Question: When a P-CSCF receives a SIP request with an SDP attribute "a=label:flus…" and the media-level SDP attribute "a=3gpp-qos-hint", what additional information shall the P-CSCF provide to the PCRF in the AA-Request, assuming the "FLUS" feature is supported?
Option 1: Only the FLUS-Identifier AVP within the affected Media-Component-Description AVP(s)
Option 2: Both the FLUS-Identifier AVP and the Desired-Max-Latency AVP and/or Desired-Max-Loss AVP
Option 3: The P-CSCF shall not provide any additional information related to "a=3gpp-qos-hint"
Option 4: Only the Desired-Max-Latency AVP and/or Desired-Max-Loss AVP without the FLUS-Identifier AVP
Explanation: When a P-CSCF receives both "a=label:flus…" and "a=3gpp-qos-hint" in a SIP request, it must inform the PCRF about both the FLUS feature support (via the FLUS-Identifier AVP) and provide hints for QoS parameter mapping (via the Desired-Max-Latency AVP and/or Desired-Max-Loss AVP), enabling the PCRF to derive appropriate QoS information if the "FLUS" feature is supported. This ensures comprehensive policy and charging control based on both service information and desired QoS.