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Alarm systems. Alarm transmission systems and equipment - Requirements for systems with voice communicators using the public switched telephone network Ingestion-build-258901 iso-octane and 95 % v/vAlarm systems Alarm transmission systems and equipment Part 1 4: Requirements for systems with voice communicators using the public switched telephone network Executive summary Requirements for alarm systems with voice communicators using the public switched telephone network. Abstract This European Standard specifies the requirements for voice communicator systems utilizing the public switched telephone network which are in addition to those