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58 ♦ Reference
Class of Restriction
Each extension and trunk in the system is assigned a Class of
Restriction. As its name implies, a Class of Restriction (COR) may
restrict an extension (or a trunk) from accessing an external
route at a given time.
The extension’s COR is displayed in the Source or Destination
area of the console screen, along with its Class of Service and the
other information on the caller.
Here are a few examples on how the Class of Restriction can
affect users:
• The extensions with a given COR may not dial outside the
system at all, having to ask the assistance of the attendant
to do so.
• Extensions with another COR may have to go through the
attendant in order to dial long distance.
• Extensions with yet another COR may only dial certain long-
distance numbers and at given times of the day.
• Extensions with the least restrictions programmed could dial
anywhere at any time.
• The extension’s COR may change with Day, Night 1 and
Night 2 services.
• Routing may change according to the time of the day and the
day of the week, indicating different outside dialing privileges
according to the time of dialing.
Class of Service
Not all the features described in this Guide are available on your
console or on other extensions.
An extension’s Class of Service (COS) appears, with the
information about that extension, in the Source or Destination
area of the console screen.
Each COS defines which features an extension or console can
activate. The message “Feature not allowed” appears on the
console screen when you try to access a feature not allowed in
your or the extension’s COS.
Here are some examples of how a COS could affect users:
• COS could change depending on whether the system is in
Day, Night 1, or Night 2 Service.
• Extensions without an appropriate COS could be denied
access to certain features, such as Call Override, Paging
Access or Setting Message Waiting Notification.
• You and other extension users may be required to enter an
Account Code for additional system access or when you want
to use your COS at a different extension.
• Some extension users cannot be overridden.