SIGNAL PROCESSING DEVICE, PROGRAM, AND COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To achieve a communication session switching processing between communication devices having different process specifications related to a communication session. SOLUTION: There is provided a communication system that includes a plurality of communication devices and a signal processing device for processing a packet flowing among the plurality of communication devices. Then, the signal processing device includes: a means for receiving the packet from a transmitting communication device; and a means for transmitting the received packet, simply as received or after processing by a packet converting means, to a receiving communication device that is a destination of the packet, wherein when a communication session and the session is shifted from a state that the communication session connecting between a first transmitting communication device and the receiving communication device is established to have a connection between a second transmitting communication device and the receiving communication device, the packet converting means processes the received packet received from the second transmitting communication device so as to maintain a consecutiveness related to a content of packets to be transmitted to the receiving communication device. COPYRIGHT: (C)2011,JPO&INPIT