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<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I have a tcpdump capture but the traffic is encrypted. So it won’t help you.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I have a clue how it happened:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">When the first 200 response was received, kamailio successfully matched a transaction:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Jul 23 00:40:14 /usr/sbin/kamailio[570]: DEBUG: tm [t_lookup.c:972]: DEBUG: t_reply_matching: hash 51776 label 624824282 branch 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Jul 23 00:40:14 /usr/sbin/kamailio[570]: DEBUG: tm [t_lookup.c:1032]: DEBUG: t_reply_matching: reply matched (T=0x7fb52d367f50)!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">But when the locally generated 408 happened, kamailio failed to match a transaction:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Jul 23 00:40:44 /usr/sbin/kamailio[583]: DEBUG: tm [t_lookup.c:972]: DEBUG: t_reply_matching: hash 51776 label 624824282 branch 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Jul 23 00:40:44 /usr/sbin/kamailio[583]: DEBUG: tm [t_lookup.c:1066]: DEBUG: t_reply_matching: no matching transaction exists<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Because no transaction was matched, kamailio simply forwarded the response.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’ll modify this behaviour in the source code. After receiving the first final response, there is no reason to keep the fr_timer running on other branches, right?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Allen<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:EN-NZ">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:EN-NZ">
sr-users-bounces@lists.sip-router.org [mailto:sr-users-bounces@lists.sip-router.org]
<b>On Behalf Of </b>Daniel-Constantin Mierla<br>
<b>Sent:</b> Wednesday, 23 July 2014 10:41 p.m.<br>
<b>To:</b> Kamailio (SER) - Users Mailing List<br>
<b>Subject:</b> Re: [SR-Users] MESSAGE forking bug(?)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hello,<br>
<br>
can you get the sip traffic with ngrep on kamailio server? It can be taken with:<br>
<br>
ngrep -d any -qt -W byline port 5060<br>
<br>
Cheers,<br>
Daniel<o:p></o:p></p>
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<p class="MsoNormal">On 23/07/14 03:08, Allen Zhang wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I believe there is a bug on MESSAGE forking.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Test scenario:<o:p></o:p></p>
<p class="MsoNormal">User A has two records in the location table, with different instance ids: 111 and 222.<o:p></o:p></p>
<p class="MsoNormal">One of user A’s instance is killed, hence 222 is not reachable.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">User B send a MESSAGE to user A.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Kamailio forked the MESSAGE.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Kamailio got a ‘200 Message delivered’ response from 111 and forwarded it to user B.<o:p></o:p></p>
<p class="MsoNormal">The MESSAGE forked to 222 timed out. Kamailio send a ‘408 Time out’ to user B.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">This violates RFC 3428 section 4. It states that the forking UAS should only send ONE final response to the sender UAC.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Forking is done by t_relay(), and the registrar parameter ‘append_branches’ is set to default value 1.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Did I do something wrong, or there is a bug?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal">Allen<o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-NZ"> </span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-NZ"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:sr-users@lists.sip-router.org">sr-users@lists.sip-router.org</a><o:p></o:p></pre>
<pre><a href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</a><o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-NZ"><br>
<br>
<o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre>
<pre>Daniel-Constantin Mierla - <a href="http://www.asipto.com">http://www.asipto.com</a><o:p></o:p></pre>
<pre><a href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a><o:p></o:p></pre>
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