I think you have that statement backwards.... caller ID is only supported on FXO ports if you are using H323, not MGCP. So it depends on your deployment.
can two seperate Call Managers register to the same MGCP gateway?
An MGCP will only register to 1 CCM at a time. You can however setup several more call managers as redundant-hosts. The Call Manager you want it to register to will be setup as the call agent. After this is setup, a show mgcp command will show the primary as registered, and the secondary as "backup ready" If the primary fails, the MGCP GW will failover to the backup.
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...