<h3>Description</h3>
<p><a href="http://kamailio.org/docs/modules/4.4.x/modules/dialog.html#dialog.p.track_cseq_updates" rel="nofollow">track_cseq_updates</a> of <em>dialog</em> module seems to fail in cseq number adaptation of subsequent ACK once <a href="http://kamailio.org/docs/modules/4.4.x/modules/uac.html#uac.f.uac_auth()" rel="nofollow">uac_auth()</a> function of <em>uac</em> module transaction fails:</p>
<ol>
<li>INVITE sent by UAC (CSeq 100).</li>
<li>407 from UAS.</li>
<li>INVITE generated by uac_auth (CSeq 101).</li>
<li>500 from UAS.</li>
<li>INVITE to another carrier (CSeq 100)</li>
<li>200 OK from carrier.</li>
<li>ACK (CSeq 101 instead of 100).</li>
</ol>
<p>ACK CSeq is increased by one but it shouldn't as it is acknowledging INVITE in step 5.</p>
<h3>Troubleshooting</h3>
<h4>Reproduction</h4>
<p>The issue can be reproduced with the logic mentioned above (track_cseq_updates=1):</p>
<ul>
<li>Initial INVITE</li>
<li>INVITE generated by uac_auth in failure_route</li>
<li>INVITE to another destination in failure_route</li>
<li>CSeq in ACK is increased by one</li>
</ul>
<h4>SIP Traffic</h4>
<p>See attached pcap file (<a href="https://github.com/kamailio/kamailio/files/1548079/cseq_tracking_wrong_ack.pcap.gz">cseq_tracking_wrong_ack.pcap.gz</a>) that involves following parties:</p>
<ul>
<li>155.179.229.105: UAC that sends the INVITE.</li>
<li>155.179.229.109: Kamailio</li>
<li>202.165.186.162: Initial carrier (the one that asks for SIP auth)</li>
<li>9.189.124.97: Second carrier</li>
</ul>
<h3>Additional Information</h3>
<ul>
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<pre><code>version: kamailio 4.4.6 (x86_64/linux) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown 
compiled with gcc 4.9.2
</code></pre>
<ul>
<li><strong>Operating System</strong>:</li>
</ul>

<pre><code>Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-2 (2016-04-08) x86_64 GNU/Linux
</code></pre>
<p>Is there any way to disable CSeq mangling triggered by uac_auth once this transaction fails to prevent this mangling from breaking the subsequent ACK transaction?</p>
<p>Thank you and regards,</p>

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