Sonus Solutions Designed to Help Network Operators Stay Current with Emerging E911, CALEA, and other Safety Initiatives

CHELMSFORD, Mass., November 1, 2006 - Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced today that in response to the recently formed Public Safety and Homeland Security (“PSHS”) Bureau, a division of the Federal Communications Commission, the Company is helping network operators comply with the rapidly evolving emergency communications landscape through its industry-leading and field-proven next generation voice infrastructure.

In a prepared statement issued on September 26, 2006 (http://www.fcc.gov/pshs/), the Bureau reported, “The events of September 11, 2001 and last year's hurricane season underscored America's dependence on an effective national telecommunications infrastructure. The new bureau will build on the Commission's longstanding commitment to meet the needs of public safety by promoting robust, reliable and resilient communications services in times of emergency.”

Through the development of sophisticated, standards-based IP Multimedia Subsystem (IMS)-ready solutions and partnerships with leading industry innovators, Sonus Networks provides network operators with a wide range of solutions necessary to stay current with emerging policies around Enhanced 911, operability and interoperability for public safety communications, communications infrastructure protection, network security and reliability.

“IP-based voice is no longer an emerging technology. It is penetrating the market at a significant pace, and as such, needs to live up to stringent standards that help ensure public safety,” said Teresa Mastrangelo, Principal Analyst with Broadbandtrends.com. “By employing a distributed, standards-based approach, Sonus Networks' solutions enable carriers to not only address today's concerns, but also provide a platform that is robust and flexible enough to stay current with the evolving landscape.”

In May 2005, Sonus announced that to enable the delivery of E-911 services, Sonus' GSX9000™ Open Services Switch and the Insignus™ Softswitch support the Centralized Automatic Message Accounting (CAMA) signaling standard, as well as ISDN and SS7. The support of this signaling standard allows service providers to interconnect with Public Safety Answering Points (PSAPs) around the country. The ability to reach these facilities in the event of an emergency is critical for dispatching emergency response services, or transferring or relaying 911 calls to other public safety agencies.

Sonus is also pioneering the next generation of IMS-ready applications, both natively on its IMX multimedia application platform and through partnerships with members of Sonus' Open Services Partner Alliance (OSPA), an industry organization designed to test the interoperability of leading Session Initiation Protocol (SIP)-based products and services with Sonus' IMS-ready architecture. As a result, network operators can quickly build and deploy a wide variety of new applications, including warning and alert applications such as “Call Blast”, a call feature that allows non-commercial organizations to contact communities of interest. This type of application can be used in a variety of ways, such as in emergency situations to create a “reverse 911” capacity or to notify impacted areas of upcoming weather alerts.

In addition, because Sonus has pioneered the development of IP-based voice network and leads the market both in terms of market share and the number of minutes carried on its networks, Sonus' solutions, which are designed for 99.999% network availability, have been field-proven in some of the world's most advanced networks. Sonus solutions are tailored to meet the specific needs and demands of a wide variety of network operators, including traditional telecommunications providers, wireless carriers, information service providers (ISPs), and facilities-based cable companies.

“Communications services play an invaluable role in the every day life of consumers, and in emergency situations in particular, having access to reliable voice network is critical,” said Hassan Ahmed, chairman and CEO, Sonus Networks. “As a customer-centric organization, Sonus is deeply committed to helping network operators that have deployed Sonus solutions stay current with emerging policies and regulations that impact public safety.”

Additional information about the Public Safety and Homeland Security Bureau can be found on the FCC website at http://www.fcc.gov/pshs/.

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' Quarterly Report on Form 10-Q, dated May 8, 2006, filed with the SEC, which identifies 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 and uncertainties associated with the Company's announced review of its historical stock option grants and accounting, including any potential impact of the Company's financial statements or results, the Company's inability to timely report with the Securities and Exchange Commission, the Company's potential inability to meet NASDAQ requirements for continued listing, potential investigations or litigation arising out of the review or any restatement; 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.