Light
Pattern
Line Status Button
Trunk Status
Intercom
Line Status
Incoming
Call
Distribution
Group Line
Status
S-CO G-CO L-CO INTERCOM ICD Group
Slow red
flashing
Another
extension is
holding the
line.
—
Rapid red
flashing
Incoming call to the incoming call distribution
group in Ring distribution method
—
For information on the light patterns of PDN and SDN buttons, refer to 2.9.1 Primary Directory Number
(PDN)/Secondary Directory Number (SDN) Extension.
3. Light Pattern of the Corresponding Extension Status Button
Light Pattern
Corresponding Extension Status Button (DSS)
Off Idle
Red on Busy/Incoming call
*1
/DND for trunk calls
Rapid 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 Patterns
Conditions
• 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 this
case, the DSS button light will not indicate the status of the corresponding extension.
Feature Guide 217
2.21.3 LED Indication