Export
To save the content from an already filled phonebook, right-click onto the “Click here” link at the bottom of the “Addressbook” page on your built-in web interface (“Click here to save the current address book”).
With “Save Target As…” you can save the phone book content in a comma-separated file containing the current address book entries (CSV = Comma-Separated Values).
Import
To load an address book from a file, click on the “Browse” button on the “Addressbook” page in the section entitled "Import Address Book (CSV)". Select the pre-stored CSV file from the storage medium and then press the 'Load' button.