How can I access CDR records in Hosted instances?

In the hosted by 3CX solution, you have no access to the filesystem. Therefore you need to post the CDR records to your own server by setting up the system as CDR client. 
Navigate to https://{Your-FQDN:Port}/#/app/settings/cdr/1 and select the below-shown option. 

Set the destination server IP and Port where you expect the records to be sent to.
Note: 3CX does not cache records when your CDR server is offline!