2.21.3 LED IndicationDescriptionThe LED (Light Emitting Diode) of the Message/Ringer Lamp and following buttons (Line Status Buttons andCorresponding Extension Status Button) show line conditions with a variety of light patterns.Line Status Buttons: S-CO, G-CO, L-CO, INTERCOM, ICD Group, PDNCorresponding Extension Status Button: DSS, SDN1. Light Pattern of the Message/Ringer Lamp[IP-PT and DPT]• Incoming call from a trunk: Red flashing• Incoming call from another extension: Green flashing• Message(s) present (no incoming call): Red on• No message(s) present (no incoming call): Off[APT]• Incoming call: Red flashing• Message(s) present (no incoming call): Red on• No message(s) present (no incoming call): Off2. Light Pattern of the Line Status ButtonsLightPatternLine Status ButtonTrunk Status IntercomLine StatusIncomingCallDistributionGroup LineStatusS-CO G-CO L-CO INTERCOM ICD GroupOff IdleGreen on This extension is using the line.Slow greenflashingThis extension is holding the line.ModerategreenflashingThis extension is holding the line using Exclusive Hold or using the line for anUnattended Conference.Rapid greenflashingIncoming call/PrivacyReleaseIncoming callRed on Incoming callfor anotherextension/Anotherextension isusing the line/Anotherextension hasthe line onExclusiveHold.Otherextensionsare using alltrunks in thetrunk group.— Thisextension islogged out ofthe incomingcalldistributiongroup.254 Feature Guide2.21.3 LED Indication