On 8/8/07, Andreas Granig <agranig@sipwise.com> wrote:

Hi,

Maybe the request of this reply hasn't been passed to mediaproxy? If the
callee is registered from behind NAT, you know that already in the
request because the nat-flag should have been set during registration.
So after lookup("location") the nat-flag should be set, and if so, you
have to use_media_proxy() also for the request.

Andreas

Sergio Gutierrez wrote:
> Hello all.
>
> We are facing some problems in our deployment of OpenSER, related to NAT
> Traversal solution using MediaProxy.
>
> In our scenario, using the the sample configuration NAT detection works
> right for REGISTER method, and for INVITE's sent from clients behind
> NAT, but, incoming calls originated from transparent clients, directed
> to clients behind NAT do not work, and do not pass through MediaProxy.
> Services based on re-INVITES do not work either.
>
> To solve that issue, we tried to intercept the 200 OK answer coming from
> NAT client, so that we could call use_media_proxy(), but, we get the
> error: "Empty Response from media_proxy()"
>
> Our configuration is more or less like this:
>
> # In the beginning of the main route
>
> if(client_nat_test("7"))
> {
>    setflag(2);
>    fix_contact();
> };
>
> .....
>
> if(is_method("INVITE"))
> {
>     if(isflagset(2))
>     {
>         use_media_proxy();
>     };
>
>     t_on_reply("1");
>
> }
>
> ....
>
> on_reply_route[1]
> {
>         if (status =~ "(18[0-3])|(2[0-9][0-9])|(1[0-9][0-9])")
>         {
>                 if (client_nat_test("3"))
>                 {
>                         fix_contact();
>                         use_media_proxy();
>                 }
>
>         }
> }
>
>
> That is a very brief configuration fragment, but it is more or less the
> schema of configuration we are using. So far, our solution to be able to
> have the whole services working is marking all the calls so that they
> pass through the mediaproxy, but we are not sure if that is a good
> solution.
>
> Thanks in advance for every hint or suggestion.
>
> Kind regards
>
> /Sergio Armando Gutiérrez Betancur/
> /S//ubdirección //A//plicaciones //de //S//ervicios //C//onvergentes//
> UNE - EPM Telecomunicaciones
> / /Tel: 054 3802956/
> /Email: saguti@gmail.com <mailto: saguti@gmail.com>/
>
>
>
>
>
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>
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