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.
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The Headset button light shows the current status as follows: Off: Headset mode off Red on: Headset mode on This feature is not available for the KX-T7665.