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1.8 Toll Restriction (TRS) Features
66 Feature Guide
[Flowchart]
Conditions
WARNING
The software contained in the TRS 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 on-premise PBXs or peripheral equipment to recognise the new codes as
they are established will restrict the customer and users of the PBX from gaining access to the
network and to these codes.
KEEP THE SOFTWARE UP TO DATE WITH THE LATEST DATA.
• Emergency numbers, such as the police or fire services, should be stored ( Emergency Number
[309]) so that they are not barred by TRS.
• Host PBX Access Code/Carrier Exception Code
TRS checks can be carried out on telephone numbers dialled using a Host PBX Access code (
An extension user tries to make
an outside (CO) line call.
Was the number dialled using
System Speed Dialling?
What is the COS number?
Is the dialled number found in an
applicable Denied Code Table?
Is the dialled number found in an
applicable Exception Code Table?
The call is denied.
The user hears a reorder tone.
Is the COS number higher
than the System Speed
Dialling Class?
The call is permitted.
Ye s
COS 1
COSs 2–5
No or Equal
Ye s
Ye s
No
Ye s
No
No