My situation is as follows:
*First off, this is based on my own experience to date using my iPhone 5 in my car (Lexus LS460).
*BT music streaming from iPhone 5 to my car's audio system works fine.
*I can make calls via BT in the car as long as I manually dial it on the phone.
*Can make calls via BT if I use the car's voice command system as well.
*Everything seems to work through the BT interface, EXCEPT, I can no longer use Siri to dial phone calls. It automatically "disconnects" the instant that it tries to initiate the call. Used to love this feature as it provided a truly hands free solution. Also, in my opinion, Siri provides a superior voice recognition system.
For the record, I'm using IOS 7.0.6, latest available, to my knowledge. We also tried my wife's iPhone 5 (same software) to no avail...same results.
REALLY LOOKING FORWARD TO A QUICK RESOLUTION FROM APPLE. THIS APPEARS TO BE AN EASY COMPATIBILITY ISSUE.