Who can help ?

Actually the accounting servers which in customer network are more complex than normal RADIUS accounting server, except record RADIUS start/stop message, it also can do traffic data inspection, from this view, the server looks like IDS, but a little difference, this accounting servers are user-defined system, inculde a lots layer 7 function, that’s why need all traffic MUST go through these servers. I know the first step which I mentioned is very easyly to implement by iRule, but how can I do about my second flow I mentioned before?? Thanks very much!