Mitel 2700-1398-B1 Sequence of NPA/NXX Screening

Mitel NuPoint Messenger Technical Documentation - Release 7.0

Starting digit position of NPAEnding digit position of NPA

Starting digit position of NXX

Ending digit position of NXX

Home NPA

Check/do not check numbers without absorb digits

Absorption digit patterns

Exact match numbers

Exact match number patterns

NPA screening

NXX screening

None

Do not check

None

Disallow

None

Disallow

Sequence of NPA/NXX Screening

Without NPA/NXX call screening, the system restricts outdials only by the number of digits to be

dialed. With NPA/NXX call screening, the system restricts the outdial capabilities for a mailbox by

allowing calls to be made only to certain area codes or to certain prefixes within an area code.

The system prioritizes the screening process in the following manner:

1. Removes the absorption digits (numbers at the beginning of the dial string that allow access

to outside lines) from the dialing string prior to the screening process. These numbers were

entered in the Digit Absorption Table, one of the RCOS menus.

2. Compares the number called to the Exact Match Table, one of the RCOS menus, which

specifies whether the number is allowed or disallowed. Table 8-9 shows the screening

method.

3. Counts the remaining number of digits. If the dial string does not contain an NPA (area

code), it adds the home NPA.

4. If the system does not receive an exact match for the dial string, it then continues with the

NPA/NXX screening.

5. Passes the NPA to the NPA Table, one of the RCOS menus, and determines if the area code

is allowed or disallowed. Table 8-10 shows the screening method.

6. If the NPA contains an NXX Table, another RCOS menu, the system disregards the selection

of the allow or disallow status for the area code. The determination of whether to allow the

call is based only on whether the prefix is allowed or disallowed in the NXX Table.

7. Screens the number with the NXX table. Table 8-11 shows the screening method.

8. Allows the number or notifies the mailbox owner that the number is not within the mailbox

owner’s calling area.

Table 8-9 Exact Match Number Table

Is the number in the

table? If the table is to allow the

call, the system... If the table is to disallow

the call, the system...

Yes Allows the call Blocks the call

No Blocks the call Allows the call

Table 8-10 NPA Table

Is the NPA in the table? If the table is to allow the

call, the system... If the table is to disallow

the call, the system...

Yes Checks for NXX table. If

no NXX table exists,

places the call.

Blocks the call