Ribbon Communications Inc - Ordinary Shares 10-K 2015 FY Annual report

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-61940, 333-66982, and 333-194701 on Form S-3 and Registration Statement Nos. 333-43334, 333-53970, 333-54932, 333-105215, 333-124777, 333-150022, 333-163684, 333-170285, 333-183562, 333-190318, and 333-194207 on Form S-8 of our reports dated February 23, 2016, relating to the financial statements of Sonus Networks, Inc., and the effectiveness of the Sonus Networks, Inc.'s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Sonus Networks, Inc. for the year ended December 31, 2015.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

February 23, 2016