Sonus Networks to Hold Conference Call to Discuss Q2 FY2003 Financial Results

For more information, please contact:

WESTFORD, Mass., June 30, 2003  – Sonus Networks (Nasdaq: SONS) has scheduled a conference call for Thursday, July 10, 2003, at 5:30 pm Eastern to announce its Q2 FY2003 financial results. Sonus expects to issue its financial results after the close of the market on Thursday, July 10, 2003.

Date: Thursday, July 10, 2003

Time: 5:30 pm Eastern

To listen via telephone:

Dial-in number: +1-877-260-8897 or +1-612-332-1213
Confirmation number: 689406

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/corporate/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 689406. The telephone playback will be available through Thursday, July 24, 2003.

The webcast will be available on the Sonus Networks Investor Relations site through Thursday, July 24, 2003. To access the replay of the webcast, visit http://www.sonusnet.com/corporate/investor.cfm.

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.