[SR-Users] Proxying BFCP

René Hansen rene.hansen at airtame.com
Tue Sep 15 14:57:33 CEST 2020

Hi Daniel,

I've stumbled on that one as well. It confused me a little bit, when I read
"Confirmed working", as I wasn't seeing that from my own tests. TCP cannot
connect, which I would expect as rtpengine mainly deals with UDP streams,
but when listening on incoming and outgoing UDP on the announced BFCP port,
I wasn't seeing anything outgoing. This led me to believe that the packets
were just dropped and that BFCP wasn't being proxied.

Obviously I could have made an error in my tests, but this was at least my
initial conclusion. I will check again, just to be absolutely sure.


On Tue, 15 Sep 2020 at 14:23, Daniel-Constantin Mierla <miconda at gmail.com>

> Hello,
> a quick search on rtpengine and BFCP returned a rather old issue opened on
> rtpengine project quite long time ago:
>   * https://github.com/sipwise/rtpengine/issues/80
> Not sure if the resolution was that it works relaying through rtpengine or
> just do not touch the SDP attributes related to it.
> Anyhow, I would just go ahead and test with rtpengine and see if works.
> Cheers,
> Daniel
> On 15.09.20 10:54, René Hansen wrote:
> Hi,
> I'm rather new to Kamailio and RTPEngine, so I'm looking for some help in
> locating any insights, documentation, guides or examples that resemble my
> use case.
> Currently I've got both running in working order and I can do SIP calls
> with both video and audio. Now I'm trying to figure out how to pass through
> BFCP as well. From what I understand so far, since BFCP isn't strictly RTP,
> it's not something that's outright supported. Please correct me if my
> assumption is wrong.
> My observation is that "*m=application PORT {UDP,TCP}/BFCP **" SDP lines
> doesn't seem to open for traffic as other media lines do. (Obviously
> expected if it's not supported)
> So I'm really just looking for any suggestions for, or where to start
> looking, in getting BFCP support.
> I do have the option of BFCP over both TCP and UDP, so if I could somehow
> include the originator IP as an added attribute in the re-written SDP
> answer, I could then just connect directly, around the proxy. I've yet to
> figure out how to do that as well however.
> Any pointers are much appreciated.
> Regards,
> René Hansen
> _______________________________________________
> 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
> Funding: https://www.paypal.me/dcmierla

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