Federal Secure Telephone Service

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A full-service switched secure-voice i.e., encrypted voice, telecommunications service designed to protect sensitive and security classified voice transmissions for the U.S. Government worldwide. Common abbreviationFSTS.Note 1: The Government Services Administration provides information security (INFOSEC) system and equipment protection services to U.S. domestic and worldwide agencies, including, but not limited to, the 50 states, Puerto Rico, Bermuda, the Virgin Islands, Canada, Mexico, Europe, and the Far East. Note 2: Federal Secure Telephone Service (FSTS) currently uses the STU-III Low-Cost Secure Voice/Data Terminal. See alsoAutomatic Digital Network, Automatic Secure Voice Communications Network, Automatic Voice Network, classified information, communications, communications security, encrypted voice, information security, secure line, secure telephone unit, security, security classified, switching, telecommunications service.