That should not be a problem. If you are doing Nat I believe that the firewall has to support H.323? What are they using for a firewall? If you are using h.323 then you will need to open 1719 and 1720. If you are doing MGCP the ports are 2427 (MGCP listen port) and 2428 (MGCP keep alive port). If you are going to have audio go through the firewall then you will need to open 16384-32767.
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...