AT&T MERLIN 3070 Administration Manual page 110

Initial Feature Assignments for Nonattendant Voice Terminals
with 1520 Configuration in Standard Square Systems
*
Your system assigns your first eight lines
automatically to positions above the dial pad.
You must assign the remaining lines to the but-
tons to the right of the dial pad. The numbers
in the lower right-hand corner of each button
show the order in which lines are assigned to
buttons. If you don't use a button for a line,
you can program a feature on the button.
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