A database record unit used to create billing records. A CDR contains details such as the called and calling parties, originating switch, terminating switch, call length, and time of day. When applied to GPRS , CDR are generated typically by the SGSN (Serving GPRS Support Node) and GGSN (Gateway GPRS Support Node), recording data volumes and QoS (Quality of Service) rather than call time. These records are passed to the CGF (Charging Gateway Function) for consolidation prior to being passed to the billing platform. With the introduction of the IMS , the acronym CDR is used to represent a Charging Data Record.