TSI and Belgacom Launch International Gateway Services and Two-Way Interstandard SMS.

Business Editors/High-Tech Writers

CANNES--(BUSINESS WIRE)--Feb. 23, 2004

TSI and Belgacom Launch Signaling Translation Services to Provide

Bi-Lateral Roaming and Messaging for GSM Carriers, Enabling

Worldwide, Interstandard Communications for Subscribers.

TSI Telecommunication Services Inc. (TSI) (www.tsiconnections.com) a global communications technology company, and Belgacom, a leading provider of total telecommunication solutions, today announced an agreement to launch bi-lateral signaling services and interstandard SMS for mobile carriers. Belgacom additionally will act as a signaling provider for TSI to provide inter-continental connectivity to GSM carriers.

The Belgacom-TSI agreement establishes interstandard SMS between the GSM world and North American ANSI-41 carriers using CDMA and TDMA protocols. TSI will provide the SS7-to-SMPP network protocol translation required for interstandard SMS. As the leading U.S. service provider for number portability services, TSI will also provide the necessary number portability database dips. These key features, combined with two-way messaging, bill-and-keep capability to bridge differences in business models, delivery receipt integrity, and advanced filtering capabilities, make Belgacom's SMS Transit a truly global service. By using Belgacom's SMS Transit and MMS Transit, mobile carriers can extend international messaging coverage to fuel growth and gain a competitive advantage in their own national markets.

In conjunction with the inter-standard SMS, Belgacom and TSI contracted to provide interstandard roaming connectivity. TSI's international signaling services, known as SCCP gateway services, provides translation and connectivity between Belgacom's customers and North American GSM carriers to support subscriber roaming and short message service (SMS). SCCP gateway services are necessary to facilitate roaming between North American GSM carriers, who utilize ANSI SS7 standards for inter-carrier signaling, and GSM carriers throughout the rest of the world, who utilize ITU-T C7 standards. TSI's service supports both one-way and bi-lateral routing depending on the choice of the GSM carrier and their roaming partners. Through a single connection to TSI, Belgacom provides connectivity to North American carriers and major SS7 providers located throughout Europe and Asia.

"The GSM association recently announced that the number of worldwide users of GSM mobile phones could reach nearly a billion subscribers this year, but the majority of national wireless carriers in the United States use CDMA or TDMA technology," said Eugene Bergen Henegouwen, TSI managing director for Europe. "TSI's cross-continental solutions for interoperability and connectivity overcome incompatibilities between these technologies to enable subscribers to take advantage of both voice services and international messaging on a worldwide basis."

"We're delighted to have completed this agreement with TSI," said Bridget P. Cosgrave, president carrier and wholesale business unit at Belgacom. "Belgacom's mission is to enable global interworking, even across communication standards. This agreement complements our efforts in the creation of Belgacom's Global Mobile Village. We're happy that our customers can now benefit from this unique success factor in providing their customers a truly global user experience."

About TSI

TSI Telecommunication Services Inc. (TSI) is a global communications technology company specializing in innovative business and network engineering solutions that manage and interconnect voice and data systems in more than 30 countries throughout the Americas, Asia Pacific and Europe. TSI provides technology interoperability, network services and number portability to nearly 300 mobile carriers, wireline carriers, emerging telecom market entrants and enterprise customers. Products include SS7 intelligent network solutions, clearing and settlement services, voice and data roaming facilitation, revenue enhancement solutions and more than 25 other integrated services. TSI is ISO 9001:2000 certified. TSI is a privately owned corporation headquartered in Tampa, Fla., U.S.A., with offices in major cities throughout the United States and offices in The Netherlands, London, Luxembourg, Rome, Beijing and Hong Kong. For more information, visit www.tsiconnections.com.

CUSIP: 87287VAB8 Bloomberg Tickers: TSITEL (Bond) 32497Z (Equity)

About Belgacom Carrier & Wholesale

Belgacom Carrier & Wholesale, a business unit of Belgacom SA, is a major supplier of wholesale voice, data and capacity services worldwide. It has recently been awarded the World Communication Award 2003 in the category of 'Best Wholesale Carrier'. Given Belgacom's continued growth in carrier traffic and solid financial rating, further network deployment is foreseen, as an example, we have added this year a new Sale office in Dubai to reinforce our worldwide sales offices presence of Brussels, Singapore and New York. Belgacom Carrier & Wholesale is committed to leverage telecom knowledge and experience to deliver high-quality, cost-effective wholesale solutions and fast provisioning intervals to its customers operating in Europe and worldwide. For more information, visit www.belgacom.be\carrier.

Cautions about Forward Looking Statements

This press release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These include, but are not limited to, statements regarding the Company's plans, intentions and expectations. Such statements are inherently subject to a variety of risks and uncertainties that could cause actual results to differ materially from those projected. Given these concerns, investors and analysts should not place undue reliance on forward-looking statements.