The SIP communication system, the SIP gateway device and the SIP communications control method null of using for

摘要

PROBLEM TO BE SOLVED: To provide an SIP communication system in which an address in a base is constituted of a private address to thereby prevent the tapping and alteration of RTP communication.;SOLUTION: During a process in which an SIP gateway 1-1 existing in a base 201 and an SIP gateway 1-2 existing in a base 202 establish an RTP session such as telephone call between an SIP terminal 2-1 existing in the base 201 and an SIP terminal 2-2 existing in the base 202, addresses of the SIP gateways 1-1, 1-2 are recorded in a payload in an SIP packet. The SIP gateway 1-1 detects the address of the SIP gateway 1-2 included in the payload of the SIP packet, an RTP address and a port number used between the SIP terminal 2-1 and the SIP terminal 2-2 and dynamically sets an IPsec tunnel 101 which encapsulates the RTP communication between the SIP gateway 1-1 and the SIP gateway 1-2 by IPsec.;COPYRIGHT: (C)2007,JPO&INPIT