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WESTFORD, Mass., March 26, 2003 – At the Spring 2003 Voice on the Net (VON) Tradeshow and Expo next week, packet voice industry leader Sonus Networks (Nasdaq: SONS) will participate in several educational panel discussions and workshops. Spring 2003 VON is being held March 31 – April 3, 2003 at the San Jose Convention Center in San Jose, CA.

The presentations delivered by Sonus Networks executives will highlight trends in packet voice infrastructure, including the latest developments in softswitch technology and the optimization of wireless networks using packet voice solutions, as well as business issues facing the packet telephony industry.

Industry experts from Sonus Networks will be participating in the following sessions:

Monday, March 31, 2003, 4:35 pm - 4:55 pm
Session: Pre-Conference Workshop: PSTN Gateways and Softswitches
Speaker: Bob Dye, vice president, strategic marketing

Tuesday, April 1, 2003, 2:00 pm - 3:15 pm
Session: Venture Capital: Market Update
Panel Chair: Rubin Gruber, founder and chairman

Wednesday, April 2, 2003, 5:15 pm - 6:30 pm
Session: 3G Wireless
Speaker: Bob Dye, vice president, strategic marketing

Additional information on Spring 2003 VON can be found at http://www.pulver.com/von/

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.

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.