Section: 4.3.3.1 Charging Trigger Function (CTF)
Content: The Charging Trigger Function (CTF) interacts with the Charging Function (CHF) of the Converged Charging System (CCS) using Nchf interface for consuming CHF services as defined in TS 32.290[ Telecommunication management; Charging management; 5G system; Services, operations and procedures of charging using Service Based Interface (SBI) ]  [57]: - converged charging (Nchf_ConvergedCharging service) wich operates: - with quota management (online charging); - without quota management (offline charging); - offline only charging (Nchf_OfflineOnlyCharging service). The behaviour of the Charging Trigger Function (CTF) embedded in the service element, sub-system component or Core Network element is specified in the respective middle tier charging specifications.