Fast Growing Hong Kong Based Wholesale Telecom Service Provider Chooses Sonus For Its All IP Migration

WESTFORD, Mass., July 22, 2009 – Sonus Networks Inc., (Nasdaq: SONS), providing network transformation through IP communications technology, today announced that CITIC 1616, one of Asia’s leading telecom services providers specializing in wholesale services, has chosen Sonus to transform its network with next generation IP technology. The new IP-based network will enable greater capacity and efficiency leveraging the platform’s centralized routing, diverse media support and secure border control for cost effective IP peering.

Sonus Networks Global Services team will design and deliver a next-generation network to support the CITIC 1616 network’s expanding base of over 350 telecom network operators in 60 locations worldwide. The project will provide seamless migration to a SIP core and manage the legacy ISUP connections while supporting the multitude of international standards currently in use by CITIC 1616’s diverse customer base.

"As we upgrade our network, CITIC 1616 will be even better positioned to capture new customers in China, Asia and Europe,” commented Mr. Sutton Cheung, Chief Technology Officer of CITIC 1616. “Our team undertook a rigorous selection process, considering most of the global network vendors including those in Asia. We were impressed by Sonus’ robust centralized routing capabilities and their ability to provide session border security and media gateway capabilities with the same infrastructure. We support a diverse group of wireless and wired operators worldwide, so our network has to be compatible with a variety of signaling and media types."

CITIC 1616 offers voice services, mobile SMS and other value added services such as signaling transit, prepaid roaming and VAS applications, data service and telecom solutions to telecom carriers, mobile operators and ISPs. Sonus is deploying a next generation network that will centrally manage policy and routing on the CITIC 1616 network, supporting legacy TDM and next generation IP traffic on the same implementation. As their wholesale customers move toward IP environments, the CITIC 1616 investments in Sonus gateway hardware will transition to IP session border security and media transcoding.

"CITIC 1616 is one of the most admired next generation service providers in Asia," commented Mohammed Shanableh, vice president, worldwide sales for Sonus Networks. “Moving to an all IP core for voice services will allow CITIC 1616 to get enhanced services into the market more quickly and enable it to stay ahead of the competition, not only in China, but across the world.”

The network will be made up of the GSX9000™ Media Gateway, PSX™ Call Routing and Policy Server, SGX™ Signaling Gateway, the Sonus Insight™ Management System, as well as the Sonus Network Border Switch (NBS) for enhanced border security and advanced IP peering capabilities.

About CITIC 1616 Holdings Limited

CITIC 1616 is Asia’s leading telecom services provider, specializing in hub-based services. In addition to serving its key markets in China and Hong Kong, the Company is actively expanding its services to international telecom operators. The Group has 4 main business segments, namely Voice Hubbing Services, SMS Hubbing Services, Mobile VAS and VPN Services. Its independent hub connects over 350 telecom operators in 60 countries or areas. Additional news and information about the company is available at www.citic1616.com.

About Sonus Networks

Sonus Networks Inc., providing network transformation through IP communications technology, is leading the evolution of communications networks to support the multi-device demands of today’s digital lifestyle. Sonus solutions and services enable fixed, mobile and cable operators to gain session awareness and deliver multi-media capabilities essential to adding value and expanding their customer and 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 and Quarterly Report on Form 10-Q for the quarter ended March 31, 2009. 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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For more information, please contact:

Media Relations:
Lucy Millington
978-614-8240
lmillington@sonusnet.com

Racepoint Group for Sonus Networks
Shannon Breen/Katie Traut
781-487-4600
sonus@racepointgroup.com