MStepan,
So, let's step through this a little at a time and see if we can't figure out where the boggle is.
When you start up the phone hold down keys 7 & 8 at the same time and go into its configuration; just like you have been doing.
List all the settings that you have in the phone and what they are set for. For IP Address just put something like LAN IP, Public IP, or System IP depending on what it is.
Thanks,
TE