The NPA Split feature accommodates a growing number of subscribers and the need for new area codes (new NPA). NPA Split refers to the telephone-numbering scheme that subdivides an old area code (old NPA) by the creation of a new NPA. This is necessary when the number of telephone numbers in an old NPA grows to an excessive number. As new NPAs are defined, some existing exchanges (NXX) may be assigned to the new NPA from the old NPA. This feature allows an NPA split to be scheduled in advance of a Permissive Dialing Period (PDP). The split is in the Pending state until it becomes Active on the Start date of the PDP. While in the Active state, Dialed Numbers (DN) in the split's NXX can use either the old NPA or the new NPA. After the split becomes complete on the End date of the PDP, only the new NPA can be used in a DN.
In order to manage NPA splits through the GUI, you must have group permission access to the menu item.