Customers Can Experience Technologies From Femtocell to Enhanced Business Services At Booth 3439

WESTFORD, Mass., March 18, 2008 – The wall between fixed-line and mobile is coming down. At CTIA 2008, Sonus Networks (Nasdaq: SONS) the market leader in IP-based infrastructure will demonstrate solutions that drive new revenue opportunities and solve real business issues for carriers such as flat rate pricing pressures, retaining subscribers with cool new features, extending the boundaries of the mobile network and creating a path to 4G and 3GPP Long Term Evolution (LTE). Held in Las Vegas from April 1st – 3rd, operators from around the globe will be able to see the new services that partnering with Sonus Networks can bring to their business.

"Traditional industry approaches are being deconstructed as the world advances to IP," said Hassan Ahmed, CEO, Sonus Networks. "It is the consumer that is accelerating the pace of innovation and nowhere is that more evident than in the mobile sphere. Sonus brings more than 10 years of experience to this year's CTIA with unique solutions that will give operators and their customers an edge in the market."

At this year's CTIA, Sonus is showcasing not only a next generation IP-voice solution, but the only one that has been proven to deliver quality and reliability on a real-time basis. With more than 13 billion minutes of mobile IP-Voice traffic running across its networks, Sonus has established an important presence in this rapidly growing segment of the market.

At the Sonus booth #3439, experts will be on hand to discuss how Sonus can help expand IP backbones built for data to benefit mobile voice networks. Further, Sonus will demonstrate how operators can reduce the pressures associated with long distance calling and flat rate pricing with secure IP interconnect that can define business models. Finally, for a world moving steadily toward next-generation services and 4G/LTE, Sonus will demonstrate the new opportunities offered by fixed-mobile convergence and personalized features.

From its booth, Sonus will demo the following applications:

• Any to Any Messaging: Transforms an incoming message in any format (IM, SMS/MMS, etc.) to a form the recipient prefers (SMS, email, IM etc.), bringing new levels of customization and personalization to the communications experience
• Intelligent IP Video Integration: Brings together disparate end user applications such as caller ID and television. For example, while watching television, the user is informed of an incoming call or IM on the television screen with a message pop up
• Video Share: Access to subscriber content with Sonus' Video Share and Video Exchange applications, which allow video to be exchanged between consumer handsets and PCs
• Interactive Advertising: Dining guides on an interactive map can provide information with the value-add of voice and messaging services, putting directions and the ability to make a reservation at the touch of a button
• Parental Controls: Allows parents to enforce how a child’s mobile or wire-line phone is used. Tools like curfew, time-of-day restrictions and minute allocations give parents a new way to stay involved

Editors Note

To arrange a media interview or booth visit with Sonus Networks at CTIA 2008, please contact Lucy Millington at lmillington@sonusnet.com.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of IP-voice infrastructure solutions 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-K for the period ended December 31, 2007, 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 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.