AIOD leads

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