any tips on why my handsfree bluetooth wont work please

[timshiace]

hi i have one of these new hiace vans i just got it for work, i must say i wanna buy one and convert to a camper and go they are so nice to drive. any ways i have tried severel time to connect my phone to its handsfree bluetooth system on the radio, i have had no sucess. they will pair and connect and all but if i receive or make a call i cant hear the person on the other end, they can hear me though. i have a nokia 6120c-1 if that helps, i have also deleted both connections and tryed severel times to no avail, also this may be because i havnt connected properly but when i do make a call and disconnect- the radio stays on pick up setting and if i push hang up it just stays idle and the radio wont come back on, i have to stop and kill the car and start it again to get the radio back on this isnt right eh??? ihope someone outthere can help me cheers guys