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Handset Tones
System 25 signals you with tones that are heard through the
handset. The tones and their descriptions are listed below.
DIAL TONE
lllllllllllllllllllllllllllllllllllllllllllllllllIll (a continuous steady tone)
You can dial.
CONFIRMATION TONE
II II II (three short tones)
Your action has been accepted.
RINGBACK TONE
IIIIIIIIIIIIIII IIIIIIIIIIIIIII (repeating on/off tone)
The number you dialed is ringing.
SPECIAL RINGBACK TONE
IIIIIIIIIIIIIIIII 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
Ill Ill Ill Ill (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)
III III (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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