Panasonic KXTD612NE Operating Guide

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2.2
Making Calls
Operation
39
 To answer
The Phantom extension button light shows the current status as follows:
Off: Idle
Red on: You are calling a phantom extension.
Flashing green: Incoming call
To set ringing or not, refer to "Customising Your Phone".
Customising Your Phone
Create or re-arrange a Phantom extension button.
DPT
Off-hook or 
press Phantom.
OR
(Phantom)