Abstract: Apparatus configured to operate as a network element within an IMS to provide services to a subscriber. The apparatus comprises a receiver for receiving charging function information for the subscriber provided by a subscriber profile server, the charging function information including an indication of a plurality of IMS network element types that may be used to provide services to the subscriber and, for each of the plurality of IMS network element types, specifying whether an IMS network element of that type should send charging information for the subscriber to an offline charging function and whether an IMS network of that type should send charging information for the subscriber to an online charging function.