[otrs] Limit help desk access

Hi! Is there any way to implement such configuration scenario? 1) Help desk employees and technicians can access OTRS from our Remote Desktop Server only (it can be a source IP address check) 2) Customers can access from anywhere I believe this could be achieved in two ways: 1) In user configuration, set IP address restriction (better, IMHO). If the configuration is empty, then it can Access from anywhere. 2) Customizing the code for each restricted page (which ones?), except pages customer would have access to. Has anyone tried anything similar? Any tips on how to achieve that? Thanks, -- Atenciosamente, Edson Carlos Ericksson Richter