[SR-Users] kamailio as simple sip forwarder / gateway / proxy

Jurijs Ivolga jurij.ivo at gmail.com
Thu Dec 17 17:11:47 CET 2015

Hi Peter,

I created simple config for freeswitch+kamailio set-up, where everything
including registration is handled by Freeswitch(PBX) and you can try to use
it, maybe this is what you need.


I never tested in in prod, so use it on your own risk.

With kind regards,


2015-12-17 17:36 GMT+02:00 Peter Gervai <grinapo at gmail.com>:

> Hello,
> I've been browsing the net and the (not so friendly) documentation but
> found no readily available solution.
> I have tried to fabricate on myself but it seems it's not that easy
> without getting deeply familarised with
> SIP protocol internals which I don't quite want know.
> The problem seems simple enough, maybe you can easily tell the solution.
> There is kamailio at ip It's task is to accept
> connections from SIP clients
> and forward them to PBX at, and accept PBX packets and
> forward them to the
> clients.  PBX handles registration, options, invites, everything.
> Kamailio does not authenticate, authorise, just forwards everything
> back and forth, like a mindless proxy.
> No NAT involved.
> [The reason is that K. have to call external scripts whenever an
> outbound call (towards the clients) is
> initiated, which the PBX is unable to. Please don't advise other
> solutions (which isn't able to call executables
> in-session).]
> I have created a simplistic config which is not expected to work and
> it doesn't quite (plenty of security stuff left out now):
> route {
>  if(src_ip==myself) {
>    add_path();
>    $du="sip:";
>  } else {
>   if(src_ip!="") {
>     $du="sip:";
>   } else { #from gateway pkts aren't changed
>   }
>   if(!t_relay()) {
>     sl_reply_error();
>     break;
>   }
> }
> There is several possible problems, but it seems Contact: is one main
> one since it contains the client instead of
> the proxy. Possibly this may even be the almost-good solution.
> I'm sure there's an easy and pretty solution so before I start to make
> ugly ones I ask the wise people.
> Thanks,
> Peter
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