Sonus Networks Enables Cable Customers To Make And Receive Calls On Their Smartphone Using Their Home Phone Number

Exciting Opportunity for Cable Operators to Add Value to Fixed Line Services Demonstrated at CableLabs Summer Conference 2010

KEYSTONE, Colo. (CableLabs Summer Conference 2010), August 16, 2010 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in next generation IP-based network solutions, today introduced a new solution for cable operators to add value to their existing home line services. Dubbed "Fixed – Smartphone Convergence," cable operators can use new capabilities in the Sonus Networks ASX Telephony Application Server to allow cable subscribers with home phone service to combine their existing phone line with up to five additional SIP-enabled devices including 3G/Wi-Fi enabled smartphones. Sonus is demonstrating this new solution at the CableLabs Summer Conference 2010 taking place August 15-18 at the Keystone Resort and Conference Center, Keystone, Colo.

"Cable operators are looking for ways to add more value for fixed line customers, and also get more involved in offering mobile services," said Greg Zweig, director of access product management at Sonus Networks. "With Fixed – Smartphone Convergence powered by the ASX Telephony Application Server, we are giving cable operators a way to make a subscriber's home number more valuable and more convenient to access, anywhere in the world. The solution gives MSOs a compelling new offering that leverages the explosion in smart mobile phones and tablet computers."

The Sonus Fixed – Smartphone Convergence solution makes it possible for subscribers to receive or place calls using both their home telephone line (using NCS or SIP call control) and nearly any SIP-enabled device connected to the Internet. The solution will ring all of the devices simultaneously and allows users to make and receive multiple calls concurrently as well as allow calls to be transferred to other users. It is an ideal solution for families with multiple smart devices and mobile lifestyles. The solution can support up to five mobile devices in addition to the home number.

Attendees at the CableLabs Summer Conference 2010 will be able to see Sonus' Fixed – Smartphone Convergence solution in action. Live calls coming into the booth's landline phone will ring simultaneously on different devices including a PC softphone and a SIP-enabled smartphone. Visitors will experience the ease of answering and transferring calls among the devices, even as other users make outbound calls on one or more devices.

About Sonus Networks

Sonus Networks, Inc. is a leader in IP networking with proven expertise in delivering secure, reliable and scalable next generation infrastructure and subscriber solutions. With customers in over 50 countries across the globe and over a decade of experience in transforming networks to IP, Sonus has enabled service providers and enterprises to capture and retain users and generate significant ROI. Sonus products include media and signaling gateways, policy/routing servers, session border controllers and subscriber feature servers. Sonus products are supported by a global services team with experience in design, deployment and maintenance of some of the world's largest and most complex IP networks. For more information visit sonus.net.

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' Annual Report on Form 10-K for the year ended December 31, 2009 and all subsequent Quarterly Reports on Form 10-Q, which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements. 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.

For more information, please contact:

Aashu Virmani
avirmani@sonusnet.com
+1 978-614-8795

Paul Roberts
sonus@daviesmurphy.com
+1 781-418-2418