Arduino BT and Bluetooth headsets?

Why Arduino BT with Bluegiga WT11 module can't be linked with a bluetooth headset?

In the website of Bluegiga they say it's posible.

Then, go ahead. Are you having some problem doing it?

I want to do an aplication and i need to know if the Arduino BT will work.

I suspect that would depend, to a large extent, on what the application is. However, I suspect that the headset has something to do with it, which implies audio, which is not the Arduino's strong suit.