Sonus Networks Expands Presence in Israel Through Its Partnership with TNN Networks; Israel's Leading Integrator Provides Sonus IP Multimedia Subsystems Architecture.

SWINDON, UK & PETACH TIKVA, Israel -- Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions announced its partnership with TNN Networks (TNN) to distribute, support and provide systems integration for the complete Sonus product line in Israel. Under the terms of this non-exclusive agreement, TNN is providing the Sonus IP Multimedia Subsystems (IMS) architecture to the Israeli market, including the GSX(TM) Open Services Switch, PSX(TM) Call Routing Server, SGX(TM)Signaling Gateway, ASX(TM) Access Server and the Insight(TM) Management System.

TNN Networks is a leading supplier of integrated networking solutions in Israel for some of the most advanced service provider VoIP networks, such as Bezeq, 012 Golden Lines and Netvision. The company provides high-quality end-to-end solutions for communications networks, combining some of the world's best products for building carrier class infrastructure. TNN's comprehensive solution for all types of operators includes network design, implementation, operation and optimization, customer management and support.

"By working with TNN we are able to further the adoption of next generation packet voice technologies with telecommunications providers in Israel. TNN Networks is highly regarded in the Israeli communications market and we are already working with them supporting several opportunities in this region," said Joop Van Aard, Vice President of Sales, Europe Middle East & Africa, Sonus Networks.

"Sonus is clearly recognized as one of the leading providers in next generation networks and this partnership, coupled with our technical skills and in-depth knowledge of the Israeli market, enables us to provide our carrier customers with the ability to enhance their businesses through the rapid development and delivery of highly competitive next-generation solutions," said Yossi Ron, CEO & President of TNN Networks. "We are extremely pleased to be working with Sonus on a number of opportunities and building a long lasting relationship with them."

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 15, 2005, and the "Cautionary Statements" section of Sonus' Quarterly Report on Form 10-Q, dated August 8, 2005, 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, Inc. Sonus GSX9000 Open Services Switch, PSX Call Routing Server, SGX Signaling Gateway, and the Sonus Insight Management System are trademarks of Sonus Networks, Inc. All other company and product names may be trademarks of the respective companies with which they are associated.

About TNN

TNN is a leading Israeli Value Added Reseller (VAR) with its primary business of delivering sophisticated networking solutions to Service Providers and large Enterprises. TNN specialises in supplying large VoIP networks and wide area networks of Voice, Data and Video.

TNN possesses many years of experience in setting up wide and local communication networks, including setting up and maintaining Bezeq's large TDM, ATM and FR networks, as well as other large VoIP, ATM and IP networks in Israel and abroad.