Sonus Networks Wins 2001 Comet Award From Communication Systems Design Magazine

WESTFORD, Mass., September 25, 2001 – Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, today announced that it has been named a recipient of a 2001 Comet Award. Sonus will be presented the award by Communication Systems Design magazine at an awards banquet on October 2nd, held in conjunction with the Communications Design Conference (October 1-4, San Jose Convention Center).

The Comet Awards recognize up and coming communications technology companies that have demonstrated superior achievement by virtue of their innovation, technical vision and risk-taking. Sonus was selected for the award from a field of 70 emerging communications companies by a panel of editors from industry publications Communication Systems Design, Embedded Systems Programming, Commsdesign.com and EE Times.

"We are extremely gratified to have been selected as a Comet award winner," said Terri Griffin, vice president, marketing, Sonus Networks. "This award reinforces Sonus' leading position in the market for next-generation voice solutions, and highlights Sonus as a company that is driving a major transformation in the communications industry."

"In today's dynamic and challenging market environment, Sonus stands out as a player that combines the right mix of technology, vision and focus to make a mark. We're proud to honor Sonus with our second annual Comet award, and look forward to charting their success in the future," said Rob Keenan, editor-in-chief of Communication Systems Design magazine.

About Communication Systems Design

Communication Systems Design (http://www.csdmag.com) is the magazine for engineers and managers involved in the design and development of communications systems and equipment. The magazine focuses on the leading-edge wired, optical and wireless technologies employed in the development of personal, home/soho, enterprise, and infrastructure systems and equipment. With a qualified circulation of 50,000 communications engineers and managers, Communication Systems Design is published by CMP Media LLC.

About Sonus

Sonus Networks, Inc. is a leading provider of voice infrastructure products for the new public network. Sonus' solutions enable service providers to deploy an integrated network capable of carrying both voice and data traffic, and to deliver a range of innovative, new services. The Sonus Open Services Architecture (OSA) and award-winning Packet Telephony suite cut the time-to-market for competitive new service products, allowing carriers and third-party developers to expand marketshare and build important new revenue streams. Its highly scalable products fully interoperate with and extend the life and utility of today's public network. Sonus embodies in its management and staff decades of experience in developing carrier-class voice, data and multimedia solutions for implementation in the world's largest networks. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

Open Services Architecture is a trademark of Sonus Networks. All other company and product names may be trademarks of the respective companies with which they are associated.

For more information:

pr@sonusnet.com