1.8 Toll Restriction (TRS)/Call Barring (Barring) Features

Conditions

WARNING

The software contained in the TRS/Barring feature to allow user access to the network must be upgraded to recognise newly established network area codes and exchange codes as they are placed into service.

Failure to upgrade the premises PBXs or peripheral equipment to recognise the new codes as they are established will restrict the customer and the customer’s employees from gaining access to the network and to these codes.

KEEP THE SOFTWARE UP-TO-DATE WITH THE LATEST DATA.

A COS should be assigned for each extension. ( Class of Service [602])

TRS/Barring checks are applied to the following:

ARS

Trunk Access (Idle Line/Trunk Group/S-CO Line)

It is programmable whether " " or "#" is checked by the TRS/Barring. This is useful in preventing unauthorised calls which could be possible through certain telephone company exchanges.

It is programmable whether TRS/Barring checks the digits dialled after the External Feature Access during a trunk call. ( 1.10.7 External Feature Access (EFA))

Host PBX Access Code/Special Carrier Access Code

TRS/Barring checks for numbers dialled with a Host PBX Access code ( 1.5.4.7 Host PBX Access Code (Access Code to the Telephone Company from a Host PBX)) or a Special Carrier Access code ( 1.5.4.8 Special Carrier Access Code) in the following cases:

Type

Stored

Not stored

 

 

Found

Not found

 

 

 

 

 

 

Host PBX

Deletes the code. A

The call is made

TRS/Barring checks

Access Code

TRS/Barring check is

(excepted from TRS/

the whole number.

 

carried out on the

Barring).

 

 

following digits.

 

 

 

 

 

 

Special Carrier

Deletes the code. A

TRS/Barring checks

TRS/Barring checks

Access Code

TRS/Barring check is

the whole number.

the whole number.

 

carried out on the

 

 

 

following digits.

 

 

 

 

 

 

ARS

If ARS is applied to a dialled number, TRS/Barring will check the user-dialled number (not the modified number by ARS). In this case, a Host PBX Access code and/or a Special Carrier Access code will not be checked.

Dialling Digit Restriction during Conversation

The dialling of digits can be restricted while engaged on a received trunk call. If the number of dialled digits exceeds the preprogrammed limitation, the line will be disconnected.

A TRS/Barring level can be changed by some features. The priority of features, when multiple features are used, is as follows:

1)Dial Tone Transfer ( 1.8.4 Dial Tone Transfer)

2)Budget Management ( 1.8.2 Budget Management)

3)TRS/Barring Override by System Speed Dialling

Feature Guide

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