Caller ID (caller identification, CID), also called calling line identification (CLID), Calling Line Identification (CLI), calling numberdelivery (CND), calling number identification (CNID), calling line identification presentation (CLIP), or call display, is a telephone service, available in analog and digital telephone systems, including VoIP, that transmits a caller's telephone number to the called party 's telephone equipment when the call is being set up. The caller ID service may include the transmission of a name associated with the calling telephone number, in a service called CNAM.
The recipient may inspect the information before answering the call on a display in the telephone set, on a separately attached device, or on other digital displays, such as cable television sets when telephone and television service is provided by the same vendor.
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