Sonus Session Border Control Solution Wins The 2009 Global Excellence In Messaging/Communication/IP Security Solution Customer Trust Award

WESTFORD, Mass., April 21, 2009 – Sonus Networks Inc., (Nasdaq: SONS), providing network transformation through IP communications technology, today announced that Info Security Products Guide, a leading publication on security-related products and technologies, has named the Sonus GSX9000™ with Sonus Network Border Switch, as the winner of the 2009 Global Product Excellence in Messaging/Communication/IP Security Solution Customer Trust Award. This Customer Trust Award is a validation of the carrier class strength of the Sonus Network Border Switch in providing IP-voice security to carriers, service providers and enterprises.

The Sonus Network Border Switch includes session border control (SBC) functionality and other services such as media handling, reliable security for IP peering and secure access connections. The Sonus Network Border Switch supports advanced security features including encryption, topology hiding, DoS/DDoS attack mitigation, toll fraud protection and quality of service safeguards. The Sonus GSX9000™ Open Services Switch solution represents an advanced next generation core switching solution for voice networks, delivering centralized call routing and network management over a scalable, distributed switch architecture that can support millions of ports in a single network.

"In an interconnected world, threats have no boundaries and security has to remain a prime requirement," says Rake Narang, editor-in-chief of Info Security Products Guide. "We are pleased to honor the Sonus GSX9000 with Sonus Network Border Switch as a security solution winner for 2009."

"The Sonus GSX9000 with Sonus Network Border Switch is proven to carry tens of thousands of simultaneous sessions with the high levels of security demanded by carriers and enterprises, in networks across the world," said Shailin Sehgal, vice president, marketing and product management at Sonus Networks. "Sonus is committed to developing innovative technology that addresses customer needs, reduces time to revenue and improves return on investment. Winning the Customer Trust Award is testament that our technology continues to deliver customer needs."

Deployed with the Sonus PSX™ Centralized Route Server, the Sonus GSX9000™ Open Services Switch forms a powerful IP softswitch solution that can scale to millions of ports in a single network. The unique design of the GSX/PSX softswitch uses very little energy and real estate (20x less than legacy switches), supports TDM and IP protocols simultaneously for a seamless migration, and provides rich transcoding for broad interoperability. The GSX series includes the GSX 4000™ low/medium-density media gateway, which can also serve as the basis for Sonus’ secure IP peering and access solution, the Sonus Network Border Switch.

About Info Security Products Guide

Info Security Products Guide is a media sponsor of RSA Conference 2009 and Technosium Executive Alliance Forums engaging Chief Information Officers (CIOs) and Chief Information Security Officers (CISOs). As a technology research and advisory publication, it plays a vital role in keeping decision makers and end-users informed of the choices they can make when it comes to protecting their digital resources. You will discover a wealth of information in this guide including tomorrow’s technology today, best deployment scenarios, people and technologies shaping info security and independent product evaluations that facilitate in making the most pertinent security decisions. The Info Security Products Guide awards recognize and honor excellence in all areas of information security. To learn more, visit www.infosecurityproductsguide.com and stay secured.

About Sonus Networks

Sonus Networks Inc., providing network transformation through IP communications technology, is leading the evolution of communications networks to support the multi-media, multi-device demands of today’s digital lifestyle. Sonus solutions and services enable fixed, mobile and cable operators to gain network awareness and new multi-media capabilities essential to retaining and expanding their subscriber base. Through standards based interoperable solutions and services, Sonus extends the investments made in traditional networks by enabling operators to seamlessly migrate to next generation technology and deliver the secure, reliable, scalable and cost-effective network needed to grow their business. For more information visit www.sonusnet.com.

This release may contain forward-looking statements regarding future events that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. For a discussion of the risks and uncertainties which could cause actual results to differ from those contained in the forward-looking statements, see “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2008. Risk factors include among others: the unpredictability of our quarterly financial results; risks and uncertainties associated with the Company's previous restatement of its historical stock option granting practices and accounting including regulatory actions; actions that may be taken by significant shareholders; risks associated with our international expansion; and the impact the current global financial market conditions may have on the telecommunications industry. Any forward-looking statements represent Sonus' views only as of today and should not be relied upon as representing Sonus' views as of any subsequent date. While Sonus may elect to update forward-looking statements at some point, Sonus specifically disclaims any obligation to do so, except as required by law.

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