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BT Versatility
Installation and maintenance Manual
48
Call Barring
Extensions are entered into different Classes for barring purposes. There are 6 classes selected under
'Extension' programming. There are also four tables of codes selected in 'System' programming which
determine additional codes that are barred or allowed:
• Select 'Extensions'
• Select Restriction classes
• Select 'Day class of service' or 'Night class of service'
• Select the class and enter the extensions
• Class 1 is no calls barred
• Class 2 is International calls barred. Also any additional codes added to Table 2 in Class codes
programming are barred
• Class 3 is National and International numbers barred. Also any additional codes in Tables 2 and 3 in
Class codes programming are barred.
• Class 5 is associated with extensions when codes entered in the 'Allowed Table’ in Class codes
programming are to be allowed. This is combined with Classes 2 and 3
• Class 6 is the additional restriction codes in the Restricted Table in Class Codes programming. These
can be combined with Classes 1,2 and 3.
Note: As the BT Versatility can support both ISDN and Analogue, it may be necessary to enable features
for ISDN and Analogue options on the same system.