Polycom RMX 1500 Administrator's Manual page 884

Appendix C-CDR Fields - Unformatted File
C-2
The MCU sends the entire CDR file via API or HTTP, and the RMX 1500/
2000/4000 or external application does the processing and sorting. The
RMX 1500/2000/4000 ignores events that it does not recognize, that is,
events written in a higher version that do not exist in the current version.
Therefore, to enable compatibility between versions, instead of adding
new fields to existing events, new fields are added as separate events, so
as not to affect the events from older versions. This allows users with
lower versions to retrieve CDR files that were created in higher versions.
This appendix describes the fields and values in the unformatted CDR records.
Although the formatted files contain basically the same information, in a few
instances a single field in the unformatted file is converted to multiple lines in the
formatted file, and in other cases, multiple fields in the unformatted file are
combined into one line in the formatted file.
In addition, to enable compatibility for applications that were written for the MGC
family, the unformatted file contains fields that were supported by the MGC
family, but are not supported by the RMX 1500/2000/4000, whereas these fields
are omitted from the formatted file.