Hello, I have an issue with the native backend (or rather with bluetooth) and my old Plantronics 590 headset. With my new headset (a Plantronics Backbeat Pro) everything works fine, so I think the basic setup is correct. With the Plantronics 590, the connect() call in bluez5_sco_acquire_cb returns "Protocol not supported". The headset itself is functional, I tested with my mobile. I do not even get it working with Bluez4, same error. Any idea what could be wrong? Some kernel option I am missing? Regards Georg