AT&T 983 - Manual (Page 21)

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Telephone numbers called most frequently can
be stored in speed dial keys so that they can be
dialed with only one key press.
You can enter 24 telephone numbers with up to
24 digits each. There are 12 speed dial keys and
each key has two locations (upper locations and
lower locations) to store two telephone numbers
separately.
You may wish to write the telephone numbers
stored near the speed dial key on the memory
card. Remove the plastic cover and the memory
card. Write the telephone numbers or names
on the light gray spaces for the upper locations
and the dark gray spaces for the lower locations.
Replace the memory card and plastic cover.
Timeouts and error messages
If you pause for too long while creating an entry,
the process will time out and it will be necessary
to start again. If you store a number in a memory
location that is already in use, the old number will
be overwritten with the new number.