I've not used Skype so I can't say, but anyone who's used an XBox console online knows about the port forwarding nightmares you have to go through to make the t

I've not used Skype so I can't say, but anyone who's used an XBox console online knows about the port forwarding nightmares you have to go through to make the things work correctly. UPnP was the only way to make 2 consoles work at the same time.