Your description of how the phones operate when the handset is plugged into the headset jack is correct and normal for that scenerio

I've seen phones go to HF when you lift the handset (plugged into handset jack) AND press a line or intercom... the phones have defective hook switches.


Marv CCNA, CTUB
TeleMarv Services (Retired)
Providing telecommunication solutions in Ottawa Canada since 1990