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WESTFORD, Mass., March 3, 2003 – Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure solutions for the new public network, and Stratecast Partners, a respected telecommunications industry research firm, will host a webcast presentation on Thursday, March 13, 2003 at 10:00 am EST.

In the presentation, Jim Lawrence, program director, Convergence Strategies & Network Architectures at Stratecast Partners, will provide an overview of the wireless market and the market factors driving the adoption of packet voice technologies by wireless operators. Bob Dye, Sonus' vice president of strategic marketing, will outline Sonus' strategy for the wireless market and discuss Sonus' newly introduced SMARRTTM Wireless solutions, highlighting how wireless carriers can gain a competitive advantage through packet voice.

Date: Thursday, March 13, 2003

Time: 10:00 am EST

To listen via the Internet:

Sonus will host a live webcast of the conference call. To access the webcast, visit Sonus' Investor Relations site at http://www.sonusnet.com/investor.cfm.

Replay:

A replay of the webcast will be available on the Sonus Networks Investor Relations site through Thursday, March 27, 2002. To access the replay of the webcast, go to Sonus' Investor Relations site at http://www.sonusnet.com/investor.cfm.

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services ArchitectureTM (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.

SMARRT and Open Services Architecture are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.