Lucent Technologies MLS-model Programming And Use Manual page 322

Feature Reference
3. Dial the two-digit Personal Speed Dial code (80–99).
If you did not specify an outside line or pool, the system automatically
selects one, turns on the speaker if the handset is in the cradle, and dials
the number.
The number being dialed shows on a display phone.
Standard Phone
You can dial Personal Speed Dial numbers on a standard phone, but the numbers
must be programmed from extension 10 or 11. To dial a programmed Personal
Speed Dial number:
1. Lift the handset.
You hear intercom dial tone.
2. Press
3. Dial the two-digit Personal Speed Dial code (80–99).
The system automatically selects an outside line and dials the number.
5-212
#
.