Yes, option code 512 (COMAND) comes with Linguatronic on the W212.
With it, you can use voice commands to select a function (navigation, radio, disc, telephone, etc) and also to control a selected function, e.g. Dial Name or Dial Number, etc with the phone, Next Station / Previous Station, etc with the radio, Next Track, Previous Track, Track Number etc, with the Disc or memory card player, Start / Stop navigation, enter a destination, etc. I confess that while it sounds as though it's just a geeky gadget, I've found it to be pretty useful in some circumstances. It recognises most commands I speak pretty reliably even though it's trained to recognise my wife's voice (it's in her SLK, not my W204), but is better at recognising her commands - as I'd expect.