The source of the username when the ccDetailsLoginType object has a value of 'userdb', 'radius', 'tacacs' or
'all'. The value 'none' means no username is defined. The value 'cli' means take the username from the
calling number information in the SETUP message. The value 'calledsub' means take the username from the called
subaddress information in the SETUP message. The value 'useruser' means take the username from the user-user
information in the SETUP message. The value 'callname' means take the username from the call details entry name.