# Configure an RCOS

You must configure the RCOS System-wide parameters before you can use an RCOS.

To configure an RCOS:

1. Complete an RCOS Worksheet. (Blank worksheets are here.)

2. From the Main Menu, select (S) System Maintenance, (R) Reconfiguration, and then (M) Restriction COS.

3. Select (A) Select RCOS and enter the n umber (1 through 64) of the RCOS group to be modified.

4. Select (M) Modify Selected RCOS.

5. Select (N) Name of Selected RCOS and enter a descriptive name (up to 15 characters)

6. Select (H) Home NPA and enter the n umber of the NPA (1- to 3-digit number representing area code).

7. Select (C) Check Numbers Which Do Not Have Absorb Digits and enter Y to continue screening the numbers, or N to skip screening and allow call placement unconditionally.

8. Select (M) Modify Digit Absorption Table if you need to specify digits to be absorbed. (Refer to your RCOS worksheet.)

9. Select (A) Add a number and enter the number to be absorbed in one of the following formats:

   - a single pattern (for example 91)

   - a series of patterns separated by commas (for example, 91,1,102880). Do not enter spaces after the commas and do not end the entry with a comma.

10. Press Enter to exit the add menu and then press (X) to exit the Absorb menu.

11. In the Modify RCOS menu, select (A) Set Exact Match Numbers to Allow/Disallow if you want to set up an Exact Match database:

12. Enter A to allow these numbers or D to disallow them.

13. Select (E) Modify Exact Match Table.

14. Select (A) Add a number and enter the number to be matched against. Number patterns can be entered in the following formats:

    - A single pattern, for example, 5551212,

    - A series of patterns, for example, 911,411. Do not enter spaces after commas and do not end the entry with a comma.

    - Press Enter to exit the add menu and then press (X) to exit the Exact Match menu.

15. In the Modify RCOS menu, select (S) Set NPA Screening to Allow/Disallow if you want to set up an NPA Database.

16. Enter A to allow these numbers, or D to disallow them.

17. Select (T) Modify NPA/NXX Table.

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

19. Select (A) Add NPA. The system confirms the addition.

20. Select (N ) Add NXX if you want to set up an NXX Database.

21. Select (B) Set NXX Screening to Allow/Disallow and enter A to allow these numbers, or D to disallow them.

22. Select (X) to exit the NPA/NXX menu.

23. You can verify your changes using the instructions to View RCOS Information.

24. Exit the Restriction Class of Service Menu to make the changes take effect.

25. Copy the number of this RCOS from your RCOS Worksheet to the appropriate mailbox worksheet.