To access the Numbering Plan Area (NPA) Code Opening / Overlay Information (NCO) page, from the Landing page or any page, you can select the Menu icon (in the upper left corner), the “General System Administration” menu item and then the “NPA Code Opening / Overlay” sub-menu item. Once the “NPA Code Opening / Overlay (NCO)” sub-menu item has been selected, the NCO page will be displayed.
The NCO page allows you to retrieve the NCO information. You can view and print the data retrieved on the NCO page.
For more information on how to retrieve the NCO page, please click here, or here for more information on the NCO page's fields, descriptions, and their valid values.