I had the coding looked at as my RNS510 was retro fitted. We (for some reason) couldnt get into one of the control modules to get all the steering buttons to work.
The sat nav does come up on the mfd, as does track names etc. We tried to change the settings to tell the CPU that the VW phone was fitted but it wasnt having any of it. tbh i prefer to just use the touch screen to answer calls, but can understand your concern.