AT&T MERLIN LEGEND MLX-10D User Manual page 38

Your Display Telephone
555-1234. Use any button labeled with a phone number to
make or receive outside calls only.
line because it appears only on your phone or a particular
group of phones.
Use buttons labeled with special service names like
WATS.
to
WATS make and receive outside calls
This is called a personal
at a reduced cost.
Line Buttons
1-23