Ok. BT phone audio finally seems to be fixed. I have done some testing on i717 using my jabra BT earpiece and my car built in BT audio system. Seems to work flawlessly. Moose0704 tested it on Liquid/C&C as well. So here is patch, flash in recovery. Here is the source for it, its more than the CM10's patch as that was the same fix i put in yesterday and didn't work on my car built in BT. Test and leave your feedback here.
NOTE: Only for AOSP/CM10 based roms. Flash at your own RISK. Don't blame me if something goes wrong. This patch has been tested by a few and has worked for all. If the patch doesn't work, get your rom devs/compilers to compile with the patch put in.