Service Units for Quota Management

The SMF sends Charging Data Request (CDR) to the Charging Function (CHF) for the service to be granted authorization to start, and to reserve the number of units. While triggering the CDR, the SMF requests volume (uplink, downlink, total) and time quota from CHF to support VoLTE and other use cases. The values of the requested units for static rules are obtained from the Diameter configuration under Active Charging Service. For the dynamic audio or video rules, the values for the requested service units are configured through the requested-service-unit CLI command in the Charging Profile Configuration mode. For command details, see the Charging Profile Configuration section in the SMF Charging chapter of this guide.