<p>There are a few primary ways I've been bumping into this:</p>
<ul>
<li>On long calls, things go haywire once the session timer fires and the INVITE is sent.</li>
<li>On calls longer than a few minutes, the BYE goes haywire.</li>
<li>On endpoints behind NAT, the ACK and BYE packets towards the UA aren't sent to the observed public IP; they're sent to the LAN IP (without topos, they go to the right place).</li>
</ul>
<p>The final example can be observed with my post about Steps to Reproduce.  The prior examples are in the various dialogs & sip traces provided.</p>

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