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List: sr-users
Subject: Re: [SR-Users] Cannot hear voice with symmetric NAT and STUN
From: Khoa Pham <onmyway133 () gmail ! com>
Date: 2013-02-28 16:48:02
Message-ID: CAN+NExHSyxsTky6NH2Eakc9mhusH+v6y1k9qRjCmdU56-JG9pg () mail ! gmail ! com
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Hi David, I already read all of these. But the problem seems contradict
with what I read
On Thu, Feb 28, 2013 at 9:56 PM, David <kamailio.org@spam.lublink.net>wrote:
> Hello,
>
> Look on Wikipedia and read the articles for SIP, RTP, NAT and STUN.
>
> The answer to your question can be found in the above articles.
>
> David
>
>
> On 13-02-27 10:26 PM, Khoa Pham wrote:
>
> Hi, I have Kamailio as SIP server and RTP server. Client is PJSIP.
>
> I read that STUN is for non-symmetric NAT, and RTP server is for
> symmetric NAT.
>
> Supposed A calls B.
>
> If A, B both use symmetric NAT and STUN, they cannot hear each other
> If A or B use non-symmetric NAT and NOT using STUN, they cannot hear each
> other.
>
> Why is that?
>
> I read
> http://tools.ietf.org/id/draft-takeda-symmetric-nat-traversal-00.txt for Prediction
> Failure, is that related to this problem ?
>
> --
> Khoa Pham
> HCMC University of Science
> Faculty of Information Technology
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing \
> listsr-users@lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>
>
> _______________________________________________
> 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
>
>
--
Khoa Pham
HCMC University of Science
Faculty of Information Technology
[Attachment #5 (text/html)]
<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>
</div></div><pre>_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
<a href="mailto:sr-users@lists.sip-router.org" \
target="_blank">sr-users@lists.sip-router.org</a> <a \
href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users" \
target="_blank">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</a> \
</pre> </blockquote>
<br>
</div>
<br>_______________________________________________<br>
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list<br>
<a href="mailto:sr-users@lists.sip-router.org">sr-users@lists.sip-router.org</a><br>
<a href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users" \
target="_blank">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</a><br> \
<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>
_______________________________________________
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
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