AASTRA 4222 Office for MX-ONE (TSE) User Guide EN - Manual (Page 11)

11 Dialog 4220 Lite/Dialog 4222 Office
Description
Tones and signals
The following different tones and signals are sent from the exchange to
your phone.
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.
Dial tone
Special dial tone
Ringing tone or queue tone
Busy tone
Congestion tone
Number unobtainable tone
Call waiting tone
Intrusion tone
Conference tone every 15 seconds (to all parties)
Verification tone
Warning tone, expensive route