Snom VoIP Phone - Manual (Page 39)

Call Register
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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.