Never heard of "Hard Phones". ART is designed to handle calls placed from Skinny devices that Call Manager knows about. As long as Call Manager is involved in the call, a record will be created in CDR, and that call record should be passed over to ART. Phones or faxes off a WS-X6624-FXS, or some other MGCP gateway should be able to show in ART reports.
Some pointers on ART itself:
Remember to enable CDR on the Call Manager
ART is centered around the relationship between a phone device and a user, so make sure the device is associated to one and only one user.
Be careful of Modifications, Additions and Changes--disassociate a user and the device FIRST, then delete an inactive user or defective phone.
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...