Headsets like BH-200 IFAIK are not yet supported.
Some code it has been already written, check here https://stage.maemo.org/svn/maemo/pr...-0osso1/audio/
and also in the new Os2008 /etc/bluetooth/audio.conf you can see that there are options for headet, pcm/hci (that is routing SCO data - which you want for Headset profile - the mono, non delayed mode that transfers data to a normal headset)

A2DP i believe uses rfcomm? so that's why is working.

But i'm pretty sure we will have Skype+headset soon in os2008