[SR-Users] mediaproxy-ng query

[Alex Balashov]

I think I might have just answered my own question:

 From 
http://kamailio.org/docs/modules/4.1.x/modules/rtpproxy-ng.html#rtpproxy-ng.f.rtpproxy_offer:

---

r - flags that IP address in SDP should be trusted. Without this flag, 
rtpproxy ignores address in the SDP and uses source address of the SIP 
message as media address which is passed to the RTP proxy.

---

Still, any elaboration welcome.

On 06/07/2014 12:39 PM, Alex Balashov wrote:

> Hello,
>
> I'm invoking mediaproxy-ng with rtpproxy_offer/answer("ow") and am
> getting a scenario where:
>
> INVITE is forwarded to signalling gateway xxx.xxx.xxx.xxx, which returns
> an SDP answer of yyy.yyy.yyy.yyy:51964. rtpproxy is invoked in both
> directions. However, media forwarded from media endpoint A is sent to
> xxx.xxx.xxx.xxx:51964 (the correct port, but to the signalling gateway),
> rather than yyy.yyy.yyy.yyy:51964, which is what's specified in the SDP
> answer in the 200 OK from xxx.xxx.xxx.xxx.
>
> No media is coming back to mediaproxy-ng from yyy.yyy.yyy.yyy:51964. The
> cause of this is a separate and logically unrelated issue. Nevertheless,
> I am curious as to why mediaproxy-ng doesn't send media from the near
> end to yyy.yyy.yyy.yyy:51964--in other words, to the specified SDP
> endpoint on the far end, rather than to the signalling gateway.
>
> I initially imagined that this might be due to the "w" option to
> rtpproxy_offer(), which the documentation says forces symmetric RTP.
> However, this behaviour is not elaborated upon or defined. I tried
> removing the 'w' option but seem to be getting the same result.
>
> Is this a default behaviour of COMEDIA-style source port latching? In
> other words, does mediaproxy-ng need to latch onto incoming RTP from
> yyy.yyy.yyy.yyy:51964 before it will send media there, as opposed to the
> signalling gateway? If so, is there any way this behaviour can be
> disabled, so that mediaproxy-ng simply follows SDP in all cases?
>
> Thanks,
>


-- 
Alex Balashov - Principal
Evariste Systems LLC
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/

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