I assume you want to ingest the call detail records from Feebbx . You would need to follow their documentation [ e.g. https://wiki.freepbx.org/display/FPG/CDR+User+Guide] to download the CDR files to a folder where the splunk universal forwarder can read the files [ by manual or scheduled jobs]. Once the files are available in the folder, you can use inputs.conf to read and send it to splunk indexer [ https://docs.splunk.com/Documentation/Splunk/7.2.1/Data/Monitorfilesanddirectorieswithinputs.conf]
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