AASTRA 4422 IP Office (SIP) for MX-ONE User Guide - Manual (Page 12)

Description
Dialog 4422 IP Office 12
Tones and signals
The following different tones and signals are sent from the
telephone system 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
Ring tone or queue tone
Busy tone
Congestion tone
Number unobtainable tone
Call waiting tone
or verification tone
Intrusion tone
Conference tone every 15 seconds (to all parties)
Hold tone
Connection in progress tone