REMINDER/Sonus Networks Schedules Q4 and Fiscal 2004 Financial Release

    Business Editors/High-Tech Editors
    REMINDER...

    CHELMSFORD, Mass.--(BUSINESS WIRE)--March 15, 2005--Sonus Networks (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, today announced that it has scheduled a conference call for Tuesday, March 15, 2005, at 8:00 am Eastern to announce its Q4 and FY2004 financial results. Financial results are expected to be issued before the open of the financial markets.

    Conference Call Logistics:

    Date: Tuesday, March 15, 2005

    Time: 8:00 am Eastern

    To listen via telephone:
    Dial-in number: (800) 633-8680 or (212) 231-6032

    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 (402) 977-9140. The reservation number for the replay is 21235464. The telephone playback will be available through Monday, March 28, 2005.
    A replay of the webcast will be also available on the Sonus Networks Investor Relations site through Wednesday, March 15, 2006. 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 voice over IP (VoIP) infrastructure solutions for wireline and wireless service providers. With its Open Services Architecture(TM) (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.

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CONTACT: Sonus Networks Investor Relations: Jocelyn Philbrook, 978-614-8672 jphilbrook@sonusnet.com Media Relations: Sarah McAuley, 617-894-2807 smcauley@greenoughcom.com

KEYWORD: MASSACHUSETTS INDUSTRY KEYWORD: TELECOMMUNICATIONS REMINDER CONFERENCE CALLS SOURCE: Sonus Networks, Inc.

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