The problem is you have the older VCM voice compression modules rather than the HCM High Density compression modules. Only the HCM's support the h245 dtmf relay command , it's something to do with DSP horsepower. The VCM can only do cisco-rtp.
Please upgrade to ISR, we dont support that anymore.
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...