[~powerpbx]
If we 'Call Debug' is enabling astpp log which is resides in /var/log/astpp and it has the details for queries and its response which are firing during the dialplan. The astpp.lua is enabling the log of freeswitch channel variables, which is too much technical in terms of freeswitch but if you are technically knowledgeable enough then you can manually change that flag's value and have the logs But not good idea to enable it by default because that will increase the disk space as well.