![]() ![]() 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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