The LED (Light Emitting Diode) of the Message/Ringer Lamp and the following buttons (Line Status Buttons
and 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), INTERCOM

Corresponding Extension Status Button: Direct Station Selection (DSS)

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: Off

Type

Description

Ringback Tone

Indicates the call is being received at the called party's extension.

Confirmation Tone

Indicates the called party has set voice-calling.

Busy Tone

Indicates the called party's extension is busy.

DND Tone

Indicates the called party has set Do Not Disturb (DND).