Mechanical Lifter Jabra GN1000 + Wireless Headset
glue the lifter under the handset
plug cable from lifter to the headset's base to socket AUX
unplug cable which directs from handset to body of the phone and plug it to headset's base (to the socket with phone icon). In this state, when handset is not plugged to the phone (only 'lies' on it) are headset and lifter fully functional (of course phone's handset will not work). If you want to use even classic handset besides headset, it possible to connect headset's base with handset using another cable.