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In some countries, the terms caller display, calling line identification presentation, call capture, or just calling line identity are used; call display is the predominant marketing name worn in Canada (though customers often call it caller ID)
- The abstraction of CNID as a service for plain old telephone service (POTS) subscribers originated from automatic decimal identification (ANI) as a Talking Caller ID branch of toll free number service in the United States
Similarly, some countries accord anonymous caller rejection, which rejects all calls when the subscriber's numeral is blocked. Some telephone companies protect their clients from receiving blocked break by routing anonymous calls to a service, where the caller is demanded to announce him or herself. The service then asks the called party if they want to accept or reject the call. Blocking the numeral is referred to as Calling Line Identification Restriction. Emergency services will most likely be able to show the restricted number using a service called Calling Line Identification Restriction Override, or by using general ANI services.