In Unity there is no concept of Paritions, so you have to have unique DNs for all subscribers, why not use the 5 digit extension for all subscribers and in your VM profile prefix 36 or 37?
Also, it would have been easier if you created 5 extensions in CCM and for calls within a site have a translation pattern that strips the site specific code 36 or 37, so people can call 3 digit within a site and 5 digit between sites.
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...