Oki OKIFAX 5900 User Handbook Manual page 45

5 Input the digit(s) normally dialed to obtain an outside line
from the PBX, press Enter.
6 Press Menu/Exit to return to standby mode.
* Dial Prefix can also be accessed from the main menu by
entering its speed access code 51.
!
Keep in mind that all of the outside telephone numbers
programmed into the machine must begin with the dial
prefix of the PBX.
To cancel these parameters at a later date, follow the
above instructions but set the PBX Line parameter to
OFF.
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Handbook 37