"Jonathan Kay [MVP]" <msnewsreplies@jonathankay.com> wrote in message
news:ubYGzjB1FHA.1264@tk2msftngp13.phx.gbl...
> Greetings,
>
> Well Messenger actually uses ports 5004 through 65535 UDP for voice/video
conversations, so
> if you're simply doing port restriction, you will have to open them all
for Messenger to
> work.
>
> As well, if the routers supported UPnP, then it would automatically open,
forward and close
> the ports are necessary when they're used.

My understanding is that it opens all these ports because it doesn't know
which port will be used. Presumably once a connection has been made it knows
which ports are in use... so does it close the other 65534 or leave them all
open until the connection is broken or you sign out of Messenger?