A.19 Handling of a FLUS session

29.2143GPPPolicy and charging control over Rx reference pointRelease 17TS

If the P-CSCF receives a SIP request that requires provisioning of service information to the PCRF, the "FLUS" feature is supported and an SDP attribute "a=label:flus…" is included in one or more of the received SDP media descriptions, the P-CSCF shall provide the string after "a=label:" starting with "flus" within the FLUS-Identifier AVP within the affected Media-Component-Description AVP(s) in the AA-Request to the PCRF.

NOTE: During the first interaction with the PCRF, the P-CSCF does not know if the "FLUS" feature is supported by the PCRF. In this case the P-CSCF will include the information as if supported.

If additionally the P-CSCF receives the "a=3gpp-qos-hint" media-level SDP attribute in the SIP request, the P-CSCF shall provide the PCRF with the Desired-Max-Latency AVP and/or Desired-Max-Loss AVP as described in 3GPP TS 29.213 [9], clause 6.2.

Upon receiving the information from the P-CSCF and if the "FLUS" feature is supported, the PCRF shall derive the QoS information as described in 3GPP TS 29.213 [9], clause 6.3.