Add button allows creating an inbound route. The list of destinations for the Destination Number select list is populated by the list from the Destinations tool. This list can be found by navigating to Menu -> Dial plan -> Destinations. Note: It is recommended to use Destinations tool and select where to route the call and have it build the inbound routes. There are many benefits to the destination select tool. Manually creating an inbound route is not recommended unless you need an advanced inbound route.