<ul>
<li>Mention when FR timeout is reached, and which of FR timers expired</li>
<li>Log when starting FR/RETR timers</li>
<li>log when changing default timeouts to user-set values</li>
<li>log when resetting fr/retr timers on provisional replies</li>
</ul>


<h4>Pre-Submission Checklist</h4>



<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Commit message has the format required by CONTRIBUTING guide</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Commits are split per component (core, individual modules, libs, utils, ...)</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Each component has a single commit (if not, squash them into one commit)</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> No commits to README files for modules (changes must be done to docbook files<br>
in <code>doc/</code> subfolder, the README file is autogenerated)</li>
</ul>
<h4>Type Of Change</h4>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Small bug fix (non-breaking change which fixes an issue)</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> New feature (non-breaking change which adds new functionality)</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Breaking change (fix or feature that would change existing functionality)</li>
</ul>
<h4>Checklist:</h4>

<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> PR should be backported to stable branches</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Tested changes locally</li>
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox"> Related to issue #XXXX (replace XXXX with an open issue number)</li>
</ul>
<h4>Description</h4>

<p>The main reason for these changes is that we haven't found any possibility to distinguish which of <code>fr</code> timeouts expires. The rest of the logs are also helpful, but secondary.<br>
As they all are under <code>ifdef TIMEOUT_DEBUG</code> I hope it is not a big deal.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/kamailio/kamailio/pull/2818'>https://github.com/kamailio/kamailio/pull/2818</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>tm: enhance fr/retr timers logging</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/2818/files#diff-530586068e0d1632252e08529c32ec4e2c46ecaa5e8a913ed9ad4e5853de493a">src/modules/tm/t_lookup.c</a>
    (6)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/2818/files#diff-b4c2c5a3ccdef728dd9e2f250d52811841e9f652525aab270e76f0761ff1f041">src/modules/tm/t_reply.c</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/2818/files#diff-f40adc0efd836210c2f3e832bc8b5eb609cff397720ee64c603d43fd1450d481">src/modules/tm/t_suspend.c</a>
    (3)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/2818/files#diff-c9675f6dd2104010a4207c7ab689e437c6e1f3cd2ca14cb34991ce67457695ea">src/modules/tm/timer.c</a>
    (7)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/2818/files#diff-4663a8a205fc76f455adeb9e78882917c6b4c732f6879de6c0cedf09a31cb398">src/modules/tm/timer.h</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/kamailio/kamailio/pull/2818.patch'>https://github.com/kamailio/kamailio/pull/2818.patch</a></li>
  <li><a href='https://github.com/kamailio/kamailio/pull/2818.diff'>https://github.com/kamailio/kamailio/pull/2818.diff</a></li>
</ul>

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