Method for displaying/communicating data at door intercom and telephone equipment, input of text is either direct at telephone terminal or through text messages through electrical- electromagnetic- or optoelectric-communication devices

摘要

A method for displaying and communicating data at a door intercom, has optical display devices and the user communicates text messages from one other location in an electrical- electromagnetic- or optoelectric-manner to the terminal device and this is then further processed and a display is made visible for the third party.