How to prevent ringing of multiple subscribers in private switching systems

摘要

end. TECHNICAL FIELD OF THE INVENTION;Ring transmission control method for incoming call of multiple subscribers in private switching system;I. Technical Problems to be Solved by the Invention;The private switching system controls ring transmission when multiple subscribers are ringing.;All. The point of the solution of the invention;The multiple subscriber stations of the private switching system output a message informing the reception of the incoming call to the display unit without sending out the ring signal for the incoming telephone number of the telephone number for which the ring protection function is set among the telephone numbers of the multiple subscribers, It is possible.;la. Important Uses of the Invention;In the private switching system, the ring can be prevented from ringing depending on whether the ring prevention function is set upon reception of a call, and a response to the incoming call can be made in the ring prevention state.