As your requirements increase, you might want a new set of extensions. Before you can assign a station to an extension, the extension must belong to a range that is defined in the dial plan.
As an example, add a new set of extensions that start with 3 each and are four-digit long (3000 to 3999).
Procedure
Go to the administration interface.
Enter change dialplan analysis or change dialplan analysis location n, where n represents the number of a specific location. Press Enter.
Move the cursor to an empty row.
Type 3 in the Dialed String column. Click Tab to move to the next field.
Type 4 in the Total Length column. Press Tab to move to the next field.
