various exemplary embodiments relate to a method and related network node including one or more of the following : receiving a message at a pcrn ; determining whether a policy decision should be made with regard to the received message ; when a policy decision should be made : identifying a rule of a plurality of rules as applicable to processing the received message , wherein the identified rule specifies an action to be taken in response to the received message , performing the action in response to the received message ; and when a policy decision should not be made , processing the received message according to normal procedures . such action may include one or more of the following : rejecting a request , accepting a request , modifying a request , and performing a predefined routine .