UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

March 29, 2007

Date of Report (Date of earliest event reported)

iBASIS, INC.

(Exact Name of Registrant as Specified in Charter)

DELAWARE	000-27127	04-3332534
(State or Other Jurisdiction	(Commission File Number)	(IRS Employer
of Incorporation)		Identification No.)

20 Second Avenue, Burlington, MA 01803

(Address of Principal Executive Offices) (Zip Code)

(781) 505-7500

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01 Other Events.

In October 2006, iBasis, Inc. (the “Company”) announced that it had received an informal inquiry from the Securities and Exchange Commission (the “SEC”) relating to its stock option practices. On March 29, 2007, the SEC staff notified the Company that it will receive a formal order of investigation. The Company has cooperated and will continue to cooperate with the SEC.

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 hereunto duly authorized.

Date: March 30, 2007	IBasis, Inc.


	By:	/s/ Mark S. Flynn
		Chief Legal Officer
		& Corporate Secretary