Aastra Telecom 6755i - Manual (Page 118)

110 Model 6755i IP Phone User Guide
Line Keys, Programmable Keys, and Softkeys
Programmable Keys
5. Select from "Key 1" through "Key 6"
6. In the "Type" field, select "Flash".
Expansion Module Keys
7. Select from “Key 1” through “Key 36” (M670i)
or
Select from “Key 1” through “Key 60” (M675i)
8. In the "Type" field, select "Flash".
9. (M675i) In the "Label" field, enter a label to display on the phone for the key.
10. Click to save your changes.