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 rock ...

(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 interpret ...

from a PBX to the

public switched telephone network The public switched telephone network (PSTN) provides infrastructure and services for public telecommunication. The PSTN is the aggregate of the world's circuit-switched telephone networks that are operated by national, regional, or local telep ...

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 col ...

. 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 c ...

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 A ...

Notes

Telephony {{telephony-stub