Panasonic KX-TD816NZ - Manual (Page 32)

2.2 Making Calls
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Operation
• 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 4.1.1 Customising Your Phone (Station Programming).
Customising Your Phone
• 4.1.3 Customising the Buttons
Create or re-arrange a Phantom extension button.