Patent ID: 8488468
Filing Date: 2013-07-16
Classification: H04L,H04M

Abstract:
1. A conference server connected to a call control server which relays a request for call control of a group conference system and a plurality of terminal devices, comprising: a session shift control unit which determines an order of a request for call control of each terminal device which request is related to cut-off from a target from which a session is to be shifted and connection to a session shifting destination according to information related to session generation of each said terminal device and a conference condition and determines timing of call control based on a load condition of said call control server; and a session shift instructing unit which transmits a request for call control to said call control server according to said determined order and timing, wherein said session shift control unit determines an order of a call control request so as to, when each terminal device is allowed to simultaneously set up a plurality of sessions, transmit a call control request for the cut-off from a target from which a session is to be shifted after transmitting a call control request for the connection to a session shifting destination, and when each terminal device is not allowed to simultaneously set up a plurality of sessions, transmit a call control request for the connection to the session shifting destination after transmitting a call control request for the cut-off from the target from which a session is to be shifted and wherein with respect to said terminal device which is allowed to simultaneously set up a plurality of sessions, said session shift control unit determines a charging system of each terminal device and in a case of free communication, determines an order of a call control request so as to transmit a call control request for the connection to a session shifting destination and thereafter when call control related to other terminal device is completed, transmit a call control request for the cut-off from a target from which a session is to be shifted and in a case of charged communication, determines an order of call control so as to transmit a call control request for the cut-off from the target from which a session is to be shifted immediately after transmitting a call control request for the connection to the session shifting destination.