EFJohnson (R), founded in 1923 and based in Irving, Texas is an EFJ Incorporated subsidiary that supplies federal, state, and local public safety and agencies with wireless mobile radio equipment. The company also markets systems to the military. The firm develops digital and analog products, focusing on the design of Voice over IP (VoIP) systems. The company's systems integrate voice and data communications processing. EFJohnson also develops private wireless communications systems for federal agencies. The firm's Conventional IP25 (TM) Infrastructure Systems support the deployment of Project 25 Voice over IP (VoIP) networks. The scalable systems streamline analog-to-digital migration processes. The products' base stations support analog and digital subscribers. The systems include encryption key management features. EFJohnson's Trunked IP25 (TM) Infrastructure System is a Project 25 trunking system designed for the first responder sector. It integrates with legacy systems and complies with NTIA narrowband VHF and UHF frequency standards. EFJohnson radios are employed by military, police, fire department, paramedic, and homeland security personnel. EFJohnson originally was established as mail order business. The firm manufactured its first radios in 1925. The company began developing business and industrial radios in 1961. In 1975, it worked with Bell Telephone Laboratories in manufacturing cell-site radio transmitters, employed in Bell's cellular radio system. The company was acquired by Transcrypt International in 1997. In 2001, EFJohnson introduced its SMARTNET (R)/SmartZone (R), Multi-Net, and Project 25 portable radios. EFJohnson went public in 1976, with shares listed on the New York Stock Exchange. Parent company EFJ Incorporated is listed on NASDAQ under the EFJI symbol.