P0992638 03 Modular ICS 6.0 Installer GuideControlling system accessModular ICS programming provides several ways ofprotecting your Norstar system from unauthorized access oruse. These features are used in combination to provide controlboth to users and to lines.Class of ServiceClass of Service (COS) refers to the capabilities that Norstarprovides to users who access the system from the public orprivate network. A password defines which set of capabilitiesthe user is to have access to.The COS includes:• filters that restrict dialing on the line• an access package defines the set of line pools that may beaccessed and whether or not the user has access to thepaging featureThe COS that is applied to an incoming remote access call isdetermined by:• the filters that you apply to the incoming trunk• the Class of Service password that the caller used to gainaccess to the Norstar systemIn cases where DISA is not automatically applied to incomingcalls, the remote caller can change the COS by dialing theDISA DN and entering a COS password.To program COS passwords, see Passwords on page 382 andthe Modular ICS 6.0 System Coordinator Guide.
