Using Restriction Filters To Bar Calls - Nortel Norstar System Administration Manual

80 Barring calls and privileges (Restrictions)

Using restriction filters to bar calls

Default filters
Compact Plus System Administration Guide
Restrictions are digits that the system does not accept during
dialling. Overrides are digits that the system accepts in spite of
the restrictions. Groups of restrictions and overrides are
programmed into restriction filters.
Rather than define individual restrictions and apply them
repeatedly to each telephone and line, a restriction filter allows
you to apply restrictions as a single package of dialling sequences
that are not permitted.
Different filters can be applied to
• lines, to prevent telephones that share a line from dialling
restricted numbers
• extensions, to prevent a specific telephone from dialling
restricted numbers
• a combination of line and extension, to allow specific
telephones to be exempt from the line filter
For example, a manager and four employees share a line but
the employees have a line/extension filter that restricts the
calls they can make on that line.
• AC15A private circuits, to prevent people from using your
network to make restricted calls
The number of restriction filters that you have for your system
depends on a number of factors. You may want to have different
restrictions for different times of the day (such as barring
long-distance calls after work hours). You may want different
restrictions for a telephone that clients may use.
You may not have to create or change a filter. Some of the more
popular filters that restrict long-distance calls exist by default.
The following table shows the default restriction filters that the
Compact Plus system provides.
Filter 01 prevents you from dialling any number that begins with
0 or 1, except when the number begins with 0-800.
Filter 05 prevents you from dialling any number that begins with
010, 1, and 00.
Filter 06 prevents you from dialling numbers that begin with any
digit.
P0607114 Issue 01