Patent ID: 7440456
Filing Date: 2008-10-21
Classification: H04M,H04Q

Abstract:
1. A communication system with an IP network, wherein: said IP network includes an internal networks A and B and plural network node unit, a terminal T when an external IP packet inputs to a network node unit from a logical terminal LP, an address input condition inspection whether a pair of a discrimination information to discriminate said logical terminal LP and a destination external IP address in said external IP packet is included at a communication record R in said network node unit or not is carried out, said network node unit N said network node unit N said communication records R an external IP packet A being an source port number P when said address input condition of said communication record R when said port numbers P said internal IP packet A is transferred in said communication path P an external IP packet B being an source port number P when said address input condition of said communication record R when said port numbers P said internal IP packet B is transferred in said communication path P