You should review all the following previous posts:
Click here: http://devcentral.f5.com/default.aspx?tabid=28&view=topic&forumid=5&postid=1683
Click here: http://devcentral.f5.com/default.aspx?tabid=28&view=topic&forumid=1&postid=1850
Click here: http://devcentral.f5.com/default.aspx?tabid=28&view=topic&forumid=5&postid=2234
Click here: http://devcentral.f5.com/default.aspx?tabid=28&view=topic&forumid=5&postid=2274
We are getting very close on the next release where full rtsp support will be available (via an rtsp profile and new RTSP rule events and commands).