<div dir="ltr">Hi David, I already read all of these. But the problem seems contradict with what I read</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Feb 28, 2013 at 9:56 PM, David <span dir="ltr"><<a href="mailto:kamailio.org@spam.lublink.net" target="_blank">kamailio.org@spam.lublink.net</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">
<div>Hello,<br>
<br>
Look on Wikipedia and read the articles for SIP, RTP, NAT and
STUN.<br>
<br>
The answer to your question can be found in the above articles.<br>
<br>
David<div><div class="h5"><br>
<br>
On 13-02-27 10:26 PM, Khoa Pham wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:13px">Hi, I have
Kamailio as SIP server and RTP server. Client is PJSIP.</span>
<div style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:13px">
I read that STUN is for non-symmetric NAT, and RTP server is
for symmetric NAT. </div>
<div style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:13px">Supposed
A calls B.</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:13px">If A, B
both use symmetric NAT and STUN, they cannot hear each other</div>
<div style="font-family:arial,sans-serif;font-size:13px">
If A or B use non-symmetric NAT and NOT using STUN, they
cannot hear each other.</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:13px">Why is
that?</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br>
</div>
<div style="font-family:arial,sans-serif;font-size:13px">I read <a href="http://tools.ietf.org/id/draft-takeda-symmetric-nat-traversal-00.txt" target="_blank">http://tools.ietf.org/id/draft-takeda-symmetric-nat-traversal-00.txt</a> for <span style="white-space:pre-wrap">Prediction Failure, is that
related to this problem ?</span></div>
<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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</blockquote>
<br>
</div>
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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>