One of my VOIP phones does not re-regiter after a UTM restart. I noticed tis issue in the previous release of 9.4b.
I have not been able to find anything in the logs showing connection details. Now I am not sure about the setup packets actually appearing in any of the logs, becasue it has been a long time between issues with VOIP.
To fix the issue I have to restart the VOIP box.