98 Model 57iIP Phone User Guide
Line Keys and Softkeys
5. In the "Line" field, select the line you want to apply to this softkey.
Valid values are 1 through 9.
6. If configuring a softkey on the Bottom Keys, in the state fields, check (enable) or
uncheck (disable) the states you want to apply to this softkey.
7. Click to save your changes.