Sonus Networks Announces General Availability of Newest Network Border Switch

WESTFORD, Mass., August 6, 2007 – Demonstrating its commitment to transforming communications, Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, today launched the latest version of its Network Border Switch designed to deliver secure connectivity between enterprises and operators, as well as secure connectivity between disparate operators' networks. This tested and validated solution delivers secure business critical voice applications seamlessly across boundaries. When combined with Sonus' trunking, access or wireless solutions, network operators are now able to offer robust network security for all of their voice communications.

Today's voice networks are strategic assets that enable network operators to unlock their investments in Internet Protocol (IP) network to introduce new services rapidly. With the number and sophistication of security threats increasing on a global basis, network operators need a solution that delivers proven business benefits, flexibility in service creation and prevents incidents and disruptions caused by security breaches.

The Sonus Network Border Switch is architecturally designed to improve connectivity between disparate IP networks and allow operators to gain protection, control and visibility over those accessing their networks. Government regulations also add to the growing emphasis on security and the ability of operators to reliably meet evolving regulatory standards.

Ideal for network operators with IP-voice networks at their borders, Sonus solutions not only deliver robust security at the edge of the network, but meet the stringent government regulations, such as Communications Assistance for Law Enforcement Act, (CALEA®), Government Emergency Telecommunications Service (GETS) and Enhanced 911 or E911. The introduction of the latest Network Border Switch signals a significant milestone in the evolution of IP-voice communications, which now not only deliver integrated, advanced technology solutions to address critical business issues, but also do so with increased security.

"Adoption of IP technology began in the core of major networks and is working its way out to the edge, requiring a robust peering and security solution that leverages the advantages of IP to interconnect with other network operators," said Vikram Saksena, Chief Technology Officer. "Like the Sonus platform as a whole, the NBS is unique in the market in terms of its ability to scale effectively without sacrificing quality and reliability, which is absolutely essential to maintaining the integrity of the network."

The latest release of the Sonus Network Border Switch, available on both the GSX^™9000 and GSX^™4000 platforms, includes new features to support direct media, Denial of Service (DoS) protection for access networks and consumer VoIP deployments, advanced encryption support for call set-up, and additional Secure Real Time Protocol (RTP) to protect call content. In addition, the platform upgrade includes new features for advanced management and Operational System Support (OSS) functionality. Additional information about the new features and functionality of the NBS can be found on the Sonus website at http://www.sonusnet.com/contents/products/bordercontrol/nbs.cfm.

The strength of Sonus' NBS solution was recently verified by CT Labs (see related press release "Network Border Switch from Sonus Networks Provides Sophisticated, Carrier-Class Security Solutions For Today’s IP Voice Networks" at http://www.sonusnet.com/?page=1&cat=6&subcat=1200&prod=0&info=0&tab=2&archive=0&newsid=516.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice over IP (VoIP) 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-Q dated May 8, 2006, 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 announced review of its historical stock option grants and accounting, including the impact on the Company's financial statements or results, any tax liabilities or penalties, the Company's inability to timely report with the Securities and Exchange Commission, whether the Company will remain listed on the NASDAQ Global Select Market and regulatory actions or litigation arising out of the review or any restatement; 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.

The information in this press release is for informational purposes only and is subject to change at Sonus’ sole discretion without notice. Sonus has no obligation or commitment to develop or deliver any future release, upgrade, feature, enhancement or function described in this release. The information is provided "AS IS," with all faults, and without any warranties whatsoever, express or implied, including, but not limited to, warranties of merchantability, performance, or fitness for a particular purpose.

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.