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:
Sitting safely
The ideal seating position can make a vital contribution
to relaxed, fatigue-free driving.
The seating position plays an important role in
an accident in combination with:
▷ Safety belts.
...
Switching on automatically
Select transmission position R with the engine
running.
The backup camera image is displayed if the
system was switched on via the iDrive. ...
Long-term vehicle storage
Your service center can advise you on what to
consider when storing the vehicle for longer
than three months. ...