AASTRA 4225 for MX-ONE Telephony Switch - Manual (Page 120)

Accessories
Dialog 4223 Professional/Dialog 4225 Vision 120
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:
Â
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:
П Н
Press.
ì
Press to change the volume.
The Loudspeaker volume level is stored.
Н В
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.