Sonus Networks Announces a Worldwide Reseller Agreement with Iperia

Partnership Will Increase Market Penetration in Carrier and Enterprise Networks by Providing Applications for Unified Communications

Westford, Mass., October 5, 2010 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in next-generation IP-based network solutions, and Iperia, a leading provider of mobile applications and content delivery, today announced an agreement aimed at meeting the growing demand for next-generation messaging applications. Partnering with Iperia will add value to Sonus products through the IperiaVX platform and the company's rich suite of unified messaging applications.

Under the terms of the agreement, Sonus will act as a reseller of Iperia's complete product portfolio, which includes the IperiaVX and all of its applications, both wireline and wireless. Sonus will also provide systems integration as well as support services globally.

"The combination of Sonus' market-leading VoIP and session management portfolio and Iperia's best-in-class unified messaging solutions enables us to deliver more robust solutions to our customers," said David Tipping, vice president of worldwide systems engineering and marketing for Sonus Networks. "This is a great addition to our existing portfolio, given our in-depth knowledge of and expertise in delivering and supporting unified communication solutions. This alliance creates a win-win situation for both companies, and we look forward to sharing the market expansion with Iperia."

The partnership will enable Sonus to deliver a rich suite of unified messaging applications with its ASX Telephony Application Server. With IperiaVX, Sonus customers will be able to deliver any messaging content to any end user device. This will enable Sonus customers to proactively plan or react to market demand and not be hindered by rigid and proprietary systems. The advanced capabilities of Sonus ASX and IperiaVX will bring enhanced services to end users, including voice messaging, mobile messaging, auto attendant, fax, and conferencing services.

"I am very excited about the ability to work with Sonus and bring unified messaging solutions to the marketplace," stated Sam Waicberg, CEO of Iperia. "This partnership will clearly provide the best of both worlds, delivering unmatched capabilities to our new customers."

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.

About Iperia

Iperia is a leading provider of mobile applications and content delivery for service providers and enterprises. The company's flagship product, IperiaVX, is a next-generation service delivery platform that powers value added applications consisting of mobile, voice, video, conferencing, and web messaging suites delivered either on-premise or as a cloud-based solution. Established in 1997, Iperia's products are deployed globally and have a worldwide network of distribution partners. For more information about Iperia, please visit www.Iperia.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' 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.

MEDIA RELATIONS CONTACT:

Sonus Networks
Aline Kaplan
alkaplan@sonusnet.com
+1 978-614-8167

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

Iperia:
Marie Browning
mbrowning@iperia.com
+1 781-839-3950