| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problems that it is required that media transmission and reception information be reported twice to each of an FW at a private side and that at a global one when an FW function is arranged in front and behind an NAT function, namely at each of the private and global sides, in an NAT/FW apparatus; and throughput is increased. <P>SOLUTION: An IP address for media transmission and reception obtained by a media transmission and reception information extraction function 101 and a port number and an IP address after being converted by a function for converting the IP address in an SIP message and the port number are retained in an internal database, and the internal database is referred to when the media transmission reception information is reported to the NAT/FW apparatus 20, thus reporting the entirety of information on the IP addresses for media transmission and reception before and after conversion and the port numbers simultaneously. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
