Switching the microphone to mute
When a call is active, the microphone can be muted.
1. "Telephone".
2. "Active calls".
3. 
"Microphone mute"
A microphone that has been switched to mute is automatically reactivated:
▷ When a new connection is established.
▷ When switching between call parties.
See also:
Displaying overview
1. Select the subdirectory if necessary.
2. Select "Overview".
Select "Overview"
3. Press the
button.
It may take some time until the overview is completely
displayed.
...
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The X3's redesigned interior continues the sparse, minimalistic design
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All around the center console
1. Headliner
2. Control Display
3. Glove compartment
4. Air vent
5. Hazard warning system
Central locking system
6. Radio
CD/Multimedia
7. Automatic climate ...