Aastra Telecom 6757I 用户手册
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Model 6757i IP Phone User Guide
Line Keys and Softkeys
Expansion Module Keys
4. Select from “Key 1” through “Key 36” (M670i)
or
Select from “Key 1” through “Key 60” (M675i)
Select from “Key 1” through “Key 60” (M675i)
5. In the "Type" field, select None.
6. Click
to save your changes.