I'm trying to use a plantronics 855 bluetooth headset with my x220 under win7. I can pair the headset with the x220 and the headset shows up in my list of devices. I have the choice of checking audio sink, handsfree telephony, headset and remote control. Whatever I check, sound comes out of the x220's speakers rather than the headset.

Any suggestions?

Answering my own question, when I right click on the headset icon in devices and choose control, I get a panel which includes some headset configuration. Windows decided the headset had a readout, which it doesn't. I clicked on the no readout radio button and things worked.