PCF Failover Call Flow

This section describes the PCF failover call flow.
PCF Failover Call Flow
PCF Failover Call Flow Description

Step

Description

1

When a Gx session exists on the PCRF and the local PCF has received the original AAR Initialization message, the PCRF sends the Rx RAR request over gRPC to the local PCF Diameter endpoint.

2

If the local PCF is unreachable or is inactive, the PCRF reattempts to send the Rx RAR request over gRPC to the remote PCF Diameter endpoint.

3

If the remote PCF Diameter endpoint is connected, it forwards the Rx RAR request to P-CSCF.

4

The P-CSCF sends the Rx RAA request to the remote PCF Diameter endpoint.

5

The Remote PCF Diameter endpoint sends the Rx RAA response to the PCRF.