Next-Generation Carrier Expands Secure IP Peering Capacity To Accommodate Growth and Offer New IP Services To Carrier and Enterprise Customers

WESTFORD, Mass., July 15, 2009 – Sonus Networks, Inc. (Nasdaq: SONS), providing network transformation through IP communications technology, today announced that IntelePeer, Inc., a leader in hosted on-demand rich media and IP communications, has expanded its Sonus based network to accommodate the growth of IP voice traffic. The expansion provides a significant increase in IP capacity across IntelePeer’s network nodes, doubling the number of sessions available for IP traffic. IntelePeer selected a Sonus based network to support its fully managed, hosted, on-demand voice peering infrastructure in 2006 and since then has seen IP traffic entering its network more than double.

IntelePeer's continued growth is in large part due to their ability to be flexible and respond to market needs for high quality, cost effective communication services. To support their growth, IntelePeer has chosen the Sonus Network Border Switch as a standalone session border control (SBC) solution, for secure IP-peering, session control and media management. This will allow IntelePeer to offer additional services including media transcoding that extend the reach of its robust and scalable Voice Peering Network to both newer IP and legacy TDM connectivity.

"Today, IP voice traffic entering our network represents about 60% of all traffic and we expect an upward trend in IP-based traffic to continue for the foreseeable future as additional networks join our peering grid infrastructure," said Phillip Bronsdon, senior vice president engineering and operations at IntelePeer. "The Sonus platform has proven to be robust, secure and scalable, and the support provided by the Sonus professional services teams has enabled us to quickly respond to changing market needs and grow our business to offer new voice and IP services to our carrier and enterprise customers."

"Like many service providers, IntelePeer needs to manage the changing mix of TDM and IP traffic seamlessly, efficiently and cost effectively within the same network," said Shailin Sehgal, vice president, product management and marketing at Sonus Networks. "The Sonus solution is flexible and can be integrated with the media gateway function or used independently. In today’s cost conscious environment we believe that this approach provides a more cost effective way to transform carrier networks to all IP."

The IntelePeer network began carrying live traffic on the Sonus platform in late 2006. It has deployed the full suite of Sonus solutions, including the GSX9000™ Media Gateway, the PSX™ Call Routing Server, the SGX™ Signaling Gateway, the Sonus Insight™ Management System and the Sonus Network Border Switch (NBS). It is now routing all traffic using the Sonus platform in conjunction with its SuperRegistry™ and Voice Peering Network services.

About Intelepeer

IntelePeer, www.IntelePeer.com, a leader in hosted on-demand rich media communications, enables carriers, businesses and software vendors to easily deliver voice and multimedia capabilities to any phone or network-connected device -- without incurring up-front capital costs. Through our innovative, communications-as-a-service (CaaS) platform, IntelePeer AppworX™, our SuperRegistry™ and our extensive Voice Peering Network, we provide our customers with the platform to offer high-quality interactive voice, video, SMS, data and other rich-media services while providing significant cost savings for their telecommunication expenditures. Through intuitive APIs, Web Services, and brandable widgets and applets, IntelePeer removes the complexity of telecom and opens network functions to mainstream developers who are creating voice-Web "mashups" and communications-enabled business processes embedded into enterprise, webcasting, social networking, entertainment and e-commerce applications. Business professionals who use customer relationship management (CRM) software and common desktop applications such as calendaring and contact management also rely on us for instant access to bridge-to-services, voice blast, video blast, text-to-speech, conferencing and other features that enable communications-enhanced business processes that drive efficiency and deliver cost savings. Based in San Mateo, Calif., we operate our own carrier-grade network carrying more than 7 billion minutes, with worldwide coverage delivered through an IP and TDM peering grid with over 50 leading service provider peering partners. IntelePeer is privately held and is backed by venture capital firms VantagePoint Venture Partners, Kennet Venture Partners, NorthCap Partners and EDF Ventures.

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.

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For more information, please contact:

Media Relations:
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