Panasonic KX-NCP500 Operating Manual page 91

Headset Operation
You can have a conversation using a headset.
In this case, you must select "Headset on" in programming mode or set the Headset button
on (red) in advance.
This feature is also known as Handset/Headset Selection.
To talk using the headset
PT
SP-PHONE
Press SP-PHONE.
To use the handset during a conversation using the headset
PT
Off-hook.
To talk in hands-free mode during a conversation using the headset
PT
(Headset)
Press red Headset.
•
The Headset button light shows the current status as follows:
Off: Headset mode off
Red on: Headset mode on
Document Version 2013-05
1.3.33 Headset Operation
Operating Manual 91