Aastra Dialog 4223 Professional User Manual page 101

Settings
Dialog 4225 Vision:
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PhoneSet
Select in the top menu (see display).
Down Up
or Press to frame (see display).
Set Hearing Level
Select
Press (see display).
A tone signal is heard, and the display shows the current setting. The
Line 1 key lamp also indicates the current setting;
key lamp off=standard level, key lamp on=increased level.
Change
Press to change the volume level (see display).
The display shows the new setting. The Line 1 key lamp also indicates
the new setting as described above.
Exit
Press to finish setting (see display).
When extra amplification has been selected, the Line 1 key lamp turns
off.
Dialog 4223 Professional/Dialog 4225 Vision 101