A disallowed numbers lists specifies telephone numbers that extensions associated with the list cannot dial. You can create up to eight disallowed number lists each containing up to 10 telephone numbers.
For example, you may want to prevent calls to a specific telephone number or to categories of numbers, such as international numbers.
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A Disallowed Phone Number can be up to 12 digits long and may include 0–9 or a wildcard ? character to represent any digit.
When a user dials a number that is on a disallowed list, they hear an intercept tone (fast busy signal) after dialing the part of the number that is stored in the list.
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To restrict dialing specific telephone numbers, enter the telephone number exactly as you would dial it. For example, to prevent calls to the local number 555-5678, enter 5555678.
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To restrict dialing numbers in an entire area code, enter that area code exactly as you would dial it; for example, 900, 1900 or 0900 depending on the Toll Call Prefix required. This setting tells the system whether a 0 (for operator-assisted calls) or a 1 (for direct-dial calls) is required when you make toll calls.
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To prevent dialing all telephone numbers in one exchange when a toll prefix is required:
Entry
Restriction
976
Prevents local calls.
1???976
Prevents direct-dial calls to the specified exchange in all area codes.
0???976
Prevents operator-assisted calls to the specified exchange in all area codes.
1976
Prevents direct-dial toll calls in the same area code. This is needed only when 0 or 1 is required for toll calls in the same area code.
0976
Prevents operator-assisted toll calls in the same area code. This is needed only when 0 or 1 is required for toll calls in the same area code.
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To prevent dialing all telephone numbers in one exchange when no toll prefix is required:
Entry
Restriction
976
Prevents local calls.
?0?976
Prevents calls to area codes with 0 as the second digit, such as 203.
?1?976
Prevents calls to area codes with 1 as the second digit, such as 212.
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To prevent international calls, enter the international prefix number, 011.
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To prevent the use of all star codes enter *.
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To prevent the use of a specific star code, for example *67 to block Caller ID information, enter the * plus the 2- or 3-digit code.
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The entries you must make to permit or restrict toll calls differ depending on the setting for Toll Call Prefix.
1408/1416/9404/9408/9504/9508 Phone
1.
At either of the first two extensions on the system, with the phone idle, press Admin.
2.
Use the up or down arrow buttons to scroll the display to System Administration. When shown, press Select.
3.
Use the up or down arrow buttons to scroll the display to Restrictions/Permissions. When shown, press Select.
Use the up or down arrow buttons to scroll the display to Allowed Lists. When shown, press Select.
5.
At the List Number: prompt enter 1 to 8 for the list you want to edit.
6.
At the Entry: prompt enter the list entry you want to change by entering 01 to 10.
7.
The current setting is displayed.
8.
Enter the new number and press Enter. To enter a wildcard digit press HOLD. Press Clear to remove the existing number.
9.
Use the up or down arrow buttons to scroll through the other numbers in the list.
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Exit programming by pressing PHONE/EXIT. Alternatively use the Back button to move to another menu.
M7324/M7324N/M7310/M7310N/T7316/T7316E Phone
1.
At either of the first two extensions on the system, with the phone idle, press Feature **config (ie. Feature **266344).
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If the system has a system password set, it is requested. Enter the password.
2.
The phone displays System Admin.
3.
Dial #404. The phone displays Disallowed Lists.
4.
At the List Number prompt, enter a list number 1 to 8.
5.
At the Entry prompt, select a list entry 01 to 10.
6.
Enter the first telephone number. To save the telephone number in memory, press Enter. Do one of the following:
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To delete the telephone number you just entered, press Remove.
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To add other telephone numbers to this list, press Next Item and repeat Steps 6 and 7.
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To create another list, press Next Procedure + Prev Procedure and go to Step 5.
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To exit phone based administration at any time, press the Release button. To select a different process use the Next Procedure or Previous Procedure buttons or dial another feature code.
ETR 18D/ETR 34D Phone
1.
At either or the first two extensions on the system, with the phone idle, press Feature 0 0 followed by two presses of the first intercom or call appearance button.
2.
System Administration: is shown on the display.
3.
Dial #404. The phone displays Disallowed Lists.
7.
At the List Number prompt, enter a list number 1 to 8.
8.
At the Entry prompt, select a list entry 01 to 10.
9.
Enter the first telephone number. To save the telephone number in memory, press Enter. Do one of the following:
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To delete the telephone number you just entered, press Remove.
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To add other telephone numbers to this list, press Next Item and repeat Steps 6 and 7.
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To create another list, press Next Procedure + Prev Procedure and go to Step 5.
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Exit programming by pressing Feature 00. You can also exit programming mode by lifting the handset, then placing it back in the cradle.
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up or down 
arrow buttons to scroll the display to System Administration. When shown, press Select.
Feature **config (ie. Feature **266344).