Fax Routing Extension Registration
Each fax routing extension must register with the fax service during installation to provide information about the extension and its fax routing methods. A fax routing extension can only be installed directly on a fax server (local installation).
Only an administrator can register or unregister a routing extension. Registration and unregistration will only take place after you restart the fax service.
To register a fax routing extension locally with the fax service, use the IFaxServer::RegisterInboundRoutingExtension method. To unregister a fax routing extensions, use the IFaxServer::UnregisterInboundRoutingExtension method.