WESTFORD, Massachusetts and STAINES, England, February 18 /PRNewswire/ --

- Sonus Networks Part Of PathFinder Programme To Foster Interoperability

Sonus Networks (Nasdaq: SONS), a market leader in IP communications infrastructure, today announced that its solutions for wireless carriers have been certified as part of PathFinder, the GSMA-managed service operated by NeuStar. The PathFinder initiative is dedicated to the simple delivery of IP-based services to fixed and mobile networks, reducing the cost and complexity of providing innovative new services.

PathFinder is based on Carrier ENUM technology, facilitating an interoperable, industry-wide solution which enables the routing of global IP service interconnect traffic. The service acts as a central directory where operators share IP and fixed-line addresses to allow swift and cost-effective routing of packet voice, instant messaging (IM), multimedia services, email and video. By assisting the linking of an IP address to a phone number for mobile devices, fixed-line phones and IP devices, the delivery of IP-based services is made easier.

As a PathFinder Industry Partner, Sonus Networks is pleased to be part of an important initiative which seeks to promote the introduction of new services and revenue streams, said Shailin Sehgal, vice president of marketing and product management at Sonus Networks. Sonus is committed to building interoperable solutions to help carriers migrate seamlessly from legacy systems to their next generation network. Protecting return on previous investments while positioning for future subscriber growth and new services is more important than ever for carriers in the current economic climate.

Sonus Networks is an important addition to the community of next generation network providers, added Steve Edwards, senior vice president of Converged Addressing at NeuStar. As the PathFinder service moves into production, it is key to carriers planning their networks that leading industry players such as Sonus are certified interoperable with PathFinder.

About NeuStar

NeuStar (NYSE: NSR) provides market-leading and innovative services that enable trusted communication across networks, applications, and enterprises around the world. For more information, visit www.neustar.biz.

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: US Media Contact: EMEA Media Contact: Shannon Breen Lauren Bishop/Lucia Barbato +1-781-487-4607 +44(0)20-7107-2479/2480 sonus@racepointgroup.com sonus.team@catalysis.co.uk

US Media, Shannon Breen, +1-781-487-4607, sonus@racepointgroup.com, or EMEA Media, sonus.team@catalysis.co.uk, Lauren Bishop, +44-0-20-7107-2479 or Lucia Barbato, +44-0-20-7107-2480, all for Sonus Networks, Inc.