AASTRA 600d for Aastra 800 and OpenCom 100 User Guide EN - Manual (Page 47)

Basic Functions
45
Muting Mobile Unit
If you do not want the caller to hear, e.g. what you are discussing with someone else in
the room, you can temporarily mute your mobile unit.
Muting
Press the
softkey. The symbol appears in the upper line of the display. The
caller on the telephone can no longer hear you.
Cancel muting
When you wish to talk to the caller again, press the
softkey once again. The caller
on the telephone can hear you again.
Illumination/Display Dimming
Keypad and display are illuminated. Illumination is switched on anytime a key is
pressed or a call made and remains switched on for a configurable time. To prevent a
complete deactivation of display illumination after this time, you can activate the dim
function. Illumination remains switched on but at lower intensity. This setting reduces
battery operating times. You can make changes in the
> Settings >
Illumination > Display dimming / Keypad / Display menu (see page 130).
Switching on display illumination
If display illumination is completely switched off, you can switch it on with one of the
three softkeys below the display without executing the function assigned to those
keys.
Display: Change Brightness/Contrast
Aastra 610d
Adjust the display brightness to suit your prevailing environment. Change the con-
trast in the
> Settings > Display > Contrast menu (see page 130).
Aastra 620d, Aastra 630d
Adjust the display brightness to suit your prevailing environment. Change the
brightness in the
> Settings > Display > Brightness menu (see page 130).