AT&T 993 - Manual (Page 46)

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One-touch operation (speed dial)
Chain dialing
If the number you want to store is too long, you can
split the number and store it in two or more one-touch
locations (both the upper and lower locations).
To dial a number that is stored in both the upper and
lower locations of a one-touch key:
Press one of the LINE keys to select a line, then lift
the handset or press SPEAKER or press HEADSET (if a
headset is connected).
Press the one-touch key for the number you stored.
Press
LOWER, then press the one-touch key again to
dial the number.
To dial a number that is stored in two or more one-touch
keys:
Press one of the LINE keys to select a line, then lift
the handset or press SPEAKER or press HEADSET (if a
headset is connected).
Press the one-touch keys consecutively to dial the
number.
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2.
3.
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2.
One-touch (speed dial)