They are used as additional criteria. If you don't need them, leave them the default values.
Here is section talking about it in
User GuideFor instance, if you want a specific rule to be enabled only when there is a busy appointment in Calander, see the following simple example:
Rule type: Incoming Call
Filter type: All
Action1: Ignore
Action1: Do nothing
Appointment-Busy Status: Busy
Let me know if you need further assistance. Thanks.