The Survivable CDR feature is used to store CDR records to a server’s hard disk. For Survivable Core and Survivable Remote Servers, the Survivable CDR feature is used to store the CDR records generated from calls that occur when a Survivable Remote or Survivable Core Server is controlling one or more gateways or port networks. The Survivable CDR feature provides the ability to store CDR records on the hard disk of the server.

When the Survivable CDR feature is enabled, the CDR records are saved in a special directory named /var/home/ftp/CDR on the server’s hard disk. The CDR adjunct retrieves the Survivable CDR data files by logging into the server and copying the files to its own storage device. The CDR adjunct uses a special login that is restricted to only accessing the directory where the CDR records are stored. After all the files are successfully copied, the CDR adjunct deletes the files from the server’s hard disk and processes the CDR records in the same manner that it does today.

The CDR adjunct must poll each main, Survivable Remote Server, and Survivable Core Server regularly to see if there are any new data files to be collected. This is required even when a Survivable Remote or Survivable Core Server is not controlling a gateway or a port network because the CDR adjunct has no way of knowing if a Survivable Remote or Survivable Core Server is active.

The Survivable CDR feature uses the same CDR data file formats that are available with legacy CDR.