Hi,
In Asterisk queues you can have static memebers (the ones defined in queues.conf), and dynamic members (the ones added via dialplan, ami or agi via "addqueuemember").
If you have the options persistenmembers=yes in queues.conf, any dynamic member that is added to a queue will be "remembered" by asterisk when it is restarted, so you do not have to ask the agent to log again if asterisk crashes or is restarted for whatever reason. The data is stored in the astdb (hint: use "database show" in the asterisk cli to see the contents of the whole astdb).
You can use both types. FOP2 will work only on dynamic members, that means that you cannot REMOVE a static member from fop2 (but you can pause/unpause it).
Trixbox is dated in that regard, more recent FreePBX versions include in the queues config page a way to define static and dynamic members and even set restrictions on what extensions can be added dynamically or not. FOP2 will honor those freepbx settings.
Best regards,
