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Telephone line signalling
Descriptive information about the various signals from/to the PSTN
  • Tones from PSTN
  • Busy tone
  • Call waiting tone
  • Caller waiting tone
  • Comfort tone
  • Conference tone
  • Confirmation tone
  • Congestion tone
  • Dial tone
  • Disconnect tone
  • End of three party service tone
  • Executive override tone
  • Holding tone
  • Howler tone
  • Intrusion tone
  • Line lock-out tone
  • Negative indication tone
  • Notify tone
  • Number unobtainable tone
  • Off-hook warning tone
  • Pay tone
  • Payphone recognition tone
  • Preemption tone
  • Queue tone
  • Recall dial tone
  • Record tone
  • Ringing tone
  • Search tone
  • Second dial tone
  • Special dial tone
  • Special information tone
  • Waiting tone
  • Warning tone
    		•

  • Even more tones from PSTN

  • ITU-T annex to E.180 (obsolete)


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