<h3>Description</h3>

<p>After upgrading kamailio from 4.4.5 to 5.0.2 ACK/BYE packets are routed incorrectly. Instead of routing from KAMAILIO INT IP to SIP UAC <a href="https://github.com/kamailio/kamailio/pull/2" class="issue-link js-issue-link" data-url="https://github.com/kamailio/kamailio/issues/2" data-id="41491271" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#2</a> ACK/BYE packets are routed from KAMAILIO EXT IP to KAMAILIO INT IP.<br>
I attached two diagrams. First is from kamailio 4.4.5 with correct routing. Second is from kamailio 5.0.2 with wrong routing.<br>
One of improtant notice is when topoh module is disabled ACK/BYE packets are routed correctly on kamailio 5.0.2.<br>
Also in kamailio 5.0.2  DURI and RURI of ACK/BYE packets are populated not by Contact value of OK packet from SIP UA <a href="https://github.com/kamailio/kamailio/pull/2" class="issue-link js-issue-link" data-url="https://github.com/kamailio/kamailio/issues/2" data-id="41491271" data-error-text="Failed to load issue title" data-permission-text="Issue title is private">#2</a> but Record-Route value from OK packet. In kamailio 4.4.5 DURI is not populated at all and RURI is correct one.</p>
<h3>Troubleshooting</h3>
<h4>SIP Traffic</h4>

<p>SIP trace diagram from kamailio 4.4.5: <a href="http://imgur.com/5J95spW">http://imgur.com/5J95spW</a><br>
SIP trace diagram from kamailio 5.0.2: <a href="http://imgur.com/TDOGdgA">http://imgur.com/TDOGdgA</a></p>

<h3>Additional Information</h3>
<ul>
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<pre><code>version: kamailio 4.4.5 (x86_64/linux) f98162
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: f98162 
compiled on 03:47:31 Feb 27 2017 with gcc 4.8.5
</code></pre>
<ul>
<li><strong>Operating System</strong>:</li>
</ul>

<pre><code>Red Hat Enterprise Linux Server release 7.3 (Maipo)
Linux 2.6.32-042stab113.21 #1 SMP Wed Mar 23 11:05:25 MSK 2016 x86_64 x86_64 x86_64 GNU/Linux
</code></pre>

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