CHELMSFORD, Mass., April 28, 2004 – Sonus Networks (Nasdaq: SONSE) today announced that Hassan Ahmed, Sonus’ chief executive officer and chairman, will be participating at the following investor conference:

32nd Annual J.P. Morgan Technology & Telecom Conference
San Francisco, CA
Thursday, May 6, 2004, 11:30 am Pacific
Speaker:  Hassan Ahmed, CEO and chairman
Webcast Link: http://equityconferences.jpmorgan.com/

Interested investors can access a live audio webcast of the presentation via the link provided above or on the Investor Relations section of the Sonus Networks website at www.sonusnet.com.  A replay of the webcast will be available 24 hours after the presentation.  A full schedule of Sonus Networks’ investor activities is available on the Sonus Networks Investor Relations site

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice over IP (VoIP) infrastructure solutions for wireline and wireless service providers.  With its Open Services Architecture (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking and tandem switching, residential and business access, network border switching and enhanced services. Sonus’ 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.  Additional information on Sonus is available at 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.