Automatic number identification (ANI)[1][2] is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by the American Telephone and Telegraph Company (AT&T) for long distance service in the Bell System,[3][4] eliminating the need for telephone operators to manually record calls.
Modern ANI has two components: information digits, which identify the class of service,[5] and the calling party billing telephone number.
The term is also used to describe the functions of two-way radio selective calling that identify the transmitting user.
ANI is distinct from newer caller ID services, such as call display, which are solely for informing a subscriber.
^Anthony Ramirez (April 4, 1992). "Caller ID: Consumer's Friend or Foe?". The New York Times. Retrieved September 21, 2022.
^"The Pizza Version of Dialing '911'". The New York Times. September 9, 1991.
^US Patent 2,265,844: Calling Line Identification Circuit
^US Patent 2,300,829: Calling Line Identification System
^"ANI II Digits". North American Numbering Plan Administration. 2003. Archived from the original on June 18, 2007. Retrieved July 6, 2007.
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