70 Using featuresUsing featuresTo use a feature, enter the feature code and watch yourtelephone display for instructions. Different displays come up atdifferent times, depending on how you invoke the feature and thechoices you make while using the feature. If you want moreinformation about a display, look it up in the Displays section ofeach feature listing.Availability of featuresSome features work only in certain circumstances. For example,Disconnect Supervision must be available and assigned to a lineon your telephone to allow you access to the following features:Line Redirection of an external call to an external numberUnsupervised Conference between two external callsTransfer between two external callsDisconnect Supervision is available when an Open SwitchInterval (OSI) message is provided on a line by the publictelephone system.If Disconnect Supervision is available, your Customer Servicerepresentative assigns Disconnect Supervision to lines inConfiguration programming. When Disconnect Supervision isassigned to a line, the system monitors the length of theOSI on that line to determine when an external caller hangs up.This allows the system to release the line for other uses.The Notes section of each feature listing contains informationconcerning any restrictions affecting the availability of thefeature.Owner’s Handbook PO84262701
