The OFCS is the main element of a service provider’s offline (postpaid) billing architecture. In this capacity, the OFCS interacts with a number of network nodes e.g. MSC, SGSN, CSCF, all of which can potentially provide billing related data. The OFCS includes functions such as the CDF (Charging Data Function) and CGF (Charging Gateway Function) which are used to collect and present CDRs (Charging Data Records) to the billing domain.
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