RPORT parameter     ==  RPORT={tcp|udp}[:host]
                    --  default: none

This parameter should be used together with MASTER parameter. If specified, a connection (for response data transfer) from the MASTER-DeleGate to this DeleGate is established separately from the connection (for request data transfer) from the DeleGate to its MASTER-DeleGate. A specified type of response connection will be made from the MASTER toward the delegate at the specified host.