Call-center telephone system, privacy telephone communication method, and nontemporary computer readable medium on which privacy telephone communication program has been stored

摘要

When, in order to convey an advice or the like to an operator from a supervisor, a two-party telephone communication connection state between a customer terminal connected to an outside line (3) side of a private branch exchange and an operator terminal (10) is changed to a three-party telephone communication connection state among the outside line (3), the operator terminal (10) and the supervisor terminal (20) by use of a conference trunk (52) provided in the private branch exchange, the three-party telephone communication connection state is established by connecting a transmission line (31) of the outside line (3), a first transmission line (11) that is one of two transmission lines provided to the operator terminal (10), a reception line (13) also provided to the operator terminal (10), a transmission line (21) of the supervisor terminal (20) and a reception line (22) of the supervisor terminal (20) to any conference trunk (52) that is captured from unused-state conference trunks and further by connecting a second transmission line (12), which is the other of the two transmission lines of the operator terminal (10), to a reception line (32) of the outside line (3).