https://lists.kamailio.org/pipermail/sr-users/2016-January/091492.html
pua - db_mode set to 0. This stops multiple states for a single dialog (early, trying, confirmed and terminated) from showing in the presentity table. I suspect this is a bug?
I still see this behavior and I think is related to this code since pua_dialoginfo never sets etag when calling ``send_publish()``