Patent ID: 8296447

Claim:
A method for copying session information, the method being executed by a call control server that establishes a media session for sending and receiving media data between a calling terminal and a called terminal based on a call setup request by the calling terminal, the method comprising: a sending and receiving operation of sending and receiving messages to and from the calling terminal and the called terminal in a call control session for establishing the media session; a session information generating operation of generating session information that is required for executing the call control session; a table generation operation of receiving the call setup request and preparing an information table, the information table setting a call ID, terminal names, and a session ID that are included in the call setup request; a storing operation of storing, in the information table, media information for determining the establishment of the media session based on the sent and received messages involved in the call control session; a monitoring operation of monitoring the media information that defines a method of sending and receiving the media data, the media information being included in the messages; a copying determining operation of determining whether or not the media session has been established according to a monitoring result; and a copying processing operation of automatically copying the session information and sending the copied session information to at least one other call control server different from the call control server when it is determined that the media session has been established, wherein the copying determining operation determines that the media session has been established when the monitoring operation detects that a sending destination address received from the calling terminal has been sent to the called terminal and detects that a sending destination address received from the called terminal has been sent to the calling terminal.