Transport
      Client                         Converter          Server

         @:C                        @:Tc|Te                @:S
          |                             |                  |
          |src:C                  dst:Tc|src:Te       dst:S|
          |-------SYN [->S:port]------->|-------SYN------->|
          |                             |                  |
          |dst:C                  src:Tc|dst:Te       src:S|
          |<---------SYN/ACK------------|<-----SYN/ACK-----|
          |                             |                  |
          |src:C                  dst:Tc|src:Te       dst:S|
          |------------ACK------------->|-------ACK------->|
          |                             |                  |
          |              ...            |    ...           |

Legend:
  Tc: IP address used by the Transport Converter on the internal
      realm.
  Te: IP address used by the Transport Converter on the external
      realm.