<p>Fixing a set of issues related to IMS Ro interface.</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/722'>https://github.com/kamailio/kamailio/pull/722</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>ims_charging: move Expires AVP inside Event-Type AVP, according to TS 32.299</li>
  <li>ims_charging: Ignore Ro Validity-Time AVP if 0 or missing.</li>
  <li>ims_charging: Do not close dialog upon Ro credit control timeout before answer</li>
  <li>ims_charging: Fix double free upon Ro AAA send failure</li>
  <li>ims_charging: Fix sequence of Ro Request-Number AVP</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/722/files#diff-0">modules/ims_charging/ccr.c</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/722/files#diff-1">modules/ims_charging/ims_ro.c</a>
    (1)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/722/files#diff-2">modules/ims_charging/ro_session_hash.c</a>
    (2)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/722/files#diff-3">modules/ims_charging/ro_timer.c</a>
    (5)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/kamailio/kamailio/pull/722.patch'>https://github.com/kamailio/kamailio/pull/722.patch</a></li>
  <li><a href='https://github.com/kamailio/kamailio/pull/722.diff'>https://github.com/kamailio/kamailio/pull/722.diff</a></li>
</ul>

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