Bandwidth.com Builds A Next Generation Network On Sonus Technology To Support Dramatic Growth in Demand For Its Business Services

WESTFORD, Mass., October 2, 2008 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in IP communications infrastructure, today announced that it has completed the first phase implementation of a next-generation network (NGN) deployment with Bandwidth.com. The new all IP network at Bandwidth.com will deliver secure, advanced business communications services to small and medium businesses across the United States.

Bandwidth.com is introducing a complete Sonus IP-based session control network as part of the company's business plan to become a nation-wide competitive local exchange carrier (CLEC). The first services on the Sonus-based network are already live, providing integrated access services in 300 metropolitan markets. The services include unlimited calling, Internet service and the capability to work with most enterprise phone systems at flat-rate price points.

"Our ability to serve small businesses has driven Bandwidth.com's dramatic growth," said David Morken, co-founder, CEO and president at Bandwidth.com. "We partner with Sonus because they share our vision for innovation and have a track record of delivering reliable, scalable and cost effective networks. We invest in industry leading technology, anticipating demand for our mission critical services like SIP trunking. Using Sonus infrastructure ensures that Bandwidth.com's network is optimized intelligently to provide for and ultimately capture that demand."

"Meeting the demands of enterprise customers requires secure, scalable and highly available networks," commented Mohammed Shanableh, vice president of global sales at Sonus Networks. "The Sonus portfolio of integrated solutions delivers a robust IP-based network for advanced services. The intelligent session control technology enables Bandwidth.com to make its network more resource efficient. Bandwidth.com will be able to offer its business customers a range of innovative applications such as IP Business trunks, IP Centrex and collaboration applications."

Bandwidth.com will deploy the complete, end-to-end Sonus solution, including the ASX™ Access Server, GSX9000™ Media Gateway, PSX™ Call Routing Server, SGX™ Signaling Gateway, the NBS™ Network Border Switch as the Session border controller for IP Access and Trunking and the Sonus Insight Management System.

About Bandwidth.com

Founded in 1999, Bandwidth.com is a complete nationwide communications provider offering businesses advanced Internet, VoIP, network and wireless services. As a single source provider for businesses telecom needs, Bandwidth.com provides its customers with unparalleled selection, savings and service. The company's unique methodology, experienced team and dedicated customer service, ensures accountability and service superior to that of traditional Internet and VoIP providers. Bandwidth.com has been recognized by Inc. Magazine as the only telecom service provider to be in all three Top 500 lists from 2006 to 2008 as one of the fastest growing telecommunications companies in North America. In addition the Triangle Business Journal has recognized the company as one of the best Places to work in North Carolina's Research Triangle. Learn more at http://www.bandwidth.com.

About Sonus Networks

Sonus Networks, Inc. is a market leader in IP communications infrastructure 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 Westford, Massachusetts. Additional information on Sonus is available 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 Item 1A "Risk Factors" of Sonus' Quarterly Report on Form 10-Q for the period ended June 30, 2008, 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 restatement of its historical stock option granting practices and accounting including regulatory actions; actions that may be taken by significant shareholders; risks associated with our international expansion and growth; consolidation in the telecommunications industry; and potential costs resulting from pending securities and patent 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, except as required by law.

Sonus is a registered trademark of Sonus Networks, Inc. All other company and product names may be trademarks of the respective companies with which they are associated.