All International Voice Traffic Now Supported By An All-IP Sonus Core, Reducing Network Operating Costs

WESTFORD, Mass., July 14, 2009 – Sonus Networks Inc. (Nasdaq: SONS), providing network transformation through IP communications, today announced that The Bahamas Telecommunications Company Limited (BTC) has successfully completed the first phase of its IP network migration, using Sonus technology and professional services to bring a next-generation communications infrastructure to The Bahamas. This first phase of the full CLASS Four and CLASS Five migration project underway with Sonus routes all of BTC’s international traffic through an efficient and cost effective Sonus IP core.

During this first stage of network transformation, Sonus has successfully installed an IMS-ready, next-generation network core, which enables BTC to deploy IP peering and IP session management. BTC is using the Sonus Network Border Switch (NBS) for session security, Sonus GSX9000™ for media gateway services and the Sonus PSX™ for routing and policy services for both IP and legacy TDM traffic. Sonus’ hybrid approach offers session border security and media gateway services in the same chassis providing BTC with a cost effective method of migrating traffic from TDM to IP using the same infrastructures. The migration has allowed for all international traffic to be directed and managed across the new IP core. This reduces the cost and complexity of the deployment and network operating overheads.

A geo-redundant site location has been established in Miami, Florida to address the provisioning and switching for the entire network in the event of an emergency. The Miami site will also terminate traffic to United States-based carriers, which allows better access to cost competitive North American wholesalers.

"With this first phase of migration complete, we are now providing the Bahamian people with leading edge communications technology,” said I. Kirk Griffin, Acting President & CEO at BTC. “As always, it is our goal to provide the people and businesses on our islands with first-class communication capabilities. The project management and support from the professional services team at Sonus has been critical to us achieving our deployment goals, while training our engineers to support and manage the new technology."

The following phases of BTC’s deployment will include migration of legacy CLASS 5 switches to Sonus’ next generation access platform, the Sonus ASX™ Feature Server. Residential and business subscribers will maintain the legacy services they have come to expect while BTC offers them a new suite of IP based services. The complete deployment, core-to-edge, will enable BTC to offer a robust set of services that weren’t practical using legacy technology.

"BTC has made a significant investment in the future of their communications infrastructure, demonstrating their commitment to make the Bahamian Islands a hub of excellence,” commented Guru Pai, senior vice president and general manager at Sonus Networks. “We are extremely pleased with the strength of our partnership on this project and look forward to completing the final phases of this migration to an IP-based infrastructure. This will give The Bahamas some of the most advanced network capabilities available today."

The fully integrated IP-based platform from Sonus Networks has significantly reduced the amount of equipment needed to manage increasing voice traffic across BTC’s network, when compared to their legacy systems. BTC estimates show that, by choosing Sonus technology, it will significantly reduce energy costs, maintenance costs and support costs.

About Sonus Networks

Sonus Networks Inc., providing network transformation through IP communications technology, is leading the evolution of communications networks to support the multi-device demands of today’s digital lifestyle. Sonus solutions and services enable fixed, mobile and cable operators to gain session awareness and deliver multi-media capabilities essential to adding value and expanding their customer and subscriber base. Through standards based interoperable solutions and services, Sonus extends the investments made in traditional networks by enabling operators to seamlessly migrate to next generation technology and deliver the secure, reliable, scalable and cost-effective network needed to grow their business. For more information visit 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. For a discussion of the risks and uncertainties which could cause actual results to differ from those contained in the forward-looking statements, see “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2008 and Quarterly Report on Form 10-Q for the quarter ended March 31, 2009. Risk factors include among others: the unpredictability of our quarterly financial results; risks and uncertainties associated with the Company's previous 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 the impact the current global financial market conditions may have on the telecommunications industry. 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:

Media Relations For Sonus Networks:
Lucy Millington
1-978-614-8240
lmillington@sonusnet.com

Racepoint Group For Sonus Networks:
Shannon Breen/Katie Traut
(+1) 781-487-4600
sonus@racepointgroup.com

Media Relations For BTC:
Indira Collie
(242) 302-7573
icollie@btcbahamas.com