Nortel BCM 3.7, Manual

Page: 359 / 1004

Defining restriction filters 359
Programming Operations Guide
• When restricting the dialing of a central office feature code, do not forget to create separate
restrictions for the codes used for DTMF and pulse lines (for example, *67 and 1167).
• Do not string together a central office feature code and a dialing sequence that you want to
restrict. Create a separate restriction for each.
• You can copy restrictions and overrides from one filter to another. You can use a restriction or
override in any number of filters. Each time you use a restriction or override, it counts as one
entry. For example, if restriction 411 exists in filters 01, 02 and 03, it uses up three entries of
the 400 entries available.
• Removing a restriction from a filter has no effect on the contents of other filters, even if the
restriction was copied to them.
• You cannot delete a filter. Removing the restrictions programmed on a filter makes it an
unrestricted filter but the filter itself is not removed.
Default filters (North America)
Filter 00 permits unrestricted dialing and cannot be changed.
Filter 01 is pre-programmed with 10 restrictions and some associated overrides. In Filter 01,
Restriction 02 and Override 001 allow long distance toll free calls.
The dialing string 911, which is the number for emergency assistance in North America, is
included as both a restriction and an override in Filter 01. This arrangement prevents anyone from
blocking calls for emergency assistance on lines or sets using the default filter.
Note: Default filters are loaded only when the system is cold started.
Table 70 Default restriction filters
Filter Restrictions (denied) Overrides
00 Unrestricted dialing
01 01: 0
02: 1 001: 1800
002: 1877
003: 1888
03: 911 001: 911
04: 411
05: 976
06: 1976
07: 1AAA976
01 08: 1900
09: 1AAA900
10: 5551212
02 - 99 No restrictions or exceptions programmed