Setting up Call Flows can be difficult if you don't how what order features take when set up.
Here is a complete list of call flow priorities from the dial plan to help you.
1. Call Rejection (block anonymous callers and blacklisting)
2. In Call Message
3. Priority Feature
4. Remote Dialtone
5. Remote Call back
6. Audio Conference Room
7. Auto-Attendant
8. Agent Queuing
9. Do Not Disturb
10. Call Screening
11. Call forward Always
12. Hunt Groups
13. Simultaneous Ring