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

[Halomoan Chow]

Sorry, I'm typed wrong, not Via line but Route line :P

Regards,

Halomoan

On 9/12/07, Halomoan Chow <halomoan at gmail.com> wrote:
>
> 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
> > >
> > ------------------------------------------------------------------------
> > >
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> > > Users at openser.org
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> > >
> >
> >
>
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