Hello,

for nat trversal, I suggest you use the default kamailio.cfg from later versions 3.3.x or upcoming 4.0. Read the comments at the top of the file -- practically the routing logic for nat traversal is surrounded by WITH_NAT define.

o= line is not used for rtp relaying, but some clients expect to be the same as c=, at that moment it should be rewritten (or better rewrite it always to be sure that is not the reason of some no-audio problem).

Cheers,
Daniel

On 3/1/13 12:47 PM, Khoa Pham wrote:

Hi, I mistype. What I want to know is what affects Kamailio decision in rewriting c= in SDP.

In http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf, I see that

if (isflagset(6)) {

force_rport();

fix_nated_contact();

force_rtp_proxy();

}

Which means that Kamalio only cares if the caller is behind NAT or not.

Does it care about caller's symmetric NAT, using STUN, callee's nat type ?

On Fri, Mar 1, 2013 at 10:38 AM, Khoa Pham <onmyway133@gmail.com> wrote:

Hi, I read in http://kamailio.org/docs/modules/1.4.x/nathelper.html that Kamailio might rewrite ip address in o= in SDP to facilitate NAT traversal.

It may decide to use to original IP or use IP of RTP server. What factors affect its decision ?

--
Khoa Pham
HCMC University of Science
Faculty of Information Technology

--
Khoa Pham
HCMC University of Science
Faculty of Information Technology
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