As in my previous thread I have never worked on a Panasonic system I am trying to attach the VM to the unit and program it. I know I need to go into Program #117 to set the port. The current setting is MASTER 01> 02 and when I try to assign port 16 (which I believe is extension 16) the setting just reverts back to 02. How do you save settings and is this Port that Im trying to set the correct one. I assume that port 02 is for extension 102 because that one is not being used. I inherited this system so I don't know why or how these are set. Any help would be greatly appreciated. I am in the process of getting a manual.