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<p>Hello</p>
<p>I got an answer from the VOIP provider.</p>
<p>They claim that we have an error in our port forwarding. Because
we advertise 5071, but traffic comes from another port. <br>
</p>
<p>As I understand, it is however impossible for TCP to send all
traffic from just one port.</p>
<p>How is TCP SIP actually supposed to handle a BYE, when the client
is behind NAT.<br>
</p>
<pre class="moz-signature" cols="72">-------------------- Med Liberalistiske Hilsner ----------------------
Civilingeniør, Kjeld Flarup - Mit sind er mere åbent end min tegnebog
Sofienlundvej 6B, 7560 Hjerm, Tlf: 40 29 41 49
Den ikke akademiske hjemmeside for liberalismen - <a class="moz-txt-link-abbreviated" href="http://www.liberalismen.dk">www.liberalismen.dk</a></pre>
<div class="moz-cite-prefix">On 11/4/20 10:00 PM, Kjeld Flarup
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:27523802-7afa-2dc4-5268-edf0025860da@liberalismen.dk">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Hello again</p>
<p>I have attached a Capture.</p>
<p>My public IP is 194.255.22.44, and I have a port forward of
5071 in my router</p>
<p>The Raspberry Pi running the Kamailio is on 192.168.2.9 with an
alias 192.168.2.40</p>
<p>My listening is setup like this<br>
</p>
<p>listen=127.0.0.1:5071<br>
listen=eth0:5071 advertise 194.255.22.44:5071<br>
alias=194.255.22.44:5071<br>
</p>
<p>Kamailio is forwarding an invite from a door phone thus I also
rewrite FROM:</p>
<p>uac_replace_from("sip:"+$dbr(ra=>[0,1])+"@194.255.22.44:5071");<br>
And the failure route to<br>
$fu = "sip:"+$dbr(ra=>[0,0])+"@194.255.22.44:5071";<br>
<br>
</p>
<p>In the route doing the INVITE I also set this:<br>
</p>
<p>set_advertised_address("194.255.22.44:5071");<br>
</p>
<p><br>
</p>
<p>Regarding tcp_reuse_port, if I set this I get this error, which
I understand is due to the way TCP works.<br>
</p>
<p>Nov 4 18:38:41 scantronpbx /usr/sbin/kamailio[15864]: {1 ACK
16191 ACK C2Az-Xm2b0CEPyV5eQuz7yEf9IJo4PyJ} WARNING:
<core> [core/tcp_main.c:1061]: tcp_do_connect(): binding
to source address 192.168.2.40:5071 failed: Address already in
use [98]</p>
<p>I do have tcp_reuse_port=yes with this capture. But much to my
surprise, the 200 OK from is send to 37148, but the ACK to it
comes from 37150<br>
</p>
<p><br>
</p>
<pre class="moz-signature" cols="72">-------------------- Med Liberalistiske Hilsner ----------------------
Civilingeniør, Kjeld Flarup - Mit sind er mere åbent end min tegnebog
Sofienlundvej 6B, 7560 Hjerm, Tlf: 40 29 41 49
Den ikke akademiske hjemmeside for liberalismen - <a class="moz-txt-link-abbreviated" href="http://www.liberalismen.dk" moz-do-not-send="true">www.liberalismen.dk</a></pre>
<div class="moz-cite-prefix">On 11/4/20 1:59 PM, Carsten Bock
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAOCjumHCpV1JxoW+wS6pT4V3YKcYziJ=9eqEbpnKO3kvZZBOXg@mail.gmail.com">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<div dir="ltr">Hi,
<div><br>
</div>
<div>I think you are searching for this parameter:</div>
<div><br>
</div>
<div><a
href="http://www.kamailio.org/wiki/cookbooks/devel/core#tcp_reuse_port"
moz-do-not-send="true">http://www.kamailio.org/wiki/cookbooks/devel/core#tcp_reuse_port</a><br>
</div>
<div><br>
</div>
<div>It basically tells the kernel not to choose a new port at
random for a new connection, but it will try to reuse the
existing port (in your case 5071).</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Carsten</div>
<div><br>
</div>
<div><br clear="all">
<div>
<div dir="ltr" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">--</div>
<div dir="ltr">Carsten Bock I CTO & Founder</div>
<div dir="ltr"><br>
<p style="margin:0cm 0cm
0.0001pt;background-image:initial;background-position:initial;background-repeat:initial"><span
style="color:black" lang="EN-US">ng-voice
GmbH</span><span
style="color:rgb(0,112,192)" lang="EN-US"></span></p>
<p
style="margin-right:0cm;margin-bottom:12pt;margin-left:0cm;background-image:initial;background-position:initial;background-repeat:initial"><span
style="color:black" lang="EN-US">Trostbrücke
1 I 20457 Hamburg I Germany<br>
T +49 40 524 75 93-40 | M +49 179 2021244
I <a href="http://www.ng-voice.com/"
style="color:rgb(17,85,204)"
target="_blank" moz-do-not-send="true"><span
style="color:black">www.ng-voice.com</span></a></span></p>
<p style="margin:0cm 0cm
0.0001pt;background-image:initial;background-position:initial;background-repeat:initial"><span
style="color:black" lang="EN-US">Registry
Office at Local Court Hamburg, HRB 120189<br>
Managing Directors: Dr. David Bachmann,
Carsten Bock</span></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Am Mi., 4. Nov. 2020 um
12:07 Uhr schrieb Kjeld Flarup <<a
href="mailto:kjeld.flarup@liberalismen.dk" target="_blank"
moz-do-not-send="true">kjeld.flarup@liberalismen.dk</a>>:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hello<br>
<br>
I have a Kamailio running behind NAT, which sends calls to a
VOIP <br>
service provider.<br>
<br>
I have setup the Kamalio to listen on port 5071, and also
setup a port <br>
forward in the router.<br>
<br>
Now the problem is that with TCP, 5071 is not used for the
dialog, but a <br>
new port is chosen everytime. This means that when the
mobile phone <br>
called hands up, I never sees the BYE, because BYE is a new
dialog.<br>
<br>
<br>
To which port is the server supposed to send the BYE, and
what field <br>
tells the server this.<br>
<br>
<br>
-- <br>
-------------------- Med Liberalistiske Hilsner
----------------------<br>
Civilingeniør, Kjeld Flarup - Mit sind er mere åbent end
min tegnebog<br>
Sofienlundvej 6B, 7560 Hjerm, Tlf: 40 29 41 49<br>
Den ikke akademiske hjemmeside for liberalismen - <a
href="http://www.liberalismen.dk" rel="noreferrer"
target="_blank" moz-do-not-send="true">www.liberalismen.dk</a><br>
<br>
<br>
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