<p><a href="https://github.com/razvancrainea" class="user-mention">@razvancrainea</a> I was still seeing this bug yesterday on a vanilla 2.1 install, did it get backported to 2.1?</p>

<p>I admit I did not hugely investigate the cause, however it was very reproducible within some SIPP scripts, and  when I stopped setting the missed_call flag the bug stopped - in this case acc was using mysql backend rather than flatstore.</p>

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