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Line Interface Unit (LIU) - Telephone or PABX Extension Port Interface for PA or Loudspeaker Talk Back Systems. Suits Analogue Telephone Lines, Centrex Lines, Analogue PABX Ports, also can be used for interface telephone (intercoms) lines in to the Crestron System. Automatic release on far end disconnect. Force release, optional time out, relay output available for control functions during release if required.
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