In an example method of correlating charging data records within an offline charging system, each of a plurality of sources selects a same one of a plurality of charging functions in which to route charging information associated with a given call session or event. In an example, the plurality of sources corresponds to either a plurality of network elements or a plurality of charging data functions. In another example, the plurality of charging functions corresponds to either a plurality of charging data functions or a plurality of charging gateway functions. At the selected charging function, the routed charging information is correlated.