My service advisor checked and advised that non of the current BMW's mute the satnav during a call. Apparently, they tested a 5 series with the same result.
The advice was to move the Idrive knob left in the call to mute the satnav. I pointed out that it did appear somewhat dangerous to be driving, whilst talking on the phone and trying to select the menu option to mute call - this is something that should happen automatically.
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