[OpenSER-Users] record_route_preset("x.x.x.x:5060; nat=yes"); and search("^Route:.*; nat=yes")

[Halomoan Chow]

I copy and paste the logic example generated from sipwise below.
I can see for first request, it marked the sender is behind nat with
record_route(";nat=yes")

In the loose route block, it tries to identify sender if they are behind nat
with search("^Route:.*;nat=yes").

In one sip proxy architecture, after you enter loose_route() function, the
Via with ;nat has gone, right? and the search("^Route:.*;nat=yes") test
would always return false.
Please correct me if i'm wrong. Thank you.


        if(!is_method("REGISTER"))
        {
                if(nat_uac_test("19"))
                {
                        record_route(";nat=yes");
                }
                else
                {
                        record_route();
                }
        }
        if(is_method("CANCEL") || is_method("BYE"))
        {
                end_media_session();
        }

        if(loose_route())
        {
                if(!has_totag())
                {

                        xlog("L_INFO", "Initial loose-routing rejected -
M=$rm RURI=$ru F=$fu T=$tu IP=$si ID=$ci\n");
                        sl_send_reply("403", "Initial Loose-Routing
Rejected");
                        exit;
                }
                if(nat_uac_test("19") || search("^Route:.*;nat=yes"))
                {
                        fix_nated_contact();
                        setbflag(6);
                }

                route(3);
        }


On 9/12/07, Bogdan-Andrei Iancu <bogdan at voice-system.ro> wrote:
>
> Hi Halomoan,
>
> Mainly because the NAT detection on SIP replied is very poor - you can
> check only if the contact address is a private one or not. The other nat
> test are not applicable for replies (but only for requests).
>
> Anthow, when you process the request, you learn that the calee is behind
> NAT, so you can simple remember this (in RR) than detecting it each time
> when receiving a reply.
>
> regards,
> bogdan
>
> Halomoan Chow wrote:
> > Dear All
> >
> > I don't understand why in the Openser+MediaProxy i need
> > record_route_preset("x.x.x.x:5060;nat=yes"); and
> > search("^Route:.*;nat=yes")
> > What is the purpose while I can do client_nat_test to see if the
> > request is come from a nat-ed client.
> >
> > If I remove search("^Route:.*;nat=yes") from below statement, I can do
> > re-INVITE without any problem because it still have client_nat_test to
> > find out the nat in between.
> >
> > if (client_nat_test("3") || search("^Route:.*;nat=yes")) {
> >    setbflag(6);
> >    use_media_proxy();
> > };
> >
> >
> > Hope someone can give me a clue.
> >
> > Thank you.
> >
> > Regards,
> >
> > Halomoan
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Users mailing list
> > Users at openser.org
> > http://openser.org/cgi-bin/mailman/listinfo/users
> >
>
>
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