Sonus joins partner NK Networks to showcase Fixed/Mobile Convergence

SWINDON, UK, March 9, 2006 - Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, will be joining its partner NK Networks & Services at CeBIT 2006, March 9 - 15, Hanover, Germany, to showcase its range of IMS (IP Multimedia Subsystem)-ready next generation networks solutions, including Fixed/Mobile Convergence and Border Switching. The companies will be located in Hall 13, Booth C76/1.

CeBIT is the ideal showcase for the two companies' partnership, which combines NK Networks' well respected design and integration skills with Sonus' leading IMS-ready infrastructure solutions.

At the show, Sonus will be presenting and discussing the latest technologies for carrier IP-to-IP peering, VoIP security, cost-effective residential services, advanced service creation tools and turnkey applications for in-demand services.

“This is further demonstration of Sonus' commitment to the European market and our local partner NK Networks & Services,”commented Joop van Aard, Vice President, Sales - Europe, Middle East and Africa, Sonus Networks.“Together we can offer European carriers a complete package of products and services, as they migrate to next-generation networks.”

CeBIT 2006 begins on Thursday, March 9th, 2006, and concludes on Wednesday, March 15, 2006. The event takes place at the Exhibition Grounds, Hanover, Germany. CeBIT 2006 is one of the industry's top events, presenting on topics relevant to the new digital world.

About NK Networks & Services

NK Networks & Services focuses on designing, delivering and maintaining next-generation networking technology that helps customers extend and maintain their competitive momentum. With its excellent team of technical experts and consultants, NK Networks & Services established itself as the leading systems integration and service partner for large enterprises and service providers in the Central European Region.

With its HQ in Cologne and offices in Berlin, Dortmund, Frankfurt, Hamburg, Hannover, Munich, Nuremberg and Stuttgart, NK Networks & Services employs 140 people and a German-wide service network. Since 1985, NK Networks & Services has been implementing local as well as wide area networks and largely influenced the evolution of modern data communications. Among others, freenet, EWE Tel, QSC, Tiscali, Munich and Frankfurt airports and the German parliament are clients as well as companies across a wide range of industries including banks, insurance companies, utility companies, city carriers, transportation companies, the public sector and universities. For more information: http://www.nknetworks.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 15, 2005, and the “Cautionary Statements” section of Sonus' Quarterly Report on Form 10-Q, dated November 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. All other company and product names may be trademarks of the respective companies with which they are associated.