Aastra 6755i User Manual page 158

Programmable Keys
5. Select from "Key 1" through "Key 6"
6. In the "Type" field, select Empty.
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 Empty.
9. Click
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Model 6755i IP Phone User Guide