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Leading Regional Player Builds Next-Generation Voice Network with Sonus Gear; Multi-Million Dollar Network Enables Multitude of Enhanced Services

WESTFORD, Mass., June 14, 2000 – Sonus Networks (Nasdaq: SONS), a leading provider of voice infrastructure products for the new public network, today announced that USA Datanet, a New York-based Communications Application Service Provider, has built its next-generation voice over IP (VoIP) network on Sonus’ carrier-class Packet Telephony suite of solutions. USA Datanet is currently delivering revenue-generating long distance and Internet services over the Sonus infrastructure, serving subscribers in cities throughout the northeastern United States. 

"Our Sonus switching platform has been up and running for more than a month now, and we couldn’t be more pleased with the results," said Frank Caruso, founder, president and chairman, USA Datanet. "The Sonus solution provides the reliability, scalability and quality traditionally found in the circuit world, but goes considerably further with the unlimited service options now available to us. We look forward to expanding this network with Sonus."

When founded in 1998, USA Datanet built its initial network with the anticipation of joining together the circuit switched world and the packet world. USA Datanet was seeking a next-generation, packet voice solution that would enable them to provide long distance and Internet service for a fraction of the cost of traditional service, as well as deliver innovative, enhanced service offerings. The carrier evaluated a number of competitive alternatives and selected the Sonus Packet Telephony suite, including the GSX9000 Open Services Switch, the PSX6000 SoftSwitch and the SGX2000 SS7 Signaling Gateway, as the platform for its next-generation VoIP network. 

"USA Datanet’s vision is to deliver services that combine the best of the voice and data environments," noted Hassan Ahmed, president and CEO, Sonus Networks. "With the advanced VoIP network that we have built together, USA Datanet has the ability to offer its users highly competitive long distance rates, as well as a host of new services not available in traditional voice networks. We look forward to continuing to build upon the successful partnership we’ve established."

USA Datanet has developed a network that deploys switches in seven cities throughout the northeastern United States. With the new network, USA Datanet continues to offer subscribers in its service area the "flat-capped" long distance service pioneered by the company. This innovative pricing model allows users to pay for telephone service on a per call basis rather than per minute. Additionally, USA Datanet is providing Internet access and a range of IP-enabled applications including a voice portal interface for all services, text-to-speech e-mail, find me/follow me service, contact list management, stock quotes and more. 

In the future, USA Datanet plans to further expand the geographic scope of the network and also to offer other enhanced services. Examples of these new services include voice-activated access to the web for airline reservations, reminder service, news/sports/traffic, movie schedules, restaurant guides, and others.

About USA Datanet

USA Datanet utilizes next-generation technology to deliver long distance, calling card, Internet access, and other telecommunications services to customers at a fraction of the price of traditional providers. Soon, the company will introduce its voice portal interface to an advanced suite of services. The company is best known for its unlimited-duration calls to anywhere in the Northeast United States for no more than 99 cents. Residential and business customers register with USA Datanet and use the long distance and calling card services on an elective basis with no monthly fees, no minimum charges and no switching phone companies. Based in Syracuse, New York, the company is currently accepting residential and business customers in New York State, Connecticut, Massachusetts, New Hampshire, and Rhode Island. The company will soon be able to accept customers throughout the Northeast United States. For more information, call 1-877-499-2368 or visit USA Datanet's website at www.usadatanet.com. 

About Sonus Networks

Sonus Networks, Inc. is a leading provider of voice infrastructure products for the new public network. Sonus’ solutions enable service providers to deploy an integrated network capable of carrying both voice and data traffic, and to deliver a range of innovative, new services. The Sonus Open Services ArchitectureTM (OSA) and award-winning Packet Telephony suite cut the time-to-market for competitive new service products, allowing carriers and third-party developers to expand marketshare and build important new revenue streams. Its highly scalable products fully interoperate with and extend the life and utility of today’s public network. Sonus embodies in its management and staff decades of experience in developing carrier-class voice, data and multimedia solutions for implementation in the world’s largest networks. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. 

This press release may contain forward-looking statements relating to future events or future financial performance that involve risks and uncertainties. These statements are made pursuant to the safe harbor provisions of Section 21E of the Securities Exchange Act of 1934. These statements are only predictions and actual results could differ materially from those anticipated in these statements based upon a number of factors including those risk factors identified in the Sonus Networks’ Prospectus dated May 24, 2000.

GSX9000, PSX6000, SGX2000 and Open Services Architecture are trademarks of Sonus Networks. All other company and product names may be trademarks of the respective companies with which they are associated.