get the micro not into reached - bths300

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rear, I has sony vajo (bt inserted) and a bths300 of hama. the coupling functioned very well, one hears clearest audio sound. by skype however I can hear everything, but the micro does not go. if I couple headset with a a2dp-handy like the v3x, both stereo sound and telephone functions inclusive micro.
what to the devil wrong do I make??? I do not know yourself with drivers so out, therefore I ask you, me hires better to explain. best owing to for your assistance in advance! lars

edit: a hs-4w of nokia funktioiert problem-free… which I make only wrongly?