Importance

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Abstract

A communication unit utilizes a caller management unit which monitors in-house lines and detects a caller side calling code included in a calling set up message applied at the time of reference. A control unit stores the detected calling code in one memory region of a memory and reads out the stored calling code from the memory region in response to an output request to produce information corresponding to the calling code. The management unit displays the information produced by the control unit. The memory has another memory region for storing a plurality of predetermined calling codes and caller specification information corresponding to each calling code. The control unit stores the detected calling code into the one memory region in response to a non-response detection to reference by the line monitor. The control unit further makes a determination whether a calling code coinciding with the calling code stored in the one memory region is stored in the other memory region in response to an output request and displays the caller specification information corresponding to the calling code when coincidence is detected, while displaying only the detected calling code when a non-coincidence is detected.

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First Claim