Silent Ringing; Ring Signal Volume; Mute Ring Signal - Ericsson Dialog 4223 Professional User Manual

Settings
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Ring signal volume

Use the Volume keys to adjust the ring signal volume when the
phone is idle or ringing. Adjusted volume is stored.
Press to change the volume.
A volume symbol is shown for a few seconds (replacing your
extension number).

Mute ring signal

You can supress the ring signal for an incoming call.
Press to supress the ring signal.
The ring signal is switched off for the current call.

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.
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.
Dialog 4223 Professional