1.18 Proprietary Telephone (PT) FeaturesFeature Guide 1371.18.3 LED IndicationDescriptionThe LED (Light Emitting Diode) of the Message/Ringer Lamp and the following buttons (Line Status Buttonsand Corresponding Extension Status Button) can indicate line status with a variety of light patterns.Line Status Buttons: Single-CO (S-CO), Group-CO (G-CO), Other-CO (O-CO), INTERCOMCorresponding Extension Status Button: Direct Station Selection (DSS)1. Light Pattern of the Message/Ringer Lamp• Incoming call from an outside (CO) line/another extension: Red flashing• Message(s) present (no incoming call): Red on• No messages present and no incoming call: Off2. Light Pattern of the Line Status ButtonsIntercomLine StatusOutside (CO) Line StatusLine StatusButtonRed onOffGreen onLightPatternSlow greenflashingModerate–speed greenflashingRapid greenflashingSlow redflashingS-CO G-CO O-CO INTERCOMIdleThis extension is using the line.This extension is holding the line.This extension is holding the line using Exclusive Call Holdor using the line for an unattended conference.Incoming callAnother extensionis holding the line.–– – –Rapid redflashingIncoming call –– – –Line(s) in use
