Made for iPhone hearing aids and automatic audio routing in iOS 9
The audio routing feature of iOS 9 is awesome. I really like having ringtones automatically route to my hearing aids. However, there seems to be an incorrect prioritization with the head unit in my car. The head unit supports hands free bluetooth call handling, but requires a USB connection for audio streaming (I have to connect my phone to the USB to listen to music, but phone calls are handled over bluetooth).
Prior to iOS 9, my iPhone would prioritize the head unit in my car whenever the USB port was plugged in. With iOS 9, my phone prioritizes my hearing aids. When I plug phone into the head unit's USB port, I have to use airplay to route the audio stream to the car's head unit. Moreover, this doesn't seem to be sticky -- when I advance a song using the control on the head unit, audio streaming switches back to my hearing aids.
Yesterday, when I received a call in my car, the call started on the car's head unit, but switched to my hearing aids in the middle of the call. This wouldn't be a problem except that this also switches the microphone to the phone which doesn't pick up my voice the car.
Has anyone else had similar problems?
More specifics:
I have an iPhone 6s running iOS 9.0.2. I have both Call Audio and Media Audio Routing set to "Automatic" (Settings -> General -> Accessibility -> Hearing Aids -> Audio Routing).
The head unit in my car is a Pioneer DEH-P6300BT.
Thanks for any suggestions you can offer.