I have a quick question, There is something that keeps confusing me, I have a P25 system near me I am monitoring and when someone keys up it will sometimes say different things, I know when it says FM on conventional what that means but sometimes when someone keys up on the system it will say one of three things or a combination of all three.. What do these mean "DG" "VC" or "ID" Usually it will show "ID" which I KNOW what is but sometimes it'll show DG and flash between DG and VC, What do all of these mean? I didn't find it on the manual...Does anyone know?