AT&T 410 820 - Manual (Page 15)

AUTOMATIC REDIALING
Two features are especially useful when you get a busy signal
or no answer because they let you redial the number with the
touch of a button.
Last Number Redial
To redial the number you most recently dialed, touch Last
Number.
Last Number
On 5- and 10-button voice terminals, you can redial the last
number by dialing #24.
Saved Number Redial
You can save a number for later redialing by touching Saved
Number before you hang up. To redial the saved number, touch
Saved Number. Other calls that you dial do not affect the saved
number. It remains the same until you save a new one.
Saved Number +
On 5- and 10-button voice terminals, you can save a number by
dialing #23 before hanging up. To redial the saved number, dial
#23.
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