Aastra 9617 Online User's Manual page 173

Business
The Business tab is used to enter the name, address, and
telephone number of a contact, as well as other contact
information.
Note: Do not press the Enter key (to create line breaks) in
the Address field. If you enter hard returns in this field,
you may have problems importing and exporting
contacts.
Information that you must fill in
You must enter the first name, last name and at least one
phone number before you can successfully add a contact
to the Address Book.
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