Olivetti OFX 5500 Instruction Manual page 34

Fax operation (Basic)
<One-touch dialling>
In order to use the one-touch keys for dialling, it is necessary to register, in advance, the desired
destination fax or telephone number under one of the one-touch keys. (Refer to "(1) Registration",
page 33.)
* When an unregistered one-touch key is pressed, "NOT IN USE" will be displayed. Verify the correct
one-touch key and press that key.
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