I think there are similar questions around, but not exactly the same problem:
I just bought a Plantronics Voyager Legend UC. Like all "UC" models, the headset comes with a small bluetooth dongle. When plugging the dongle, it immediately pairs with the headset, all fine.
When turning to the "audio devices" a new device shows up: Plantronics BT 300.
Using the PulseAudio volume control I can setup different profiles, like "analog mono output", or "analog mono duplex".
But unfortunately NO sound is reaching the headset.
Running Ubuntu 12.10 64 bit. Any idea anybody?