Patent ID: 8732316

Claim:
A communication system comprising: a server configured to receive a connection request message between a first terminal and a second terminal from an upper-level apparatus, and to establish a session with the first terminal and a session with the second terminal respectively; and a call control device for managing the first terminal and the second terminal; wherein: the server, after establishing the session between the server and the first terminal and the session between the server and the second terminal, is configured to send a transfer request of the session to the call control device, the call control device, upon receiving the transfer request, is configured to newly establish a session between the call control device and the first terminal and a session between the call control device and the second terminal, and to send a disconnect request for the session between the server and the first terminal and a disconnect request for the session between the server and the second terminal to the server, and thereafter, the call control device is configured to manage the session between the call control device and the first terminal and the session between the call control device and the second terminal.