Before you assign a telephone to an extension, ensure that the extension belongs to a range that is defined in the dial plan. The following sample procedure describes how to add a new set of extensions that start with 3 and are 4 digits long. The extension range is from 3000 to 3999.
Procedure
Type change dialplan analysis.
Press Enter.
The system displays the Dial Plan Analysis Table screen.
Move the cursor to an empty row.
In the Dialed String column, type 3. Press Tab to move to the next field.
In the Total Length column, type 4. Press Tab to move to the next field.
