Patent ID: 8233410
Filing Date: 2012-07-31
Classification: H04M

Abstract:
1. A telephone system that implements a group call, the system comprising: a conference trunk creating unit that performs a conference trunk process as a virtual conference trunk by running a software program which corrects and synthesizes voices from plural terminals in accordance with an instruction; and a control unit that prestores a unique number of a group call and the numbers of plural terminals belonging to the group call, when the unique number of the group call is called, outputs an instruction to perform a conference trunk process to the conference trunk creating unit, calls the terminals belonging to the group call on the basis of the stored number, connects the calling terminal and OFF hooking terminals to the conference trunk process and starts the group call, wherein after plural group calls start by plural conference trunk processes, if the control unit receives the input of a multiplex request to multiplex the plural group calls, the control unit outputs an instruction to perform a conference trunk process for multiplexing to the conference trunk creating unit, and switches and connects the terminals participating in the plural group calls from the plural conference trunk processes to the conference trunk process for multiplexing.