1.1 General Features
150 Feature Manual
Conditions
WARNING
The software contained in the TRS feature to allow user access to the network must be upgraded to
recognize 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 recognize 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.
• TRS—Extension Lock Class
The COS of extensions locked by the Extension Lock or Remote Extension Lock feature ( 1.1.55
Extension Lock, 1.1.107 Remote Extension Lock) can be assigned ( [312] TRS—Extension Lock
Class) 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 ( [601-603] TRS-COS—Day/
Night/Lunch) 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.
• Emergency numbers, such as the police or fire services, should be stored ( [309] Emergency
Number) so that they are not barred by TRS.
• Host PBX Access Code/Carrier Exception Code
TRS checks can be carried out on telephone numbers dialed using a Host PBX Access code ( 1.1.65
Host PBX Access Code (Access Code to the Telephone Company from a Host PBX)) or Carrier
Exception code.
• The inter-digit timer ( [208] Inter-digit Time) applies until the TRS check is completed. When the timer
expires, the outgoing outside (CO) line call is disconnected while dialing, if enabled through system
programming ( [211] No Dial Disconnection). 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.
• The PBX can also be programmed to perform a TRS check for numbers that contain nondigits ( or #)
( [125] TRS Check for * and #). If TRS check is disabled, the PBX ignores any nondigits that are
dialed when checking, which is useful in preventing some unauthorized calls.
Access Code Type
Access Code is stored in the PBX
Access Code is not
stored in the PBX
Access Code is dialed
Access Code is not
dialed
Host PBX Access
Code*
1
TRS ignores the code
and checks the
remaining digits.
Number dialed 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
[403] Host PBX Access Code
*
2
[300] Carrier Exception Code
