AT&T MERLIN LEGEND Release 2.0 Analog Direct-Line Console Operator's Manual page 79

Features
To Change Extension Status from a
Single-Line Telephone
1. Lift handset.
2. Dial one of the following
3. Hang up.
To Change Extension Status from a
Multiline Telephone
1. Press the
handset.
2. Dial one of the following:
Extension Status
4-30
#45 for ES1
#44 for ES2
programmed Feature button without lifting
45 for ES1
44 for ES2