Will the ISP's allow inbound connections to these NATted addresses?
If not, that is yet another problem to solve.
...
> Unfortunately, it seems that current s2s protocols will not work with>
> servers behind NAT.> > Additionally, there is a potential core problem
> related to XMPP server> names. If ISPs provided schools with the ability to
> request permanent...
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Use video conversation to talk face-to-face with Windows Live Messenger.
http://www.windowslive.com/messenger/connect_your_way.html?ocid=TXT_TAGLM_WL_Refresh_messenger_video_042008