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CHELMSFORD, Mass., March 24, 2004 – At the Spring 2004 Voice on the Net (VON) Conference and Expo next week, Sonus Networks (Nasdaq: SONS), a packet voice industry leader, 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.  Spring 2004 VON is being held March 28-April 1, 2004 at the Santa Clara Convention Center in Santa Clara, CA.

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 softswitching and wireless technologies, as well as business issues facing the packet telephony industry. 
Industry experts from Sonus Networks will be participating in the following sessions:

Monday, March 29, 2004, 2:40 pm - 3:00 pm
Session: PSTN/IP Gateways and Softswitches 

Wednesday, March 31, 2004, 10:00 am - 11:15 am
Session: WiFi and 3G Working Together 

Wednesday, March 31, 2004, 1:30 pm - 2:00 pm
Session: Keynote Address

Additional information on Spring 2004 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 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 Chelmsford, Massachusetts.  For more information, visit http://www.sonusnet.com.

Sonus is a registered trademark of Sonus Networks.  Open Services Architecture, GSX9000, Insignus and Sonus Insight are trademarks of Sonus Networks.  All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.