[OpenSER-Users] Issue calling use_media_proxy() at on_reply_route.

Andreas Granig agranig at sipwise.com
Wed Aug 8 18:27:09 CEST 2007


modparam("usrloc", "nat_bflag", 6) # or any other free flag
...
if(lookup("location")) {
   if(isbflagset(6)) {
     # use mediaproxy if not already done
     # (make sure to not call it twice)

   }
   ...
}

Sergio Gutierrez wrote:
> 
> Hi Andreas.
> 
> Thanks for your answer. I that case, as you say, how should I setup the 
> configuration?
> 
> After doing lookup("location"), how could I check nat-flag?
> 
> Thanks a lot.
> /
> Sergio Armando Gutiérrez Betancur/
> /S//ubdirección //A//plicaciones //de //S//ervicios //C//onvergentes//  
> EPM TUNE /
> /Tel: 054 3802956/
> /Email: sergio.gutierrez at une.com.co <mailto:sergio.gutierrez at une.com.co>/
> /
> /
> 
> 
> 
> On 8/8/07, *Andreas Granig* <agranig at sipwise.com 
> <mailto:agranig at 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 at gmail.com <mailto:saguti at gmail.com> <mailto:
>     saguti at gmail.com <mailto:saguti at gmail.com>>/
>      >
>      >
>      >
>      >
>      >
>      >
>     ------------------------------------------------------------------------
>      >
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>      > Users at openser.org <mailto:Users at openser.org>
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> 
> 




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