
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
•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 | ||
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Found | Not found | |||
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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). |
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| following digits. |
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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 |
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| following digits. |
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•ARS
If ARS is applied to a dialled number, TRS/Barring will check the
•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
105