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Hello,<br>
<br>
stun works pretty well for non-symmetric nat. If there is symmetric
nat, then you need a rtp relay (e.g., rtpproxy) or turn server.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<div class="moz-cite-prefix">On 2/28/13 5:48 PM, Khoa Pham wrote:<br>
</div>
<blockquote
cite="mid:CAN+NExHSyxsTky6NH2Eakc9mhusH+v6y1k9qRjCmdU56-JG9pg@mail.gmail.com"
type="cite">
<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 moz-do-not-send="true"
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 moz-do-not-send="true"
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>
</div>
</div>
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</blockquote>
<br>
</div>
<br>
_______________________________________________<br>
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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>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla - <a class="moz-txt-link-freetext" href="http://www.asipto.com">http://www.asipto.com</a>
<a class="moz-txt-link-freetext" href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a class="moz-txt-link-freetext" href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a>
Kamailio World Conference, April 16-17, 2013, Berlin
- <a class="moz-txt-link-freetext" href="http://conference.kamailio.com">http://conference.kamailio.com</a> -</pre>
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