Here is one temporary fix
For the no-sound bug when calling or recieving a call, I found a fix; it was discovered by twistedddx, on XDA Dev (link to the original post: [ROM][WIP] Unofficial CM9 Port - Alpha 5 - Page 42 - xda-developers)
Works with no bluetooth for me, even if I have to do this thing everytime I call someone. (SGSII Insanity (CM9 derivate) SiyahKernel)
Quote : “Related to the “dial pad touch tones” “touch sounds” ” screen lock sound” or any other sound that is made prior to making an outbound call fixing the no call audio issue.
When your bluetooth connects make a call(no audio), eg to voicemail, bring up dialpad and press a digit(tone should be heard). End call and call again, audio will now be functional.
Any time bluetooth connects or disconnects you must force the phone to make a system sound to the ouput, eg handset or bluetooth, or you will suffer no audio bug.”
Hope it will help,