Configuring system-wide call appearance groups 471Programming Operations GuideFEATURE *537 retrieves the oldest SWCA call. The call becomes active on the telephone thatinvoked the code, and the indicator on all other telephones becomes solid.FEATURE *538 retrieves the most recent SWCA call. The call becomes active on thetelephone that invoked the code, and the indicator on all other telephones becomes solid.Programming SWCA controls for your systemThis section describes the screen where SWCA controls are defined for the SWCA feature.On this screen, you need to determine two things:• You need to determine how calls will be assigned to SWCA keys, and whether you wantintercom (I/C) calls to be treated in the same way.• As well, you need to determine if using the Hold button will interact with the SWCA featuresand with intercom calls, and how.Follow these steps to set the SWCA controls for your system:1 On the navigation tree, click on the keys beside Services, Telephony Services, GeneralSettings.2 Click on Access codes.Figure 159 Checking for Park prefix3 Ensure that Park prefix has a number beside it. If this access code is set to None, SWCA keyswill not work.