No, not easily. However, if you install BAT (Bulk Administration Tool) on CallManager, it includes an Excel template file that you can use to bulk import people into CallManager -- such as phones, users, etc.
So if you just want to import user records (not phones) into the CallManager directory, then you can open your csv file in Excel, and then do some manual copying-and-pasting into the appropriate fields in the "Users" worksheet of the BAT.xlt template.
