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Caller display uses the CLIP (Caller Line Identification Presentation) or ANI (Automatic Number Identifier) passed by the Telephone Company via the trunk line. For caller display on analog phones CLIP/ANI is converted to the analog version of the call display service. CLIP/ANI is also used by PC programs such as PhoneManager and the PC TAPI interface. Thus users can see the telephone number of the person calling. Extensions can be configured to enable or disable Caller Display.

With caller display, the directory feature is used to assign names to recognized numbers.

Avaya IP Office Phone System Features List