Note:
To assign an extension to the user, perform one of the following actions:
Assign an available extension to the user, select the Use Existing Extension check box, and select an unassigned extension from the drop-down box.
Or assign an available module-port to the user from the Module-Port drop-down box, and type the new extension. The module-port combination is valid only when you associate a digital or an analog extension type to the user.
To assign an extension to a user with other set types, perform one of the following actions:
Type an appropriate extension.
Select the Use Existing Extension check box to choose an existing extension.
Select an unassigned extension from the drop-down field.