Sonus Provides Leading VoIP Provider Secure, Reliable VoIP Interconnect and Termination Services to 20 Countries across Africa, Increasing Capacity by 40%

For Immediate Release: March 7, 2013

Key Takeaways:

• EVOX selects the Sonus SBC 5200 to enable reliable, secure VoIP services to serve its customers across more than 20 countries in Africa, while increasing its service capacity by 40%
• Sonus was chosen based on the products capability to provide greater scalability, flexibility and reliability versus the competitive system which it replaced
• With a Sonus platform, EVOX can provide interconnect, transcoding and advanced routing services to their carrier partners, as well as cost-optimized services for Tier 1 carrier and pre-paid calling card providers

WESTFORD, Mass., -- Sonus Networks, Inc. (Nasdaq: SONS), a global leader in SIP communications, today announced that EVOX Trading, a leading telecommunications provider delivering services across Africa, has selected the Sonus SBC 5200 to secure its network border, deliver voice termination services and provide interconnect capabilities to its carrier partners. With the deployment of the SBC 5200, EVOX will immediately increase its service capacity by 40 percent, enabling them to deliver communication access in some of Africa’s fastest growing markets.

The uptake of VoIP, which has been deregulating across many African countries since mid-2000, is often linked to growing economies with the delivery of advanced voice services and more cost effective access to rural and under-served areas. EVOX found that countries across Africa were aggressively seeking more reliable, scalable and higher performing VoIP and SIP services. As a result, EVOX sought a new platform to help them meet this growing requirement. EVOX chose the SBC 5200 because the solution addressed the next-generation needs of VoIP and SIP communications with security, media switching and transcoding services in a single scalable device. This infrastructure will also provide an intelligent SIP interconnection capability between EVOX and their carrier partner networks. The SBC 5200 supports up to 64,000 sessions on a single server and provides advanced routing and integrated transcoding capability.

The Sonus SBC portfolio is the fastest growing on the market and is positioned in the Leaders quadrant of the “Magic Quadrant for Session Border Controllers,” published October 9, 2012 by Gartner, Inc.

Quotes:

“We have seen growing demand for next generation VoIP and SIP services in Africa and we chose Sonus to provide us with the secure, reliable, scalable solution that doing business across the continent demands,” said Romain BOULET, sales director, EVOX. “The performance and flexibility of the Sonus solution means we can provide new services and greater capacity to customers and partners in the region and help accelerate Africa as an emerging market.”

“Africa is a rapidly growing market, leap-frogging ‘legacy’ technologies to take advantage of the cost savings and enhanced services that can be enabled with VoIP and SIP,” said Serge Adam, vice president of EMEA at Sonus. “The Sonus SBC portfolio is the fastest growing on the market and serves as a foundation of advanced technology growth as EVOX ignites the burgeoning African market.”

Other Facts:

• The SBC 5200 has been performance verified by Miercom. As part of the testing, the SBC 5200 successfully registered 256,000 user authenticated IADs in 16 minutes at a rate of 550 registrations per second during a simulated metro area outage and recovery scenario To access the Miercom report visit www.sonus.net/miercom
• The Sonus SBC 5100 and SBC 5200 are qualified with Microsoft Lync Server 2010
• The SBC 5200 received the “2012 NGN Leadership Award,” presented by the TMC publications INTERNET TELEPHONY and Next Gen Mobility
• EVOX, headquartered in Paris, is a leading service provider in the wholesale carrier market delivering voice services in over 20 countries in Africa
• Additional Resources:

• Download a complimentary copy of Session Border Controllers For Dummies, Sonus Special Edition, by John Wiley & Sons, Inc., the publisher of the For Dummies® book series by visiting http://www.sonus.net/dummies • Sonus SBC 5200 Session Border Controller: Product information and resources

Tags/Keywords:

Sonus, SONS, EVOX, France, Africa, SBC, SBC 5200, session border controller, SIP, SIP trunking, IP, mobile voice, MVNO, IT cost savings, secure VoIP, network border, SIP-based solutions, VoIP, interconnect, quality of service, firewall

About Sonus:

Sonus helps the world's leading communications service providers and enterprises embrace the next generation of SIP-based solutions including VoIP, video and Unified Communications through secure, reliable and scalable IP networks. With customers around the globe and 15 years of experience transforming networks to IP, Sonus has enabled service providers and enterprises to capture and retain users and generate significant ROI. Sonus products include session border controllers, policy/routing servers, subscriber feature servers and media and signaling gateways. 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 www.sonus.net or call 1-855-GO-SONUS.

About EVOX:

EVOX started its operation in 2008 as a niche carrier focused on African market and today has an annual turnover of more than 31 million Euros, delivering over 200 million minutes in the carrier wholesale market. With its head office in Paris and POPs in Paris Telehouse 2 and Globalswitch, EVOX is delivering voice services into over 20 countries in Africa including Algeria, Morocco, DRC, Comoros, Equatorial Guinea and Mauritius.

Important Information Regarding Forward-Looking Statements:

The information in this release may contain certain forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995 regarding future events that involve risks and uncertainties. Although Sonus believes that its expectations are based on reasonable assumptions, readers are cautioned that these forward-looking statements are only predictions and are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. All statements other than statements of historical facts contained in this report are forward-looking statements. Our actual results may differ materially from those contemplated by the forward-looking statements. For further information regarding risks and uncertainties associated with Sonus’ business, please refer to the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Risk Factors” sections of Sonus’ filings with the Securities and Exchange Commission. Any forward-looking statements represent Sonus' views only as of the date on which such statement is made, 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.

For More Information:

For Sonus:

Alison Steel +44 782-550-8333 asteel@sonusnet.com

For EVOX Trading:

Romain BOULET +33662507812 romain@evox.fr