FLORHAM PARK, New Jersey, February 3 /PRNewswire/ --

- SIP Trunking Solutions Enhance Unified Communications, Increase Productivity

Global Crossing (Nasdaq: GLBC), a leading global IP solutions provider, today announced it is providing users of Microsoft Office Communications Server 2007 Release 2 (R2), access to Global Crossing's suite of Session Initiated Protocol (SIP) Trunking solutions. This positions Global Crossing as one of the first SIP Trunking service providers qualified for use with Office Communications Server 2007.

By extending Global Crossing's SIP Trunking offering to Microsoft's unified communications systems, we are helping expedite the adoption of VoIP services for global enterprise customers, said Dave Carey, chief marketing officer with Global Crossing. Our Global IP solutions help exceed our clients' need for cost-effective and efficient communications tools for the 21st century.

SIP Trunking is the de facto interconnection standard for VoIP calling applications, serving as an alternative to circuit-based fixed lines on the public switched telephone network (PSTN). SIP Trunking can offer enterprise customers significant cost-savings from the elimination of gateways, costly ISDN facilities, and the maximization of bandwidth utilization in a converged IP environment.

The combination of Office Communications Server 2007 Release 2 and Global Crossing's suite of SIP Trunking solutions provide a powerful new way for people to collaborate and offers customers a rich and integrated communications experience, said Eric Swift, senior director of the Microsoft Unified Communications Group at Microsoft Corp. Global Crossing is adding significant value to enterprise communications and enabling businesses to better connect people, information and business processes.

Lionbridge, a leading provider of multilingual language, content, and technology outsourcing services, recently upgraded to Office Communications Server 2007 Release 2. Lionbridge is expecting to migrate voice communications from a traditional PBX to an Office Communications Server solution on an ongoing basis.

Global Crossing has been a valuable partner, said Henk Thomassen, IT Systems Engineer, Lionbridge. They have shown the improvement in flexibility that we can have in terms of call routing and redundancy. In addition, the SIP Trunking they provide enables us to define a good call routing plan that ensures us the best audio quality at the least cost.

Enterprises such as Lionbridge receive access to Global Crossing's state-of-the-art VoIP Interoperability Labs for equipment, call flow, protocol and IP signaling compatibility. With more than 700 successful tests of telephony hardware and software, Global Crossing brings years of proven VoIP service experience to enterprises that have deployed or are contemplating deployment of Office Communications Server 2007 R2 as its unified communications platform.

Global Crossing's suite of VoIP services supporting Microsoft's Office Communications Server 2007 R2 include:

- Global Crossing VoIP Outbound(TM) (which processes traditional long distance and international long distance);

- Global Crossing VoIP Toll-Free(TM);

- Global Crossing VoIP Local Service(TM); and

- Global Crossing VoIP Consulting(TM) (an offering that is a combination of advanced interoperability testing and customized VoIP engineering consulting services).

Global Crossing defines Unified Communications as the integration of collaboration and IP telephony services, delivered via a converged audio, data and video IP network. Through this fully-meshed MPLS-based global network, Global Crossing delivers customers the ability to deploy enhanced communications tools that enable the effective exchange of information while raising user productivity levels.

ABOUT GLOBAL CROSSING

Global Crossing (Nasdaq: GLBC) is a leading global IP solutions provider with the world's first integrated global IP-based network. The company offers a full range of secure data, voice, and video products to approximately 40 percent of the Fortune 500, as well as to 700 carriers, mobile operators and ISPs. It delivers services to more than 690 cities in more than 60 countries and six continents around the globe.

Please visit www.globalcrossing.com or blogs.globalcrossing.com/ for more information about Global Crossing.

Statements in this press release about expected future events and financial results are forward-looking and subject to risks and uncertainties that could cause the actual results to differ materially, including risks referenced from time to time in the company's filings with the Securities and Exchange Commission. Global Crossing undertakes no duty to update information contained in this press release or in other public disclosures at any time.

All product and company names herein may be trademarks of their respective owners.

CONTACT GLOBAL CROSSING: Press Contacts Tom Topalian +1-973-937-0154 thomas.topalian@globalcrossing.com Paula Vivo Latin America +55-11-3957-2424 Paula.Vivo@globalcrossing.com Chantal Reed Europe +44-(0)-207-904-3204 Chantal.Reed@globalcrossing.com Analysts/Investors Contact Suzanne Lipton +1-800-836-0342 glbc@globalcrossing.com

GEN/PR1

Tom Topalian, +1-973-937-0154, thomas.topalian@globalcrossing.com or Paula Vivo, Latin America, +55-11-3957-2424, Paula.Vivo@globalcrossing.com or Chantal Reed, Europe, +44-(0)-207-904-3204, Chantal.Reed@globalcrossing.com or for Analysts/Investors, Suzanne Lipton, +1-800-836-0342, glbc@globalcrossing.com