360networks Leverages Sonus NBS-9000 Network Border Switch For Advanced IP Peering And Session Border Control

Facilities-Based Wholesale Telecommunication Provider Adds Capacity, Augments Its IP Network with Sonus' Unique Hybrid Trunking Capabilities

WESTFORD, Mass., August 31, 2010 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in next-generation IP-based network solutions, today announced that 360networks, a full-service provider of Private Line Transport, VoIP, IP Transit, and Local Access services, has added capacity and advanced IP peering capability to its network using the Sonus NBS-9000 Network Border Switch. The Sonus NBS-9000 Network Border Switch supports a hybrid configuration, which serves both TDM-to-IP and IP-to-IP traffic through a common platform.

360networks owns and operates an 18,000 route-mile fiber optic backbone, one of the most advanced networks in the country, providing deep and dense coverage from the Mississippi River to the Pacific. By leveraging this backbone, 360networks' service provider customers can quickly pursue next-generation strategies, migrate from legacy networks, expand their geographic footprint and services, and increase network diversity.

"We are witnessing consistent growth and market demand for VoIP as well as other IP services," commented Brady Adams, chief technical officer at 360networks. "We needed to be able to scale to meet this growth cost effectively with an integrated solution for both TDM and VoIP services. The Sonus GSX9000 media gateway has proven reliable for 360networks and we look forward to adding the NBS functionality as a catalyst for our continued expansion of services."

"360networks is a great example of a network where the hybrid approach, unique to Sonus, demonstrates a positive return on investment," commented Guru Pai, chief operating officer at Sonus networks. "By combining TDM-to-IP and IP-to-IP traffic on the same platform, 360networks can migrate their networks to IP, while keeping pace with demands faced by its wholesale customers. We are pleased that 360networks has trusted us with their business."

360networks will deploy the Sonus NBS-9000 Network Border Switch that is based on the GSX9000^™ platform and the PSX^™ Call Routing Server in a centralized configuration, along with the Sonus Insight Element Management System for centralized network management and reporting.

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 360networks

360networks is a full service wholesale provider of Private Line Transport, VoIP, IP, and Local Access (T1/DS3) services, on its wholly-owned fiber optic backbone. Its facilities-based network provides deep coverage, spanning over 17,200 miles to tier 1 to 4 western U.S. markets (Arizona, California, Colorado, Idaho, Illinois, Iowa, Minnesota, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Texas, Utah, Washington, and Wyoming). Financially stable and a CLEC in 36 states, 360networks enables the nation's voice, data and web-based application and service providers to quickly pursue next generation strategies, migrate from legacy networks, grow into new markets and services, and increase network diversity. 360networks.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.

For more information, please contact:

Sonus: Aashu Virmani
avirmani@sonusnet.com
+1 978-614-8795

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

360networks:
Scott R Fincher
scott.fincher@360networks.com
+1 303-854-5016