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 MIL-HDBK-232A
4.8 Administrative telephones. The administrative telephone system in a
facility must be installed so that signals emanating from RED processors
cannot couple onto egressing lines, and classified conversations cannot be
monitored during on-hook conditions. The design and installation must assure
total separation of telephone signal lines from all other signal Disconnect
devices, noninductive ringers, and speech suppression techniques should be
used to prevent the telephone from being used as a fortuitous, surreptitious
probe into the LEA.
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