Customer Data Record: a data file with billing data for each voice or data transaction. The RAW CDR used by MNO networks and exchanged through clearing houses use TAP files, with the present 3.x TAP file specification using 64 paramentes with data inclduing IMEI of the handset, RAT type and more. These CDRs need specific software to process and so for reconciliation and so MVNO billing CDRs are usually processed to CSV format with usually the basic data enclosed needed for an MVNO to bill customers: start of session, end of session and duration of session of relevant, minutes, megabytes or messages sent, the subscriber ID, and data and type. MVNO CDRs are usually accessed by SFTP and update every 15 minutes.