Sonus Networks to Host Conference Call to Discuss Q4 and FY2003 Financial Results

WESTFORD, Mass., January 5, 2004  – Sonus Networks (Nasdaq: SONS) has scheduled a conference call for Tuesday, January 20, 2004, at 4:45 pm Eastern to announce its Q4 and FY2003 financial results.  Sonus expects to issue its financial results after the close of the market on Tuesday, January 20, 2004.  

Date:   Tuesday, January 20, 2004
Time:  4:45 pm Eastern

To listen via telephone

Dial-in number: +1-888-793-1722 or +1-212-346-6577

To listen via the Internet

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

Replay

A telephone playback of the call will be available following the conference and can be accessed by calling +1-402-977-9140.  The access code for the replay is 21177867.  The telephone playback will be available through Tuesday, February 3, 2004.

The webcast will be available on the Sonus Networks Investor Relations site through January 20, 2005.  To access the replay of the webcast, visit the Investor Relations site at http://www.sonusnet.com.

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 (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 trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.