Thanks to Owner-Manuals.com! This manual was exactly what I needed. As Amana was purchased by Maytag and later by Whirlpool, there was no way to receive it from their websites. I was lucky to find this resource.
Great to be able to set channels again, on an old but stoll fine working TV
Text excerpt from page 79 (click to view)
1.4 During a Conversation
1.4.8
Using the Headset (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.
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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.