All tried out so far (ultimately paid) programs for subsequent adding this feature fail because the respective program either no hot key to start the voice control at X2 can or that pressing the call button on the (cable or Bluetooth) headset instead be assigned To start the voice control is the virtual Telefontastur fades on the display and there waiting for input. Active call via headset without taking the X2 into their own hands, so it is not possible. Only with a preinstalled FORD Bluetooth control I have succeeded in the car to send voice commands also the active call to the X2.
I do not want to spend hours on end in various forums, perhaps to bring through registry manipulation a function to work, which was already at the P1i course actually.