[SR-Users] Send 200 OK response with body to INVITE requests

[Joel Serrano]

Hi David,

As Alex said, K is a proxy. If you strictly want to use something like K,
then I would suggest yo have a look at the rtp_media_server module:

https://www.kamailio.org/docs/modules/devel/modules/rtp_media_server.html

Only available in master branch (5.3), but worth giving a try if you ask
me... It might simplify and achieve what you need.

Joel.

On Mon, Apr 15, 2019 at 12:50 PM Alex Balashov <abalashov at evaristesys.com>
wrote:

> Hi David,
>
> Kamailio is a proxy, so it cannot endogenously originate either requests
> or most replies. A 200 OK to an INVITE transaction can only come from a
> user agent (endpoint), and Kamailio's sole job is to forward it. So, the
> 200 OK is going to come from the auto-answering callee.
>
> To engage RTPEngine in both directions, you need to intercept the 200 OK
> that is generated from the callee and call rtpengine_answer() /
> rtpengine_manage() on it:
>
> ---
> route {
>    ...
>
>    if(is_method("INVITE")) {
>       ...
>
>       rtpengine_offer("...");
>
>       t_on_reply("REPLY");
>
>       if(!t_relay())
>          sl_reply_error();
>
>       exit;
>    }
>
>    ...
> }
>
> onreply_route[REPLY] {
>    if(is_method("INVITE") && sdp_content())
>       rtpengine_answer("...");
> }
> ---
>
> -- Alex
>
> On Mon, Apr 15, 2019 at 07:41:22PM +0000, David Dean wrote:
>
> > Hi all,
> > I'm building an automated load testing system for an rtp media server
> with TURN that uses Kamailio for SIP.
> > When a client sends an INVITE to Kamailio, I need Kamailio to respond
> with "200 OK" and the SDP generated by rtpengine.
> > I've enabled auto-answer in the client, so as soon as it receives the
> response from Kamailio it will start sending RTP packets.
> > Right now I'm using send_reply("200", "OK"); which is sending the right
> 200 response back to the client, but it doesn't include any body.
> > How can I get Kamailio to send a "200 OK" and add the rtpengine_answer
> into the body?
> > Appreciate any help, I've been struggling with this for three days.
> > Cheers.
> >
> > rtpengine_offer("SIP-source-address ICE=force-relay
> RTP");send_reply("200", "OK");
> >
>
> > _______________________________________________
> > Kamailio (SER) - Users Mailing List
> > sr-users at lists.kamailio.org
> > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
>
> --
> Alex Balashov | Principal | Evariste Systems LLC
>
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
>
> _______________________________________________
> Kamailio (SER) - Users Mailing List
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>
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