Forced Authorization Codes (FAC) allow you to manage call access and accounting. This feature regulates the types of calls that certain users can place, forcing the user to enter a valid authorization code before the call completes.
The FAC feature requires that you make changes to route patterns and update your dial plan documents to reflect that you enabled or disabled FAC for each route pattern. You can access the Forced Authorization Code search and configuration windows from Call Routing > Forced Authorization Codes, in Cisco CallManager Administration.