AASTRA 7433ip for MX-ONE User Guide EN - Manual (Page 22)

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A ASTRA 7433 IP D ESCRIPTION
Note: The volume will return to the default level in case of a power
failure.
2.7.1.2 Mute Ring Signal
To suppress the ring signal for an incoming call, do the following:
1. Press the key.
The ring signal is switched off for the current call, and the phone is
automatically set to Silent Ringing.
2. Answer the call.
2.7.1.3 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:
1. Press the key to switch off the ring signal.
The indicator is on to indicate silent ringing.
Note: The ring signal will be switched on automatically the next time you
lift the handset or press any key.
2.7.2 Tone Characteristics
Different ring tones sound with different cadences, see the list below.
Dial tone
Special dial tone
Ring tone or queue tone