First of all I am not the big linux expert. But has been running Elastix 2.3 until now,
It seems there is a bug in Issabill 4 - 14-07-2017.
if you want to change networking from webgui
If I install Issabell with networking set as DCHP and afterwards try to change it from the webgui to STATIC Its impossible to set the DNS server.
If I choose the settings under the installation of Issabell (Static) and set the parametres for my network it words ok - but also there it seems there is a bug. Its only possible to set one DNS Server.
Besides that its a greet job you have done all of you.
Greeting from Denmark
Joergen