Hi,
By default the "Display FAC in CDR" service parameter is set to False, which means you will see empty string " " or null under "authCodeDescription". If it is set to True then you will see Authorization Code Name under "authCodeDescription". (Note: CDR data does not include Authorization Code).
In your CUCM, is "Display FAC in CDR" set to True or False? Which tool are you using to view raw CDR file?
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Thanks, Vaijanath S.