using mattc Leo + Froyo w/Sense RC1.2
Jabra BT8040 (A2DP built-in for music) = able to answer call and talk (no more background noise on other side).
No more background noise with Wire Headset also
will try Blueant Z9 mono again tonight. Have tried it last night, but android hang, and force to close something "com.phone" thing
Updated: Jabra BT8040 doesn't seem to work anymore. I don't know why it was working perfectly for first try.
Phone: Telstra HD2 T9193
ROM: Android in Nand version
Radio Version: 18.104.22.168