Global Crossing Achieves Major Voice Over Internet Protocol (VoIP) Milestone with Sonus Networks

Global Crossing Carries One Billion Minutes Per Month On Sonus-supported VoIP Network
Year-to-Date Traffic on VoIP Infrastructure More Than Seven Billion Minutes

Global Crossing and Sonus Networks (Nasdaq: SONS - News) today announced that Global Crossing has reached a significant milestone in the operation of its next- generation voice over Internet Protocol (VoIP) network, which is supported by Sonus Networks' voice infrastructure solutions. In the month of November alone, the Global Crossing VoIP network carried more than one billion minutes of voice traffic for carrier and enterprise customers. As a reference point, the Global Crossing VoIP network carried 2.3 billion minutes of traffic during the entire third quarter.

"We built our global, IP-based network to meet the growing communications needs of enterprise and carrier customers around the world with elegant, converged solutions," said Carl Grivner, Global Crossing's COO. "Customers are embracing the quality and reliability of calls over our VoIP platform, enabling us to reach this important milestone. Sonus' architecture has been an integral part of this success, and they continue to be a valued partner. We look forward to hitting new targets very soon."

Global Crossing went into production on its carrier-class VoIP network in September 2000, with seven VoIP gateway centers in North America. Today, the Global Crossing VoIP network comprises 26 VoIP gateway centers in 12 countries throughout Europe, Asia, and Latin America, providing connectivity to enterprise and carrier customers worldwide. At the heart of the Global Crossing network is Sonus' Open Services Architecture(TM) (OSA) and packet voice infrastructure solutions, including the GSX9000(TM) Open Services Switch, the Insignus(TM) Softswitch and the Sonus Insight(TM) Management System. The Sonus-based VoIP infrastructure provides Global Crossing's customers with the same quality and reliability as a traditional circuit- switched network, and enables the quick delivery of enhanced IP services to meet evolving communications requirements across industries. By managing its own VoIP platform, Global Crossing ensures corporate-quality service that is unaffected by public Internet delays, providing customers the benefits of reliability and lack of congestion cost-effectively.

"Global Crossing is recognized as a pioneer in the deployment of VoIP technologies, having been one of the first carriers to introduce an IP-based voice infrastructure," said Hassan Ahmed, president and CEO, Sonus Networks. "Since going live two years ago, Global Crossing has expanded the reach of its network and has driven increasing minutes of traffic over the network to attain the significant milestone we are marking today. We are extremely proud of the work we've done together to build this world-class VoIP infrastructure and look forward to helping Global Crossing continue the success of its network."

The Global Crossing suite of voice products provide carrier and enterprise customers access to switched and dedicated origination and termination, both nationally and internationally, as well as long-distance and toll-free services with enhanced routing capabilities over Global Crossing's worldwide fiber optic network using either VoIP packet-based or conventional Time Division Multiplexing (TDM) technology. Both platforms are fully interoperable.

ABOUT GLOBAL CROSSING

Global Crossing provides telecommunications solutions over the world's first integrated global IP-based network, which reaches 27 countries and more than 200 major cities around the globe. Global Crossing serves many of the world's largest corporations, providing a full range of managed data and voice products and services. Global Crossing operates throughout the Americas and Europe, and provides services in Asia through its subsidiary, Asia Global Crossing.

On January 28, 2002, Global Crossing Ltd. and certain of its subsidiaries (excluding Asia Global Crossing and its subsidiaries) commenced Chapter 11 cases in the United States Bankruptcy Court for the Southern District of New York (Bankruptcy Court) and coordinated proceedings in the Supreme Court of Bermuda (Bermuda Court). On the same date, the Bermuda Court granted an order appointing joint provisional liquidators with the power to oversee the continuation and reorganization of the Bermuda-incorporated companies' businesses under the control of their boards of directors and under the supervision of the Bankruptcy Court and the Bermuda Court. Additional Global Crossing subsidiaries commenced Chapter 11 cases on April 23, August 4 and August 30, 2002, with the Bermuda incorporated subsidiaries filing coordinated insolvency proceedings in the Bermuda Court. The administration of all the cases filed subsequent to Global Crossing's initial filing on January 28, 2002 has been consolidated with that of the cases commenced on January 28, 2002. Global Crossing's Plan of Reorganization, which it filed with the Bankruptcy Court on September 16, 2002, does not include a capital structure in which existing common or preferred equity would retain any value.

On November 18, 2002, Asia Global Crossing Ltd. and its subsidiary, Asia Global Crossing Development Company, commenced Chapter 11 cases in the United States Bankruptcy Court for the Southern District of New York and coordinated proceedings in the Supreme Court of Bermuda. Asia Global Crossing Ltd. is a majority-owned subsidiary of Global Crossing. However, Asia Global Crossing's bankruptcy proceedings are being administered separately and are not being consolidated with Global Crossing's proceedings. Asia Global Crossing has announced that no recovery is expected for Asia Global Crossing's shareholders.

Please visit www.globalcrossing.com or www.asiaglobalcrossing.com for more information about Global Crossing and Asia Global Crossing.

ABOUT SONUS NETWORKS

Sonus Networks, Inc., is a leading provider of packet voice infrastructure products for the new public network. With its Open Services Architecture(TM) (OSA), Sonus delivers end-to-end solutions addressing a full range of carrier applications, including trunking, residential access and Centrex, tandem switching, and IP voice termination, as well as enhanced services. Sonus' award-winning voice infrastructure solutions, including media gateways, softswitches and network management systems, are deployed in service provider networks worldwide. Sonus, founded in 1997, is headquartered in Westford, Massachusetts. Additional information on Sonus is available at www.sonusnet.com .

Statements made in this press release that state Global Crossing's or management's intentions, beliefs, expectations, or predictions for the future are forward-looking statements. Such forward-looking statements are subject to a number of risks, assumptions and uncertainties that could cause Global Crossing's actual results to differ materially from those projected in such forward-looking statements. These risks, assumptions and uncertainties include: the impact of Global Crossing's bankruptcy proceedings on sales, customer and employee retention, supplier relationships and operations; the ability to complete systems within currently estimated time frames and budgets; the ability to compete effectively in a rapidly evolving and price competitive marketplace; possible reductions in demand for our products and services due to competition changes in industry conditions; changes in the nature of telecommunications regulation in the United States and other countries; changes in business strategy; the successful integration of acquired businesses; the impact of technological change; and other risks referenced from time to time in Global Crossing's filings with the Securities and Exchange Commission.

This release may contain projections or other forward-looking statements regarding future events or the future financial performance of Sonus 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 Sonus' Quarterly Report on Form 10-Q, dated November 13, 2002 and filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. These risk factors include, among others, the adverse effect of recent developments in the telecommunications industry, the weakened financial position of many service providers, Sonus' ability to grow its customer base, dependence on new product offerings, market acceptance of its products, rapid technological and market change and manufacturing and sourcing risks.

Open Services Architecture, GSX9000, Insignus and Sonus Insight are trademarks of Sonus Networks. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.

CONTACT GLOBAL CROSSING:

Press Contact
Catherine Berthier
+ 1 212-412-4666
Catherine.Berthier@globalcrossing.com

Analysts/Investors Contact
Ken Simril
+ 1 310-385-3838
investors@globalcrossing.com

CONTACT SONUS NETWORKS:

Press Contact
Beth Morrissey
+1 978-589-8579
bmorrissey@sonusnet.com

Analysts/Investors Contact
Jocelyn Lynds
+1 978-589-8672
jlynds@sonusnet.com