Exhibit 99.1


           Sonus Networks Announces Termination of SEC Investigation


    CHELMSFORD, Mass.--(BUSINESS WIRE)--June 8, 2005--Sonus Networks
(Nasdaq: SONS), a leading supplier of service provider voice over IP
(VoIP) infrastructure solutions, announced that it has received
written notification from the Securities and Exchange Commission
regarding the formal inquiry that the SEC undertook in connection with
the Company's previously announced independent investigation of its
financial reporting. The SEC has notified the Company that its
investigation has been terminated and that no enforcement action has
been recommended.

    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 and Insignus are trademarks of Sonus Networks.
All other trademarks, service marks, registered trademarks, or
registered service marks are the property of their respective owners.


    CONTACT: Investor Relations:
             Jocelyn Philbrook, 978-614-8672
             jphilbrook@sonusnet.com
             or
             Media Relations:
             Laureen McGowan, 617-275-6515
             lmcgowan@greenoughcom.com