Integrated PacketCable 2.0 Solution To Accelerate Adoption Of New Subscriber Services and Drive Revenue

Westford, MA., June 18, 2008 – Sonus Networks (Nasdaq: SONS), a market leader in IP communications infrastructure, today announced the completion of interoperability testing of its PacketCableTM 2.0 compliant portfolio of products with Camiant, Inc., the leading provider of policy control and application assurance technology, and its PacketCable Multimedia (PCMM) compliant policy server. The integrated solution will enable cable providers to more rapidly migrate their networks - from the basic triple play of voice, video and data to next generation services. For cable customers, this will mean a higher quality of service where voice communications are not disrupted by the demands of other high bandwidth services such as file transfers, IPTV or video sharing.

Broadband Trends reports that over 13 million U.S. households received their telephone service from a cable operator at the end of 2007, a 68% increase from 2006. As many of these subscribers already have both Internet and TV, policy management to ensure that each service is delivered without interruption is a critical part of existing and future deployments of voice and video services. Now, cable providers are turning to the IP Multimedia System (IMS) to offer multi-media services that include video and mobile devices.

"The cable industry has a history of being aggressive; first deploying high-speed Internet services, then adding digital voice for a triple play and now offering new services with PacketCable 2.0. Camiant is an established leader in policy control and Sonus recognized the importance of partnering with Camiant so that cable providers can integrate multiple services seamlessly," said Michael Rubin, vice president of Cable & Wireline Solutions at Sonus Networks. "To win subscribers in this competitive market, the cable industry needs to have the tools to innovate successfully and deliver the demands of today's customers, while investing in and wisely managing their networks for tomorrow."

"Camiant believes that a superior policy management solution assures a superior subscriber experience," said Susie Riley, CTO and Founder of Camiant. "As MSOs add new services and migrate to IMS, policy becomes even more important as the number of services offered through the same pipe increases. Our partnership with Sonus means that our cable customers can seamlessly leverage their existing deployments of Camiant's policy server with Sonus' PacketCable 2.0 infrastructure to move forward confidently with next-generation voice and multimedia deployments today."

Sonus Networks' solutions are deployed in six of the world's top ten telecommunication providers and at cable operators in the Americas, Europe and Japan. Sonus offers a comprehensive IMS solution that addresses the full range of carrier applications, including residential and business voice services. The tested Sonus/Camiant integration includes support for existing deployments and it is designed to facilitate the evolution of cable providers' networks to IMS -- the industry blueprint for a true all-IP network with advanced applications. Testing included:

• Sonus ASX(TM) Call Server for residential and business telephony services supporting DQOS and 3GPP compliant ISC interface
• Sonus SRX providing the industries most advanced platform for the 3GPP Call / Session Control Function with 3GPP and PacketCable compliant Rx interface
• Sonus NBS providing advanced security and media control in conjunction with an 3GPP compliant P-CSCF and the IMS Border elements
• Sonus IMX providing a PacketCable compliant service development platform that allows operators to create PacketCable Multimedia compliant enabled applications that combine the power of SIP, Web 2.0 with enablers such as presence and messaging

Camiant's Multimedia Policy Engine (MPE) enables real-time quality of service control for VoIP calls and other services over cable's DOCSIS® high-speed data network. The software-based solution allows multiple system operators (MSOs) to rapidly deploy IP voice based services for residential and business customers. Camiant's MPE has already been deployed at several of the largest cable operators worldwide.

About Camiant

Camiant's policy control solution empowers broadband service providers to open their networks and deliver a significantly higher quality of service to subscribers by guaranteeing superior performance of rich, high-bandwidth services such as video, streaming media, online games and commercial services. Leveraging its deep expertise in policy management and application assurance, Camiant seamlessly enables broadband service providers to deliver high performing user experiences as new, innovative multimedia services continue to enter the market with increasing unpredictability.

Camiant's market-leading policy control software platform is the solution of choice for service providers who want to reduce OPEX and CAPEX, increase ARPU and reduce churn by improving the user experience. By delivering predictable performance of new multimedia applications, Camiant has become the trusted source for delivering policy control and application assurance to service providers globally. For more information, visit http://www.camiant.com

About Sonus Networks

Sonus Networks, Inc. is a market leader in IP communications infrastructure for wireline and wireless service providers. With its comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the full range of carrier applications, including residential and business voice services, wireless voice and multimedia, trunking and tandem switching, carrier interconnection and enhanced services. Sonus' voice infrastructure solutions are deployed in service provider networks worldwide. Founded in 1997, Sonus is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://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. Readers are referred to Item 1A "Risk Factors" of Sonus' Quarterly Report on Form 10-Q for the period ended March 31, 2008, filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Risk factors include among others: the impact of material weaknesses in our disclosure controls and procedures and our internal control over financial reporting on our ability to report our financial results timely and accurately; the unpredictability of our quarterly financial results; risks and uncertainties associated with the Company's restatement of its historical stock option granting practices and accounting including regulatory actions or litigation; risks associated with our international expansion and growth; consolidation in the telecommunications industry; and potential costs resulting from pending securities and patent litigation against the Company. 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.

Sonus is a registered trademark of Sonus Networks, Inc. All other company and product names may be trademarks of the respective companies with which they are associated.

DOCSIS(TM) and PacketCableTM Multimedia are trademarks of Cable Television Laboratories, Inc.