Sonus Networks Addresses the Evolution of IP Multimedia Subsystem Architectures

CHELMSFORD, Mass., October 12, 2006 – Sonus Networks (Nasdaq: SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced that at this year's Voice on the Net (VON) Europe Autumn 2006 Conference and Expo, the Company will showcase its industry-leading IP Multimedia Subsystem (IMS)-ready platform, along with a variety of IMS-ready applications that demonstrate the power of IMS to redefine the communications experience through greater user control, customizability, presence-awareness and the rich integration of multimedia. These applications, built with Sonus' IMS application development tools, including the Sonus IMX™ Multimedia Application Platform, help service providers to attract and retain new customers, and differentiate themselves through innovative service bundles.

Sonus Networks offers a suite of end-to-end IMS-ready voice solutions that meet the specifications required by European network operators. In 2006, Sonus Networks has announced partnerships with leading integrators and network operators throughout the European region, including Carphone Warehouse, Cable and Wireless International, Telio, and Tradingcom Europe, to deliver highly robust and scalable next generation voice networks.

"In 2006, Sonus has increased its presence throughout Europe with a number of high profile deployments. Sonus' recent success with operators throughout Europe demonstrates that Sonus' product portfolio and services capabilities can meet the demands that are unique to the region," said Brian Partridge, Senior Analyst with Yankee Group.

In addition to Sonus' presence in the exhibit hall, at 11:00 am on November 7th, Sonus will be presenting a session entitled, “IMS Architecture to Deliver Next-Generation Services.” Leveraging the Company's early lead in the IMS-voice industry, Sonus Networks' Neil Kinder, Technical Director , EMEA, will help educate participants on the business case and technology prerequisites for leveraging IMS to deliver the types of services that will redefine the consumer communication experience.

Pulver.com's VON Europe Autumn 2006 conference begins on November 6, 2006 and will conclude on November 8, 2006. All events will be held at ICC Berlin. VON is the leading conference and exhibition for the IP communications industry and is attended by carriers, service providers, mobile operators and vendors.

For more information on VON Europe Autumn 2006, please visit http://www.voneurope.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' Quarterly Report on Form 10-Q, dated May 8, 2006, filed with the Securities and Exchange Commission, 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.