SONUS NETWORKS FOUNDER AND CHIEF TECHNOLOGY OFFICER TO PRESENT AT RAYMOND JAMES 27TH ANNUAL INSTITUTIONAL INVESTORS CONFERENCE

CHELMSFORD, Mass., December 27, 2005 - Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced today that Sonus Networks' Founder and Chief Technology Officer, Mike Hluchyj, will be participating at the following upcoming event with the financial community:

Raymond James 27th Annual Institutional Investors Conference
Orlando, FL
Tuesday, March 7, 2006, at 1:40 PM
Speaker: Mike Hluchyj, Founder and CTO

To view a webcast of this event and other financial conferences, or to obtain a schedule of upcoming events, please visit the Sonus Networks Investor Relations site at http://www.sonusnet.com/contents/corporate/investorrelations.cfm.

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 comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the full range of carrier applications, including residential and business voice services, wireless voice and multimedia, trunking and tandem switching, carrier interconnection and enhanced services. Sonus' voice infrastructure solutions are deployed in service provider networks worldwide. Founded in 1997, Sonus is headquartered in Chelmsford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

Sonus is a registered trademark of Sonus Networks, Inc

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