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Click the Start button, and then click Control Panel.
In Control Panel, make sure you are in Classic View, with all Control Panel icons showing. If not, click Switch to Classic View in the left pane of Control Panel.
Click Accessibility Options to open the Accessibility Options dialog box. Click the Mouse tab. Turn on MouseKeys by selecting the Use MouseKeys check box.
Click Settings. In the Setting for Mousekeys dialog box, click the options you want.
Click OK, click OK again, and then click Close to close Control Panel.
Login into the phone switch with your username and password
Type "CNFG"
Type "MOD EXTEN"
It should then let you change anything about the extension you want to.
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