On 18/08/2015 14:43, Fred Posner wrote:
On 08/18/2015 08:36 AM, Jean-Marie Baran wrote:

Hi,

I am trying to have RTPproxy works with Kamailio behind a NAT. As it
seems RTPproxy cannot handle NAT natively, I installed RTPproxy 1.2.1 by
miconda: https://github.com/miconda/rtpproxy



This one is good or the new 2.0 version also supports the -A flag. You
may want to run in debug or info mode to see if you're passing packets.

Ok, that's good to know that version 2 also handle it. I did not pay attention.

Something like:

rtpproxy -A PUBLICIP -F -l PRIVATEIP -m 10000 -M 20000 -s
udp:127.0.0.1:7722 -d INFO

Making sure that the m (minimum) and M (maximum) ports match what you
have opened/forwarded on your firewall.


My question here is what should be the addresses in the SDP when
redirected from Kamailio to the client ?

Cheer,
-- 
*Jean-Marie Baran*


The address should be your public ip (for outside connections), which
should also be in the advertised statement within kamailio.

Okay, so now Kamailio receives an ACK with SDP, and replace the c=/o= fields with its public IP. Then it transmits the ACK to the client which in turn send its RTP packets to the public IP of Kamailio (that is, the router in front of Kamailio). However there is no trace of the RTP packets on the machine running Kamailio.

Because I like graphics:

Client          Kamailio          Router          Third party SIP Server
   |                |                |                      |
   |                |                |<------ACK (SDP)------|
   |                |<---ACK (SDP)---|                      |
   |<---ACK (SDP)---|                |                      |
   |                |                |                      |
   |-------RTP---------------------->|?                     |
   |                |                |                      |

    {________Private network________} {______Internet______}

The question mark denotes the fact that I lose trace of RTP packets here. Any idea why the packets are not relayed ?
 
--fred



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--
Jean-Marie Baran
AMA developer

Skype: jeanmarie.baran
Email: jean-marie.baran@ama.bzh
www.advancedmedicalapplications.com
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