
DT690 DESCRIPTION
3.4 Tones
The following different tones are sent from the exchange to your phone.
Tone Description
Dial tone
Special dial tone
Ringing tone or queue tone
Busy tone
Congestion tone
Number unobtainable tone
Call waiting tone
Intrusion tone
Conference | every 15 seconds (to all parties) |
tone |
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Verification tone
Warning tone, expensive route
| 32 |