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 |
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Intrusion tone |
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Conference tone | repeated after 15 s (to all parties) |
Verification tone |
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Warning tone, expensive route |
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BusinessPhone – Cordless DT590 | 121 |