The information received from the service is displayed on a telephone display screen, on a separately attached device, or on other displays, such as cable television sets when telephone and television service is provided by the same vendor. The service was first defined in 1993 in International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) Recommendation Q.731.3. The caller ID service may include the transmission of a name associated with the calling telephone number, in a service called Calling Name Presentation (CNAM). Caller-ID system response sounds in various cases: analog, ISDN and digital PBXĬaller identification ( Caller ID) is a telephone service, available in analog and digital telephone systems, including voice over IP (VoIP), that transmits a caller's telephone number to the called party's telephone equipment when the call is being set up.
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