If you purchase the Bluetooth from the Ebay seller in Portugal ('car-sales' is the name of the website I think), then with some VCDS coding and correct wiring (Plug'n'play) you can use the BT microphone for voice control. See here for instructions.
I enabled this when I installed my BT and RNS510 and then disabled it again shortly thereafter. I much prefer using the microphone button on my steering wheen to mute/pause the music rather than talk to my car. The only time I can think of using voice control is to call someone on the phone, but since your entire phone book shows up on the MFD and is accessible via the steering wheel buttons, I don't think voice control is worth it in my case, whereas I'll use the mute button multiple times per day.
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