Yes ... they don't look like it but the little plastic box where the separate headphone line join has a mic hole at the top and the plug has an extra ring to input the signal into the N800. They work quite well.

My only gripe with the included headset is that the wires have a very rubbery coating that seems to get tangled very easily.

That is why I hope that Bluetooth stereo headset support comes sometime soon. At the current rate, I am not holding my breath as it has sat as a feature request since the beginning of the 770.