Use the COS feature to allow or deny user access to some system features, such as:
Automatic Callback
Call Forwarding
Data Privacy
Trunk-to-Trunk Transfer Override
QSIG Call Offer Originations
Contact Closure Activation
Console Permission
Use the Class of Restriction (COR) feature, instead of COS, to define the restrictions that apply when a user places or receives a call. For more information, see the Class of Restriction feature.
COS does not apply to trunk groups, except for the Remote Access feature. For more information, see the Remote Access feature.