Use CAR to associate a device to a user for reporting purposes. Remember that a device can be associated to more than one user so when you run a report for a user, CAR needs to know which user to assign calls from a particular phone.
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...