In the current development release (3.7) Dale added support for redirector plugins. This greatly enhances flexibility of the call routing framework as it is used by the registrar. Redirector plugins are consulted in a configurable order for every cal. ENUM and ISN dialing are implemented as a redirector plugin as are all the other pre-configured dialing rules that exist in the system. New ones can easily be added by writing a new plugin. The advantage of the plugin framework is that you do not have to understand the registrar and all the related complexities. Writing a redirector plugin follows a defined API that is much easier to understand.