LightPatternLine Status ButtonTrunk Status IntercomLine StatusIncomingCallDistributionGroup LineStatusS-CO G-CO L-CO INTERCOM ICD GroupRapid redflashingIncoming call to the incoming call distributiongroup in Ring distribution method—For information on the light patterns of PDN and SDN buttons, refer to 1.7.1 Primary Directory Number(PDN)/Secondary Directory Number (SDN) Extension.3. Light Pattern of the Corresponding Extension Status ButtonLight Pattern Corresponding Extension Status Button (DSS)Off IdleRed on Busy/Incoming call*1/DND for trunk callsRapid red flashing Incoming call*2*1 Only when Call Pickup by a DSS button is disabled.*2 Only when Call Pickup by a DSS button is enabled.4. Flashing Light PatternsSlow FlashingModerate FlashingRapid Flashing1 sConditions• The incoming call shows on the buttons in the following priority:ICD Group®S-CO®G-CO®L-CO®PDN®INTERCOM• The light pattern of a DSS button for incoming call can be set to "Off" through system programming. In thiscase, the DSS button light will not indicate the status of the corresponding extension.Feature Guide References1.2.2.2 Group Call Distribution1.2.2.7 Log-in/Log-out1.3.1 Call Forwarding (FWD)/Do Not Disturb (DND)1.13.1 Call Hold1.14.1.2 ConferenceFeature Guide 2031.20.3 LED Indication