In land-line telephony, AIOD leads are

Terminal equipment In telecommunication, the term terminal equipment has the following meanings: * Communications equipment at either end of a communications link, used to permit the stations involved to accomplish the mission for which the link was established. * I ...

leads used solely to transmit

automatic identified outward dialing Automatic may refer to: Music Bands * Automatic (band), Australian rock band * Automatic (American band), American rock band * The Automatic, a Welsh alternative rock band Albums * ''Automatic'' (Jack Bruce album), a 1983 electronic roc ...

(AIOD)

data In the pursuit of knowledge, data (; ) is a collection of discrete values that convey information, describing quantity, quality, fact, statistics, other basic units of meaning, or simply sequences of symbols that may be further interpreted ...

from a PBX to the

public switched telephone network The public switched telephone network (PSTN) provides Communications infrastructure, infrastructure and services for public Telecommunications, telecommunication. The PSTN is the aggregate of the world's circuit-switched telephone networks that ...

or to switched service networks (''e.g.,'' EPSCS), so that a vendor can provide a detailed monthly bill identifying

long distance calling In telecommunications, a long-distance call (U.S.) or trunk call (also known as a toll call in the U.K. ) is a telephone call made to a location outside a defined local calling area. Long-distance calls are typically charged a higher billing rate ...

usage by individual PBX stations,

tie trunk A tie line, also known as a tie trunk, is a telecommunication circuit between two telephone exchanges or two extensions of a private telephone system. See also *Private branch exchange *Circuit ID *Leased line *Private line In telecommunication, ...

s, or the

attendant console Attendant or attendance may refer to: * Car attendant, a railroad employee * Flight attendant, flight crew employed to ensure the safety and comfort of the passengers * Museum attendant * Toilet attendant, maintains standards in a toilet and coll ...

. It resembles

common channel signalling In telecommunication, common-channel signaling (CCS), or common-channel interoffice signaling (CCIS), is the transmission of control information ''( signaling)'' via a separate channel than that used for the messages, The signaling channel usually ...

in that the AIOD leads provide data for all trunks, but is used only for billing, thus resembling

automatic number identification 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 the Am ...

Notes

Telephony {{telephony-stub