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1.8 Toll Restriction (TRS) Features
Feature Guide 67
1.5.2.7 Host PBX Access Code (Access Code to the Telephone Company from a Host PBX)) or Carrier
Exception code.
• The inter-digit timer ( Inter-digit Time [208]) applies until the TRS check is completed. When the timer
expires, the outgoing outside (CO) line call is disconnected while dialling, if enabled through system
programming ( No Dial Disconnection [211]). For a single line telephone (SLT), an outgoing outside
(CO) line call will be released from the DTMF (Dual Tone Multi-Frequency) receiver when the inter-digit
timer expires.
• TRS—Extension Lock Class
The COS of extensions locked by the Extension Lock or Remote Extension Lock feature ( 1.8.3
Extension Lock) can be assigned ( TRS—Extension Lock Class [312]) so that even a locked
extension can make outside (CO) line calls. The higher COS number will take precedence. If, for
example, COS 3 is assigned to an extension ( TRS-COS—Day/Night/Lunch [601-603]) and the COS
of locked extensions is assigned as "4", when the extension is locked, the PBX allows the extension
user to make outside (CO) line calls using COS 4.
• The PBX can also be programmed to perform a TRS check for numbers that contain nondigits ( or #)
( TRS Check for * and # [125]). If TRS check is disabled, the PBX ignores any nondigits that are
dialled when checking, which is useful in preventing some unauthorised calls.
Feature Guide References
1.6.1.5 Speed Dialling—Personal/System
2.2.1 Class of Service (COS)
Access Code Type
Access Code is stored in the PBX
Access Code is not
stored in the PBX
Access Code is dialled
Access Code is not
dialled
Host PBX Access
Code*
1
TRS ignores the code
and checks the
remaining digits.
Number dialled is not an
outside (CO) line call, so
TRS does not check the
number.
TRS checks the entire
number.
Carrier Exception
Code*
2
TRS ignores the code
and checks the
remaining digits.
TRS checks the entire
number.
TRS checks the entire
number.
*
1
Host PBX Access Code [403]
*
2
Carrier Exception Code [300]