a telephone , which includes a cpu connected to a keyboard thereof , a first switch connected between first and second telephone lines , second and third switches provided at the first and second telephone lines and connected to the cpu , the second and third switches each having a first contact at the respective output end connected to a fourth switch and a second contact connected to a fifth switch , which controls a hand - free circuit , wherein when the first and second telephone lines are called at the same time , the switches are controlled by the cpu for enabling a first user to pick up one call through the hand - free circuit or talking circuit and a second user to pick up the other call through the talking circuit or hand - free circuit , and a switching can be made through the keyboard to change the connection of the telephone lines between the talking circuit and the hand - free circuit .