1.1 Incoming Call Features
•This feature can also restrict calling a doorphone from an extension on a COS of the extension and a COS of the doorphone port basis. Each doorphone port can be assigned a COS. ( 
1.16.1 Doorphone Call)
Feature Guide
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•This feature can also restrict calling a doorphone from an extension on a COS of the extension and a COS of the doorphone port basis. Each doorphone port can be assigned a COS. ( 1.16.1 Doorphone Call)
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