After your message I noticed when I switched from CarPlay to Uconnect that the stereo defaulted to the AUX. I tried playing sound from my phone and it worked. I have not tried a phone call yet but believe that it will work also. What issues are you trying to resolve? It is 110% better than Navtool, ENG-Custom is supporting their product. ENG-Custom could do a better with the manual, like everyone else it is lacking.
Jim