Method for electrically simulating a cradle switch and a hands free talking-loudspeaking key in a hands free talking-loudspeaking telephone station

A hands free talking telephone station, comprising:

• a subscriber line connecting to an input of a reverse polarity protection device, an output of the protection device connecting to a telephone channel line;
• the telephone channel line connecting to a hands free talking-loudspeaking device and wherein first and second switches are provided in series between the hands free talking-loudspeaking device and said reverse polarity protection device in said channel line;
• a handset, and a change-over means connected for activating either said hands free talking-loudspeaking device or said handset, and also for controlling said second switch;
• an integrated speech circuit connecting to said changeover device;
• a keyboard and an associated dialing store means for abbreviated dialing and automatic redialing;
• a control pulse generator means having a first output connecting to the first switch, a control line connecting to the dialing store means, a second output connecting to the change-over means, another control line connecting to the integrated speech circuit, a first input connecting to a cradle switch contact, and a second input connecting to a hands free talking-loudspeaking key;
• a standby current supply connecting between said telephone channel line and said control pulse generator means;
• an electronic switch controlling a light and controlled by the keyboard and associated dialing store means;
• said control pulse generator means actuating said first switch to connect power from the subscriber line to the station when said handset is lifted or when said hands free talking-loudspeaking key is briefly actuated, during subscriber dialing said control pulse generator means controlling said first switch to interrupt the channel line in accordance with pulse dialing at said keyboard and also controlling the electronic switch and connected light via the keyboard and dialing store means in accordance with the pulse dialing, and said control pulse generator means controlling the change-over device such that the change-over device connects the hands free talking-loudspeaking device with the power on the telephone channel line by controlling the second switch given actuation of said hands free talking-loudspeaking key;
• and
• said standby current supply being connected such that in a rest state the control pulse generator means, the keyboard, and the associated dialing store means are supplied with supply voltage from said standby current supply.