If I’m not mistake, Sony PCS Endpoint supports 1721 signaling port to improve interop between GnuGK (GnuGK default port is 1721 but also support 1720), but not to be flexible for standard H.323 call signal (H.225 standard signal is 1720).
I’m not aware any other gatekeeper other than GnuGK which support 1721 for H.225/RAS communication.
GnuGK does support 1720/1721 in parallel (unless I miss understand their implementation), however this is not standard port for H.323 call signaling.
Therefore I strongly recommend staying with 1720 for H.225 signaling port to ensure there is no unexpected behavior in later phase (typically this type of deployment cause problem in future extension).
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...