Patent ID: 8275906

Claim:
A communication switching method for switching at least one of a first communication terminal and a second communication terminal to a terminal to which switching is directed, the communication switching method comprising: preparing a first terminal to which a first switching process is directed for the first communication terminal and preparing a second terminal to which a second switching process is directed for the second communication terminal; transmitting a first switch instruction from the first communication terminal to the first terminal; transmitting a first switch connection request from the first terminal to the second communication terminal; transferring the first switch connection request from the second communication terminal to the second terminal upon reception of the first switch connection request from the first terminal; transmitting a second switch instruction from the second communication terminal to the second terminal; and transmitting a second switch connection request from the second terminal to the first communication terminal, wherein the first communication terminal and the second communication terminal are performing communication with each other during the preparing of the first terminal and the preparing of the second terminal, wherein the second terminal detects that the first switching process and the second switching process are being performed simultaneously in both the first communication terminal and the second communication terminal when (i) the second terminal receives the first switch connection request transferred from the second communication terminal after the second terminal has transmitted the second switch connection request to the first communication terminal and while the second terminal is waiting for a response to the second switch connection request, and (ii) the second terminal determines that an identifier included in the first switch connection request is the same as an identifier of the communication between the second communication terminal and the first communication terminal, wherein the second terminal, upon detecting that the first switching process and the second switching process are being performed simultaneously, determines a switching session to be continued between a first switching session related to the first switch connection request and a second switching session related to the second switch connection request, and wherein the second terminal, upon determining to continue the first switching session related to the first switch connection request received from the first terminal, transmits to the second communication terminal, a success response including information on the first switch connection request.