Vonage(R) and TCS Launch VoIP E9-1-1 Public Safety Outreach Campaign

TCS' Deployment Experience Provides Vital Connection to Public Safety Communities

ANNAPOLIS, Md. & EDISON, N.J.--(BUSINESS WIRE)--Aug. 2, 2005--Vonage, the leading provider of broadband phone service, has joined forces with TeleCommunication Systems (TCS), a leading provider of precise location and wireless data technology, to provide the vital introduction to thousands of Public Safety Answering Points (PSAPs) throughout the United States.

Beginning in mid-August, Vonage will be sending Voip Enhanced 9-1-1 (E9-1-1) kits to introduce Vonage's E9-1-1 services to PSAPs nationwide. TCS deployment professionals will follow up within a few weeks of initial contact to collect relevant PSAP data. The program is designed to provide the PSAP community with information regarding Vonage's approach and process for E9-1-1 rollout within the FCC's 120-day deadline, and how the public's safety needs will continue to be met in the interim.

Jeffrey A. Citron, Chairman and CEO of Vonage Holdings, Corp. stated, "Our ongoing relationship with TCS and their proven E9-1-1 deployment experience with wireless makes this communications and outreach program a natural extension of our broader 120-day rollout plan for E9-1-1."

Greg Rohde, Executive Director of the E9-1-1 Institute said, "This partnership demonstrates the encouraging progress that is being made by industry to enhance public safety. I applaud their efforts."

"TCS has served the Public Safety community via wireless E9-1-1 for years. We are looking forward to the direct interface with a majority of the PSAPs we currently serve, as we bring a viable E9-1-1 Voip solution to Vonage customers. Our joint effort will establish Vonage as the Voip E9-1-1 industry leader; we are proud to work with them," said Maurice B. Tose, Chairman, President and Chief Executive Officer for TCS.

ABOUT VONAGE®
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 www.vonage.com or call 1-VONAGE-HELP. Vonage® is a trademark of Vonage Marketing, a subsidiary of Vonage Holdings Corp.

ABOUT TELECOMMUNICATION SYSTEMS, INC.
TeleCommunication Systems, Inc. (TCS) 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.

This announcement contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities and Exchange Act of 1934, as amended. These statements are based upon TCS' current expectations and assumptions that are subject to a number of risks and uncertainties that would cause actual results to differ materially from those anticipated.

The actual results realized by the Company could differ materially from the statements made herein, depending in particular upon the risks and uncertainties described in the Company's filings with the Securities and Exchange Commission (SEC). These include without limitation risks and uncertainties relating to the Company's financial results and the ability of the Company to (i) reach and sustain profitability as early as anticipated, (ii) continue to rely on its customers and other third parties to provide additional products and services that create a demand its products and services, (iii) adapt and integrate new technologies into its products, (iv) expand its business offerings in the new wireless data and broadband telephony industry, (v) develop software without any errors or defects, (vi) protect its intellectual property rights, and (vii) implement its sales and marketing strategy.

Existing and prospective investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. The Company undertakes no obligation to update or revise the information in this press release, whether as a result of new information, future events or circumstances, or otherwise.