The only way that the system can have remote administration access is if it is equipped with an optional modem card. It is located in the far lower-right slot in the cabinet and is only about 2" tall. If it is not there, then there's no way to make programming changes to the system remotely.

If there's a voice mail card in the far left slot, then it is possible to make changes remotely (to the voice mail only) via touch tone commands.

Shutting down the system and pulling these cards out will assure you that it can't be altered remotely. Use caution in doing this because it is possible that the system's memory retention battery is bad and shutting it down may cause the system's database to be lost.

I'm curious about one thing: Why do you feel the need to replace a perfectly good system with VoIP? Do you need that for some reason?

Ed Vaughn, MBSWWYPBX