Well... some aftermarket solutions tap into the steering wheel controls, it might be possible to use one of them (I know Parrot products have been installed in Audis).
Such as this:
Parrot
http://www.parrot.com/catalogue/catalog/products/parrot-multican/#top
You could always retrofit Bluetooth to get phone and thus voice control for the phone. The instructions below are for MOST/full MMI cars (2G, not 3G), but many basics are similar for Concert/Symphony radio if you have that, so you get some feel to what is involved, only thing different is that with Concert/Symphony there are no optical cables to wire, just different kind of CAN/K-line wiring... contact Kufatec.de for a kit.
I have not heard of any solution (VAG COM or otherwise) to reprogram the speech button to do some other in-car function, though.
Bluetooth phone prep and speech dialogue system retrofit Audi A6 (4F/C6) Avant MMI High (possibly relevant also for Q7/A8)
http://www.geocities.com/a6retrofit/articles/a6phoneprep.html
Notes on alternative (easier) retrofitting of phone prep in glove compartment Audi A6 (4F/C6)
http://www.geocities.com/a6retrofit/articles/a6gloveprep.html
Such as this:
Parrot
http://www.parrot.com/catalogue/catalog/products/parrot-multican/#top
You could always retrofit Bluetooth to get phone and thus voice control for the phone. The instructions below are for MOST/full MMI cars (2G, not 3G), but many basics are similar for Concert/Symphony radio if you have that, so you get some feel to what is involved, only thing different is that with Concert/Symphony there are no optical cables to wire, just different kind of CAN/K-line wiring... contact Kufatec.de for a kit.
I have not heard of any solution (VAG COM or otherwise) to reprogram the speech button to do some other in-car function, though.
Bluetooth phone prep and speech dialogue system retrofit Audi A6 (4F/C6) Avant MMI High (possibly relevant also for Q7/A8)
http://www.geocities.com/a6retrofit/articles/a6phoneprep.html
Notes on alternative (easier) retrofitting of phone prep in glove compartment Audi A6 (4F/C6)
http://www.geocities.com/a6retrofit/articles/a6gloveprep.html
