Patent ID: 8565245
Filing Date: 2013-10-22
Classification: H04L,H04M

Abstract:
1. A communication system, wherein: a terminal T 1 is connected to a network node apparatus N 1 by a logical terminal LP 1 via a communication line L 1 , and a terminal T 2 is connected to a network node apparatus N 2 by a logical terminal LP 2 via a communication line L 2 , a server S 1 receives a telephone number or a host name of said terminal T 2 and a connection request from said terminal T 1 , and said server S 1 forms a message 1 based on said telephone number or host name of said terminal T 2 and said connection request and sends said message 1 to a server S 2 , said server S 2 sends a receiver notification to said terminal T 2 and receives a call-on notification from said terminal T 2 , and said server S 2 forms a message 2 based on said call-on notification and sends said message 2 to said server S 1 , said server S 2 receives a response notification from said terminal T 2 , and said server S 2 forms a message 3 based on said response notification and sends said message 3 to said server S 1 , said network node apparatus N 1 sets a communication record R 1 , said network node apparatus N 2 sets a communication record R 2 , and then a communication path P 12 in which an internal packet is transferred, is set between said logical terminals LP 1 and LP 2 , an external IP packet, including voice or data, sent from said terminal T 1 is inputted to said network node apparatus N 1 from said logical terminal LP 1 , and said network node apparatus N 1 inspects whether said communication record R 1 exists or not, based on an information to discriminate said logical terminal LP 1 and a destination IP address of said external IP packet, in case of finding said communication record R 1 , said network node apparatus N 1 converts, based on said communication record R 1 , said external IP packet into said internal packet which contains said external IP packet, said internal packet is transferred in said communication path P 12 , and said external IP packet restored at said network node apparatus N 2 is sent to said terminal T 2 from said logical terminal LP 2 , and said server S 1 forms a message 4 based on a communication release request sent from said terminal T 1 and sends said message 4 to said server S 2 , said network node apparatus N 1 and N 2 reset said communication records R 1 and R 2 , and then said communication path P 12 is reset.