Patent ID: 7430288
Filing Date: 2008-09-30
Classification: H04M,H04Q

Abstract:
1. An exchange including a plurality of line interfaces to be connected with a line wire, and one or more extension interfaces to be connected with an extension, for connecting either the line wire and the extension or the extension and another extension, thereby to form a channel, comprising: a time-division switch for connecting the line wire and the extension and for forming a channel between each other; a memory for grouping at least two telephone numbers of an extension number assigned to the extension and the telephone number of the line wire, into at least one group and for registering the group; and a controller for controlling the exchanging action either between the line wire and an extension or between the extensions, wherein when said controller receives a conference opening demand for a conference communications via a first extension and a group number, said controller: performs a conference calling termination by acquiring the number of other extensions belonging to the same group as that of the first extension having demanded the conference communications, from said memory; and controls said time-division switch so as to establish unidirectional communications from the first extension to the other extensions responding to the conference calling termination.