Caribbean Telecommunications Service Provider Deploys End-To-End Sonus Solution for its Next Generation of Voice Service Offerings

TeleBermuda International Limited Chooses Complete Sonus Architecture for Enhanced Service Capabilities

CHELMSFORD, Mass., June 20, 2006 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, and TeleBermuda International Limited (TBI), announced today that TBI has deployed a complete IP Multimedia Subsystem (IMS)-ready architecture from Sonus as the foundation of its next generation voice network. This end-to-end network will support TBI's comprehensive service offerings, including wholesale voice service, converged voice and data solutions and international long distance service to the residential and business market delivered over Broadband (VoBB) for customers throughout Bermuda. TBI migrated from its legacy network to Sonus' next generation switching platform in April 2006 and has plans to expand service into additional markets including the Cayman Islands.

"TeleBermuda International is 100% focused on providing our customers with the best possible telecommunications services, and Sonus is our first choice to deliver the complete end-to-end solution that we need. This will enable TBI to continue to offer reliable, innovative and highly robust services that the marketplace expects. The Sonus infrastructure will provide TBI with significant competitive advantages, as it will assist us in streamlining our operations and provide TBI with state of the art switching capability," said Greg Swan, Executive Vice President and Chief Operating Officer of TBI.

TeleBermuda International is deploying a full suite of Sonus' IMS-ready solutions, including Sonus' GSX4000 Open Services Switch and the ASX™ Feature Server. The GSX4000 is the industry's first innovative compact VoIP switch designed to deliver carrier-class functionality, reliability and manageability and was developed specifically for service providers serving less densely populated areas, those looking to expand their network, or service providers seeking additional support for IP-based multimedia services. TBI is utilizing Sonus' Network Border Switch, one of the industry's most sophisticated solutions for addressing session control, PSTN gateway services and security requirements in a single, high performance system.

"The TeleBermuda network is a great example of the value that Sonus provides to competitive service providers," said Hassan Ahmed, chairman and CEO, Sonus Networks. "By deploying a complete IMS-ready architecture from Sonus, including the GSX4000™ compact media gateway that was specifically designed for service providers like TBI that serve smaller geographic regions, TBI can leverage both the cost-efficiencies of a Sonus-based long distance network and the robust service capabilities of Sonus' Voice over Broadband solution."

About TeleBermuda International

TBI is a leading Bermuda-based international telecommunications carrier providing long distance voice, data, commercial Internet and co-location hosting services. During its ten years of operation in Bermuda, TBI has become recognized as a leading cost-effective supplier of telecommunication services, and has been responsible for delivering competitive pricing and services for the commercial, residential and international carrier services markets. TBI products and services include: TBiNET, a dedicated Internet service; International Private Leased Circuits; International Frame Relay Service; a world-class Server Co-location facility; business continuity and disaster recovery services; as well as its international long-distance voice communication service. For more information please visit the Company website at http://www.telebermuda.com.

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.

This release may contain forward-looking statements regarding future events that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. Readers are referred to the "Risk Factors" section of Sonus' Annual Report on Form 10-K, dated March 14, 2006 and Quarterly Report on Form 10-Q, dated May 8, 2006, both filed with the SEC, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Risk factors include among others: the impact of material weaknesses in our disclosure controls and procedures and our internal control over financial reporting on our ability to report our financial results timely and accurately; the unpredictability of our quarterly financial results; risks associated with our international expansion and growth; consolidation in the telecommunications industry; and potential costs resulting from pending securities litigation against the company. Any forward-looking statements represent Sonus' views only as of today and should not be relied upon as representing Sonus' views as of any subsequent date. While Sonus may elect to update forward-looking statements at some point, Sonus specifically disclaims any obligation to do so.

Sonus is a registered trademark of Sonus Networks. All other company and product names may be trademarks of the respective companies with which they are associated.