85Dialog 3210, 3211 and 3212
Audible Signals
Audible Signals
The following different tones and signals are sent from the
exchange to your telephone.
Tone characteristics
The tones shown in this section are the most used tones
worldwide. Many markets use a differing tone for one or more
situations
Dial tone
Special dial tone
Ringing tone or Queue tone every 4th second
Busy tone
Congestion tone
Number unobtainable tone
Call waiting tone
Intrusion tone
Conference tone every 15th second (to all parties)
Verification tone
Warning tone, expensive route
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