When exporting calls the name of the audio file only contains the Date/Time and phone number you either received a call from or dialled out to.
It would be beneficial to have further identifiers on the call export to show the user and then the number so you know who the call is applicable to as well as a unique ID would be helpful.
At the moment it’s difficult to say by looking at a audio file whether it was an inbound or outbound call so having ‘User -> Number’ would signify outbound and ‘Number -> User’ to signify inbound.