[OpenSIPS-Users] Force media through the Opensips server

[Adam Twardowski]

John,

The o= is the Origin IP, which doesn't really matter, the c= is the
connection IP, which is the important one.  You probably want to use
force_rtp_proxy() to rewrite the sdp and make it go through the rtpproxy,
and in your asterisk SIP peer, you can either set the peer IP to 4.5.6.7 and
have your proxy re-write the RURI to 1.2.3.4 and relay it along, or you
could set outboundproxy=4.5.6.7 in sip.conf on your sip peer and just have
opensips relay it.  You may also need to setup an on-reply route to capture
180/183 messages with SDP and rewrite the IP's in there too.

--Adam

On Fri, Aug 27, 2010 at 10:45 PM, TeleCube - John <john at telecube.com.au>wrote:

>  Hi Max,
>
> Thanks for your reply.
>
> I have rtpproxy running and I think it's all configured ok.
>
> I can use fix_nated_sdp() with flags and see the changes in the sdp lines
> in the packets.
>
> What I am struggling with is just how to go about telling the asterisk
> server and the outbound route that all traffic is to run through my proxy
>
> I'm not sure what the purpose of the o= and c= lines are and at which stage
> in the packet flow I need to re-write which lines.
>
> If anyone can offer any pointers that will be awesome.
>
> Kind regards,
> John
>
>
> Max Mühlbronner wrote:
>
>   Hello,
>
> Yes, the opensips will rewrite the sdp like you said, so it will contain
> the ip of the rtpproxy (or mediaproxy).  It can be used to proxy the rtp
> traffic to a specific destination.
>
> But the rtpproxy does not necessarily have to be the same machine as
> your Opensips. The rtpproxy is a different tool which will be enabled by
> setting the relevant modparam settings and also calling the rtpproxy in
> your routing-script.
> http://voiprookie.blogspot.com/2009/04/rtpproxy-12x-installation.html
>
> maybe there are also other, better tutorials but this link seems to be a
> good start for setting up rtpproxy with opensips.
>
>
> BR
>
> Max M.
>
>
> Am 27.08.2010 15:36, schrieb TeleCube - John:
>
>
>  Hi,
>
> I have a setup as follows:
>
> 1.2.3.4 - Outbound Route
> 4.5.6.7 - Opensips proxy
> 4.5.6.8 - Asterisk server
>
> The outbound route will only allow any traffic, signaling and media, via
> the 4.5.6.7 IP address. It cannot currently accept media from a
> different ip than the signaling.
>
> Currently the astx server sends media direct to the outbound route.
>
> Signaling is fine but I need to force the media stream from the asterisk
> server through the opensips proxy.
>
> Am I correct in expecting that nathelper/rtpproxy can do this?
>
> Is it simply a matter of re-writing the sdp detail that will tell the
> asterisk server to route media through the opensips ip address?
>
> Any examples will be greatly appreciated.
>
> Thanks,
> John
>
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