TeleCommunication Systems Contact Information www.telecomsys.com About our Company TeleCommunication Systems, Inc. (TCS) (NASDAQ: TSYS) produces wireless data communications technology solutions including wireless and VoIP E9-1-1 network-based services, secure deployable communication systems, engineered satellite-based services, and commercial location applications. Customers include VoIP carriers around the world, and agencies of the U.S. Department of Defense, State, and Homeland Security.