AIOD leads:
Terminal equipment leads used solely to transmit
automatic identified outward dialing[?] (AIOD)
data from a
PBX to the
public switched telephone network or to switched service networks (
e.g., EPSCS), so that a vendor can provide a detailed monthly bill identifying long-distance usage by individual PBX stations, tie trunks, or the attendant.
Source: from Federal Standard 1037C and from the Code of Federal Regulations, Telecommunications Parts 0-199