There’s a good write up from Alex Balashov on NAT, Kamailio, and the sorcerers stone.
http://www.evaristesys.com/blog/server-side-nat-traversal-with-kamailio-the-definitive-guide/ -- Fred > On Sep 28, 2020, at 9:00 PM, George Diamantopoulos <[email protected]> > wrote: > > > Received parameter is always added to via, and is part of the core sip RFC. > This is how responses are routed. > > To get nat traversal on kamailio, you generally need the following in > addition: > > - Received only handles address masquerading, for port translation you also > need to look at rport. > - A way to perform nat traversal for subsequent in dialog requests, and > additionally for initial requests involving location lookup. This is where > nathelper or similar must be involved. > - Prevent UDP Connection Tracking Timeout on NAT boxes (keeping nat alive). > This can be achieved in many ways, including configuration on NATed devices > (low registration expiration, keepalives) but it's better to employ keepalive > functionality by kamailio modules (nathelper or usrloc ka, for example). > > The actual way to perform these tasks is a bit more involved, and I'd suggest > looking at the kamailio sample configuration file which should work for most > cases. > >> On Mon, 28 Sep 2020, 19:36 Duarte Rocha, <[email protected]> wrote: >> Greetings, >> >> When NAT is detected in my Kamailio, the proxy add the parameter "received" >> to the Via header which includes the source IP. >> >> What is the mechanic or function responsible for this behaviour? Does it >> come from the NATHELPER module? >> >> Best Regards, >> _______________________________________________ >> Kamailio (SER) - Users Mailing List >> [email protected] >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users > _______________________________________________ > Kamailio (SER) - Users Mailing List > [email protected] > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
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