRANTY ACCRUALS - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Guarantees and Product Warranties [Abstract]
Accrued expenses and other	$ 5.8	$ 6.5
Other long-term liabilities	$ 6.9	$ 8.4

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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021 USD ($) employee	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) employee	Jun. 30, 2020 USD ($) segment employee	Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Accelerated amortization of lease assets due to cease-use	$ 0	$ 0		$ 3,368	$ 70
Long-term portion of accrued restructuring	1,900			1,900		$ 800
2020 Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net of adjustments	$ 1,900	4,700		$ 2,300	$ 5,800
Number of positions eliminated | employee	15			25	75
Credit offset				$ 670
Restructuring and related cost, expected cost	$ 2,000			2,000
2020 Restructuring Initiative | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net of adjustments	1,900	4,700	$ 1,100	2,600
Credit offset				0
2020 Restructuring Initiative | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net of adjustments				400
Credit offset				670
2019 Restructuring Initiative
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net of adjustments	$ 900	$ 700		6,500	$ 1,700
Number of positions eliminated | segment					5
Accelerated amortization of lease assets due to cease-use				3,400
2019 Restructuring Initiative | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net of adjustments					$ 700
2019 Restructuring Initiative | Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net of adjustments				3,100	1,000
Accelerated amortization of lease assets due to cease-use				$ 3,400	$ 100

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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Components of Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring and Related Activities [Abstract]
Severance and related costs	$ 1,926	$ 4,716	$ 2,595	$ 6,487
Variable and other facilities-related costs	904	645	2,817	879
Accelerated amortization of lease assets due to cease-use	0	0	3,368	70
Restructuring and related expense	$ 2,830	$ 5,361	$ 8,780	$ 7,436

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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Accrual Activity for Severance and Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Initiatives charged to expense	$ 2,830	$ 5,361	$ 8,780	$ 7,436
Facilities
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			800
Balance at the end of the period	1,900		1,900
2020 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			6,493
Initiatives charged to expense			2,977
Adjustments for changes in estimate			(670)
Cash payments			(5,127)
Balance at the end of the period	3,673		3,673
2020 Restructuring Initiative | Severance
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			5,237
Initiatives charged to expense			2,595
Adjustments for changes in estimate			0
Cash payments			(4,178)
Balance at the end of the period	3,654		3,654
2020 Restructuring Initiative | Facilities
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			1,256
Initiatives charged to expense			382
Adjustments for changes in estimate			(670)
Cash payments			(949)
Balance at the end of the period	$ 19		$ 19

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RESTRUCTURING AND FACILITIES CONSOLIDATION INITIATIVES - Assumed Restructuring Initiative Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Initiatives charged to expense	$ 2,830	$ 5,361	$ 8,780	$ 7,436
2019 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			939
Initiatives charged to expense			6,473
Reclassify accelerated amortization to operating lease liabilities			(3,368)
Cash payments			(2,116)
Balance at the end of the period	1,928		1,928
Severance | 2019 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			173
Initiatives charged to expense			0
Reclassify accelerated amortization to operating lease liabilities			0
Cash payments			(173)
Balance at the end of the period	0		0
Facilities
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			800
Balance at the end of the period	1,900		1,900
Facilities | 2019 Restructuring Initiative
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period			766
Initiatives charged to expense			6,473
Reclassify accelerated amortization to operating lease liabilities			(3,368)
Cash payments			(1,943)
Balance at the end of the period	$ 1,928		$ 1,928

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DEBT - Credit Facilities (Details)				6 Months Ended
	Mar. 03, 2021 USD ($)	Aug. 18, 2020 USD ($)	Mar. 03, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 14, 2019 USD ($)
2020 Credit Facility
Debt Instrument [Line Items]
Commitments from lender			$ 500,000,000
Repayments of principal in first year				$ 10,000,000
Repayments of principal in year two				20,000,000
Repayments of principal in last year				30,000,000
Default rate percentage			2.00%
Repayments of principal in year three				20,000,000
Repayments of principal in year four				20,000,000
Percentage of consolidated adjusted EBITDA	100.00%	75.00%	100.00%
2020 Credit Facility | Minimum
Debt Instrument [Line Items]
Consolidated net leverage ratio	2.75	2.25
Borrower's consolidated net leverage ratio	$ 10,000,000.0	$ 25,000,000
2020 Credit Facility | Maximum
Debt Instrument [Line Items]
Consolidated net leverage ratio	2.25	2.75
Borrower's consolidated net leverage ratio	$ 25,000,000.0	$ 10,000,000
Term Loan Facility
Debt Instrument [Line Items]
Commitments from lender						$ 400,000,000
Term Loan Facility | 2020 Credit Facility
Debt Instrument [Line Items]
Commitments from lender			$ 400,000,000
Outstanding balance				$ 385,500,000	$ 393,100,000
Revolving Credit Facility
Debt Instrument [Line Items]
Commitments from lender						$ 100,000,000
Revolving Credit Facility | 2020 Credit Facility
Debt Instrument [Line Items]
Commitments from lender			100,000,000
Revolving Credit Facility | 2020 Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding					$ 5,600,000
Letter of Credit | 2020 Credit Facility
Debt Instrument [Line Items]
Commitments from lender			30,000,000
Debt interest rate				2.50%	2.50%
Letters of credit outstanding				$ 6,400,000	$ 5,600,000
Swingline Loan | 2020 Credit Facility
Debt Instrument [Line Items]
Commitments from lender			$ 20,000,000
Term Loan Facility, Term B Loan | Additional Applicable Margin
Debt Instrument [Line Items]
Basis spread on variable rate		6.50%
Term Loan Facility, Term B Loan | 2020 Credit Facility
Debt Instrument [Line Items]
Commitments from lender		$ 75,000,000
Repayments of principal in first year		1,000,000
Repayments of principal in year two		8,000,000
Repayments of principal in last year		8,000,000
Repayments of principal in year three		8,000,000
Repayments of principal in year four		8,000,000
Repayments of principal on the maturity date		$ 66,000,000
Premium percentage from voluntary repayment		1.00%
Outstanding balance					$ 74,600,000
Debt interest rate					8.40%
Term Loan Facility, Term B Loan | 2020 Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		7.50%
Term Loan Facility, Term B Loan | 2020 Credit Facility | Prime Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Term Loan Facility, Term A Loan | 2020 Credit Facility
Debt Instrument [Line Items]
Commitments from lender		$ 325,000,000
Repayments of principal in first year		10,000,000
Repayments of principal in year two		16,000,000
Repayments of principal in last year		16,000,000
Repayments of principal in year three		16,000,000
Repayments of principal in year four		20,000,000
Repayments of principal on the maturity date		$ 244,000,000
Outstanding balance				$ 385,500,000	$ 318,500,000
Debt interest rate				3.40%	3.40%
Term Loan Facility, Term A Loan | 2020 Credit Facility | LIBOR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Term Loan Facility, Term A Loan | 2020 Credit Facility | LIBOR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		3.50%
Term Loan Facility, Term A Loan | 2020 Credit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Term Loan Facility, Term A Loan | 2020 Credit Facility | Additional Applicable Margin | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Term Loan Facility, Term A Loan | 2020 Credit Facility | Additional Applicable Margin | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
2020 Term Loan
Debt Instrument [Line Items]
Repayments of principal in first year	20,000,000
Repayments of principal in year two	20,000,000
Repayments of principal in last year	300,000,000
Repayments of principal in year three	20,000,000
Repayments of principal in year four	30,000,000
Quarterly principal payment amount	$ 74,600,000
Write off of capitalized debt issuance costs				$ 2,500,000

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DEBT - Letters of Credit and Performance and Bid Bonds (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Cash collateral	$ 2.6	$ 2.7
Various Uncommitted Facilities
Line of Credit Facility [Line Items]
Letters of credit outstanding	24.9	27.0
Letter of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding		5.6
2020 Credit Facility | Letter of Credit
Line of Credit Facility [Line Items]
Letters of credit outstanding	$ 6.4	$ 5.6

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($)	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Reclassified as an increase to interest expense over the next twelve months	$ 3,200,000
Interest Rate Swap
Derivative [Line Items]
Notional amount	400,000,000
Interest Rate Swap | Level Two
Derivative [Line Items]
Interest rate derivative - liability derivative	4,500,000		$ 10,900,000
2020 Credit Facility | Term Loan Facility
Derivative [Line Items]
Outstanding balance	$ 385,500,000		$ 393,100,000
Principal amount		$ 400,000,000
Fixed rate	0.904%

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Impact of Derivative Financial Instrument on Condensed Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (loss) recognized in other comprehensive income (loss) on derivative (effective portion)	$ (1,015)	$ (4,320)	$ 4,875	$ (13,657)
Amount reclassified from accumulated other comprehensive income (loss) to interest expense (effective portion)	810	350	1,589	160
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax, parent	$ (205)	$ (3,970)	$ 6,464	$ (13,497)

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Fair Values and Locations in the Condensed Consolidated Balance Sheet (Details) - Interest Rate Swap - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accrued expenses and other
Derivative [Line Items]
Interest rate derivative - liability derivative	$ 3,172	$ 3,157
Other long-term liabilities
Derivative [Line Items]
Interest rate derivative - liability derivative	$ 1,312	$ 7,791

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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue agreement term	1 year
Revenue recognized	$ 60.0	$ 69.0
Customer contract expected life (in years)	5 years
Deferred sales commissions capitalized	$ 4.1		$ 4.1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Disaggregation of Revenue [Line Items]
Revenue to be recognized	$ 12.0
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue to be recognized	$ 6.0
Revenue, remaining performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue to be recognized	$ 4.0
Revenue, remaining performance obligation, period

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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 211,210	$ 210,493	$ 403,982	$ 368,475
Cloud and Edge
Disaggregation of Revenue [Line Items]
Total revenue	141,421	146,907	266,843	274,938
IP Optical Networks
Disaggregation of Revenue [Line Items]
Total revenue	69,789	63,586	137,139	93,537
Product revenue
Disaggregation of Revenue [Line Items]
Total revenue	113,129	120,862	211,018	196,761
Product revenue | Cloud and Edge
Disaggregation of Revenue [Line Items]
Total revenue	64,361	72,310	114,513	126,520
Product revenue | IP Optical Networks
Disaggregation of Revenue [Line Items]
Total revenue	48,768	48,552	96,505	70,241
Product revenue | Sales to enterprise customers
Disaggregation of Revenue [Line Items]
Total revenue	24,522	35,950	47,190	63,231
Product revenue | Sales to service provider customers
Disaggregation of Revenue [Line Items]
Total revenue	88,607	84,912	163,828	133,530
Product revenue | Indirect sales through channel partner program
Disaggregation of Revenue [Line Items]
Total revenue	27,114	32,649	47,277	61,253
Product revenue | Direct sales
Disaggregation of Revenue [Line Items]
Total revenue	86,015	88,213	163,741	135,508
Service
Disaggregation of Revenue [Line Items]
Total revenue	98,081	89,631	192,964	171,714
Service revenue (maintenance)
Disaggregation of Revenue [Line Items]
Total revenue	72,437	68,623	141,142	129,691
Service revenue (maintenance) | Cloud and Edge
Disaggregation of Revenue [Line Items]
Total revenue	57,986	57,853	112,659	113,409
Service revenue (maintenance) | IP Optical Networks
Disaggregation of Revenue [Line Items]
Total revenue	14,451	10,770	28,483	16,282
Service revenue (professional services)
Disaggregation of Revenue [Line Items]
Total revenue	25,644	21,008	51,822	42,023
Service revenue (professional services) | Cloud and Edge
Disaggregation of Revenue [Line Items]
Total revenue	19,074	16,744	39,671	35,009
Service revenue (professional services) | IP Optical Networks
Disaggregation of Revenue [Line Items]
Total revenue	6,570	4,264	12,151	7,014
United States
Disaggregation of Revenue [Line Items]
Total revenue	100,534	101,607	180,114	180,004
United States | Product revenue
Disaggregation of Revenue [Line Items]
Total revenue	56,128	57,112	92,940	93,477
United States | Service revenue (maintenance)
Disaggregation of Revenue [Line Items]
Total revenue	32,816	33,651	64,422	65,117
United States | Service revenue (professional services)
Disaggregation of Revenue [Line Items]
Total revenue	11,590	10,844	22,752	21,410
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenue	59,789	60,085	114,562	99,275
Europe, Middle East and Africa | Product revenue
Disaggregation of Revenue [Line Items]
Total revenue	31,309	35,801	59,517	56,166
Europe, Middle East and Africa | Service revenue (maintenance)
Disaggregation of Revenue [Line Items]
Total revenue	20,739	19,512	40,394	34,322
Europe, Middle East and Africa | Service revenue (professional services)
Disaggregation of Revenue [Line Items]
Total revenue	7,741	4,772	14,651	8,787
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	33,750	32,833	74,883	60,165
Asia Pacific | Product revenue
Disaggregation of Revenue [Line Items]
Total revenue	19,045	21,854	44,627	36,797
Asia Pacific | Service revenue (maintenance)
Disaggregation of Revenue [Line Items]
Total revenue	10,837	7,023	20,585	14,534
Asia Pacific | Service revenue (professional services)
Disaggregation of Revenue [Line Items]
Total revenue	3,868	3,956	9,671	8,834
Other
Disaggregation of Revenue [Line Items]
Total revenue	17,137	15,968	34,423	29,031
Other | Product revenue
Disaggregation of Revenue [Line Items]
Total revenue	6,647	6,095	13,934	10,321
Other | Service revenue (maintenance)
Disaggregation of Revenue [Line Items]
Total revenue	8,045	8,437	15,741	15,718
Other | Service revenue (professional services)
Disaggregation of Revenue [Line Items]
Total revenue	$ 2,445	$ 1,436	$ 4,748	$ 2,992

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REVENUE RECOGNITION - Schedule of Customer Assets & Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Accounts receivable
Beginning balance	$ 179,331
Increase (decrease), net	(16,223)
Ending balance	163,108
Unbilled accounts receivable
Beginning balance	58,407
Increase (decrease), net	(1,648)
Ending balance	56,759
Deferred revenue (current)
Beginning balance	96,824
Increase (decrease), net	4,647
Ending balance	101,471
Deferred revenue (long-term)
Beginning balance	26,010
Increase (decrease), net	(3,974)
Ending balance	$ 22,036

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OPERATING SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable operating segments | segment			2
Segment Reporting Information [Line Items]
Total revenue	$ 211,210	$ 210,493	$ 403,982	$ 368,475
Total segment adjusted gross profit	128,989	123,465	239,798	214,146
Stock-based compensation expense	(562)	(198)	(824)	(355)
Gross profit	128,427	123,267	238,974	213,791
Adjusted EBITDA	43,054	29,550	62,706	39,091
Depreciation	(4,249)	(4,786)	(8,475)	(8,260)
Amortization of intangible assets	(17,181)	(14,669)	(33,004)	(29,003)
Stock-based compensation	(4,790)	(3,222)	(9,850)	(6,198)
Litigation costs	0	937	0	(2,101)
Acquisition-, disposal- and integration-related expense	(1,052)	(857)	(2,249)	(13,241)
Restructuring and related expense	(2,830)	(5,361)	(8,780)	(7,436)
Income (loss) from operations	12,952	1,592	348	(27,148)
Segment depreciation expense:
Depreciation expense	4,249	4,786	8,475	8,260
Cloud and Edge
Segment Reporting Information [Line Items]
Total revenue	141,421	146,907	266,843	274,938
Total segment adjusted gross profit	95,837	98,779	180,172	177,714
Adjusted EBITDA	43,536	37,497	71,866	47,236
Depreciation	(3,142)	(2,984)	(6,279)	(5,977)
Segment depreciation expense:
Depreciation expense	3,142	2,984	6,279	5,977
IP Optical Networks
Segment Reporting Information [Line Items]
Total revenue	69,789	63,586	137,139	93,537
Total segment adjusted gross profit	33,152	24,686	59,626	36,432
Adjusted EBITDA	(482)	(7,947)	(9,160)	(8,145)
Depreciation	(1,107)	(1,802)	(2,196)	(2,283)
Segment depreciation expense:
Depreciation expense	$ 1,107	$ 1,802	$ 2,196	$ 2,283

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MAJOR CUSTOMERS (Details) - Customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue | Verizon Communications Inc.
MAJOR CUSTOMERS
Concentration risk, percentage	17.00%	15.00%	16.00%	14.00%
Accounts Receivable Balance | One Customer
MAJOR CUSTOMERS
Concentration risk, percentage			17.00%		12.00%

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COMMON STOCK REPURCHASES (Details) - Repurchase Program - USD ($)	Dec. 31, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Repurchase amount authorized (up to)		$ 75,000,000
Remaining authorized repurchase amount	$ 70,500,000

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STOCK-BASED COMPENSATION PLANS - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended		12 Months Ended
	Feb. 26, 2021 shares	Mar. 16, 2020 shares	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) performance_period $ / shares shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019	Mar. 31, 2021 $ / shares
Stock-based compensation
Total intrinsic values of stock options exercised (in dollars per share) | $			$ 0	$ 100
Cash received from the exercise of stock options (in dollars per share) | $			0	24
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested | $				33,410	$ 5,165
Tax benefit from stock based compensation expense | $				1,300	$ 0
Fair value of the assumed awards attributable to future stock-based compensation expense | $			$ 34,600	$ 34,600
Expected period for unrecognized expense				2 years
RSUs
Stock-based compensation
Eligible to vest (in shares)			6,782,782	6,782,782		6,531,110
Granted (in shares)				3,087,947
Grant date fair value (in dollars per share) | $ / shares			$ 5.70	$ 5.70		$ 3.32
RSUs | Employee Bonus Program
Stock-based compensation
Percent of target cash bonus of employee				50.00%
Percent reduction of cash target bonus				50.00%
PSUs
Stock-based compensation
Eligible to vest (in shares)			5,091,366	5,091,366		6,035,931
Granted (in shares)				672,121
Grant date fair value (in dollars per share) | $ / shares			$ 2.99	$ 2.99		$ 1.56
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested | $				$ 1,500
PSUs | Bucci Stock Price PSUs
Stock-based compensation
Granted (in shares)				133,333
Performance Shares, Performance Based
Stock-based compensation
Granted percentage				60.00%		60.00%	60.00%
Number of performance periods | performance_period				3
Vesting percentage				33.33%
Percent of performance metrics achieved				200.00%
Service period				3 years
Performance Shares, Market Based
Stock-based compensation
Granted percentage				40.00%		40.00%	40.00%
Number of performance periods | performance_period				1
Percent of performance metrics achieved				200.00%
Performance period (in years)				3 years
Grant date fair value (in dollars per share) | $ / shares								$ 8.65
Performance Shares, Market Based | Market PSUs
Stock-based compensation
Grant date fair value (in dollars per share) | $ / shares			$ 13.67	$ 13.67
RSAs and RSUs
Stock-based compensation
Total fair value of restricted stock awards, restricted stock units and performance-based stock units on date vested | $				$ 8,200
Chief Executive Officer | RSUs
Stock-based compensation
Eligible to vest (in shares)		462,963
Chief Executive Officer | PSUs
Stock-based compensation
Maximum number of shares to be settled (in shares)		4,750,000
Granted (in shares)	1,333,333

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STOCK-BASED COMPENSATION PLANS - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2021
Number of Shares
Outstanding at the beginning of the period (in shares)	207,710
Exercised (in shares)	(13,602)
Expired (in shares)	(3,386)
Outstanding at the end of the period (in shares)	190,722
Vested or expected to vest (in shares)	190,709
Exercisable (in shares)	189,978
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 12.69
Exercised (in dollars per share)	1.76
Expired (in dollars per share)	17.04
Outstanding at the end of the period (in dollars per share)	13.40
Vested or expected to vest (in dollars per share)	13.40
Exercisable (in dollars per share)	$ 13.44
Weighted Average Remaining Contractual Term (years)
Outstanding	3 years 1 month 9 days
Vested or expected to vest	3 years 1 month 9 days
Exercisable	3 years 1 month 6 days
Aggregate Intrinsic Value (in thousands)
Outstanding (in dollars per share)	$ 240
Vested or expected to vest (in dollars per share)	240
Exercisable (in dollars per share)	$ 236

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STOCK-BASED COMPENSATION PLANS - Restricted Stock Awards and Units and Performance-Based Stock Units (Details)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
RSAs
Shares
Unvested balance at the beginning of the period (in shares) | shares	86,983
Vested (in shares) | shares	(86,983)
Unvested balance at the end of the period (in shares) | shares	0
Weighted Average Grant Date Fair Value
Unvested balance at the end of the period (in dollars per share) | $ / shares	$ 7.04
Vested (in dollars per share) | $ / shares	7.04
Unvested balance at end of the period (in dollars per share) | $ / shares	$ 0
RSUs
Shares
Unvested balance at the beginning of the period (in shares) | shares	6,531,110
Granted (in shares) | shares	3,087,947
Vested (in shares) | shares	(2,378,221)
Forfeited (in shares) | shares	(458,054)
Unvested balance at the end of the period (in shares) | shares	6,782,782
Weighted Average Grant Date Fair Value
Unvested balance at the end of the period (in dollars per share) | $ / shares	$ 3.32
Granted (in dollars per share) | $ / shares	8.57
Vested (in dollars per share) | $ / shares	3.19
Forfeited (in dollars per share) | $ / shares	4.18
Unvested balance at end of the period (in dollars per share) | $ / shares	$ 5.70
PSUs
Shares
Unvested balance at the beginning of the period (in shares) | shares	6,035,931
Granted (in shares) | shares	672,121
Vested (in shares) | shares	(1,525,681)
Forfeited (in shares) | shares	(91,005)
Unvested balance at the end of the period (in shares) | shares	5,091,366
Weighted Average Grant Date Fair Value
Unvested balance at the end of the period (in dollars per share) | $ / shares	$ 1.56
Granted (in dollars per share) | $ / shares	10.22
Vested (in dollars per share) | $ / shares	0.98
Forfeited (in dollars per share) | $ / shares	4.29
Unvested balance at end of the period (in dollars per share) | $ / shares	$ 2.99

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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stock-based compensation
Stock-based compensation	$ 4,790	$ 3,222	$ 9,850	$ 6,198
Product cost of revenue
Stock-based compensation
Stock-based compensation	93	39	120	66
Service cost of revenue
Stock-based compensation
Stock-based compensation	469	159	704	289
Research and development
Stock-based compensation
Stock-based compensation	1,160	738	1,787	1,296
Sales and marketing
Stock-based compensation
Stock-based compensation	1,752	1,011	3,626	1,763
General and administrative
Stock-based compensation
Stock-based compensation	$ 1,316	$ 1,275	$ 3,613	$ 2,784

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LEASES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Additional amortization expense	$ 0	$ 0	$ 3,368	$ 70
Facilities
Lessee, Lease, Description [Line Items]
Accrual for future anticipated variable lease costs	1,900		1,900		$ 800
2019 Restructuring Initiative
Lessee, Lease, Description [Line Items]
Additional amortization expense			3,400
Accrual for future anticipated variable lease costs	1,928		1,928		939
2019 Restructuring Initiative | Facilities
Lessee, Lease, Description [Line Items]
Additional amortization expense			3,400	$ 100
Expense recorded for estimated future variable lease costs			1,400
Accrual for future anticipated variable lease costs	$ 1,928		$ 1,928		$ 766

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LEASES - Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Operating lease assets	$ 57,869	$ 69,757
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property and equipment, net	Property and equipment, net
Finance lease assets	$ 574	$ 983
Total leased assets	58,443	70,740
Current:
Operating	$ 17,974	$ 17,023
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other	Accrued expenses and other
Finance	$ 709	$ 902
Noncurrent:
Operating	$ 62,615	$ 72,614
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Finance	$ 253	$ 568
Total lease liabilities	81,551	91,107
Finance lease, accumulated deprecation	$ 2,300	$ 1,900

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LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease, cost	$ 5,194	$ 5,217	$ 14,031	$ 8,561
Finance lease cost:
Amortization of leased assets	180	319	409	638
Interest on lease liabilities	20	47	46	102
Short-term lease cost	3,270	5,629	6,562	11,124
Variable lease costs (costs excluded from minimum fixed lease payments)	500	635	2,658	1,272
Sublease income	(199)	(320)	(475)	(564)
Net lease cost	8,965	11,527	23,231	21,133
Accelerated amortization			3,400	100
Variable lease cost accrued	$ 0	$ 0	$ 1,400	$ 0

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LEASES - Other Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 10,997	$ 7,844
Operating cash flows for finance leases	46	102
Financing cash flows for finance leases	$ 507	$ 668
Weighted average remaining lease term (years):
Operating leases	6 years 5 months 26 days		6 years 7 months 2 days
Finance leases	1 year 4 months 6 days		1 year 8 months 12 days
Weighted average discount rate:
Operating leases	5.71%		5.67%
Finance leases	5.09%		6.15%

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LEASES - Future Minimum Lease Payments (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Operating leases
Remainder of 2021	$ 11,326
2022	20,323
2023	17,530
2024	9,704
2025	7,791
2026 and beyond	31,353
Total lease payments	98,027
Less: interest	(17,438)
Present value of lease liabilities	80,589
Finance leases
Remainder of 2021	422
2022	511
2023	63
2024	0
2025	0
2026 and beyond	0
Total lease payments	996
Less: interest	(35)
Present value of lease liabilities	$ 961

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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)	Nov. 08, 2018 executive	Dec. 31, 2016
Loss Contingencies [Line Items]
Sale of stock grant interest			100.00%
Maximum future royalty commitment	$ 3.9
Maximum future royalty commitment	36.8
Maximum future royalty commitment, interest	$ 1.9
Number of former officers | executive		3
Minimum
Loss Contingencies [Line Items]
Royalties rates			1.30%
Minimum | LIBOR
Loss Contingencies [Line Items]
Basis spread on variable rate	1.50%
Maximum
Loss Contingencies [Line Items]
Royalties rates			5.00%
Maximum | LIBOR
Loss Contingencies [Line Items]
Basis spread on variable rate	2.75%