CIUS probably works on CUCM 7.1.5, however, it cannot make a video call to a CTS endpoint unless the CTS is running at least 1.7.4 and CUCM is running at least 8.5. Otherwise, the CTS endpoint will only negioate a TIP call.
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...