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<p class="MsoNormal"><a name="_MailEndCompose"><span lang="EN-GB" style="color:windowtext">Hi Bogdan,<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext">Put some logs in my script, and the ACK is hitting exit/red highlighted part. In this part of the sequential route.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> } else {<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> if ( is_method("ACK") ) {<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> if ( t_check_trans() ) {<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> # non loose-route, but stateful ACK; must be an ACK after
<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> # a 487 or e.g. 404 from upstream server<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> t_relay();<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> exit;<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> } else {<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:red"> xlog("L_WARN", "[$ci] ACK without matching transaction");<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> # ignore and discard<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> exit;<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> }<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="font-family:Consolas;color:windowtext"> }<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext">So apparently it can’t find a transaction. Should the ACK be forwarded all the way to the right endpoint? As that leg has already been acked by opensips
directly according to the trace.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext"><o:p> </o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailEndCompose"><span lang="EN-GB" style="color:windowtext"><o:p> </o:p></span></span></p>
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<p class="MsoNormal"><b><span lang="EN-GB" style="color:windowtext;mso-fareast-language:NL">Van:</span></b><span lang="EN-GB" style="color:windowtext;mso-fareast-language:NL"> Bogdan-Andrei Iancu [mailto:bogdan@opensips.org]
<br>
<b>Verzonden:</b> 12 May 2017 18:28<br>
<b>Aan:</b> users@lists.opensips.org; Rik Broers <RBroers@motto.nl><br>
<b>Onderwerp:</b> Re: [OpenSIPS-Users] Cancel ACK routing<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><tt><span lang="EN-GB" style="font-size:10.0pt">Hi Rik,</span></tt><span lang="EN-GB" style="font-size:10.0pt;font-family:"Courier New""><br>
<br>
<tt>So, without the TH part, it seems that the incoming ACK (from caller side) is not recognized and the 487 is retransmitted. How do you handle that ACK? are you sure it hits a t_relay() or t_newtran() function ?</tt><br>
<br>
<tt>Regards,</tt><br>
<br>
</span><span lang="EN-GB" style="mso-fareast-language:NL"><o:p></o:p></span></p>
<pre><span lang="EN-GB">Bogdan-Andrei Iancu<o:p></o:p></span></pre>
<pre><span lang="EN-GB"> OpenSIPS Founder and Developer<o:p></o:p></span></pre>
<pre><span lang="EN-GB"> </span><a href="http://www.opensips-solutions.com"><span lang="EN-GB">http://www.opensips-solutions.com</span></a><span lang="EN-GB"><o:p></o:p></span></pre>
<pre><span lang="EN-GB"><o:p> </o:p></span></pre>
<pre><span lang="EN-GB">OpenSIPS Summit May 2017 Amsterdam<o:p></o:p></span></pre>
<pre><span lang="EN-GB"> </span><a href="http://www.opensips.org/events/Summit-2017Amsterdam.html"><span lang="EN-GB">http://www.opensips.org/events/Summit-2017Amsterdam.html</span></a><span lang="EN-GB"><o:p></o:p></span></pre>
<div>
<p class="MsoNormal"><span lang="EN-GB">On 05/12/2017 12:28 PM, Rik Broers wrote:<o:p></o:p></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-GB">Hi!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I’m building a proxy between two public endpoints, so no nat involved luckily.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I’ve got everything to work except for the CANCEL. It breaks the same if I start the call from the other endpoint.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Attached a visual of the traffic flow. Not attached, at link here:
</span><a href="https://www.dropbox.com/s/m45wwjlt4cmhy7k/Captuasdre.JPG?dl=0"><span lang="EN-GB">https://www.dropbox.com/s/m45wwjlt4cmhy7k/Captuasdre.JPG?dl=0</span></a><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Now I would like to fix the final 487 ACK bouncing, and it seems to me that opensips should just accept the ACK from the 487 and end the transaction.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The script is based on the standard one after install with some routing logic. So the ACK is handled in the sequential path with this comment:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"># non loose-route, but stateful ACK; must be an ACK after
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"># a 487 or e.g. 404 from upstream server<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I also tried to fix/workaround it with the topology_hiding module, but as soon as the ACK (packet 12 in the diagram) is sent back opensips crashes with
<br>
CRITICAL:core:free_lump: called on a not free-able lump:0x7f9ba2cc9d68 flags=2<br>
and no 487 is being sent to the left endpoint.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">version: opensips 2.3.0-beta (x86_64/linux)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">git revision: 2f688b5<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB">Crash dump with dbg on for the topo hiding scenario available on request, rather not share it on the list
</span><span lang="EN-GB" style="font-family:Wingdings">J</span><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Did I hit an opensips bug or am I missing something?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="mso-fareast-language:NL">Met vriendelijke groet,<br>
<br>
</span><b><span style="color:#84C41B;mso-fareast-language:NL">Rik Broers</span></b><span style="mso-fareast-language:NL"><br>
</span><span style="font-size:9.0pt;color:#212735;mso-fareast-language:NL">Voice Engineer</span><span style="mso-fareast-language:NL"><br>
<br>
</span><a href="mailto:rbroers@motto.nl"><span style="font-size:9.0pt">rbroers@motto.nl</span></a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre><span lang="EN-GB">_______________________________________________<o:p></o:p></span></pre>
<pre><span lang="EN-GB">Users mailing list<o:p></o:p></span></pre>
<pre><a href="mailto:Users@lists.opensips.org"><span lang="EN-GB">Users@lists.opensips.org</span></a><span lang="EN-GB"><o:p></o:p></span></pre>
<pre><a href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users"><span lang="EN-GB">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</span></a><span lang="EN-GB"><o:p></o:p></span></pre>
</blockquote>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:NL"><o:p> </o:p></span></p>
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