FIELD: communication systems with many users. SUBSTANCE: invention is specifically related to private communication network of type " from one point to aggregate of points " placed directly into cellular communication system or wire telephone communication system. Given private communication network used by aggregate of users communicates with employment of public telephone network. Each participating user employs modified ground wire telephone set directly connected to public telephone network or modified mobile telephone set timely connected to public telephone network via radio communication system. Private communication network includes administrator of network calls incorporating interface of telephone network to establish telephone communication with each of aggregate of telephone lines of public telephone network. Each telephone line of the aggregate is coupled to one of aggregate of participants-users. Administrator of network calls includes in addition switching matrix connected to interface of telephone network to transmit information signal received from active participant-user over selected telephone line to rest of inactive participants-users. EFFECT: avoidance of preliminary coordination with supplier of telephone service, increased degree of protection of communication system. 29 cl, 8 dwg
