I have a few 7912 that I used to use in a sip environnement with asterisk(lab environnment only). I want to convert these sip phone to sccp to be able to use them with CME. The CME router is running cme 4.0 and Cisco ip communicator is working fine on it. What is the process to convert these phones to sccp? Do I need to do this via the cme with a particular command? Can I reset these 7912 to factory default?