When not in group meetings, remote pairing requires headsets on the in-house side. Otherwise, the voices of the partner tends to be no louder than the voices in the bullpen. Good noise rejection is pretty important in a headset.
The remote partner should keep the mute button handy. It's important when he wishes to hear all the sounds on the other side, or when the family is up and busy at home (unless he has an isolate office to work in).
I would recommend an office with a door, though I don't have one.