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<p>Daniel,</p>
<p>Seems to be it's really the case, but with other function</p>
<p>With FQDN in RR <br>
</p>
<h3 class="title"> <code class="function">is_first_hop()</code></h3>
<p>is not acting correctly for reply. <br>
</p>
<p>
<blockquote type="cite">For incoming SIP replies, it means that
top Record-Route URI is 'myself' and source address is not
matching it</blockquote>
But in Record-Route we have "myself", but <b>is_first_hop()</b>
returning 0. <br>
</p>
<p>Thanks!<br>
</p>
<pre class="moz-signature" cols="72">Regards,
Igor</pre>
<div class="moz-cite-prefix">On 07.05.2021 14:22, Daniel-Constantin
Mierla wrote:<br>
</div>
<blockquote type="cite"
cite="mid:4f8a3d41-0c37-5031-3885-f2eadff2386c@gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>OK, because looping was something that should not have happened
in this case.</p>
<p>Then the problem is that you do not do nat-traversal-like
processing for websocket/webrtc traffic. You have to use
set_contact_alias() + handle_ruri_alias() because the webrtc
endpoints do not set "valid" contact addresses.</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div class="moz-cite-prefix">On 07.05.21 14:13, Igor Olhovskiy
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:aabd2bf3-ad3a-2c8b-ed10-ec1372161407@gmail.com">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Ah, no, sorry, I was wrong at this one,</p>
<p>This just is not sent with "unable to resolve address
toleivu2gdbh.invalid". <br>
</p>
<p>Sorry. Looping were something else during my tests, this just
with <b>advertise</b> added<br>
</p>
<pre class="moz-signature" cols="72">Regards,
Igor</pre>
<div class="moz-cite-prefix">On 07.05.2021 14:02,
Daniel-Constantin Mierla wrote:<br>
</div>
<blockquote type="cite"
cite="mid:4935457a-8c6f-29cd-ace2-72bfd848bed3@gmail.com">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>This looks like incoming ACK, because there is only one Via
header, so it is not what proxy forwards -- that one is
relevant to see what headers were consumed and added.</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div class="moz-cite-prefix">On 07.05.21 13:51, Igor Olhovskiy
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:bf82d67b-9a4f-123f-46cd-75a593fc315a@gmail.com">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
Sure.
<p><font face="Courier New, Courier, monospace">ACK <a
class="moz-txt-link-freetext"
href="sip:88290@toleivu2gdbh.invalid;transport=wss"
moz-do-not-send="true">sip:88290@toleivu2gdbh.invalid;transport=wss</a>
SIP/2.0<br>
Via: SIP/2.0/UDP
A_IP_ADDRESS:5060;rport;branch=z9hG4bKPj8d05548a-91ef-4332-8617-32f8eeebf8f2<br>
From: <a class="moz-txt-link-rfc2396E"
href="sip:88881@A_IP_ADDRESS" moz-do-not-send="true"><sip:88881@A_IP_ADDRESS></a>;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d<br>
To: <a class="moz-txt-link-rfc2396E"
href="sip:88290@KAMAILIO_FQDN" moz-do-not-send="true"><sip:88290@KAMAILIO_FQDN></a>;tag=hvra7mj3q0<br>
Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb<br>
CSeq: 18326 ACK<br>
Route: <a class="moz-txt-link-rfc2396E"
href="sip:KAMAILIO_FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss"
moz-do-not-send="true"><sip:KAMAILIO_FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss></a><br>
Route: <a class="moz-txt-link-rfc2396E"
href="sip:KAMAILIO_FQDN:8089;transport=ws;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss"
moz-do-not-send="true"><sip:KAMAILIO_FQDN:8089;transport=ws;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss></a><br>
Max-Forwards: 70<br>
User-Agent: Asterisk PBX 13.33.0<br>
Content-Length: 0</font></p>
<p><br>
</p>
<p>By loop I meant, Kamailio just relaying it back to self
and discard.<br>
</p>
<pre class="moz-signature" cols="72">Regards,
Igor</pre>
<div class="moz-cite-prefix">On 07.05.2021 13:48,
Daniel-Constantin Mierla wrote:<br>
</div>
<blockquote type="cite"
cite="mid:13af5047-aa7c-3a96-6684-385fb883d206@gmail.com">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Can you paste the ACK that loops, after being handled
once by Kamailio?</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div class="moz-cite-prefix">On 07.05.21 13:25, Igor
Olhovskiy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:6ca545db-e3f1-f47e-e95f-966864bb8e1a@gmail.com">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Daniel,</p>
<p>Yes, it is.</p>
<p><font face="Courier New, Courier, monospace">alias=...<br>
</font></p>
<p>Also tried with</p>
<p><font face="Courier New, Courier, monospace">listen =
IP advertise FQDN</font><br>
</p>
<p>same behavior, <font face="Courier New, Courier,
monospace">loose_route()</font> stops acting
correctly.<br>
</p>
<p>PS: Forgot to add, Kamailio 5.4.3 / 5.4.4<br>
</p>
<pre class="moz-signature" cols="72">Regards,
Igor</pre>
<div class="moz-cite-prefix">On 07.05.2021 13:21,
Daniel-Constantin Mierla wrote:<br>
</div>
<blockquote type="cite"
cite="mid:6d9f566b-2815-f119-0a8d-7e5bdf06c660@gmail.com">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8">
<p>Hello,</p>
<p>is the KAMAILIO_FQDN set as local domain for
Kamailio (via alias parameter or domain
module+register myself)?</p>
<p>Cheers,<br>
Daniel<br>
</p>
<div class="moz-cite-prefix">On 07.05.21 11:17, Igor
Olhovskiy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:193b9e24-0edb-442a-8df1-27bc04293fb6@gmail.com">
<meta http-equiv="content-type" content="text/html;
charset=UTF-8">
<p>Hello,</p>
<p>I saw there are some topics on this already and
carefully walked through all of them, but can't
solve following issue.</p>
<p>For a reason I do need that in Record-Route
header sent to endpoint would present FQDN. If it
matters, it's UDP/WSS conversion done on Kamailio.</p>
<p>So, scheme is quite simple<br>
</p>
<p>Enpoint A ->UDP-> Kamailio ->WSS->
Endpoint B (NAT)<br>
</p>
<p>Main issue here, that if in Record-Route headers
it's FQDN, but not IP addresses, on a new
transactions with a dialog (ACK on 200, PRACK,
BYE), Kamailio<b> loose_route()</b> function
resolves address of destination not current
dialog, but actual R-URI (or itself, if R-URI is
something from WebRTC world) that is not correct
due to NAT.<br>
</p>
<p>If in RR headers IP addresses are present - all
is working as expected.</p>
<p>As an example (RR with FQDN)<br>
</p>
<p>B answers 200</p>
<p><font face="Courier New, Courier, monospace">SIP/2.0
200 OK<br>
Record-Route: <a class="moz-txt-link-rfc2396E"
href="sip:KAMAILIO_FQDN:8089;transport=ws;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss"
moz-do-not-send="true"><sip:KAMAILIO_FQDN:8089;transport=ws;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss></a><br>
Record-Route: <a class="moz-txt-link-rfc2396E"
href="sip:KAMAILIO_FQDN;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss"
moz-do-not-send="true"><sip:KAMAILIO_FQDN;r2=on;lr=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss></a><br>
Via: SIP/2.0/UDP
<A_IP_ADDRESS>:5060;received=A IP
ADDRESS;rport=5060;branch=z9hG4bKPj67fb6d86-97d7-4231-995b-e54b0f62881e<br>
To: <<a class="moz-txt-link-freetext"
href="sip:88290@" moz-do-not-send="true">sip:88290@</a><KAMAILIO_FQDN>>;tag=hvra7mj3q0<br>
From: <<a class="moz-txt-link-freetext"
href="sip:+XXXX7688881@"
moz-do-not-send="true">sip:+XXXX7688881@</a><KAMAILIO_FQDN>>;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d<br>
Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb<br>
CSeq: 18326 INVITE<br>
Contact: <a class="moz-txt-link-rfc2396E"
href="sip:88290@toleivu2gdbh.invalid;transport=wss"
moz-do-not-send="true"><sip:88290@toleivu2gdbh.invalid;transport=wss></a><br>
Allow:
ACK,CANCEL,INVITE,MESSAGE,BYE,OPTIONS,INFO,NOTIFY,REFER<br>
Supported: outbound<br>
Content-Type: application/sdp<br>
Content-Length: 817</font></p>
<p><br>
</p>
<p>ACK looks like</p>
<p><font face="Courier New, Courier, monospace">ACK
<a class="moz-txt-link-freetext"
href="sip:88290@toleivu2gdbh.invalid;transport=wss"
moz-do-not-send="true">sip:88290@toleivu2gdbh.invalid;transport=wss</a>
SIP/2.0<br>
Via: SIP/2.0/UDP
A_IP_ADDRESS:5060;rport;branch=z9hG4bKPj8d05548a-91ef-4332-8617-32f8eeebf8f2<br>
From: <a class="moz-txt-link-rfc2396E"
href="sip:88881@A_IP_ADDRESS"
moz-do-not-send="true"><sip:88881@A_IP_ADDRESS></a>;tag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d<br>
To: <a class="moz-txt-link-rfc2396E"
href="sip:88290@KAMAILIO_FQDN"
moz-do-not-send="true"><sip:88290@KAMAILIO_FQDN></a>;tag=hvra7mj3q0<br>
Call-ID: 46f44741-d155-4dd5-8fd8-78e540fc1acb<br>
CSeq: 18326 ACK<br>
Route: <a class="moz-txt-link-rfc2396E"
href="sip:FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss"
moz-do-not-send="true"><sip:FQDN;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss></a><br>
Route: <a class="moz-txt-link-rfc2396E"
href="sip:FQDN:8089;transport=ws;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss"
moz-do-not-send="true"><sip:FQDN:8089;transport=ws;lr;r2=on;ftag=0a3e31a6-96ad-42d0-9310-81b35cedbd3d;nat=wss></a><br>
Max-Forwards: 70<br>
User-Agent: Asterisk PBX 13.33.0<br>
Content-Length: 0</font><br>
</p>
<p>And Kamailio on <b>loose_route()</b> loops ACK
to itself. (with result of function == 1)<br>
</p>
<p>In a case if in Record-Route/Route headers just
IP address of Kamailio present, all works as
expected, but it's not really behavior I want to
achieve.</p>
<p>I've tried to play with <b>record_route_preset("...")</b>
specifying only WSS part (as suggested in <a
class="moz-txt-link-freetext"
href="https://skalatan.de/de/blog/kamailio-sbc-teams"
moz-do-not-send="true">https://skalatan.de/de/blog/kamailio-sbc-teams</a>)
with FQDN, but no luck.</p>
<p>Also wanted to try approach using
record_route_preset() function in branch route,
but it was working only with first branch, not
affecting others (but I assume having different RR
headers across branches is not a good idea)</p>
<pre class="moz-signature" cols="72">--
Regards,
Igor</pre>
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Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com" moz-do-not-send="true">www.asipto.com</a>
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Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com" moz-do-not-send="true">www.asipto.com</a>
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</blockquote>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com" moz-do-not-send="true">www.asipto.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda" moz-do-not-send="true">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda" moz-do-not-send="true">www.linkedin.com/in/miconda</a>
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</blockquote>
</blockquote>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-abbreviated" href="http://www.asipto.com" moz-do-not-send="true">www.asipto.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda" moz-do-not-send="true">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda" moz-do-not-send="true">www.linkedin.com/in/miconda</a>
Kamailio Advanced Training - Online
May 17-20, 2021 (Europe Timezone) - June 7-10, 2021 (America Timezone)
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