Ericsson dt590 User Manual

121

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