How do i connect headset to panasonic kx-t7433

Just connect the pre existing speaker or earpiece through a newly installed E.P. socket.Whenever headset is connected to the E.P. socket, internal speaker will be disabled and external will be enabled. Same you have to do in the case of mic.Some more details are given below.
1.E.P. Socket = Earphone Socket ( With Series Switch, A SPDT switch is already attached to the inner side of the socket, whenever an E.P. Pin / Plug is inserted into the socket, It changes the position of the SPDT switch).
2.The inner speaker / earpiece / mic should be connected through the N/C ( Normally Connected ) Contact of the socket.