Sonus Networks' Conference Call for Q1 FY2002 Financial Results

For more information, please contact:

Investor Relations:
Jocelyn Lynds
978-589-8672
jlynds@sonusnet.com
Media Relations:
Beth Morrissey
978-589-8579
bmorrissey@sonusnet.com

WESTFORD, Mass., April 2, 2002 – Sonus Networks (Nasdaq: SONS) has scheduled a conference call for Tuesday, April 9, 2002, at 5:00 pm Eastern to announce its Q1 FY2002 financial results. Financial results are expected to be issued after the close of the market on Tuesday, April 9, 2002.

Date: Tuesday, April 9, 2002

Time: 5:00 pm Eastern

To listen via telephone:

Dial-in number: (800) 582-6982 or (212) 346-6449

To listen via the Internet:

Sonus will host a live webcast of the conference call. To access the webcast, visit www.sonusnet.com, Corporate, Investor Relations.

Replay:

A telephone playback of the call will be available following the conference and can be accessed by calling (800) 633-8284 or (858) 812-6440. The reservation number for the replay is 20468576. The telephone playback will be available through Tuesday, April 23, 2002.

A replay of the webcast will be also available on the Sonus Networks Investor Relations site through Tuesday, April 23, 2002. To access the replay of the webcast, visit www.sonusnet.com, Corporate, Investor Relations.

About Sonus Networks

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