WESTFORD, Mass., October 8, 1999 - Sonus Networks, an emerging leader in carrier-class packet telephony solutions, today announced that it will be participating at the world's leading telecommunications event, Telecom '99 + Interactive '99, with Global Crossing Ltd. (Nasdaq: GLBX). At the Telecom '99 exhibition, which will be held October 10-17, Global Crossing will showcase Voice over IP (VoIP) solutions including the Sonus GSX9000^TMOpen Services Switch and Lucent Technologies' Softswitch. These systems form the foundation of Global Crossing's next-generation VoIP network, which is currently being rolled out in the United States. 

Telecom '99 + Interactive '99 will host more than 1,000 exhibitors and 200,000 attendees, and is being held at the PALEXPO in Geneva, Switzerland. The Global Crossing exhibit is located in the U.S. Pavilion in Hall 1, at Booth 1130.01C. 

"Telecom '99 is the premier international telecommunications event and Sonus is absolutely thrilled to join Global Crossing in their exhibition," said Gary Rogers, vice president of sales and marketing for Sonus Networks. "This venue affords a unique opportunity to highlight the partnerships and leading-edge technologies that are making Global Crossing's "One Planet, One Network" vision a reality." 

"Global Crossing's mission is to create the world's most advanced global IP-based network, which will link major businesses and population centers," commented Allan VanBuhler, vice president of new product development, Global Crossing. "The development of our new VoIP network is central to that goal, and we're excited to be working with Sonus at Telecom '99 to demonstrate these next-generation capabilities." 

In July 1999, Frontier Communications, which recently completed its merger with Global Crossing, selected Sonus' GSX9000 as the exclusive trunking gateway for the carrier's next-generation VoIP network. This new IP-based network is expected to carry 100% of Global Crossing's U.S. voice traffic by year-end 2002 and also provides Global Crossing with a software services creation platform, whereby new products will be developed in the network and deployed quickly and economically. New services enabled by the network include the world's first truly unified messaging platform and IP virtual private networks (VPNs). Additionally, Global Crossing's VoIP network will support the company's existing services including paging, 800 services, credit card calls, Internet server, local telephone service and more. 

Global Crossing has currently deployed its VoIP network in a three-city production trial in the United States. The company expects to deploy Sonus' GSX9000 and Lucent's Softswitch in 20 cities by August 2000, allowing Global Crossing to serve the entire U.S. market. 

About Global Crossing

Global Crossing is the world's first truly global telecommunications company. The Global Crossing Network and its product offerings will be available on five continents and address 80% of the world's international communications traffic. Global Crossing also possesses the largest fleet of cable laying and maintenance vessels in the world and currently services more than a third of the world's undersea cable kilometres. Global Crossing has been chosen to be listed among the world's leading public corporations on both the S&P 500 and the Nasdaq 100. Global Crossing's operations are headquartered in Hamilton, Bermuda, with executive offices in Los Angeles, California and Morristown, New Jersey. For more information, visit www.globalcrossing.com on the World Wide Web. 

About Sonus Networks

Sonus Networks, Inc. is delivering a new class of carrier solutions that enable the movement of telephony to converged packet networks and the development of a new generation of innovative voice and data services. The award-winning Sonus Packet Telephony suite and Open Services Architecture^TM (OSA) cut the time-to-market for competitive new service products from years to weeks, allowing carriers and third-party developers to sustain and 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, founded in 1997, is headquartered in Westford, Massachusetts and is privately held. Additional information is available at: http://www.sonusnet.com

GSX9000 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.