3-12 Features
C3 Features
Flow chart of Call Barring
The user makes a toll call.
No or Equal
Yes
No
Is it a System Speed Dialling number?
What is the
COS number?
The call is allowed.
Is the COS number higher than the
system speed dialling boundary class?
*1
Is the dialled number found
in applicable denied codes?
*2
Yes
COS2 - 5
Is the dialled number found in
applicable exception codes?
The call is denied. A reorder
tone is returned to the user.
Yes
Yes
No
No
COS1
*1: System Speed Dialling
numbers are assigned in
program [001] “System
Speed Dialling Entry”.
*2: The system speed dialling
boundary class is assigned in
program [301] “Call Barring
– System Speed Dialling
Boundary Class”.
Denied Calls Excepted Calls
1
2
3
4
5
No restriction.
20 denied codes programmed in [302].
20 denied codes programmed in [302] plus
20 denied codes programmed in [303].
20 denied codes programmed in [302] plus
20 denied codes programmed in [303] plus
20 denied codes programmed in [304].
20 denied codes programmed in [302] plus
20 denied codes programmed in [303] plus
20 denied codes programmed in [304] plus
20 denied codes programmed in [305].
No restriction.
80 exception codes (code numbers 01-80)
programmed in [306].
60 exception codes (code numbers 01-60)
programmed in [306].
40 exception codes (code numbers 01-40)
programmed in [306].
20 exception codes (code numbers 01-20)
programmed in [306].
COS No.
Combination of denied codes and exception codes
PSQX1708ZA-04E.QX 99.10.15 10:31 AM Page 12