We have ccm with 3845 router, we do it via the router. I am not the router expert, just an fyi that it can be done that way so your users just hit dial from missed call log. i will let you know if i get command string.
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...