As you probably know, you revert to DC Directory by rerunning the Customer Directory Integration plugin and choosing to uninstall.
You will have to manually recreate all the users in DC Directory. You MAY be able to save some time using BAT (the Batch Administration Tool) to import users. You can formulate a CSV file to import and do it all at once. Furthermore, the Active Directory Users & Computers MMC is capable of exporting some user data to a CSV file. This won't get your passwords back, but with some massaging of the CSV file, you may be able to save yourself some typing if you have a lot of users.
You're not really intended to add and remove users from CallManager when integrated with Active Directory. The advantage to integrating with AD is that the company should already have AD accounts for all their users. The users are then given the benefits of one login name and one password to remember. The administrators get the benefit of managing the addition and removal of users, convenient modification of their directory attributes using several familiar tools, password expiration, one-stop removal of the user account if they leave the company, etc etc. The sum of it is you're not supposed to use AD as just another DC Directory; the premise is that the data is already there and you should integrate smoothly with it. If the data isn't already there, it is a waste of your time to use anything other than DC Directory.
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...