Oki 84 - Manual (Page 34)

Handbook
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9 Press the Space One Touch key until the display changes
to
YES < ᮤ > NO < ᮣ>.
10 Press the Yes
ᮤ key.
11 Press the Select Function key to finish. Keep in mind
that all of the outside telephone numbers you program
into your MFP have to begin with your PBX’s access
digit.
! Most PBX systems are digital, however an analog line
from your PBX is required to support fax operations.
! To turn off the PBX LINE and DIAL PREFIX functions,
follow Steps 1-7 above. At Step 8, press the Space key
four times to remove the access digits.