FOR IMMEDIATE RELEASE: NOVEMBER 28, 2017

WESTFORD, Mass. – Sonus Networks, Inc . (Nasdaq: SONS), a global leader in secure and intelligent cloud communications, today announced that following the recent completion of the Sonus and GENBAND mergers, the ticker symbol of the company’s common stock on the Nasdaq Global Select Market will change to “RBBN” effective upon the commencement of trading on Wednesday, November 29, 2017.

The company also announced that its corporate name will officially change to Ribbon Communications Inc., effective at 5:00 p.m. Eastern Time (ET), November 28, 2017.

A Closing Bell ceremony celebrating the change will take place at 4:00 p.m. ET on November 29, 2017 at Nasdaq MarketSite at 4 Times Square in New York City. Ray Dolan, President and Chief Executive Officer; David Walsh, former Chief Executive Officer of GENBAND and Founder of Kandy ; Daryl Raiford, Chief Financial Officer, and other senior executives will be in attendance.

“Today is a significant milestone for our newly combined organization,” said Mr. Dolan. “The entire Ribbon Communications team is excited about our enhanced ability to deliver value to our customers, partners and shareholders as we deliver market-leading real-time communications and security solutions across the globe.”

Mr Dolan added, “Our new name is not just about connecting point “a” to point “b”. It reflects our strong desire to continue moving the real-time communications industry forward by dramatically improving the communications experience and encompassing the ability to ensure our contact points are elegantly and seamlessly simple to create, manage and monitor. Ribbon Communications serves as the connection across all of our worlds.”

About the Company

Sonus Networks, Inc. (d/b/a Ribbon Communications) is a company with two decades of leadership in real-time communications. Built on world class technology and intellectual property, the company delivers intelligent, secure, embedded real-time communications for today’s world. The company transforms fixed, mobile and enterprise networks from legacy environments to secure IP and cloud-based architectures, enabling highly productive communications for consumers and businesses. With 64 locations in 27 countries around the globe, the company’s innovative, market leading portfolio empowers service providers and enterprises with rapid service creation in a fully virtualized environment. The company’s Kandy Communications Platform as a Service (CPaaS) delivers a comprehensive set of advanced embedded communications capabilities that enables this transformation. To learn more, visit ribboncommunications.com.

Sonus Networks, Inc. is currently registered to do business as Ribbon Communications in various jurisdictions but is formally changing its legal name to Ribbon Communications Inc., effective at 5:00 p.m. Eastern Time (ET), November 28, 2017.