PVDMs perform tasks such as transcoding and conferencing. i.e. converting from digitial codec to analogue, analogue to digital or from digital to a different codec and multiplexing voice calls together. With this in mind, you should not need PVDMs to terminate a SIP trunk using the same codec inbound and outbound, however if your SIP ITSP uses a different codec than you use internally then I can see you requiring them.
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...