On Thu, Mar 18, 2010 at 01:28:34PM +0000, My Name wrote: > Indeed, this requires explanation. This is surely the job of the SIP server. > I certainly do not need a separate STUN server to use a Web browser. The > Web site has no trouble determining my external IP address.
That is because there are only two parties involved: you contact the web server which thus has your "call back" IP/port which has been opened on the NAT as part of setting up the connection. But in sip voip, the sip server only "introduces" the two ends of a call: the actual call packets go directly rather than via the server. Thus in effect the server introduces a 3rd party. There has to be a mechanism to get that 3rd party traffic through the NAT: hence STUN. Otherwise any "3rd party" spam etc. would get through. Above is a very simplistic explanation, but I hope captures the essence. ael _______________________________________________ ekiga-list mailing list ekiga-list@gnome.org http://mail.gnome.org/mailman/listinfo/ekiga-list
