A 9.@ route pattern will be chosen over other 9.X patterns so when you use it, you'll have to base your dial plan around it. That basically means using route filters.
If you have a simple dial plan, using 9.@ and route filters can be an easy way to configure it. If you have lots of different gateways and physical locations, a 9.@ dial plan can be a big pain to manage and troubleshoot because you lose the ability to see exactly what is happening and specific routes.
Read the section on @ in this document. It should help.
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...