What is the CDR file and why do I need to attach it?

The CDR (Charge Detail Record) file is a machine-readable list of all the charging sessions you're invoicing us for. It allows us to cross-check your invoice against the session data already transmitted via the roaming protocol. Without it, we cannot process your invoice.

The file must be submitted as a CSV (UTF-8 encoded) file, on a single sheet, alongside your PDF invoice.