Audible Signals; Tone Characteristics - Ericsson DT290 User Manual

Dial tone
Special dial tone
Ringing tone or Queue tone
Busy tone
Congestion tone
Number unobtainable tone
Call waiting tone
Intrusion tone
Conference tone
Verification tone
Warning tone, expensive route
BusinessPhone – Cordless phone DT290

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 differing tone for one or more
situations.
every 4th second
every 15th second (to all parties)
Audible Signals
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