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WESTFORD, Mass., September 16, 2003 – At the Fall 2003 Voice on the Net (VON) Tradeshow and Expo next week, packet voice industry leader Sonus Networks (Nasdaq: SONS) will highlight technology trends in packet voice infrastructure and related services. In the Sonus Networks exhibit, the company will feature live demonstrations of its packet-based voice solutions and enhanced services, including hosted PBX, voice conferencing, prepaid calling and messaging. Fall 2003 VON is being held September 22-25, 2003 at the Hynes Convention Center in Boston, MA.

Sonus is also taking an active role in the educational portion of the conference. The presentations delivered by Sonus Networks executives will emphasize trends in packet voice infrastructure including the latest developments in softswitch technology, as well as business issues facing the packet telephony industry.

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

Monday, September 22, 2003, 11:05 am - 11:25 am
Session: PSTN/IP Gateways and Softswitches
Speaker: Michael Rubin, director, product management

Wednesday, September 24, 2003, 10:45 am - 12:00 pm
Session: Staying Alive: Dealing with VCs in 2003
Speaker: Rubin Gruber, founder and chairman

Thursday, September 25, 2003, 3:45 pm - 5:00 pm
Session: Softswitch Update
Speaker: Michael O'Hara, vice president, marketing

Additional information on Fall 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 solutions for wireline and wireless service providers. With its Open Services Architecture(TM) (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.

Sonus is a registered trademark of Sonus Networks. 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.