# Overview

Similar to other cloud services , CDR files for DIS will be generated, containing DIS usage information, OTC billing system will fetch these files from certain directory on Common CDR SFTP via public key to complete the charging of DIS.

The file compression agonization, MD5 verification, error file handling are totally same as the CDR files of other cloud services.for details, please refer to document of"OTC CDR File Specifications".

Parent topic: CDR Folder and File Name