A policy control component may be installed in a telecommunication network as a “supplemental” or “proxy” policy control component that may be given limited interaction with the telecommunication network. The proxy policy control component may communicate with policy enforcement devices in an external network. In one implementation, a method may include monitoring a first network to obtain information relating to a traffic flow through a gateway associated with the first network, the gateway connecting the first network to a second network. The method may further include establishing a communication session with a policy enforcement device located within the second network; and transmitting over the communication session, and to the policy enforcement device, information relating to enforcement of network policy functions for the traffic flow.