Cortelco 2757 - Manual (Page 12)

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2. Press ‘Up’ or ‘Down’ until ‘3. Settings’ is selected, then press ‘Select’.
3. Press ‘Up’ or ‘Down’ until ‘4. System Configuration’ is selected, then press ‘Select’.
4. Press ‘Select’ on ‘1: Network Setting’. Use ‘Up’ or ‘Down’ to change network setting to
‘PPPoE’. Then press ‘Save’.