Patent ID: 8521858

Claim:
A method comprising: receiving, by a call session control function (CSCF) device, a request to set up a communication session, the request being associated with a particular user equipment (UE) device; determining, by the CSCF device, an Internet Protocol (IP) address associated with the particular UE device; identifying, by the CSCF device and based on the IP address, a particular packet data network (PDN) gateway associated with the particular UE device; sending, by the CSCF device and to the particular PDN gateway, a request for information identifying a particular policy and a charging rules function (PCRF) device, of a plurality of PCRF devices, associated with the particular PDN gateway; receiving, by the CSCF device and from the particular PDN gateway, the information identifying the particular PCRF device; establishing, by the CSCF device and based on the information identifying the particular PCRF device, an interface with the particular PCRF device; and sending, by the CSCF device and to the particular PCRF device via the interface, session information associated with the communication session.