Interoperability Testing Between Two Companies Facilitates Rapid Roll Out of Consumer VoIP Services

SAN JOSE, CA, and CHELMSFORD, MA, March 15, 2006 – At Spring VON 2006 (Booth #517), Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider voice over IP (VoIP) infrastructure solutions, announced today, it has teamed with NETGEAR®, Inc., a worldwide provider of technologically advanced, branded networking products to streamline the adoption and usage of leading consumer VoIP solutions. The two companies have conducted interoperability testing between Sonus' Voice over Broadband (VoBB) platform and NETGEAR's line of broadband phone adapters, which will enable customers to access next generation consumer lifestyle services.

“The future of the telephony industry is no longer about simple voice services. In order to be successful, service providers are building solutions that combine voice and data to deliver a previously unmatched array of consumer services,” said Hassan Ahmed, chairman and CEO, Sonus Networks. “Today's leading voice over broadband services are powered by Sonus' platform. By teaming with NETGEAR, a strong international brand in both wired and wireless consumer electronics, we're helping to make these new services more accessible to consumers.”

Sonus' IMS-ready architecture supports the industry's most extensive portfolio of next generation applications, and offers an open, flexible framework for the rapid deployment of future applications, including high margin services such as presence-driven applications, fixed-to-mobile services, and other solutions that leverage the power of IP-based architectures. The NETGEAR Broadband Voice Adapter with Router streamlines access to these services. Customers simply plug an ordinary telephone and their cable or digital subscriber line (DSL) modem into the NETGEAR Broadband Voice Adapter; installation and set-up is through NETGEAR's intuitive user interface, Smart Wizard™.

“VoIP has moved passed the early adopter phase heralded by a small, tech-savvy segment of the population, and is now being embraced by average consumers looking to take advantage of the cost savings and access to exciting new services,” Teresa Mastrangelo, Principal Analyst with Broadbandtrends.com. “Sonus has proven itself to be a leader in the field, and teaming with a well-known consumer brand like NETGEAR offers the company additional credibility and visibility with end users.”

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, 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.