Unfortunately I lost my old headset just before getting my TP2 and have no others to try. I can and will try the headset with my old TP1 though just to see which end has the issue, the headset or the phone. Strange how all the Stereo features for media playback work flawlessly, just can't make or receive calls. That is one major function I was after.
I have a feeling it is this crippled bluetooth stack that we have. Not only does it prevent our FM radio from functioning but it also seems to effect other features of our bluetooth chips.