Automatic number identification

ANIautomatic number identification (ANI)the caller's number
Automatic number identification (ANI) is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes.wikipedia
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Toll-free telephone number

toll-freetoll-free number800 number
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, 844 with 833 and 822 reserved for future toll free use (United States and Canada), 1800 (Australia) or 0800 and 0808 (United Kingdom).
The system initially provided no support for Automatic Number Identification and no itemised record of calls, instead requiring subscribers to obtain expensive fixed-rate lines which included some number of hours of inbound calling from a "band" of one or several U.S. states or Canadian provinces.

Long-distance calling

long distancelong-distancelong distance call
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.
The caller would dial the long-distance operator (typically ‘110’ or ‘211’ in large Bell System cities of that era; ’0’ was for local assistance) and provide the destination city name and called number as well as their own number for billing purposes (there was no automatic number identification).

Telephone number

phone numbertelephone numbersphone numbers
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 (ANI)

Automatic number announcement circuit

ANAC958-ANACautomatic number announcement
ANI is used to provide automatic number announcement, an internal test facility for telephone maintenance workers.
Automatic number announcement systems are based on automatic number identification, and meant for phone company technicians, the ANAC system works with unlisted numbers, numbers with caller ID blocking, and numbers with no outgoing calls allowed.

Party line (telephony)

party lineparty linestelephone party line
ANI is also not supported properly for calls originated from four-party lines.
Systems which identify the caller's name and address to emergency telephone numbers (such as Enhanced 9-1-1 in North America) may be unable to identify which of multiple parties on a shared line placed a distress call; this is aggravated by the use of old mechanical switching equipment for party lines as this obsolete apparatus consistently provides no caller ID and often also lacks automatic number identification capability.

Caller ID

caller line identificationCLIcall display
ANI is not related to newer caller ID services such as call display. United Kingdom: Caller Line Identification (CLID)
The idea of CNID as a service for POTS subscribers originated from automatic number identification (ANI) as a part of toll free number service in the United States.

Dialed Number Identification Service

call trackingdialed number identification services
A related service feature available to private branch exchange subscribers is the Dialed Number Identification Service (DNIS), a code indicating the number requested by the caller.
* Automatic number identification

Calling party

callercall originatorcall
Modern ANI has two components: information digits, which identify the class of service, and the calling party billing telephone number.

Two-way radio

two way radioRadio Operator2-way radio
Automatic number identification is also used to describe the functions of two-way radio selective calling that identify the transmitting user.

Selective calling

two-tone sequential pagingMotorola Quik Call Ipulsed radio codes
Automatic number identification is also used to describe the functions of two-way radio selective calling that identify the transmitting user.

Bell System

BellBell Operating CompaniesBell Telephone
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, 844 with 833 and 822 reserved for future toll free use (United States and Canada), 1800 (Australia) or 0800 and 0808 (United Kingdom).

Wide Area Telephone Service

InWATSWATS WATS lines
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, 844 with 833 and 822 reserved for future toll free use (United States and Canada), 1800 (Australia) or 0800 and 0808 (United Kingdom).

Telephone numbering plan

Area codeCalling codearea codes
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, 844 with 833 and 822 reserved for future toll free use (United States and Canada), 1800 (Australia) or 0800 and 0808 (United Kingdom).

Voice over IP

VoIPvoice over Internet Protocolvoice-over-IP
Placing a call through an outbound-only VoIP service or some calling cards will cause a non-working number to be sent as the ANI.

Telephone card

calling cardphone cardphone cards
Placing a call through an outbound-only VoIP service or some calling cards will cause a non-working number to be sent as the ANI.

Plant test number

a range reserved for testing purposes
The service, which is not advertised to the public, allows an installer to identify an individual line by using it to dial a special unpublished number in a range reserved for testing purposes (such as 958-xxxx in much of North America).

Business telephone system

PBXprivate branch exchangekey telephone system
A related service feature available to private branch exchange subscribers is the Dialed Number Identification Service (DNIS), a code indicating the number requested by the caller.

Call centre

call centercall centerscall centres
With the information, a service provider can have several toll-free numbers directed to the same call center and provide unique service based on the number dialed.

Australia

🇦🇺AUSAustralian
Australia: Automatic number identification (ANI) 1800801920 or 12722123 (Telstra line only, local call cost)

Computer telephony integration

CTIcomputer telephonycomputer controlled telephone system
Screen popping - Call information display (caller's number (ANI), number dialed (DNIS), and Screen pop on answer, with or without using calling line data. Generally this is used to search a business application for the caller's details.

Enhanced 9-1-1

E911enhanced 911Wireless Enhanced 911
The caller's phone number is known as an ANI.

Machine to machine

M2Mmachine-to-machinemachine to machine (M2M)
This system, similar but distinct from the panel call indicator of the 1920s and automatic number identification of the 1940s, which communicated telephone numbers to machines, was the predecessor to what is now caller ID, which communicates numbers to people.