Try this.
KUFATEC GmbH - A3 - 8P & 8P Sport.Its a good idea and you must have vag com 704 for encoding gateway and rnse,also check the software version of the phone controlunit for compatability with your phone and also the firmware version of your phone.If you retro fitted the rnse and the kit supplied only had the short gps aerialbuy a shark fin which should be duel coax for nav and telephone and 4 mof coax and retrofit that lot as well and you could activate multifunction sterring well as well for the phone.(depending on the version of the dash ie highline version multifunction display