Hmm... Mute button or VOIP call termination? The mystery lingers.... A Google search for data on the Nokia HS-48 (this is the model that came with my N800 also) seems unhelpful. Meanwhile, Nokia mentions the HS-48 in a number of places on its websites but apparently neglected to offer specs and functionality info anywhere. Anybody in Helsinki know the answers? Hello Finland.... Come in, Finland....