Data incorporated in call detail records (CDR), obtained from network switches, are subjected to processing by a statistics engine which maintains separate counts for CDR events relating to certain calls, such as 800 number and 900 number calls. Such events, such as attempted calls, completed calls, and duration, form statistics for network users. Compilation of statistics may be done for different services, such as total summary counts and counts by originating area code. In the case of 800 numbers, the statistical counts for the various services are compiled in accordance with the 800 number or 900 number called. When a network user decides to change the statistical services required, it is easily accomplished by changing the rules for interrogating the CDR data, as opposed to the prior art approach of changing programming coding. A network information concentrator collects, at a single point, call records from various network elements. This enables the concentrator to create data buffers of CDRs that are input to the statistics engine for processing.