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1.8 Toll Restriction (TRS)/Call Barring (Barring) Features
102 Feature Guide
1.8 Toll Restriction (TRS)/Call Barring (Barring)
Features
1.8.1 Toll Restriction (TRS)/Call Barring (Barring)
Description
TRS/Barring can prohibit an extension user from making certain trunk calls by COS
programming. It is applied when the user goes off-hook, a trunk is seized and then a dialled
number is sent to the trunk.
Each COS is programmed to have a TRS/Barring level for each time mode (day/lunch/break/
night).
There are seven levels available. Level 1 is the highest level and the level 7 is the lowest. That
is, level 1 allows all trunk calls and level 7 prohibits all trunk calls. Levels 2 through 6 are used
to restrict calls by combining preprogrammed Denied and Exception Code Tables.
Denied Code Tables
An outgoing trunk call made by an extension with a level between 2 and 6 is first checked
against the applicable Denied Code Tables. If the leading digits of the dialled number (not
including the Trunk Access number) are not found in the table, the call is made. There are five
Denied Code Tables for Levels 2 through 6 respectively.
Complete every table by storing numbers that are to be prohibited. These numbers are defined
as denied codes.
Exception Code Tables
These tables are used to override a programmed denied code. A call denied by the applicable
Denied Code Tables is checked against the applicable Exception Code Tables, and if a match
is found, the call is made.
There are five Exception Code Tables for Levels 2 through 6 respectively.
Complete every table by storing numbers that are exceptions to the denied codes. These
numbers are defined as exception codes.
TRS/Barring Override by System Speed Dialling
If the call is made using System Speed Dialling, the call can override the TRS/Barring. Each
COS is programmed to have a TRS/Barring level for System Speed Dialling ( TRS/Barring
Override by System Speed Dialling [300]).
Once this feature is set, it permits all extension users to make System Speed Dialling calls with
the level for System Speed Dialling. Any extension which sets Extension Lock can also make
a call using System Speed Dialling.