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:
Vehicle information
Owner's Manual
Computer
Vehicle
...
Remove attached parts following use
Remove auxiliary mirrors, roof or rear luggage
racks which are no longer required following
use.
Attached parts on the vehicle impair the aerodynamics
and increase the fuel consumption. ...
Adjusting the volume
Turn the knob until the desired volume is selected.
The setting is stored for the remote control
currently in use.
The vehicle automatically adjusts the volume of
the microphone on the telephone ...