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Question: Bluetooth call management

Hi, I have a bluetooth stereo headset for my bike helmet and use it to listen to songs while riding, however phone calls aren't working properly. with the phone set to normal or handsfree (no diference) the auto answer feature kills the music and answers the phone, however I can't hear anything but the caller hears me ok. Is their trick to get the phone call sound to transfer to the headset as this seems to be the only problem??