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Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. In telephony, ANI service was originally created by AT&T Corporation for internal long distance charging purposes,〔(US Patent 2,265,844: Calling Line Identification Circuit )〕〔(US Patent 2,300,829: Calling Line Identification System )〕 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. == Toll-free numbers == Modern toll-free telephone numbers, which generate itemized billing of all calls received instead of relying on the special fixed-rate trunks of the Bell System's original Inward WATS service, depend on ANI to track inbound calls to numbers in special area codes such as +1-800, 888, 877, 866, 855 and 844 (United States and Canada), 1800 (Australia) or 0800 and 0808 (United Kingdom). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Automatic number identification」の詳細全文を読む スポンサード リンク
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