I've been using InCall with the Nexus 4 for a while and it works well, except when using my car's bluetooth phone integration. I wonder what the magic is thoug

I've been using InCall with the Nexus 4 for a while and it works well, except when using my car's bluetooth phone integration. I wonder what the magic is though. How did they work around the problems with MediaRecorder.AudioSource.VOICE_CALL on most devices?