X0306 4 2015-03-16 0001105472 SONUS NETWORKS INC SONS 0001615890 Riley Kevin W. C/O SONUS NETWORKS, INC. 4 TECHNOLOGY PARK DRIVE WESTFORD MA 01886 0 1 0 0 VP Engineering & CTO Common Stock 2015-03-16 4 A 0 52500 0 A 74950 D Performance-Based Restricted Stock Units (PSUs) 2015-03-16 4 A 0 17500 0 A Common Stock 17500 17500 D These are restricted shares of Common Stock that vest over a three-year period as follows: one-third of the shares shall vest on March 16, 2016. The remaining two-thirds of the shares shall vest in four equal increments semi-annually thereafter through March 16, 2018. Each PSU represents a contingent right to receive one share of the Issuer's Common Stock, based on the Issuer's total shareholder return (TSR) compared to pre-established relative TSR goals, based on the TSR of the NASDAQ Telecommunications Index, that were set by the Compensation Committee of the Issuer's Board of Directors. The aggregate number of shares issued may range from zero (0) shares to 120% of the target number of shares reported in columns 7 and 9 of this report. The PSUs will vest, if at all, on March 16, 2016, March 16, 2017 and March 16, 2018. Kevin W. Riley 2015-03-17