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Federal Secure Telephone Service

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 abbreviation FSTS. 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,