ANNAPOLIS, MD and EDISON, NJ - July 19, 2005 - Vonage, the leading provider of broadband phone service, has selected TeleCommunication Systems (TCS) (NASDAQ:TSYS), a leading provider of precise location and wireless data technology, to provide critical Enhanced 9-1-1

(E9-1-1) technology components for Vonage's Voice-over-Internet Protocol (VoIP) customers.

Under the new agreement, TCS will deliver ALI (Automatic Location Identification) steering, call routing, call center and other services enabling Vonage to meet the new E9-1-1 requirements for interconnected VoIP Service Providers. The TCS VoIP E9-1-1 service is designed for mobility and provides a complete solution for static, nomadic and, ultimately, mobile VoIP users. Vonage pioneered the broadband phone industry; setting the standard for pricing, features, call quality and reliability for the entire VoIP category. Together, Vonage and TCS will set the bar for delivering a flexible, standards-based E9-1-1 solution to its customers and the public safety community.

"Vonage is absolutely committed to providing our customers with the best service available. Their safety is paramount," said Jeffrey Citron, Chairman and CEO of Vonage Holdings, Corp. "The relationship with TCS leap-frogs fixed VoIP E9-1-1 services, providing our subscribers with a new level of confidence and security. TCS was the first company to provide a solution for E9-1-1 in wireless, and they have shown similar ingenuity in helping us to address the challenges of providing E9-1-1 for VoIP. VoIP is growing rapidly, and we are pleased that this solution is designed to bring our subscribers immediate and direct contact with the needed emergency services. With TCS, we are now poised to rapidly deploy life-saving services across our U.S. and Canadian footprints."

In June 2005, the FCC published its E9-1-1 Order requiring all interconnected VoIP providers to automatically provide E9-1-1 services to all customers as a standard, mandatory feature without customers having to specifically request this service, and without the ability to opt-out.

"The Association of Public Safety Communications Officials (APCO) is pleased to see industry partners work proactively in developing a comprehensive E9-1-1 VoIP delivery service solution for emergency services," said Greg Ballentine, President of APCO.

"TCS is working with Vonage, the FCC, the public safety community, major standards bodies and industry associations to provide the most comprehensive and accessible E9-1-1 VoIP call routing and delivery service in the U.S. Our customers are better enabled to meet the FCC Order," said Maurice B. Tosé, Chairman, President and Chief Executive Officer for TCS. "We believe the combined efforts of TCS and Vonage will address the immediate needs of the emerging VoIP market for public safety. TCS already has begun to provide Vonage customers with live operator call support and we are mobilizing our deployment teams to accelerate delivery of our standards-based i2 solution across the Vonage network. As a pioneer in wireless E9-1-1, we are honored to be providing this life-saving E9-1-1 VoIP solution to Vonage, the pioneer for broadband phone service."

ABOUT VONAGEr

Vonage has pioneered the broadband phone industry, setting the standard for pricing, features, call quality and reliability for the entire VoIP category. Vonage's award winning service is sold on the web and through national retailers like SAM's Club, RadioShack, Best Buy, Circuit City, Staples, Fry's Electronics, Office Depot and CompUSA. Vonage Holdings Corporation is headquartered in Edison, New Jersey. For more information about Vonage's products and services, please visit http://www.vonage.com or call 1-VONAGE-HELP. Vonage(R) is a trademark of Vonage Marketing, a subsidiary of Vonage Holdings Corp.

ABOUT TELECOMMUNICATION SYSTEMS, INC.

TeleCommunication Systems, Inc. (TCS) (NASDAQ:TSYS) is a leading provider of mission critical wireless data technology. TCS-designed systems include location and messaging products deployed in wireless carrier networks, applications in enterprise networks for functions including logistics management and proof of delivery, and highly secure deployable communication systems used for government intelligence and defense. Messaging and location-based services, including wireless E9-1-1, and direct wireless applications are hosted in the company's TL-9000-certified network operations centers and may be available directly from the company or through subscriptions via wireless carriers. For more information visit www.telecomsys.com.