Terminal-to-terminal communication connection control method using IP transfer network
View Patent ↗Both a connection server and a relay connection server are installed in an IP transfer network; a function similar to a line connection control of a subscriber exchanger is applied to a connection server; a function similar to a line connection control of a relay exchanger is applied to the relay connection server; and a terminal-to-terminal communication connection control method with using the IP transfer network is realized in such a manner that a telephone set and a terminal such as an IP terminal and a video terminal transmit/receive an initial address message, an address completion message, a call pass message, a response message, a release message and a release completion message, which can be made in a 1-to-1 correspondence relationship with line connection control messages of the common line signal system. Furthermore, while an address administration table is set to a network node apparatus of an IP transfer network, means for registering addresses of the terminals into this address administration table is employed, so that an IP packet communication by a multicast manner can be realized with improving information security performance.
1. A communication system with an IP transfer network, wherein said IP transfer network includes plural network node apparatuses, 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 ,
said network node apparatus N 1 has an address management table H 1 being capable of writing and erasing a record, and said network node apparatus N 2 has an address management table H 2 being capable of writing and erasing a record,
a request to communicate with said terminal T 2 and a telephone number or host name TN 2 of said terminal T 2 are sent from said terminal T 1 to said network node apparatus N 1 , and based on said request said network node apparatus N 2 sends a receiving notification based on said request to said terminal T 2 ,
a call-on notification to notify a response preparation starting, is sent from said terminal T 2 to said network node apparatus N 2 ,
a response notification is sent from terminal T 2 to said network node apparatus N 2 ,
said network node apparatus N 1 writes a record R 1 in said address management table H 1 , and said network node apparatus N 2 writes a record R 2 in said address management table H 2 ,
said record R 1 includes an address to discriminate said logical terminal LP 2 , and said record R 2 includes an address to discriminate said logical terminal LP 1 ,
a communication path P 12 in which an internal packet is transferred is defined between said logical terminals LP 1 and LP 2 ,
an external IP packet GP 1 of which destination address is an external IP address EA 2 of said terminal T 2 is sent from said terminal T 1 , then said external IP packet GP 1 is inputted to said network node apparatus N 1 via said logical terminal LP 1 , said external IP packet GP 1 is converted into an internal packet NP 1 based on said record R 1 , and said internal packet NP 1 includes said external IP packet GP 1 ,
said internal packet NP 1 is transferred in said communication path P 12 , and said external IP packet GP 1 restored at said network node apparatus N 2 is sent to said terminal T 2 via said logical terminal LP 2 , and
an external IP packet GP 2 includes a communication cut-off request and is sent from said terminal T 1 or T 2 , causing said network node apparatuses N 1 and N 2 to erase said records R 1 and R 2 , and then said communication path P 12 is erased.
2. A communication system with an IP transfer network, wherein said IP transfer network includes plural network node apparatuses, each of of said apparatuses has an address management table being capable of writing and erasing a record,
a terminal T 1 is connected to a network node apparatus N 1 by a logical terminal LP 1 via a communication line Ll, 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 ,
said network node apparatus N 1 has an address management table H 1 , and said network node apparatus N 2 has an address management table H 2 ,
a request to communicate with said terminal T 2 and a telephone number or host name TN 2 of said terminal T 2 are sent from said terminal T 1 to said network node apparatus N 1 ,
said network node apparatus N 1 writes a record R 1 which includes an address to discriminate said logical terminal LP 2 , in said address management table H 1 , and said network node apparatus N 2 writes a record R 2 which includes an address to discriminate said logical terminal LP 1 , in said address management table H 2 ,
a communication path P 12 in which an internal packet is transferred is defined between said logical terminals LP 1 and LP 2 ,
an external IP packet GP 1 of which destination address is an external IP address EA 2 of said terminal T 2 is sent from said terminal T 1 , then said external IP packet GP 1 is inputted to said network node apparatus N 1 via said logical terminal LP 1 ,
said external IP packet GP 1 is converted into an internal packet NP 1 , which includes said external IP packet GP 1 , based on said record R 1 ,
said internal packet NP 1 is transferred in said communication path P 12 , and said external IP packet GP 1 restored at said network node apparatus N 2 is sent to said terminal T 2 via said logical terminal LP 2 , and
an external IP packet GP 2 including a communication cut-off request is sent from said terminal T 1 or T 2 , then said network node apparatuses N 1 and N 2 erase said records R 1 and R 2 , and then said communication path P 12 is erased.