• CCITT Rec. V.25 (11/1988) – AUTOMATIC ANSWERING EQUIPMENT AND/OR PARALLEL AUTOMATIC CALLING EQUIPMENT ...
  • 1 Scope
  • 2 Abbreviations and definitions
  • 3 Interface procedures at call-originating data station
  • 4 Interface procedure at answering data station
  • 5 Proposed line procedures
  • 6 Manual data station calling automatic answering data station
  • 7 Automatic calling data station calling manual data station
  • 8 Disabling of echo suppressors in the case of manual data stations
  • 9 Protection of ordinary telephone users
  • 10 Manual selection of automatic answering, data mode and voice mode
  • 11 2100-Hz tone recognition
  • References