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Dialog 4223 Professional/Dialog 4225 Vision120
To activate Headset Preset:
Í
Press and hold for at least 4 seconds.
A short acknowledgement tone signal is heard, and the Headset
Preset symbol is shown in the display.
Note: You can also activate Headset Preset, via the
PhoneSet
menu.
To cancel Headset Preset:
 Press and hold for at least 4 seconds.
A short acknowledgement tone signal is heard, and the Headset
Preset symbol is switched off in the display.
Note: You can also cancel Headset Preset, via the
PhoneSet
menu.
Headset volume
During a call, use the Volume keys to change the volume of the
headset.
ì Press to change the volume.
The set headset volume level is stored.
To adjust the volume for the loudspeaker of the phone during
Group Listening:
ÏÍ
Press.
ì Press to change the volume.
The Loudspeaker volume level is stored.
Í
Â
Press.
For those with impaired hearing, the headset hearing volume level
can be further amplified, use the same procedure as described in
section “Handset and loudspeaker volume” on page 105.