5.1.10 Charging support for TRF

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

In order to support traffic for the Roaming Architecture for Voice over IMS with Local Breakout, IMS TF are enhanced with additional routing functionality, both combined in a Transit and Roaming Function (TRF and defined in TS 23.228 [201]. Depending on the transit operator configuration, these functions might reside in a stand-alone entity or be collocated with an existing IMS Network Element.

When residing in a stand-alone entity, the TRF may apply offline charging.

When collocated with an existing IMS Network Element, charging information for the TRF is combined with charging information of the corresponding IMS Network Element. Applicable fields are in table 6.3.2.1.