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Dialog 3213
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. If you get a tone that is not described or you cannot
identify, ask your system administrator.
Dial tone
Special dial tone
Ringing tone or every 4th second
Queue tone
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
*
Intrusion tone is only available on newer versions of the telephone exchange.