Aastra Telecom 55i IP Phone - Manual (Page 67)

Model 55i IP Phone User Guide 61
Softkeys and Programmable Keys
2. For softkeys, select from "Key 1" through "Key 20".
or
For programmable keys, select from "Key 1" through "Key 6".
3. In the "Type" field, select Last Call Return.
4. In the "Line" field, select the line you want to apply to this softkey.
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.
7. Click on Operation->Reset.
8. In the "Restart Phone" field click to restart the IP phone.