Syncing Additional Contact Form 7 Fields with CSV Download Log

I don’t believe that can be done without modifying the PHP code. If you look in export.php you will see that the fields for the csv are hardcoded in there.

That said, I think any extra fields that are POSTed in the form submission will end up in the field called “posted_data” as a big chunk of xml. You could then parse your phone number field data out of that xml and do something with it.