Question: What is the primary function of the Charging Gateway Function (CGF) in the 3GPP network?
Option 1: To generate CDRs from the CDF.
Option 2: To act as a gateway between the 3GPP network and the Billing Domain (BD), transferring CDR files via the Bx reference point.
Option 3: To perform CDR reception from the BD via the Ga reference point.
Option 4: To store CDRs on separate files based on filtering criteria.
Explanation: The CGF acts as a gateway between the 3GPP network and the Billing Domain (BD), transferring CDR files via the Bx reference point. This is its primary function, as it enables the transfer of charging data from the 3GPP network to the billing system for further processing and analysis.