Sonus Networks Showcases Next Generation Applications at CTIA WIRELESS 2007


Fixed-Mobile Convergence, Presence, and Personalization Driving the Next Wave of Innovation

WESTFORD, Mass., March 21 - Sonus Networks, Inc. (NASDAQ:SONS), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced today that the Company will be exhibiting at CTIA WIRELESS 2007® in Orlando, Florida, March 27-29, 2007. The Company will be showcasing a suite of next generation voice and multimedia applications built on Sonus' industry-leading IP Multimedia Subsystem (IMS)-ready architecture, designed to enable network operators to create new revenue streams and empower users with new methods of communications. Sonus is the market share leader in wireless IP-based voice networks according to iLocus Research.

"Wireless network operators are aggressively pursuing new ways to create revenue streams and improve the consumer experience," said Hassan Ahmed, chairman and CEO, Sonus Networks. "Fixed-Mobile Convergence (FMC) is a great example of the type of application that network operators see as a way to add value to their customers' communication experience, while at the same time improving their own operating efficiencies. We're excited to show the industry how Sonus is working to make this application, and other services that embrace the principles of personalization, presence and service mobility, a reality at this year's CTIA Conference."

Sonus will demonstrate a number of wireless applications in its exhibit, located at Booth 4151. Supported by the Sonus IMS-ready architecture and built with Sonus' IMS application development tools, including the Sonus IMX(TM) Multimedia Application Platform, these new wireless applications will illustrate how a Sonus-based network can help network operators globally deliver the types of applications and services that address the lifestyle demands of today's mobile users.

CTIA WIRELESS is the world's largest technology event dedicated exclusively to wireless, broadband convergence and mobile computing technologies, covering the entire industry from network infrastructure to microprocessors to applications to content to end-user hardware. The CTIA WIRELESS 2007 convention is the world's largest convergence marketplace with tens of thousands of attendees, over 400,000 square feet of exhibits, 20% international participation from over 100 countries, and represents a $500 billion global industry with 2.3 billion subscribers worldwide.

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 Westford, Massachusetts. Additional information on Sonus is available at www.sonusnet.com/.

For more information, please contact:

Sonus Media Relations:

Sarah McAuley

978-614-8745

smcauley@sonusnet.com

Source: Sonus Networks, Inc.

Web Site: www.sonusnet.com/

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