Reference BillMax CDR Rate Deck The BillMax CDR Rate deck is a Comma Separated Value (CSV) file used to determine what calls are Plan calls and to rate Long Distance calls. The header line "Description,Destination,Rate,Minimum Duration,Increment,Connect Fee" is required. BillMax CDR Input Format The BillMax CDR file input format is a Comma Separated Value (CSV) file. If there is no header line, the order documented below is assumed. Processing of original CDRs should result in this format. Fields are optional within reason, but use a header line if not specifying every field. Processing of the header line is case insensitive. VOIP Glossary