Handset Tones
System 25 signals you with tones that are heard through the handset. The tones and their descriptions are listed below.
DIAL TONE lllllllllllllllllllllllllllllllllllIllllllllllllllll (a continuous steady tone)
You can dial.
CONFIRMATION TONE II II II (three short tones) Your action has been accepted.
RINGBACK TONE IIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIII(repeating on/off tone) The number you dialed is ringing.
SPECIAL RINGBACK TONE IIIIIIIIIIIIIIIIIIIIIIIIIIII II (one long tone and one short, dull tone)
The person you dialed is busy, and has been notified of Call Waiting.
BUSY TONE IIIII IIIII IIIII (repeating on/off tone)
The number you dialed is busy.
FAST BUSY TONE III III III III (fast repeating on/off tone) The number you dialed was busy, misdialed, or restricted.
CALL WAITING TONE (short tone(s) heard during a call)
III(the waiting call is an inside call)
Ill Ill (the waiting call is an outside call)
You have a call waiting to be answered.
QUEUEING TONE II II II II II (five short tones)
Your request for a callback has been confirmed.
DEQUEUEING TONE II II II (three short tones)
The extension or outside line that you requested for callback is now available.
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