Question: When an Application Function (AF) instructs the Policy and Charging Rules Function (PCRF) to enable a media flow with RTCP via Media-Sub-Component AVP, what happens to the corresponding RTCP IP Flows in both directions if the Flow-Status AVP is set to ENABLED-UPLINK?
Option 1: The RTCP IP Flows in both directions are enabled regardless of the Flow-Status setting.
Option 2: Only the uplink RTCP IP Flow is enabled, while the downlink remains disabled.
Option 3: Both uplink and downlink RTCP IP Flows remain disabled until explicitly set to ENABLED.
Option 4: The PCRF will reject the request due to conflicting flow status for RTCP.
Explanation: According to the specified behavior, if a Media-Sub-Component AVP contains a Flow-Usage AVP with the value RTCP, then the corresponding RTCP IP Flows in both directions shall be enabled, regardless of whether the Flow-Status AVP is set to ENABLED-UPLINK, ENABLED-DOWNLINK, ENABLED, or DISABLED. This ensures that RTCP flows are always bi-directional when enabled for a media flow.