Aastra 6757i CT - Page 159

Model 6757i CT IP Phone User Guide 149
Line Keys and Softkeys
Expansion Module Keys
5. Select from “Key 1” through “Key 36” (M670i)
or
Select from “Key 1” through “Key 60” (M675i)
6. In the "Type" field, select Empty.
7. Click to save your changes.