A system and method establish an Internet protocol (IP) connection between an originating end-system and a limited access destination end-system through a switched transport network. An originating interworking function (IWF) device inserts its switched transport network address into a data field of an RSVP path message, which is forwarded through routers in an IP network by default routing, without modifying the data field. A destination IWF device retrieves the switched transport network address from the path message, which is forwarded to the destination end-system. The destination IWF device receives a new IP address assigned to the originating end-system by the destination end-system. The destination IWF device forwards a setup message to the originating IWF device, through switches in the switched transport network, based on the switched transport network address from the path message and the newly assigned IP address. The IP connection is established in response to the setup message.