Telegraphy – Systems – Automatic
Patent
1975-12-22
1977-05-31
Robinson, Thomas A.
Telegraphy
Systems
Automatic
179 18BC, H04L 1100
Patent
active
040270980
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.
REFERENCES:
patent: 3504130 (1970-03-01), Gorgas et al.
patent: 3515807 (1970-06-01), Clark
patent: 3697672 (1972-10-01), Reisch
patent: 3912874 (1975-10-01), Botterell et al.
Giersberg Dieter
Reisch Hans
Lett Gerald L.
Robinson Thomas A.
Siemens Aktiengesellschaft
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