you can get the autogenerated userlist from the TCD
C:\Program Files\Cisco\CallManagerAttendant\UserLists
you can also use AXL SOAP to retrieve users,
I have created an app (sorry cannot give it away for free) which exports userID,FirstName,LastName,DN,DDI
(DDI comes from the external phone number mask on line1(DN) if the user has a device association..)
to a csv file