[SR-Users] How to get the audio codec used for each established call.

[Abdoul Osséni]

Hello Daniel-Constantin,

Thank you for your response.

When I try that:

if (is_method("INVITE") && status == 200) {
$var(s) = " ";
$var(codec) = $(rb{line.sw,a=rtpmap}{s.select,1,$var(s)});
}


 0(18567) CRITICAL: <core> [core/mem/q_malloc.c:514]: qm_free(): BUG:
freeing already freed pointer (0x7fb9a0606010), called from core:
core/pvapi.c: tr_param_free(1833), first free pv: pv_trans.c:
tr_parse_string(2425) - ignoring
 0(18567) ERROR: <core> [core/pvapi.c:1105]: pv_parse_spec2(): bad tr in
pvar name "rb"
 0(18567) ERROR: <core> [core/pvapi.c:1131]: pv_parse_spec2(): invalid
parsing in [$(rb{line.sw,a=rtpmap}{s.select,1,$var(s)})] at (4)
 0(18567) CRITICAL: <core> [core/cfg.y:3537]: yyerror_at(): parse error in
config file /usr/local/etc/kamailio/kamailio.cfg, line 840, column 17-59:
Can't get from cache: $(rb{line.sw,a=rtpmap}{s.select,1,$var(s)})
ERROR: bad config file (1 errors)
 0(18567) INFO: <core> [core/sctp_core.c:53]: sctp_core_destroy(): SCTP API
not initialized

But with the following code, I have no issue
if (is_method("INVITE") && status == 200) {
$var(codec) = $(rb{line.sw,a=rtpmap}{s.select,1, });
}

Abdoul OSSENI


Le ven. 22 nov. 2019 à 11:56, Daniel-Constantin Mierla <miconda at gmail.com>
a écrit :

> Hello,
>
> there can be many codecs that are selected/offered via SDP, the one
> actually used can be seen in the RTP headers, but Kamailio doesn't relay
> RTP itself.
>
> If you know that in your deployment there is going to be only one codec
> selected via sdp, then the right place is to take it from the SDP of 200ok,
> when the INVITE request has SDP, or from ACK SDP if the 200ok was the first
> with SDP. It is in the media (m=) line, which has the format:
>
> m=<media> <port> <transport> <format list>
>
> For example
>
> m=audio 11424 RTP/AVP 8 101
>
> The the next line should give the first codec id:
>
> $(rb{line.sw,m=}{s.select,3, })
>
> Note that there is a space after '3,'. If doesnt work, try:
>
> $var(s) = " ";
>
> $(rb{line.sw,m=}{s.select,3,$var(s)})
>
> Read more about used transformations at:
>
>   * https://www.kamailio.org/wiki/cookbooks/5.3.x/transformations
>
> However, you may need to do further processing if you want the name of the
> codec, specially for those that have dynamic id, so you need to find the
> mapping in the a=rtpmap line.
>
> You can use embedded scripting (lua, python, javascript, ... see the
> app_NAME modules) to parse the body ($rb variable) and extract what you
> want from there, then set back in an variable (recommended $avp() or
> $xavp()) that you set to extra accounting parameter of acc module.
>
> Cheers,
> Daniel
> On 22.11.19 11:12, Abdoul Osséni wrote:
>
> Hello all,
>
> I try to save in the CDR the audio codec used for each established call.
>
> Can you help me?
>
> Regards
>
> Abdoul.I
>
> _______________________________________________
> Kamailio (SER) - Users Mailing Listsr-users at lists.kamailio.orghttps://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
> --
> Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
> Kamailio World Conference - April 27-29, 2020, in Berlin -- www.kamailioworld.com
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20191122/f87a95b6/attachment.html>