CUCM. Allow phone registration only from specific subnet
The only way I can see of doing this would be to maintain two lists of the phones MAC addresses (i.e. list 1 contains phones with 1xxx extensions and list 2 contains phones with 2xxx extensions) and then configure your network infrastructure such that only the 1xxx phones can connect to the VLAN1 ports and only the 2xxx phones can connect to the VLAN2 ports.
802.1x with MAC Authentication Bypass as described at the link below may allow you to do this.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...