CDR Update for Immediate CC Events
The QUERY_INTERFACE IE supports sending the CDR message to the CHF for immediate CC events. If the CC trigger occurs at SMF and the trigger is armed at session level, the SMF queries the online and offline URRs at UPF, and the RADIUS URR if accounting is enabled. The QUERY_INTERFACE IE enables SMF to discover the URR that is available at UPF. This IE is configured along with the QUARR flag while sending the N4 Modification Request.
If the QUARR flag is not configured, the UPF does not report all URRs even if the QUERY_INTERFACE IE is configured. If QUARR flag is configured with the QUERY_INTERFACE IE, the Query URR will not be relayed to the UPF. This functionality is enabled or disabled using the query-all-urr CLI command in the Charging Profile configuration. By default, the configuration is enabled.
The QUERY_INTERFACE IE is a composite IE with bits for various interfaces.
The following flags are mapped to the specific URRs:
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GZ_Offline—Maps to interface 1 and UPF reports all offline SDF URRs.
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GY_Online—Maps to interface 7 and UPF reports all online SDF URRs.
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Radius_URR—Maps to interface 9 and UPF reports RADIUS URR.
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Bearer_URR—Maps to interface 2 and UPF reports all QBC URRs.
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Sess_URR—Maps to interface 12 and UPF reports Session level URR.