hi all... need help here..

i have a bluetooth headset Sony erricson HBH DS970. i allready pair with my HTC Touch HD and success.
i'm able to listen music with this bluetooth.
the problem is when i use it for make a call i'm unable to talk and hear a voice. is there any problem with my Blackstone bluetooth? or there's any software i must install on my PPC? anyone can help me?

thank you.