A computer device may include a memory storing instructions and processor configured to execute the instructions to receive a request associated with a subscriber, wherein the request includes information identifying whether the user is a Fifth Generation (5G) subscriber or information identifying a gateway device associated with the user. The computer device may be further configured to select a Fourth Generation (4G) Policy and Charging Rules Function (PCRF) device or a 5G Policy Control Function (PCF) device based on the information included in the received request and forward the received request to the selected 4G PCRF device or 5G PCF device.

Policy device selection by common IMS

An application function (AF) of an IP Multimedia Subsystem (IMS) can be in communication with multiple Policy Control Function (PCF) domains of a telecommunication network. The AF can review attributes of a particular communication session, and identify a particular one of the PCF domains that corresponds to the attributes. The AF can then send a request about the communication session to a PCF element of the identified PCF domain over an Rx interface.

Optimized policy control function mapping for application function

A P-CSCF (Proxy Call Session Control Function) is a component that services as an entry point into an IMS (IP multimedia subsystem) communications system. During a P-CSCF discovery process, a device is configured to obtain both an identification of a primary P-CSCF and an identification of a secondary P-CSCF. When initiating an IMS data session, a device first attempts to set up the session by communicating with the primary P-CSCF. If that fails, the device then attempts to set up the session by communicating with the secondary P-CSCF.

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Optimized policy control function mapping for application function

SIP Call Continuity Upon Failure