Sonus Networks to Host Conference Call to Discuss Q1 FY2003 Financial Results

For more information, please contact:

WESTFORD, Mass., March 31, 2003 – Sonus Networks (Nasdaq: SONS) has scheduled a conference call for Wednesday, April 9, 2003, at 4:45 pm Eastern to announce its Q1 FY2003 financial results. Sonus expects to issue its financial results after the close of the market on Wednesday, April 9, 2003.

Date: Wednesday, April 9, 2003

Time: 4:45 pm Eastern

To listen via telephone:

Dial-in number: +1-888-428-4480 or +1-651-291-0344

To listen via the Internet:

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

Replay:

A telephone playback of the call will be available following the conference and can be accessed by calling +1-800-475-6701 or +1-320-365-3844. The access code for the replay is 679791. The telephone playback will be available through Wednesday, April 23, 2003.

The webcast will be available on the Sonus Networks Investor Relations site through Wednesday, April 23, 2003. To access the replay of the webcast, visit http://www.sonusnet.com/investor.cfm.

About Sonus Networks

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network.  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.

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.