5.1.1 IMS charging applicability

32.2603GPPCharging managementIP Multimedia Subsystem (IMS) chargingRelease 17Telecommunication managementTS

The IMS node may select charging method, i.e. online, offline or converged. The selection can be made based on local configuration or a combination of local configuration and received OCS/CDF addresses.

If a combination of local configuration and received OCS/CDF addresses and:

– only OCS address received, then either online charging (over Ro) or converged charging (over Nchf) may be used based on local configuration.

– only CDF address received then either offline charging (over Rf), converged charging (over Nchf) or offline only charging (over Nchf) may be used based on local configuration.

– both OCS and CDF address received then either online and offline changing (over Ro and Rf), or converged charging (over Nchf) may be used based on local configuration.

– neither OCS nor CDF address received then depending on IMS node any of the above may be used based on local configuration.

The CDF and OCS addresses transferred in SIP signalling are encoded in the P-Charging-Function-Addresses as defined in TS 24.229 [204] and RFC 7315 [406]. The P-Charging-Function-Addresses header contains the following parameters: CCF (i.e. CDF) and ECF (i.e. OCS).