IntelePeer Upgrades Next-Generation Voice Network with Sonus Networks

Next-Generation Carrier Replaces Existing Telephony Architecture with Sonus IMS-Based Architecture; Deploying Sonus NBS for IP Peering Grid Service

WESTFORD, Mass., October 01, 2007 – Sonus Networks, Inc. (Nasdaq: SONS), a leading supplier of service provider IP-voice infrastructure solutions, and IntelePeer™, Inc., a leading global IP communications innovator, formerly known as VoEX, Inc., announced today that IntelePeer has selected Sonus' IP Multimedia Subsystem (IMS)-based architecture as the foundation for its next-generation voice network. The IntelePeer network is used to deliver IP-based voice services and applications to large communications services providers, including wireless and wireline carriers, voice service providers, universities and other major enterprises. IntelePeer selected the Sonus solution to replace its existing IP-based infrastructure because of the architecture's ability to scale and seamlessly support new services. Additionally, IntelePeer is deploying Sonus' Network Border Switch to support its IP peering service.

"By selecting Sonus' IMS-ready architecture and enlisting the support of its professional services organization, we're able to deploy a carrier-class long distance network that supports the delivery of converged services," said Brent Bourne, Chief Operating Officer of IntelePeer. "The Sonus platform enables us to deliver superior quality of service and to interconnect securely and efficiently with other IP-voice providers. This is essential as more and more carriers migrate towards an all-IP infrastructure."

"As innovative carriers like IntelePeer witness increased demand for their services, they require a foundation that can grow to meet higher traffic levels without sacrificing quality of service and reliability. Carrier-grade applications carrying high traffic volumes during peak hours are where Sonus solutions really thrive and differentiate themselves from others in the industry," said Hassan Ahmed, chairman, president and CEO, Sonus Networks. "In addition to seamless scalability, IntelePeer has embraced Sonus' IMS-ready solutions to deliver operating leverage, carrier-class performance and reliability, and the ability to rapidly integrate new IP-based voice services for its users."

IntelePeer is deploying a full suite of Sonus' IMS-ready solutions, including the GSX9000 Open Services Switch, the PSX Call Routing Server, the SGX Signaling Gateway, the Sonus Insight Management System, as well as the Network Border Switch (NBS). The new network will leverage the NBS for advanced IP-to-IP peering, session control and security. IntelePeer's initially deployed the Sonus-based architecture in New York, Chicago, and London earlier this year, with ongoing expansion into additional cities. IntelePeer has enlisted the help of Sonus' professional services team to support the turnkey integration process.

The IntelePeer network began carrying live traffic on the Sonus platform in August. It is now routing all traffic using the Sonus platform in conjunction with its SuperRegistry and Peering Grid services.

About IntelePeer

IntelePeer Inc. (www.IntelePeer.com) provides all the infrastructure and services needed to connect carriers, cable companies, wireless and other voice service providers, and eCommunities – enabling them to dramatically reduce their communications costs, connect disparate networks and build state-of-the-art intelligent communications applications regardless of geographic or technology boundaries.

IntelePeer serves as a single source for dynamic protocol translation, transcoding, call routing, device discovery, intelligent least-cost routing, SIP session management and next-generation application development. For IP-enabled service providers, IntelePeer delivers the largest number of IP and TDM registry endpoints in the world to enable the lowest possible cost, advanced end-to-end application delivery, and cross connections to TDM providers for complete reach of their service offerings.

For service providers migrating to VoIP, IntelePeer offers step-by-step managed service programs to enable immediate cost reduction and a clear migration path to a native VoIP infrastructure and advanced application functionality. For all service providers, IntelePeer offers proven, unprecedented quality of service through its intelligent routing, multiple protocol support, and adherence to industry standards.

Privately held, IntelePeer is headquartered in Foster City, California, with global operations throughout North America, Europe and Asia.

About Sonus Networks

Sonus Networks, Inc. is a leading provider of IP-voice infrastructure solutions for wireline and wireless service providers. With its comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the full range of carrier applications, including residential and business voice services, wireless voice and multimedia, trunking and tandem switching, carrier interconnection and enhanced services. Sonus' voice infrastructure solutions are deployed in service provider networks worldwide. Founded in 1997, Sonus is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://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. Readers are referred to Item 1A "Risk Factors" of Sonus' Quarterly Report on Form 10-Q for the period ended June 30, 2007, filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Risk factors include among others: the impact of material weaknesses in our disclosure controls and procedures and our internal control over financial reporting on our ability to report our financial results timely and accurately; the unpredictability of our quarterly financial results; risks and uncertainties associated with the Company's restatement of its historical stock option granting practices and accounting including regulatory actions or litigation; risks associated with our international expansion and growth; consolidation in the telecommunications industry; and potential costs resulting from pending securities litigation against the Company. 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.

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.