European Competitive Telecommunications Association

Westford, MA, February 20, 2009 – Sonus Networks, (Nasdaq: SONS), a market leader in IP communications infrastructure, has strengthened its IP Business Trunking solutions with SIPconnect 1.0 compliant status from the SIP Forum, a leading IP communications industry association, for the Sonus Network Border Switch.

The Sonus Network Border Switch is a carrier class session border control solution that resides in a media gateway platform, enabling centralized routing, powerful media transcoding and enhanced security.  The Sonus Network Border Switch has a unique architecture that allows service providers to more cost effectively deploy all IP based connections to enterprise IP-PBXS.  SIPconnect compliance reconfirms Sonus’ commitment to industry standards that ease network transformation for customers.  

“The dramatic growth in communication choices provides enterprises with new options to enhance their workforce’s productivity,” commented Marc Robins, managing director of the SIP Forum.  “Interoperability is the single biggest hurdle to widespread adoption of new IP communications products and services. The SIP Forum established the SIPconnect framework to make it easier for enterprises to bridge IP from the service providers’ core to the end users desktop, enhancing quality and enabling new service creation.”  

“The Sonus Network Border Switch has already proved its value in the market, supporting thousands of IP business trunks,” commented Shailin Sehgal, vice president marketing and product management at Sonus Networks.  “The recognition of compliance with SIPconnect further demonstrates that Sonus is delivering an enhanced, standards-based solution for access border security.  Sonus can offer service providers a path to transform their networks to all IP, from the core to the edge.”

With Sonus IP Business Trunks, service providers can create a single broadband connection for voice and data, providing a more cost effective and efficient connection.  This connection can help to drive new revenue through innovative services.  Because the Sonus IP Business Trunk is a direct IP-to-IP pipeline between the core network and enterprise-based IP-PBX, service providers can quickly deliver hosted, secure services to enterprise customers without the need for additional Class 5 infrastructure.

The SIPconnect Technical Recommendation, an initiative of the SIP Forum, is a standards-based approach that provides detailed guidelines for direct IP peering and interoperability between IP PBXs and VoIP service provider networks. The associated SIPconnect Compliant Certification Program, through which eligible companies can gain SIPconnect validation and the right to license the use of the SIP Forum's 'SIPconnect Compliant' certification mark, helps to validate interoperability among equipment manufacturers, software providers and service providers, as well as to promote further adoption of SIP as the standard for IP communications.

About the SIP Forum
The SIP Forum is an IP communications industry association that engages in numerous activities that advance and promote SIP technology, such as the development of industry technical recommendations, the SIPit interoperability and testing events, special interoperability and educational workshops, and general promotion of SIP in the industry. For more information, please visit:

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

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 our Annual Report on Form 10-K for the year ended December 31, 2007 and all subsequent Quarterly Reports on Form 10-Q, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Risk factors include among others: the Company’s ability to align its cost structure with market conditions, 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; 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.

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.

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