Currently with the shipping versions of CUCM 8.X presence is very limited as you can only see couple of states with dedicated BLF buttons, not very scalable. You still need presence engine such as CUPS server to make it true presence solution with ability to federate to other solutions/companies, etc.
Hosted Webex solution is another alternative if you do not want on premise CUPS server.
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...