AT&T MERLIN LEGEND Release 4.0 Feature Reference page 338

Feature Reference
Last Number Dial saves whatever you dial, whether the number is valid or not.
If you dial a telephone number and, after the call is connected, dial additional
digits, such as an account number or password, Last Number Dial saves all
digits, including those dialed after the call is connected. In addition, if someone
other than the owner of a display telephone presses the Last Number Dial
button, all dialed digits are shown on the display, including confidential
information such as passwords or account codes.
Last Number Dial does not store numbers dialed through an Extension,
Personal, or System Directory, an inside Auto Dial button, a System Speed Dial
code, or a DSS button.
If the number is dialed using an outside Auto Dial button or Personal Speed Dial
code and includes a special character such as Pause or Stop, the special
character does not work when the number is redialed using Last Number Dial.
Mode Differences
Behind Switch
In Behind Switch mode, when a user manually dials an outside number that
includes a dial-out code (for example, an Automatic Route Selection or pool
dial-out code) required by the host system, the Pauses required to wait for dial
tone from some host systems are not automatically stored for Last Number Dial.
As a result, the user may either hear a fast busy signal or reach a wrong number
when using Last Number Dial.
Key Mode
In Key mode, Last Number Dial cannot be used unless a Feature button is
programmed on an analog multiline telephone in Key mode. This Feature button
is used instead of the
Telephone Differences
Queued Call Consoles
Last Number Dial cannot be used on QCCs.
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Last Number Dial
button to activate the feature code.