I just worked on this today in CUCM 6.0. The new Ringlist.xml did not work because I named it RingList.xml. Once I renamed the file with the lower case "L" and uploaded it, the new ring tones were available.
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...