The operation for each of these buttons apply to all endpoints supporting the button. If the button or service is not supported, it might still be available using the Flexible Feature Code (FFC) operations.

The FFC is the same functionally as a Feature Access Code (FAC) of Communication Manager. To the endpoint user, the name change from FFC on CS 1000 to FAC on Communication Manager is invisible, although knowing it is configured as the FAC is crucial for the administrator.