We have several buildings and each building has a separate voice VLAN. When we move a phone from one building to another, it will not update with a new IP address. I don't think it's a DHCP problem, new phones register just fine. I can even take a new phone put that MAC in Callmanager on the old profile and the new phone will work correctly for the number.
I have tried a hard reset on the phones (this is happening to various models 7911, 7941G-GE, 7941G, 7961G-GE). The phones show they are updating, then go back to their original IP which will not work in the building they've been moved to.
When the phone is in this state I can't access the settings to change it to a static IP but if I take the phone back to the building it is from it will work just fine and I can access the settings button there.
I don't believe it's a VLAN problem, since the other phones all work just fine and new ones will register without an issue.
Our deployment is fairly new so I don't actually recall if we have moved any phones successfully previously.
Thanks for any help.
It almost surely is a problem with the DHCP server. We were experiencing these exact issues and spent many hours trying to troubleshoot them to no avail. The symptoms sound identical.