Permanent Changes

I'm trying to add a few services to the permanent configuration of a zone using Python. I've gone over the DBus interface quite extensively, but I can't figure out how to make /org/fedoraproject/FirewallD1 addService() persistent. I thought that /org/fedoraproject/FirewallD1/config addService() might be correct, but the method doesn't seem to work (testing in qdbusviewer) and has a drastically different method definition: <method name="addService"> <arg direction="in" type="s" name="service"/> <arg direction="in" type="(sssa(ss)asa{ss})" name="settings"/> <arg direction="out" type="o"/> </method> 1) Is there a way through DBus to make a change permanent? 2) If not, how do I make permanent changes to a zone without using firewall-cmd shell commands? Thanks, Justin