Abstract: A method for operating dial-operated telecommunication exchanges equipped with broadcast devices to make conference connections is described. Responsive to signals emitted from a calling subscriber, a conference switching device assigned to the broadcast device is activated; the conference switching device completes the connection in accordance with the switching information contained in the aforementioned signals. The connection is completed as a conventional conference connection in which all participating called subscribers receive all transmitted messages, as a semi-conference connection wherein messages transmitted by each called subscriber are received only by the calling subscriber or as a sub-conference connection wherein messages transmitted by the calling subscriber are received only by a specific called subscriber and messages transmitted by the latter are received only by the calling subscriber.