Automatic number identification (ANI) 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 AT&T Corporation for internal long distance charging purposes, eliminating the need for telephone operators to manually request the number of the calling party for a toll call.
Modern ANI has two components: information digits, which identify the class of service, and the calling party billing telephone number.
ANI is not related to newer caller ID services such as call display.
Automatic number identification is also used to describe the functions of two-way radio selective calling that identify the transmitting user.
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