<div dir="ltr">@Daniel<div><br></div><div style>Thanks for reply. But do you know what affects Kamailio in deciding whether to rewrite c= or not ?</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Mar 3, 2013 at 11:42 PM, Daniel-Constantin Mierla <span dir="ltr"><<a href="mailto:miconda@gmail.com" target="_blank">miconda@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Hello,<br>
<br>
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.<br>
<br>
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).<br>
<br>
Cheers,<br>
Daniel<div><div class="h5"><br>
<br>
<div>On 3/1/13 12:47 PM, Khoa Pham wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">Hi, I mistype. What I want to know is what affects
Kamailio decision in rewriting c= in SDP.
<div><br>
</div>
<div>In <a href="http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf" target="_blank">http://kamailio.org/docs/ser-getting-started/SER-GettingStarted.pdf</a>,
I see that </div>
<div><br>
</div>
<div>
<div> if (isflagset(6)) {</div>
<div> force_rport();</div>
<div> fix_nated_contact();</div>
<div> force_rtp_proxy();</div>
<div> }</div>
<div><br>
</div>
<div>Which means that Kamalio only cares if the
caller is behind NAT or not.</div>
<div><br>
</div>
<div>Does it care about caller's symmetric NAT, using
STUN, callee's nat type ?</div>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Fri, Mar 1, 2013 at 10:38 AM, Khoa
Pham <span dir="ltr"><<a href="mailto:onmyway133@gmail.com" target="_blank">onmyway133@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi, I read in <a href="http://kamailio.org/docs/modules/1.4.x/nathelper.html" target="_blank">http://kamailio.org/docs/modules/1.4.x/nathelper.html</a>
that Kamailio might rewrite ip address in o= in SDP to
facilitate NAT traversal.
<div>
<br>
</div>
<div>It may decide to use to original IP or use IP of RTP
server. What factors affect its decision ?<span><font color="#888888"><br clear="all">
<div><br>
</div>
-- <br>
<span>Khoa Pham</span><br>
<span>HCMC University of Science</span><br>
<span>Faculty of Information Technology</span><br>
</font></span></div>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
<span style>Khoa Pham</span><br style>
<span style>HCMC University of Science</span><br style>
<span style>Faculty of Information Technology</span><br>
</div>
<br>
<fieldset></fieldset>
<br>
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<br>
<pre cols="72">--
Daniel-Constantin Mierla - <a href="http://www.asipto.com" target="_blank">http://www.asipto.com</a>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><span style="color:rgb(0,0,0)">Khoa Pham</span><br style="color:rgb(0,0,0)"><span style="color:rgb(0,0,0)">HCMC University of Science</span><br style="color:rgb(0,0,0)">
<span style="color:rgb(0,0,0)">Faculty of Information Technology</span><br>
</div>