This is not a task to be done with fop2, but proper queue config in Asterisk. Anyways, with FOP 2.27 you can enable drag&drop transfers and drag calls out from a queue into your own extension, but you must be free to take the call.
As for proper queue config, look at queue weights (priorities). Look here:
http://www.asteriskdocs.org/en/3rd_Edit ... 88932.html
You can setup two queues, put all incoming emergency calls into the queue with highest weight, and any call waiting there will be served to agents BEFORE the ones on other queues.
Best regards,
