If you use a Business Communications Manager, various Fax mailbox options are available. To enable each option, you must have a keycode.
Fax Messaging keycode enables the use of Fax in Subscriber Mailboxes
Fax Overflow keycode enables Fax Overflow
Fax On Demand keycode enables Fax on Demand
Fax Suite keycode enables Fax Messaging, Fax Overflow and Fax On Demand
Fax includes: