Kagoor's VoiceFlow VoIP Border Control Platform Completes Interoperability Testing with Sonus' Packet Voice Solutions, Moves to Next Level in OSPA

Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, today announced that Kagoor Networks has proven interoperability with Sonus' voice solutions and has advanced to "Powered" standing in Sonus' Open Services Partner AllianceSM (OSPA) program. Kagoor's VoiceFlow VoIP Border Control platform addresses four key areas of VoIP networking: security and firewall, bandwidth management, route optimization and monitoring/remote management.

"The OSPA's interoperability program provides carriers with a clear confidence in next-generation solutions, enabling them to deploy networks more rapidly and economically," said Michael O'Hara, vice president, marketing, Sonus Networks. "Kagoor's products offer carriers the security and NAT control that is needed between IP networks. We are very pleased that Kagoor has become our latest Sonus Powered partner, and we look forward to building on our successful partnership."

The VoiceFlow platform is an integrated software and hardware solution in a compact, standalone design that addresses a number of important VoIP border control applications including security (NAT, call admission control, NAT traversal), bandwidth management (up to 70% compression), route optimization (packet marking, QoS rerouting) and monitoring (QoS and SLA) and remote management (IP endpoints). The Voiceflow product series consists of the VoiceFlow200, 1000, and 3000 models addressing a range of configurations from economical, enterprise CPE to high capacity service provider/carrier equipment.

The OSPA's mission is to help empower standards-based interoperability between key enhanced services applications, network infrastructure, and Sonus products. Sonus' OSPA Interoperability Lab is uniquely positioned to test packet voice solutions through the use of state-of-the-art testing equipment within environmentally controlled facilities. Once an OSPA member demonstrates interoperability with a Sonus product, the partner becomes "Powered." Sonus and its "Powered" partners collaborate to deliver end-to-end packet-based network solutions using best-of-breed technologies and applications.

"We are equally pleased that our VoiceFlow series is now proven to interoperate with the Sonus Open Services Architecture," said Opher Kahane, CEO and co-founder of Kagoor. "Working together with Sonus, we deliver the critical solutions that will enable the wide-scale deployment of packet voice networks."

About Sonus' OSPA

Sonus Networks' Open Services Partner Alliance program provides a framework that offers service providers end-to-end packet-based network solutions using best-of-breed technologies and applications. The goal of the OSPA is to empower standards-based interoperability between applications, hardware vendors, and the Sonus product family. An integral part of the Sonus OSPA, the OSPA Interoperability Laboratory is the first in the industry where product interoperability is verified, trial testing is performed and complete solutions are ultimately produced. To find additional information on the OSPA, including a list of all OSPA partners, log on to http://ospa.sonusnet.com.

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services Architecture (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking, residential access and Centrex, tandem switching, and IP voice termination, as well as enhanced services. Sonus' award-winning voice infrastructure solutions, including media gateways, softswitches and network management systems, are deployed in service provider networks worldwide. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

This release may contain projections or other forward-looking statements regarding future events or the future financial performance of Sonus 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 Sonus' Quarterly Report on Form 10-Q, dated August 14, 2002 and filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. These risk factors include, among others, the adverse effect of recent developments in the telecommunications industry, the weakened financial position of many emerging service providers, Sonus' ability to grow its customer base, dependence on new product offerings, market acceptance of its products, rapid technological and market change and manufacturing and sourcing risks.

Open Services Partner Alliance is a service mark of Sonus Networks and Insignus, GSX9000 and Open Services Architecture are trademarks of Sonus Networks. All other company and product names may be trademarks of the respective companies with which they are associated.