The directory path on the FTP server where a file with CDR records is to be stored. The trailing '/' is not required. Within this directory, each device will have its subdirectory. The device subdirectory name is constructed from the device IP address as follows: '172-16-80-224'. The device subdirectory is created remotely from the device by using the FTP protocol. All call records from a device are stored in text files. All file names for a single device are unique and constructed as follows: YYYY-MM-DD-HH-MM-SN, where: YYYY - year MM - month DD - day HH - hour MM - minute SN - sequence number in case two subsequent raports are generated within the same minute.
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)