Mobile SecurEdge Provides Low-cost, Secure Platform To Support Multiple Standards For Multi-lateral IP Interconnects

Westford, MA, and Staines, UK, February, 16, 2009 – Sonus Networks, (Nasdaq: SONS), a market leader in IP communications infrastructure, today announced the launch of Mobile SecurEdge, a secure IP-peering solution which brings mobile operators the benefits of end-to-end IP connectivity for international roaming and national peering traffic, ultimately providing their end-user customers with greater security, appropriate billing and higher quality for real-time services.

Mobile operators are quickly realizing the cost and performance benefits IP offers in the network. However, as they migrate to all-IP, they require unique solutions that enable them to interconnect legacy equipment with next-generation IP-core technology. Paramount to meeting this challenge is ensuring these connections are made seamlessly, in a cost–effective, highly scalable and efficient manner.

The Sonus Mobile SecurEdge solution provides wholesale carriers with a GSMA-compliant IPX proxy interconnect platform supporting multiple standards for signaling, network interworking and legacy TDM interworking. In this way, wholesale carriers can offer their mobile network operator customers best-in-class interworking solutions via Mobile SecurEdge platform connection to their IPX hubs.

"In a world that becomes more connected each day, IPX interworking is essential to driving the efficiency of our communications," commented Shailin Sehgal, vice president marketing and product management at Sonus Networks. "Interworking between different signaling standards enables mobile operators to connect via the IPX’s multi–lateral interconnects without having to implement the complex interworking themselves. Sonus is committed to providing our customers with innovative solutions that support this evolution."

As multimedia communications services evolve such as GSMA’s Rich Communications Suite (RCS) for presence-enabled phone books with instant messaging, voice and video content exchanges, the Sonus Mobile SecurEdge is ready to support these.

The Mobile SecurEdge solution builds on Sonus’ scalable, carrier class trunking and IP peering platforms including the GSX9000™ Open Services Switch, the PSX™ Call Routing Server and Sonus' Network Border Switch for enhanced border security, carrying 40 Billion MoU per month across 150+ operators. Deployed in mobile operators IP cores it provides signalling interworking, border security and Gateway MSC (GSM and IS41) functions and within carriers carrier networks it provides arbitrage of least cost routed traffic both through IP and TDM peering, with comprehensive billing/settlement, O&M and performance management to optimise the IP interconnect solution.

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 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.

For more information, please contact:

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

EMEA Media Contact:
Lauren Bishop/Lucia Barbato
+44 (0) 20 7107 2479/2480
sonus.team@catalysis.co.uk