---

• CCITT Rec. V.25bis (11/1988) – AUTOMATIC CALLING AND/OR ANSWERING EQUIPMENT ON THE GENERAL SWITCHED TELEPHONE NETWORK (GSTN) ...
• 1 Scope
• 2 Abbreviations and definitions
• 3 General
• 4 Addressed call and/or answer authorized by the DTE (circuit 108/2)
  • 4.1 Interface procedure
  • 4.2 Interface procedures at the calling data station
  • 4.3 Interface procedures at the answering data station
• 5 Direct call and/or answer controlled by the DTE (circuit 108/1)
  • 5.1 Interchange circuits involved
  • 5.2 Interface procedure at the calling data station
  • 5.3 Interface procedure at the answering data station
• 6 Line procedures
  • 6.1 Line procedure at the calling DCE
  • 6.2 Line procedure at the answering DCE
• 7 Manual calling and answering
• ANNEX A – Test facilities
• A.1 DCE self-test stage
• A.2 DCE test with maintenance centre
• ANNEX B – SDL Description of the addressed call - 108/2 Response Mode
• APPENDIX I – General description of the V.25 bis command/indication syntax