My Plantronics 260 works great with N900, but the well-known problem with the few numbers of profiles mean also that when you connect a pair Bluetooth-earphones you can´t hear neither ring - or the message signals. It is no problems when you listens on music, but when you ”only” has them connected so…
By the way so is it also problems when you listen to music, for the message signal is only one blipp.