I've picked up an old Trixbox installation that was left half completed and I've got pretty much everything working properly. However, no matter what I do, I can't get extension 101 to behave. When it gets called, the line hangs up if the call is either answered or goes to voicemail. All the other extensions work fine, even new ones. New ones work except if I try to re-create 101. A re-created 101 has the same issues the old one did. Does anyone know how to fix this?