Using Auto Discover for Initial System Configuration 95Disabling the AutoDiscover FeatureAfter you finish the Auto Discover process for the initial configuration,you can disable it so that the Call Processor does not continue to searchfor added devices. To disable the Auto Discover feature:1 Log in to the NBX NetSet utility using the administrator username andpassword.2 In the NBX NetSet - Main Menu window, click System Configuration.3 Click System-wide.4 Clear all Auto Discover check boxes.5 Click Apply.6 Click OK to close the dialog box.Configuring theOperating ModeYou can configure the NBX system to behave in one of the threetraditional telephone system modes:■ Key modeCO lines map to individual buttons on users’ telephones. To configurekey mode behavior using the NBX NetSet utility, use Button Mappingsand the Auto Extension setting for each line card port. ButtonMappings enable you to map a line card port extension to a specificAccess button on a 3Com telephone. Button Mappings identify thetelephones that ring when a call comes in on the mapped CO line.Auto Extension specifies the destination of a call that is not answeredat any of the telephones.■ PBX modeCO lines are pooled and arbitrated by the Call Processor. The CO linesdo not map to individual telephones. All incoming calls go first to areceptionist’s telephone or the Automated Attendant. If the call goesto a receptionist’s telephone, the receptionist forwards the call to theuser’s extension, or if the user is out of the office, the call can be sentdirectly to the user’s voice mailbox. To call an outside number, a usermust dial the line pool access number, typically 9, and the CallProcessor assigns the next available line. PBX mode allows you tomake maximum use of a limited number of CO lines.■ Hybrid modeCombines key mode and PBX mode. Some CO lines are mappeddirectly to telephones, while the rest are pooled.