Xbox 360 Crossplay with PS3/Wii #12

It would be nice to figure out how to enable crossplay for Xbox 360 and allow 360s to play with a PS3 or Wii. The current state of things here is that the game attempts to connect to a PS3 or Wii, both sides exchange some info (but not the JoinRequest packet), and then the connection attempt ceases, leaving both consoles in a sort of "half-connected" state where they occasionally ping each other to verify things are still alive. Much research needs to be done on this topic.