Session link system, session liaison, liaison manager, sessionlink method, and program storage medium storing program thereof

A session liaison for linking between a first session and a second session, comprising:

• a session subscriber for attending the first session and the second session;
• a data receiver for receiving data in the first session;
• and
• a data transmitter for transmitting the data in the second session.

A session link method performed by a session link system, said session link system linking a plurality of independent sessions so as to multicast to the plurality of independent sessions first data transmitted from a multicast terminal, said plurality of independent sessions including a first session, said session link system including a data storage for storing a session identifier for identifying the first session, said session link method comprising the steps of:

• receiving a link request including the session identifier from the multicast terminal;
• registering the session identifier in the data storage;
• establishing a link session for linking the plurality of independent sessions, said link session being attended by the multicast terminal;
• attending the first session identified by the session identifier;
• receiving the first data from the multicast terminal in the link session;
• and
• multicasting the first data to the plurality of independent sessions.

A session link method performed by a session liaison for linking between a first session and a second session, said session link method comprising the steps of:

• attending the first session and the second session;
• receiving data in the first session;
• and
• transmitting the data in the second session.

A session link method performed by a session liaison for linking a first session established by a first session server and a second session established by a second session server, said session link method comprising the steps of:

• attending the first session and the second session;
• transmitting an address of the second session server to the first session server as a first voice reception address of the session liaison, said first voice reception address being for receiving voice data in the first session;
• and
• transmitting an address of the first session server to the second session server as a second voice reception address of the session liaison, said second voice reception address being for receiving voice data in the second session.

A program storage medium readable by a computer, said program storage medium storing a program of instructions for the computer to execute a session link method, said computer being included in a session link system, said session link system linking a plurality of independent sessions so as to multicast to the plurality of independent sessions first data transmitted from a multicast terminal, said plurality of independent sessions including a first session, said computer including a data storage for storing a session identifier for identifying the first session, said session link method comprising the steps of:

• receiving a link request including the session identifier from the multicast terminal;
• registering the session identifier in the data storage;
• establishing a link session for linking the plurality of independent sessions, said link session being attended by the multicast terminal;
• attending the first session identified by the session identifier;
• receiving the first data from the multicast terminal in the link session;
• and
• multicasting the first data to the plurality of independent sessions.

A program storage medium readable by a computer, said program storage medium storing a program of instructions for the computer to execute a session link method, said computer being installed in a session liaison for linking between a first session and a second session, said session link method comprising the steps of:

• attending the first session and the second session;
• receiving data in the first session;
• and
• transmitting the data in the second session.

A program storage medium readable by a computer, said program storage medium storing a program of instructions for the computer to execute a session link method, said computer being installed in a session liaison for linking a first session established by a first session server and a second session established by a second session server, said session link method comprising the steps of:

• attending the first session and the second session;
• transmitting an address of the second session server to the first session server as a first voice reception address of the session liaison, said first voice reception address being for receiving voice data in the first session;
• and
• transmitting an address of the first session server to the second session server as a second voice reception address of the session liaison, said second voice reception address being for receiving voice data in the second session.