VON Magazine Recognizes the Demand for Next-Generation IP-Voice and Multimedia Services by Naming Sonus to the Innovator Awards Listing

Westford, Mass., March 20, 2008 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in IP communications infrastructure, today announced that it has received a 2008 VON Magazine Innovator Award. The awards acknowledge the most innovative companies representing the future of the Internet communications industry. Sonus has been recognized for the advanced technology offered in its IMX 2.0 solution, a groundbreaking platform that provides support for wireless, video and other multimedia applications and services.

"The VON Magazine Innovator Awards recognize the Internet Communications industry's best and brightest companies, and we're pleased to include Sonus Networks as a winner," said Bill Sell, Publisher, VON Media Group. "Companies like Sonus should take pride in their accomplishments as they represent the future of IP communications."

"We are committed to advancing innovation within our customers, and this drives us to constantly develop new solutions. It is a great privilege to receive the VON Magazine Innovator Award, as it validates our ability to provide market leading, innovative IP-based solutions," said Vikram Saksena, chief technology officer Sonus Networks. "Network operators ask us to solve the business challenges posed by the rapidly evolving communications landscape. The IMX 2.0 enables the world's carriers to quickly get monetized services to consumers and enterprises, by delivering the power of Web 2.0 through a robust-IP based solution."

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' vision of next-generation communications entails the real-time delivery of advanced voice and multimedia services, while optimizing the network to provide required safety and traditional call features.

The ceremony announcing the VON Magazine Innovator Award winners was held at Spring VON.X, in San Jose, CA on March 18th in the VON Theatre on the Expo floor. Also at the show, Sonus expert Bob Bradley will be participating on a panel discussing the current and future threats against IP-security as well the solutions network operators and enterprises can implement to ensure the best possible protection from threats. The panel will take place on Thursday, March 20 at 3:00 pm PT.

About IMX 2.0

IMX 2.0 enables network operators to embrace a Web-based model for application development; specifically, the ability to develop new applications quickly, rollout to a test audience, and scale as consumer demand validates the application. This process represents a dramatic shift from traditional telecom application development, which was resource and time intensive, and as a result, limited experimentation. For test applications that do show promise, IMX 2.0 is a carrier-grade platform that supports high levels of scalability and delivers applications over Sonus' field-hardened IP core.

IMX 2.0 is designed and built to enhance privacy while providing operators with the control they expect and require. When combined with Sonus' Network Border Switch, operators are able to securely deliver advanced IP-based features across network boundaries. Together, this advanced software helps carriers future-proof their networks. The ability to securely connect networks and deliver next-generation applications to the consumer or enterprise worker will allow the deployment of services more quickly with lower operational expenses and faster time-to-market.

IMX 2.0 supports a broad range of applications and devices that are interoperable with Sonus' platform today, while providing a robust foundation for the support of wireless and video applications. This simple, easy-to-manage platform was designed specifically to address network operators' most pressing business needs and provides support for the combination of traditional and advanced voice services in a highly secure IP framework.

About the VON Magazine Innovator Awards

Building on the legacy of the Pulver 100, the VON Innovator Awards have evolved to recognize all companies – start-ups to publicly-traded companies - which represent the future of Internet Communications. Each participating company completed a lengthy and comprehensive nomination process, and the recipients have been selected from a committee made up of VON Magazine editors, columnists, and contributors, as well as the leading content producer for the VON.x conferences. The Inaugural VON Magazine Innovator Award winners will be honored at Spring VON.x at 6:00 PM Pacific time on March 18th in the VON Theatre in San Jose. For additional information, please visit: http://vonmag.com/innovators/.

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-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.