Hugh,

Thank you for the response, however, now neither the callee or the caller are getting a feed. I am not sure if the nat requires symmetric RTP. If there is a way to determine that, please let me know.

Summery, even with Hugh's possible solution, this still does not work. 

Thank you again,

ben


On Fri, Dec 20, 2013 at 10:26 AM, Hugh Waite <hugh.waite@crocodile-rcs.com> wrote:
Hi Ben,

Some NATs require symmetric RTP, so that source and destination ports are the same for incoming and outgoing media streams. This can be configured using the 'w' flag to rtpproxy_manage in the NATDETECT route.

rtpproxy_manage("cow");

Regards,
Hugh


On 20/12/2013 16:13, Benjamin Trent wrote:
Hey all,

**I apologize if this is a duplicate, I received a bounce back on my first email.

I have kamailio set up behind a nat(port restricted, with firewall rules to allow sip transactions and allowing rtpproxy packet handling if needed) on Amazon EC2. I can register and calls complete, however, the Caller(the one initiating the transaction) receives no rtp media feed. I am running with NAT enabled on kamailio and have rtpproxy installed listening on the public IP. Kamailio and the rtpproxy are communicating(I have verified via the kamailio debug logs). If I make a call between the exact same voip machines directly via local IP on the same Nat(skipping kamailio), the calls complete and they both receive feeds.

Both the Caller(party making the call) and the Callee(party receiving the call) are behind a Port Restricted Nat. 
This is a folder containing the debug output for one of these calls and the kamailio.cfg settings


Quick FYI, the Caller Display Name and the Callee SIP UserName are the same string. However, in my understanding about sip, the display name means pretty much nothing and is just a human readable string that does not effect packet transport. If I am wrong and should test with a different display name, let me know.


Thank you for the assistance,

ben


_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users



-- 
Hugh Waite
Principal Design Engineer
Crocodile RCS Ltd.

_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users@lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users