And by the way Miro the personal headsed is not connected via Bluetooth.It is wire connected.
If the personal headset would work via Bluetooth you would never see my name here.Let me explain again something.The MB version in question here will not let you make calls directly.You have to buy extra gadget (the headset interface),connect the gadget to the connector (wire,no BT) and then if you are lucky you may make calls.Your phone connects over the BT to the gadget (headset) and from there the call goes via the wires to COMAND and thus to car speakers and vice versa from car microphone to COMAND then to the gadget (the headset interface) and from there over the Bluetooth to your phone.
That's why it is so unreliable.
Hey,I love my Mercedes as you do but this bothers me.