Would something like this work for your customer? CDR logs are externally FTP'd and processed in a SQL database (can use the free MySQL community edition). This app can run queries and send scheduled emails of custom queries as well.
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...