No Really, It Doesn't Work
Note: As of the time of this posting, the phone still does not work in that room.
Apparently the fact that everything was piled on a table in the corner didn't convince people that the phones don't work. Because a couple of days later, I went back into the room for a meeting, and it was back to normal, phones piled, cords all over the place, and a person actually trying to get the phone to work. I politely let her know it wouldn't work no matter what outlet she plugged it into. She huffed away, as if it were my fault.
My boss and I, who were meeting, decided to write on the white board that the phone don't work so stop trying. We would love to have a little camera in the corner, to see how many people seeing the note still try using the phones. Or for that matter, how many don't see the note at all.