AASTRA 600c_d for OpenCom 1000 User Guide EN - Manual (Page 33)

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Switching ringer off at call
If you want to switch off the ringer for a call that has just come in, press the C key. You can still
accept the call as long as the caller has not hung up.
Illumination / display dimming
The keyboard and display are lit. The illumination is activated each time a key is pressed or a call is
made; it remains lit for a user-definable amount of time. To prevent the display illumination from
switching itself off completely after that time, you can activate the display dimming. The illumina-
tion then (for max. 4 hours) remains lit at a weak level. This setting does however reduce the battery
life. You can make changes in the Menu ❯❯❯ -> Settings -> Illumination -> Keyboard/Display/
Display dimming .
Activating the display illumination
If the display illumination is switched off completely, you can activate it using one of the three keys
below the display (softkeys) without triggering the function stored under that key.
Changing the brightness/contrast of the display
Aastra 610d
Adjust the brightness of the display to your local conditions. Change the contrast in the Menu ❯❯❯
-> Settings -> Display -> Contrast .
Aastra 612d /620d/622d/630d/632d/650c
Adjust the brightness of the display to your local conditions. Change the brightness in the Menu
❯❯❯
-> Settings -> Display -> Brightness.
Muting the handset
If you do not want your call partner to listen in while you talk to someone in the room for instance,
you can temporarily mute your handset.
You are making a call.
Press the
softkey. The symbol appears on the top line of the display.
Your call partner on the telephone can no longer hear you.
Basic functions