AASTRA 4422 IP Office (SIP) for MX-ONE User Guide - Manual (Page 81)

81 Dialog 4422 IP Office
Settings
Ring signal volume
Use the Volume keys to adjust the ring signal volume when the
phone is in idle mode or ringing. Adjusted volume is stored. ì
Press to adjust the volume.
Note: The volume will return to the default level in case of a
power failure.
Mute ring signal
You can suppress the ring signal for an incoming call. É
Press to suppress the ring signal.
The ring signal is switched off for the current call, and your phone is
automatically set to Silent Ringing.
Silent Ringing
If you do not want to be disturbed by the ring signal but still want to
be able to answer an incoming call, you can switch off the ring
signal. Incoming calls are only indicated by a flashing line lamp and
display information.
When the phone is in idle mode, or when ringing: É
Press to switch off the ring signal.
The Mute key lamp is switched on to indicate Silent Ringing. The
ring signal will automatically be switched on the next time you lift
the handset or press any key.