Modify NPA/NXX Tables

To make changes to the NPA (area code) and NXX (3-digit prefix) tables.

  1. From the Main Menu, select (S) System Maintenance, (R) Reconfiguration, (M) Restriction COS, (M) Modify selected RCOS, and then (T) Modify NPA/NXX Table.

  2. Select (P) Select NPA and enter the number of the NPA to add.

  1. To create/modify an associated NXX table, if necessary, select (N) Add NXX and enter the number(s) of prefix(es) to be added.  NXX numbers can be entered in the following formats:

  1. To remove prefixes that you no longer need screened, select (D) Remove NXX and enter the number(s) of prefix(es) to be removed.

  2. Select (B) Set NXX Screening to Allow/Disallow and  A for Allow, or D for disallow.

  3. To verify your changes, select (S) Show Table. The system displays your table and options.

  4. To add another NPA, repeat this process starting from step 2.

  5. Exit the RCOS Menu to save your changes.