[SR-Users] Rate Limiting with Kamailio

Hi list, A quick question, What is the best way to limit the rate of the kamailio, Say I want it to process only 200 INVITEs per second I know this can be done using ratelimit module, but what if I want to change this rate dynamically? say, in an overload control scenario, I am getting a recommended rate piggybacked in my replies, and I read it, then how can I change the messge processing rate of kamailio in runtime inside my script? Is there a way to change the rate using ratelimit but inside script as messages come? The RPC function (rl.set_pipe) does it, but can I call it inside my script? Thanks, Alireza