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

 

BusinessPhone – Cordless DT590

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Ericsson DT590 manual Audible Signals, Tone Characteristics