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<div class="moz-cite-prefix"><tt>Hi George,<br>
<br>
If your OpenSIPS fails to reach the UAC is because of two
reasons:<br>
- NAT pinhole is closed - but if pinging is done, it shouldn't
be<br>
- opensips is trying to contact UAC via wrong IP:port - can
you confirm that when calling the UAC, OpenSIPS sends the INVITE
to same IP and port as where the pingings are coming from ?<br>
<br>
TCP works as this part is "automatically" resolved because of
the connection (where the other pipe is known).<br>
<br>
Regards,<br>
</tt>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
On 15.10.2014 03:24, george wu wrote:<br>
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cite="mid:4dd40a9b.e54.14911311a6a.Coremail.aihuawu2012@163.com"
type="cite">
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style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><br>
<div>Hi, Bogdan-Andrei:<br>
<br>
For udp, it fails when <tt>reaching the UAC even though the
UAC keeps pinging the server all the time.<br>
<br>
For tcp, although it works. I find something interesting.<br>
Only when the client pings the server, the invite message is
sent to the UAC.<br>
In my understanding, the server should be able to send
message to the UAC since the <br>
tcp connection is open. Actually the sip server is unable to
send message to the UAC.<br>
<br>
About the firewall type, I use opensipsctl ul show/rm to
check.<br>
I find every time when it register, i get the same ip/port</tt><tt><tt>
most of time</tt>. <br>
But occasionally it might get different ip/port.<br>
I believe it is nat within a cone.<br>
<br>
I am using ice, the ice only work after the first invite
message is delivered to the peer.<br>
My ice with mediaproxy works perfectly.<br>
<br>
</tt></div>
<br>
George Wu<br>
<br>
At 2014-10-15 00:22:46, "Bogdan-Andrei Iancu"
<a class="moz-txt-link-rfc2396E" href="mailto:bogdan@opensips.org"><bogdan@opensips.org></a> wrote:<br>
<blockquote id="isReplyContent" style="PADDING-LEFT: 1ex;
MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div class="moz-cite-prefix"><tt>Hi George,<br>
<br>
NAT traversal is not only about pinging, but also about
mangling/correcting the SIP traffic (from private IPs
perspective) and ensuring the RTP flow.<br>
<br>
So you need to be sure that all 3 points are addressed.<br>
<br>
TCP versus UDP - there is only a difference at IP
transport level...like datagram versus connection, and
their implications at NAT level (being able to reach the
device behind the nat). Otherwise it;s the same.<br>
<br>
For UDP, can you see what fails ? the registration?
reaching the UAC ? <br>
<br>
Regards,<br>
</tt>
<pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
On 14.10.2014 18:37, george wu wrote:<br>
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<blockquote
cite="mid:9f50cdb.2658d.1490f4e26ee.Coremail.aihuawu2012@163.com"
type="cite">
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style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">
<div>My experience is for two uac (linphone) behind a
firewall,<br>
tcp/tls will always work.<br>
udp will never work.<br>
<br>
for both tcp/udp, my uac will send keep alive every 10
seconds.<br>
I don't understand what makes those difference.<br>
Can any one share your experience?<br>
<br>
George Wu<br>
<br>
<br>
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