Aastra 57i IP Phone User Manual page 62

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
8. Click on Operation->Reset.
9. In the "Restart Phone" field click
54 Model 57i IP Phone User Guide
to save your changes.
to restart the IP phone.