Aastra 55I IP PHONE - RELEASE 2.1 User Manual page 105

3. In the "Type" field, select Last Call Return.
4. In the "Line" field, select the line you want to apply to this key.
Valid values are 1 through 9.
5. 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.
6. Click to save your changes.
Model 55i IP Phone User Guide 97