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121BusinessPhone – Cordless DT590
Audible Signals
Audible Signals
The following different tones 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 different tone for one or more
situations.
Dial tone
Special dial tone
Ringing tone or Queue tone repeated after 4 s
Busy tone
Congestion tone
Number unobtainable tone
Call waiting tone
Intrusion tone
Conference tone repeated after 15 s (to all parties)
Verification tone
Warning tone, expensive route