Terminal-to-terminal communication connection control method using IP transfer network

• US 7,505,471 B2
• Filed: 06/01/2007
• Issued: 03/17/2009
• Est. Priority Date: 04/06/2000
• Status: Expired due to Fees

• Current Assignee: The Distribution Systems Research Institute (GS1 AISBL)
• Original Assignee: The Distribution Systems Research Institute (GS1 AISBL), Miyaguchi Research Co., Ltd.
• Inventors: Miyaguchi, Shoji, Furukawa, Hisao
• Primary Examiner(s): Levitan, Dmitry
• Application Number:
  US11/809,904
• Publication Number:
  US 20070297391A1
• Time in Patent Office: 655 Days
• Field of Search: 370352-354, 370/389, 370/392, 370/393, 370/400, 370/401
• US Class Current: 370/400
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 2101/668 Internet protocol [IP] address subnets
• CPC Class Codes: H04L 61/2514 between local and global IP addresses
• CPC Class Codes: H04L 61/2517 using port numbers
• CPC Class Codes: H04L 61/2535 Multiple local networks, e.g. resolving potential IP address conflicts
• CPC Class Codes: H04L 61/255 Maintenance or indexing of mapping tables
• CPC Class Codes: H04L 61/2564 for a higher-layer protocol, e.g. for session initiation protocol [SIP]
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• CPC Class Codes: H04L 61/4557 Directories for hybrid networks, e.g. including telephone numbers
• CPC Class Codes: H04L 63/0236 Filtering by address, protocol, port number or service, e.g. IP-address or URL
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 65/1043 Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
• CPC Class Codes: H04L 65/1069 Session establishment or de-establishment
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

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.

Claims

1. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural connection servers, plural proxy connection servers and a domain name server,

plural terminals are connected to said IP transfer network, a terminal T1 is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2, and said domain name server holds a set of a telephone number or host name TNj (j=1,2,3, . . . ) of a terminal Tj, an internal IP address IAj being a discrimination information of a logical terminal LPj and an internal IP address k of a connection server Sk carrying out a connection control of said terminal Tj,

an IP communication record R81 including a discrimination information of said logical terminal LP1 is set in said network node apparatus N1, and an IP communication record R82 including a discrimination information of said logical terminal LP2 is set in said network node apparatus N2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2, wherein said external IP packet 1 includes a connection request and said telephone numbers or host names TN1 and TN2 and a destination address thereof is an external IP address EA81 of a proxy connection server PS1,

said network node apparatus N1 inspects an IP capsulation condition to be satisfied by an external IP address in said external IP packet 1 according to a rule of said IP communication record R81,

said external IP packet 1 which said IP capsulation condition is not satisfied is discarded,

when said IP capsulation condition is satisfied, said network node apparatus N1 forms a first type internal IP packet 11 by capsulating said external IP packet 1 and sends it, a destination address of said internal IP packet 11 is an internal IP address IA81 of said proxy connection server PS1, said proxy connection server PS1 converts said internal IP packet 11 into a second type internal IP packet 12 and sends it to a connection server S1,

said connection server S1 obtains said telephone numbers or host names TN1 and TN2 and said external IP address EA1 from said internal IP packet 12, and further obtains an external IP address EA2 of said terminal T2, an internal IP address IA2 being a discrimination information of said logical terminal LP2 and an internal IP address IA92 of said connection server S2 carrying out a connection control of said terminal T2 by presenting said telephone number or host name TN2 of said destination terminal T2 to a domain name server DS1,

said connection server S1 sends an initial address message (IAM) including said connection request to said connection server S2, said connection server S2 obtains said telephone numbers or host names TN1 and TN2, said external IP address EA1 and EA2 and said internal IP address IA1 and IA2 from said initial address message (IAM), said connection server S2 sends a second type internal IP packet 21 including a receipt notification, said internal IP packet 21 is converted into a first type internal IP packet 22 by a proxy connection server PS2, said internal IP packet 22 is converted into an external IP packet 2 including said receipt notification at said network node apparatus N2, said external IP packet 2 reaches at said terminal T2, and said connection server S2 forms an address completion message (ACM) including a receipt propriety notification and sends it to said connection server S1,

said terminal T2 transmits an external IP packet 3 that includes a call-on notification for notifying a response preparation start and a destination address thereof is an external IP address EA82 of a proxy connection server PS2, an external IP address of said external IP packet 3 is judged at said network node apparatus N2 according to an IP capsulation condition defined by said IP communication record R82, said external IP address becomes to a first type internal IP packet 31 including said call-on notification, and then becomes to a second type internal IP packet 32 and reaches at said connection server S2,

said connection server S2 forms a call progress message (CPG) including said call-on notification and sends it to said connection server S1, said connection server S1 sends a second type internal IP packet 41 including said call-on notification, said internal IP packet 41 becomes to a first type internal IP packet 42 and becomes to an external IP packet 4 including said call-on notification at said network node apparatus N1, and said external IP packet 4 reaches at said terminal T1,

said terminal T2 transmits an external IP packet 5 including a response notification for notifying a response and a port number PN2 of said terminal T2, an IP capsulation condition of said external IP packet 5 is judged at said network node apparatus N2 and becomes to a first type internal IP packet 51 including said response notification, said internal IP packet 51 becomes to a second type internal IP packet 52 and reaches at said connection server S2, said connection server S2 forms a response message (ANN) including said response notification and said port number PN2 and sends it to said connection server S1, said connection server S1 sends a second type internal IP packet 61 including said response notification, an external IP address EA2 of said terminal T2 and said port number PN2, said internal IP packet 61 becomes a first type internal IP packet 62, said internal IP packet 62 becomes to an external IP packet 6 including said response notification, an external IP address EA2 of said terminal T2 and said port number PN2 and then reaches at said terminal T1,

said connection server S2 commands a setting of an IP communication record R2 including a discrimination information of said logical terminal LP2 for said network node apparatus N2, said connection server S1 commands a setting of an IP communication record R1 including a discrimination information of said logical terminal LP1 for said network node apparatus N1, said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 7 that a source address is said external IP address EA1, a destination address is said external IP address EA2 of said terminal T2 and a destination port number is said port number PN2, said external IP packet 7 is judged at network node apparatus N1 whether an IP capsulation condition is satisfied based on administration of said communication record R1 or not,

when said IP capsulation condition is satisfied, said external IP packet 7 is capsulated, said capsulated packet becomes to an internal IP packet 7 that a destination address is said internal IP address IA2 for discriminating said logical terminal LP2 and is transferred in said communication path P12, and it is reversely capsulated at said network node apparatus N2 and then a restored external IP packet 7 is sent to said terminal T2, and

when said terminal T1 transmits an external IP packet 9 that includes a communication cutting-off request and a destination address is said external IP address EA81, said external IP packet 9 becomes to an internal IP packet 9 including said communication cuffing-off request and then reaches at said connection server S1, said connection servers S1 and S2 send/receive a release message (REL) or a release completion message (RLC) and command a disappear of said communication records R1 and R2.

2. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural termination gateways GW, said termination gateways GW respectively include plural network node apparatus and a domain name server,

plural terminals are connected to said IP transfer network, a terminal T1 is connected to a network node apparatus N1 in a termination gateway GW1 by a logical terminal LP1 via a communication line L1, a terminal T2 is connected to a network node apparatus N2 in a termination gateway GW2 by a logical terminal LP2 via a communication line L2, and said domain name server holds a set of a telephone number or host name TNj (j=1,2,3, . . . ) and an external IP address EAj of a terminal Tj, an internal IP address IAJ being a discrimination information of a logical terminal LPj and an internal IP address k of a termination gateway GWk carrying out a connection control of said terminal Tj,

an IP communication record R81 including a discrimination information of said logical terminal LP1 is set in said network node apparatus N1, and an IP communication record R82 including a discrimination information of said logical terminal LP2 is set in said network node apparatus N2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2, wherein said external IP packet 1 includes a connection request and said telephone number or host name TN2 and a destination address thereof is a connection control request address EA81 which is an address for transmitting an external IP packet on a connection control of said termination gateways GW,

said network node apparatus N1 inspects an IP capsulation condition define by said IP communication record R81 for an external IP address in said external IP packet 1,

said external IP packet 1 which said IP capsulation condition is not satisfied is discarded,

when said IP capsulation condition is satisfied, said network node apparatus N1 converts said external IP packet 1 into an internal IP packet 1 by a capsulation,

said termination gateway GW1 obtains said telephone numbers or host names from said internal IP packet 1, and further obtains an external IP address EA2 of said terminal T2, an internal IP address IA2 being a discrimination information of said logical terminal LP2 and an internal IP address IA92 of said termination gateway GW2 carrying out a connection control of said terminal T2 by using said domain name server DS1, and said termination gateway GW1 sends an initial address message (IAM) including the connection request to said termination gateway GW2,

said termination gateway GW2 obtains said connection request, said telephone numbers or host names TN1 and TN2, said external IP address EA1 and EA2 and said internal IP address IA1 and IA2 from said initial address message (IAM), said termination gateway GW2 sends an internal IP packet 2 including a receipt notification, said internal IP packet 2 is converted into an external IP packet 2 at said network node apparatus N2, said external IP packet 2 reaches at said terminal T2, and said termination gateway GW2 forms an address completion message (ACM) including a receipt propriety notification and sends it to said termination gateway GW1,

said terminal T2 transmits an external IP packet 3 that includes a call-on notification for notifying a response preparation start and a destination address thereof is a connection control request address EA82, said external IP packet 3 is judged at said network node apparatus N2 whether an IP capsulation condition defined by said IP communication record R82 is satisfied or not,

when said IP capsulation condition is satisfied, said external IP packet 3 becomes to an internal IP packet 3 including said call-on notification and then inputs to said termination gateway GW2, said termination gateway GW2 sends a call progress message (CPG) including said call-on notification to said termination gateway GW1, said termination gateway GW1 sends an internal IP packet 4 including said call-on notification, said internal IP packet 4 becomes to an external IP packet 4 including said call-on notification at said network node apparatus N1 and reaches at said terminal T1,

said external IP packet 5 is judged whether said IP capsulation condition is satisfied or not,

when said IP capsulation condition is satisfied, said external IP packet 5 becomes to an internal IP packet 5 including said call-on notification and then inputs to said termination gateway GW2, said termination gateway GW2 sends a response message (ANM) including said response notification to said termination gateway GW1, said termination gateway GW1 sends an internal IP packet 6 including said response notification and an external IP address EA2 of said terminal T2, said internal IP packet 6 becomes to an external IP packet 6 including said response notification and said external IP address EA2 of said terminal T2 at said network node apparatus N1 and then reaches at said terminal T1,

said termination gateway GW2 presents a setting of an IP communication record R2 including a discrimination information of said logical terminal LP2 for said network node apparatus N2, said termination gateway GW1 presents a setting of an IP communication record R1 including a discrimination information of said logical terminal LP1 for said network node apparatus N1, said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 7 that a destination address is said external IP address EA2 of said terminal T2, said external IP packet 7 inputs to said network node apparatus N1, said external IP packet 7 is judged whether an IP capsulation condition is satisfied or not,

when said IP capsulation condition is satisfied, said external IP packet 7 is converted into an internal IP packet 7 that a destination address is said internal IP address IA2 for discriminating said logical terminal LP2 and is transferred in said communication path P12,

when said internal IP packet 7 reaches at said network node apparatus N2, it is restored to said external IP packet 7 and then reaches at said terminal T2, and

when said terminal T1 transmits an external IP packet 9 that includes a communication cutting-off request and a destination address is said connection control request address EA81, said external IP packet 9 becomes to an internal IP packet 9 including said communication cutting-off request at said network node apparatus N1 and then inputs to said termination gateway GW1, and said termination gateways GW1 and GW2 send/receive a release message (REL) or a release completion message (RLC) and command a disappear of said IP communication records R1 and R2.

3. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, a connection server X, plural proxy connection servers and a domain name server X,

plural terminals are connected to said IP transfer network, a terminal T1 having a telephone number or host name TN1 is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 having a telephone number or host name TN2 is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2, and said domain name server X holds a set of a telephone number or host name TNj (j=1,2,3, . . . ) and an external IP address EAj of a terminal Tj and an internal IP address IAj being a discrimination information of a logical terminal LPj,

an IP communication record R81 including a discrimination information of said logical terminal LP1 is set in said network node apparatus N1, and an IP communication record R82 including a discrimination information of said logical terminal LP2 is set in said network node apparatus N2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2, wherein said external IP packet 1 includes a connection request and said telephone numbers or host names TN2 and a destination address thereof is an external IP address EA81 of a proxy connection server PS1,

said external IP packet 1 inputs to said network node apparatus N1 from said logical terminal LP1,

said network node apparatus N1 inspects an IP capsulation condition defined by a rule of said IP communication record R81 for an external IP address in said external IP packet 1,

said external IP packet 1 which said IP capsulation condition is not satisfied is discarded,

when said IP capsulation condition is satisfied, said network node apparatus N1 forms a first type internal IP packet 11 by capsulating said external IP packet 1 and sends it, a destination address of said internal IP packet 11 is an internal IP address IA81 of said proxy connection server PS1, said proxy connection server PS1 converts said internal IP packet 11 into a second type internal IP packet 12 and sends it to a connection server X,

said connection server X obtains said telephone numbers or host names TN1 and TN2 from said internal IP packet 12, and further obtains an external IP address EA2 of said terminal T2 and an internal IP address IA2 being a discrimination information of said logical terminal LP2 by presenting said telephone number or host name TN2 to a domain name server DS1,

said connection server X sends a second type internal IP packet 21 including a receipt notification, said internal IP packet 21 is converted into a first type internal IP packet 22 by a proxy connection server PS2, said internal IP packet 22 is converted into an external IP packet 2 including said receipt notification at said network node apparatus N2 , and said external IP packet 2 reaches at said terminal T2,

said terminal T2 transmits an external IP packet 3 that includes a call-on notification for notifying a response preparation start and a destination address thereof is an external IP address EA82 of a proxy connection server PS2, said external IP packet 3 is judged at said network node apparatus N2 whether it satisfies an IP capsulation condition defined by said IP communication record R82 or not, said external IP packet 3 becomes to a first type internal IP packet 31 including said call-on notification, and then becomes to a second type internal IP packet 32 and reaches at said connection server X,

said connection server X sends a second type internal IP packet 41 including said call-on notification, said internal IP packet 41 becomes to a first type internal IP packet 42, and said internal IP packet 42 becomes to an external IP packet 4 including said call-on notification at said network node apparatus N1 and then reaches at said terminal T1, said terminal T2 transmits an external IP packet 5 including a response notification for notifying a response, an IP capsulation condition of said external IP packet 5 is judged at said network node apparatus N2 and becomes to a first type internal IP packet 51 including said response notification, said internal IP packet 51 becomes to a second type internal IP packet 52 and reaches at said connection server X, said connection server X sends a second type internal IP packet 61 including said response notification and said external IP address EA2, said internal IP packet 61 becomes to a second type internal IP packet 62, said internal IP packet 62 becomes to an external IP packet 6 including said response notification and said external IP address EA2 and then reaches at said terminal T1,

said connection server X commands a setting of an IP communication records R1 and R2 including discrimination information of said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 7 that a destination address is said external IP address EA2 of said terminal, said external IP packet 7 is judged at network node apparatus N1 whether an IP capsulation condition is satisfied based on administration of said IP communication record R1 or not,

when said IP capsulation condition is satisfied, said external IP packet 7 is capsulated, said capsulated packet becomes to an internal IP packet 7 that a destination address is said internal IP address IA2 for discriminating said logical terminal LP2 and is transferred in said communication path P12, and it is reversely capsulated at said network node apparatus N2 and then a restored external IP packet 7 is sent to said terminal T2, and

when said terminal T1 transmits an external IP packet 9 that includes a communication cutting-off request and a destination address is said external IP address EA81, said external IP packet 9 becomes to an internal IP packet 9 including said communication cuffing-off request and then reaches at said connection server X, and a disappear of said communication records R1 and R2 is commanded.

4. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural connection servers and a domain name server, a terminal T1 outside of said IP transfer network is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, and a terminal T2 outside of said IP transfer network is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2, wherein said external IP packet 1 includes a connection request and a telephone number or host name TN2 of said terminal T2 and a destination address thereof is an address of a connection server S1,

said external IP packet 1 inputs to said network node apparatus N1 from logical terminal LP1, and an IP capsulation condition is inspected according to a rule of said IP communication record R81,

when said IP capsulation condition is satisfied, said external IP packet 1 becomes to an internal IP packet 1 and then reaches at said connection server S1,

said connection server S1 obtains an external IP address EA2 of said terminal T2, an internal IP address IA2 for discriminating said logical terminal LP2 and an internal IP address 2 of said connection server S2 carrying out a connection control of said terminal T2 by presenting said telephone number or host name TN2 to a domain name server DS1, and sends an initial address message (IAM) including said connection request to said connection server S2,

when said connection server S2 sends an internal IP packet 2 including a connection request notification, said internal IP packet 2 is converted into an external IP packet 2 according to a rule of an IP communication record R82 in said network node apparatus N2 and then is sent to said terminal T2,

an external IP packet 3 including said call-on notification is sent from said terminal T2, said external IP packet 3 is converted into an internal IP packet 3 at said network node apparatus N2 according to a rule of said IP communication record R82 and then reaches at said connection server S2, and said connection server S2 forms a call progress message (CPG) including said call-on notification and sends it to said connection server S1,

when said terminal T2 transmits an internal IP packet 4 including said call-on notification, said internal IP packet 4 is converted into an external IP packet 4 and then reaches at said terminal T1,

when an external IP packet 5 including a response notification from said terminal T2, said external IP packet 5 is converted into an internal IP packet 5 at said network node apparatus N2 and then reaches at said connection server S2,

said connection server S2 forms a response message (ANM) including said response notification and sends it to said connection server S1,

when said connection server S1 sends an internal IP packet 6 including said response notification and said external IP address EA2, said internal IP packet 6 reaches at said terminal T1, said connection servers S1 and S2 respectively command setting of IP communication records R1 and R2 including internal IP address IA1 and IA2 for discriminating said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, and said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 7 that a destination address is said external IP address EA2 of said terminal T2, said external IP packet 7 is judged at network node apparatus N1 whether an IP capsulation condition is satisfied based on a rule of said IP communication record R1 or not, said external IP packet 7 becomes to an internal IP packet 7 that a destination address is said internal IP address IA2, and said internal IP packet 7 is transferred in said communication path P12, and an external IP packet 7 restored at network node apparatus N2 is sent to said terminal T2, and

when said terminal T1 transmits an external IP packet 9 that includes a communication cutting-off request and a destination address is an address of said connection server S1, said external IP packet 9 including said communication cutting-off request reaches at said connection server S1, said connection servers S1 and S2 send/receive a release message (REL) or a release completion message (RLC) and command a disappear of said communication records R1 and R2.

5. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural connection servers and a domain name server,

a terminal T1 outside of said IP transfer network is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, and a terminal T2 outside of said IP transfer network is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2,

said terminal T1 transmits an external IP packet 1 including a connection request and a telephone number or host name TN2 of said terminal T2, said external IP packet 1 inputs to said network node apparatus N1 from said logical terminal LP1, said network node apparatus N1 sends said connection request and said telephone number or host name TN2,

said connection server S1 obtains an external IP address EA2 of said terminal T2 and an IP address IA2 of said connection server S2 carrying out a connection control of said terminal T2 by presenting said telephone number or host name TN2 to a domain name server DS1, said connection server S1 sends an initial address message (IAM) including said connection request to said connection server S2, and said connection server S2 sends a connection request notification to said terminal T2 having said external IP address EA2,

said terminal T2 transmits said response notification to said connection server S2, said connection server S2 sends said response notification to said connection server S1, and said connection server S1 sends said response notification to said terminal T1,

said connection servers S1 and S2 respectively command setting of IP communication records R1 and R2 including internal IP address IA1 and IA2 for discriminating said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, and said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 2 that a destination address is said external IP address EA2 of said terminal T2, said external IP packet 2 is judged at network node apparatus N1 whether an IP capsulation condition is satisfied based on a rule of said IP communication record R1 or not, said external IP packet 2 becomes to an internal IP packet 2 that a destination address is said internal IP address IA2, and said internal IP packet 2 is transferred in said communication path P12, and an external IP packet 2 restored at network node apparatus N2 is sent to said terminal T2, and

when said terminal T1 transmits a communication cutting-off request to said connection server S1, said connection servers S1 and S2 send/receive a release message (REL) or a release completion message (RLC) and command a disappear of said communication records R1 and R2.

6. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural connection servers, plural proxy connection servers and a domain name server,

plural terminals are connected to said IP transfer network , a terminal T1 is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2, and said domain name server holds a set of a telephone number or host name TNj (j=1, 2,3, . . . ) and an external IP address LAJ of a terminal Tj, a discrimination information IAj of a logical terminal LPj and an internal IP address k of an internal address k carrying out a connection control of said terminal Tj,

an IP communication record R81 including a discrimination information of said logical terminal LP1 is set in said network node apparatus N1, and an IP communication record R82 including a discrimination information of said logical terminal LP2 is set in said network node apparatus N2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2, wherein said external IP packet 1 includes a connection request and said telephone numbers or host names TN1 and TN2 and a destination address thereof is an external IP address EA81 of a proxy connection server PS1,

said network node apparatus N1 inspects a simple capsulation condition defined by a rule of said IP communication record R81 for external IP address in said external IP packet 1, wherein said simple capsulation is that a simple header without a source address is added to said external IP packet 1,

said external IP packet 1 which said simple capsulation condition is not satisfied is discarded,

when said simple capsulation condition is satisfied, said network node apparatus N1 forms a first type internal IP packet 11 by simply capsulating said external IP packet 1 and sends it, a destination address of said internal IP packet 11 is an internal IP address IA81 of said proxy connection server PS1, and said proxy connection server PS1 converts said internal IP packet 11 into a second type internal IP packet 12 and sends it to a connection server S1,

said connection server S1 obtains said telephone numbers or host names TN1 and TN2 and said external IP address EA1 from said internal IP packet 12, and further obtains an external IP address EA2 of said terminal T2, a discrimination information IA2 of said logical terminal LP2 and an internal IP address IA92 of said connection server S2 carrying out a connection control of said terminal T2 by presenting said telephone number or host name TN2 of said destination terminal T2 to a domain name server DS1,

said connection server S1 sends an initial address message (IAM) including said connection request to said connection server S2, said connection server S2 obtains said telephone numbers or host names TN1 and TN2, said external IP address EA1 and EA2 and said internal IP address IAl and IA2 from said initial address message (IAM) , said connection server S2 sends a second type internal IP packet 21 including a receipt notification, said internal IP packet 21 is converted into a first type internal IP packet 22 by a proxy connection server PS2, said internal IP packet 22 is converted into an external IP packet 2 including said receipt notification at said network node apparatus N2, said external IP packet 2 reaches at said terminal T2, and said connection server S2 forms an address completion message (ACM) including a receipt propriety notification and sends it to said connection server S1,

said terminal T2 transmits an external IP packet 3 that includes a call-on notification for notifying a response preparation start and a destination address thereof is an external IP address EA82 of a proxy connection server PS2, an external IP address of said external IP packet 3 is judged at said network node apparatus N2 according to a simple capsulation condition defined by said IP communication record R82, said external IP address becomes to a first type internal IP packet 31 including said call-on notification, and then becomes to a second type internal IP packet 32 and then reaches at said connection server S2,

said connection server S2 forms a call progress message (CPG) including said call-on notification and sends it to said connection server S1, said connection server S1 sends a second type internal IP packet 41 including said call-on notification, said internal IP packet 41 becomes to a first type internal IP packet 42 and becomes to an external IP packet 4 including said call-on notification at said network node apparatus N1, and said external IP packet 4 reaches at said terminal T1,

said terminal T2 transmits an external IP packet 5 including a response notification for notifying a response and a port number PN2 of said terminal T2, a simple capsulation condition of said external IP packet 5 is judged at said network node apparatus N2 and becomes to a first type internal IP packet 51 including said response notification, said internal IP packet 51 becomes to a second type internal IP packet 52 and reaches at said connection server S2, said connection server S2 forms a response message (ANM) including said response notification and said port number PN2 and sends it to said connection server S1, said connection server S1 sends a second type internal IP packet 61 including said response notification, an external IP address EA2 of said terminal T2 and said port number PN2, said internal IP packet 61 becomes a first type internal IP packet 62, said internal IP packet 62 becomes to an external IP packet 6 including said response notification at said network node apparatus N1, and said external IP packet 6 reaches at said terminal T1,

said connection server S2 commands a setting of an IP communication record R2 including a discrimination information of said logical terminal LP2 for said network node apparatus N2, said connection server S1 commands a setting of an IP communication record R1 including a discrimination information of said logical terminal LP1 for said network node apparatus N1, and said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 7 that a source address is said external IP address EA1, a destination address is said external IP address EA2 of said terminal T2 and a destination port number is said port number PN2, said external IP packet 7 is judged at network node apparatus N1 whether a simple capsulation condition is satisfied based on administration of said communication record R1 or not,

when said simple capsulation condition is satisfied, said external IP packet 7 is simply capsulated, said simply capsulated packet becomes to an internal IP packet 7 that a destination address is an internal IP address IA2x defined based on said discrimination information IA2 of said logical terminal LP2 and is transferred in said communication path P12, and it is reversely and simply capsulated at said network node apparatus N2 and then a restored external IP packet 7 is sent to said terminal T2, and

when said terminal T1 transmits an external IP packet 9 that includes a communication cutting-off request and a destination address is said external IP address EA81, said external IP packet 9 becomes to an internal IP packet 9 including said communication cutting-off request and then reaches at said connection server S1, said connection servers S1 and S2 send/receive a release message (REL) or a release completion message (RLC) and command a disappear of said communication records R1 and R2.

7. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural connection servers and a domain name server,

a terminal T1 outside of said IP transfer network is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 outside of said IP transfer network is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2 by using a telephone number or host name, wherein said external IP packet 1 includes a connection request and a telephone number or host name TN2 of said terminal T2, said external IP packet 1 inputs to said network node apparatus N1 from said logical terminal LP1, said network node apparatus N1 sends said connection request and said telephone number or host name TN2 to a connection server X,

said connection server X obtains an external IP address LA2 of said terminal T2 by presenting said telephone number or host name TN2 to said domain name server DS, said connection server X sends a connection request notification to said terminal T2 having said external IP address LA2,

said terminal T2 transmits a response notification to said connection server X, and said connection server X sends said response notification to said terminal T1,

said connection server X commands a setting of IP communication records R1 and R2 including internal IP address IA1 and IA2 for discriminating said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, and said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 2 of which source address is said external IP address EA2, said external IP packet 2 is judged at network node apparatus N1 whether an IP capsulation condition is satisfied or not,

when said IP capsulation condition is satisfied, said external IP packet 2 becomes to an internal IP packet 2 of which destination address is said internal IP address IA2 and is transferred in said communication path P12, and an external IP packet 2 which is restored at said network node apparatus N2 is sent to said terminal T2, and

when said terminal T1 transmits a communication cutting-off request to said connection server X, said connection server X commands a disappear of said IP communication records R1 and R2.

8. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural connection servers and a domain name server,

a terminal T1 outside of said IP transfer network is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 outside of said IP transfer network is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2 by using a telephone number or host name, wherein said external IP packet 1 includes a connection request and a telephone number or host name TN2 of said terminal T2, said external IP packet 1 inputs to said network node apparatus N1 from said logical terminal LP1, said network node apparatus N1 sends said connection request and said telephone number or host name TN2 to a connection server X,

said connection server X obtains an external IP address LA2 of said terminal T2 by presenting said telephone number or host name TN2 to said domain name server DS, said connection server X sends a connection request notification to said terminal T2 having said external IP address LA2,

said terminal T2 transmits a response notification to said connection server X, and said connection server X sends said response notification to said terminal T1,

said connection server X commands a setting of simple capsulation communication records R1 and R2 including internal IP address IA1 and IA2 for discriminating said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, wherein said simple capsulation is that a simple header without a source address is added to an external IP packet, and said simple capsulation communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 2 of which source address is said external IP address EA2, said external IP packet 2 is judged at network node apparatus N1 whether a simple capsulation condition is satisfied or not,

when said simple capsulation condition is satisfied, said external IP packet 2 becomes to an internal IP packet 2 of which destination address is said internal IP address IA2 and is transferred in said communication path P12, and an external IP packet 2 which is restored at said network node apparatus N2 is sent to said terminal T2, and

when said terminal T1 transmits a communication cutting-off request to said connection server X, said connection server X commands a disappear of said simple capsulation communication records R1 and R2.

9. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural connection servers and plural domain name servers,

a terminal T1 outside of said IP transfer network is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 outside of said IP transfer network is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2 by using a telephone number or host name, wherein said external IP packet 1 includes a connection request and a telephone number or host name TN2 of said terminal T2, said external IP packet 1 inputs to said network node apparatus N1 from said logical terminal LP1, said network node apparatus N1 sends said connection request and said telephone number or host name TN2 to a connection server S1,

said connection server S1 obtains an external IP address EM of said terminal T2 and an internal IP address 2 of a connection server S2 carrying out a connection control of said terminal T2 by presenting said telephone number or host name TN2 to said domain name server DS1, said connection server S1 sends an initial address message (IAM) including said connection request to said connection server S2, and said connection server S2 said connection request notification to said terminal T2 having said external IP address EA2,

said terminal T2 transmits a response notification to said connection server S2, said connection server S2 sends said response notification to said connection server S1, and said connection server S1 sends said response notification to said terminal T1,

said connection server S1 and S2 command a setting of simple capsulation communication records R1 and R2 including identifiers IA1 and IA2 for discriminating said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, wherein said simple capsulation is that a simple header without a source address is added to an external IP packet, and said simple capsulation communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 2 of which source address is said external IP address EA2, said external IP packet 2 is judged at network node apparatus N1 whether a simple capsulation condition is satisfied according to a rule of said simple capsulation communication record R1 or not,

when said simple capsulation condition is satisfied, said external IP packet 2 becomes to an internal IP packet 2 including said external IP packet 2 and said identifier IA2 and is transferred in said communication path P12, and an external IP packet 2 which is restored at said network node apparatus N2 is sent to said terminal T2, and

when said terminal T1 transmits a communication cutting-off request to said connection server S1, said connection servers S1 and S2 command a disappear of said simple capsulation communication records R1 and R2, whereby said communication path P12 is disappeared.

10. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, a terminal T1 outside of said IP transfer network is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 outside of said IP transfer network is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2 by using a telephone number or host name, wherein said external IP packet 1 includes a connection request and a telephone number or host name TN2 of said terminal T2, said external IP packet 1 inputs to said network node apparatus N1 from said logical terminal LP1, said IP transfer network specifies an external IP address EA2 of said terminal T2 from said telephone number or host name TN2 and sends a connection request notification to said terminal T2 having said external IP address EA2,

said terminal T2 transmits a response notification to said IP transfer network, and said IP transfer network sends said response notification to said terminal T1,

said IP transfer network commands a setting of IP communication records R1 and R2 including internal IP address IA1 and IA2 for discriminating said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, and said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 2 of which source address is said external IP address EA2, said external IP packet 2 is judged at network node apparatus N1 whether an IP capsulation condition is satisfied according to a rule of said IP communication record R1 or not,

when said IP capsulation condition is satisfied, said external IP packet 2 becomes to an internal IP packet 2 of which destination address is said internal IP address IA2 and is transferred in said communication path P12, and an external IP packet 2 which is restored at said network node apparatus N2 is sent to said terminal T2, and

when said terminal T1 transmits a communication cutting-off request to said IP transfer network, said IP transfer network commands a disappear of said IP communication records R1 and R2, and said communication path P12 is disappeared.

11. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, a terminal T1 outside of said IP transfer network is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 outside of said IP transfer network is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2,

said terminal T1 transmits an external IP packet 1 for connecting to said terminal T2 by using a telephone number or host name, wherein said external IP packet 1 includes a connection request and a telephone number or host name TN2 of said terminal T2, said external IP packet 1 inputs to said network node apparatus N1 from said logical terminal LP1, said IP transfer network specifies an external IP address EA2 of said terminal T2 from said telephone number or host name TN2 and sends a connection request notification to said terminal T2 having said external IP address EA2,

said terminal T2 transmits a response notification to said IP transfer network, and said IP transfer network sends said response notification to said terminal T1,

said IP transfer network commands a setting of simple capsulation communication records R1 and R2 including identifiers IA1 and IA2 for discriminating said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, wherein said simple capsulation is that a simple header without a source address is added to an external IP packet, and said simple capsulation communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 2 of which source address is said external IP address EA2, said external IP packet 2 is judged at network node apparatus N1 whether a simple capsulation condition is satisfied according to a rule of said simple capsulation communication record R1 or not,

when said simple capsulation condition is satisfied, said external IP packet 2 becomes to an internal IP packet including said external IP packet 2 and said identifier IA2 and is transferred in said communication path P12, and an external IP packet 2 which is restored at said network node apparatus N2 is sent to said terminal T2, and

when said terminal T1 transmits a communication cutting-off request to said IP transfer network, said IP transfer network commands a disappear of said simple capsulation communication records R1 and R2, and said communication path P12 is disappeared.

12. A terminal-to-terminal communication connection control method with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, plural terminals are connected to said IP transfer network, a terminal T1 is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2, and said IP transfer network holds a set of a telephone number or host name TNj (j=1, 2,3, . . . ) and external IP address EAj of a terminal Tj, an internal IP address IAj for discriminating a logical terminal LPj,

an IP communication record R81 including a discrimination information of said logical terminal LP1 is set in said network node apparatus N1, and an IP communication record R82 including a discrimination information of said logical terminal LP2 is set in said network node apparatus N2,

said terminal T1 transmits an external IP packet 1 in said IP transfer network for connecting to said terminal T2, wherein said external IP packet 1 includes a connection request and said telephone numbers or host names TN2 and a destination address thereof is a connection control request address EA81 which is an address for transferring an external IP packet in said IP transfer network, and said external IP packet inputs to said network node apparatus N1 from said logical terminal LP1,

said network node apparatus N1 inspects an IP capsulation condition to be satisfied by an external IP address in said external IP packet 1 according to a rule of said IP communication record R81,

said external IP packet 1 which said IP capsulation condition is not satisfied is discarded,

when said IP capsulation condition is satisfied, said network node apparatus N1 capsulates said external IP packet 1 and inputs it to said IP transfer network as an internal IP packet, said IP transfer network obtains said telephone numbers or host names TN1 and TN2 from said internal IP packet 1 and further obtains an external IP address EA2 of said terminal T2 and internal IP address IA2 for discriminating said logical terminal LP2 by using said telephone number or host name TN2,

said IP transfer network sends an internal IP packet 2 including a receipt notification, said internal IP packet 2 is converted into an external IP packet 2 including said receipt notification at said network node apparatus N2 and then reaches at said terminal T2,

said terminal T2 transmits an external IP packet 3 that includes a call-on notification for notifying a response preparation start and a destination address thereof is said connection control request address EA82, an external IP address of said external IP packet 3 is judged at said network node apparatus N2 according to an IP capsulation condition defined by said IP communication record R82,

when said IP capsulation condition is satisfied, and said external IP packet 3 becomes to an internal IP packet 3 including said call-on notification and then inputted to said IP transfer network, said IP transfer network forms an internal IP packet 4 including call-on notification and sends it, and said internal IP packet 4 becomes to an external IP packet 4 including said call-on notification at said network node apparatus N1 and then reaches at said terminal T1,

said terminal T2 transmits an external IP packet 5 including a response notification for notifying a response, an IP capsulation condition of said external IP packet 5 is judged at said network node apparatus N2, becomes to an internal IP packet 5 including said response notification and inputs to said IP transfer network, said IP transfer network sends an internal IP packet 6 including said response notification and said external IP address EA2 of said terminal T2, and said internal IP packet 6 becomes an external IP packet 6 including said response notification an said external IP address EM of said terminal T2 at said terminal T1 and then reaches at said terminal T1,

said IP transfer network commands a setting of IP communication records R1 and R2 including discrimination information of said logical terminals LP1 and LP2 for said network node apparatus N1 and N2, and said IP communication records R1 and R2 define a communication path P12 for transferring an internal IP packet between said network node apparatus N1 and N2,

when said terminal T1 transmits an external IP packet 7 of which destination address is said external IP address EA2 of said terminal T2, said external IP packet 7 is judged at network node apparatus N1 whether an IP capsulation condition is satisfied based on administration of said communication record R1 or not,

when said IP capsulation condition is satisfied, said external IP packet 7 is capsulated, said capsulated packet becomes to an internal IP packet 7 that a destination address is said internal IP address IA2 for discriminating said logical terminal LP2 and is transferred in said communication path P12, and it is reversely capsulated at said network node apparatus N2 and then a restored external IP packet 7 is sent to said terminal T2, and

when said terminal T1 transmits an external IP packet 9 that includes a communication cutting-off request and a destination address is said connection control request EA81, an internal IP packet 9 including said communication cutting-off request is inputted to said IP transfer network, said IP transfer network commands a disappear of said communication records R1 and R2.

13. An IP communication system with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus and connection servers, plural terminals are connected to said IP transfer network, a terminal Tj (j=1,2,3, . . . ) is connected to a logical terminal LPj of said network node apparatus via a communication line Lj, said network node apparatus includes an address management table and records set in said address management table, and a communication between said network node apparatus is capable by using said records,

a terminal T1 is connected to a network node apparatus N1 via a communication line L1 and a logical terminal LP1, a terminal T2 is connected to a network node apparatus N2 via a communication line L2 and a logical terminal LP2, a connection server S1 is connected to said network node apparatus N1, a connection server S2 is connected to said network node apparatus N2, and said connection servers S1 and S2 are connected to said network node apparatus N1 and N2 with communication lines in said IP transfer network,

a telephone number or a host name of said terminal T2 and a request for a communication connection to said terminal T2 are sent to said connection server S2 from said terminal T1 via said network node apparatus N1 and said connection server S1, said connection server S2 sends to said terminal T2 a request for communication connection to said terminal T2, and said terminal T2 sends to said connection server S2 a call-on notification for notifying a response preparing start and then sends a response notification,

said network node apparatus N1 sets a record R1 including an address for discriminating said logical terminal LP2 at an address management table H1 in said network node apparatus N1, said network node apparatus N2 sets a record R2 including an address for discriminating said logical terminal LP1 at an address management table H2 in said network node apparatus N2, and said records R1 and R2 define a communication path between said logical terminals LP1 and LP2,

said terminal T1 transfers an IP packet GP1 to said network node apparatus N1, a destination address of said IP packet GP1 is an IP address of said terminal T2, said network node apparatus N1 sends an internal packet NP1 including said IP packet GP1 via said communication path by using said record R1, said network node apparatus N2 restores said IP packet GP1 from said internal packet NP1, and said restored IP packet GP1 is sent to said terminal T2 via said logical terminal LP2, and

said network node apparatus N1 and N2 delete said records R1 and R2 based on a communication cut-off request from said terminal T1 or T2, and the said communication path is deleted.

14. An IP communication system with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, and plural terminals outside of said IP transfer network are connected to network node apparatus via logical terminals,

a terminal T1 is connected to a network node apparatus N1 via a communication line L1 and a logical terminal LP1, a terminal T2 is connected to a network node apparatus N2 via a communication line L2 and a logical terminal LP2, said network node apparatus N1 and N2 are connected each other with communication lines in said IP transfer network, and said network node apparatus N1 and N2 include address management tables H1 and H2 including writable and erasable records R1 and R2,

said terminal T1 sends a connection request and a telephone number or host name TN2 of said destination terminal T2 to said network node apparatus N1 for a connection request to said terminal T2 by using a telephone number or host name, and said network node apparatus N2 sends to said terminal T2 a receipt notification based on said connection request,

said terminal T2 sends to said network node apparatus N2 a call-on notification for notifying a response preparing start and then sends a response notification for notifying a response,

said network node apparatus N1 sets a record R1 including an information for discriminating said logical terminal LP2 at an address management table H1, said network node apparatus N2 sets a record R2 including an information for discriminating said logical terminal LP1 at an address management table H2, and a communication path P12 between said logical terminals LP1 and LP2 is set,

said terminal T1 sends an external IP packet GP1 of said terminal T2 to said network node apparatus N1, said network node apparatus N1 forms an internal IP packet NP1 including said external IP packet GP1 by using said record R1 and sends said internal IP packet NP1 via said communication path P12, and said network node apparatus N2 restores said external IP packet GP1 from said internal IP packet NP1 and sends it to said terminal T2 via said logical terminal LP2, and

said network node apparatus N1 and N2 delete said records R1 and R2 based on a communication cut-off request from said terminal T1 or T2, and the said communication path P12 is deleted.

15. An IP communication system with employment of an IP transfer network according to claim 14, wherein:

a media router MR2 having an external IP address EA2 is connected to said network node apparatus N2 via said communication line L2 in place of said terminal T2, plural telephone machines assigned telephone numbers Qj (j=1,2,3, . . . ) are connected to said media router MR2, said media router MR2 includes a telephone number response table which shows a 1;

1 response between said telephone numbers Qj and source port numbers Pj in external IP packets stored telephone voice to be sent, a telephone machine assigned said telephone number Tj is discriminated from said plural telephone machines based on a destination port number Pj in said external IP packet sent from said terminal T1, and whereby said terminal T1 communicates with a telephone machine assigned said telephone number Tj via said media router MR2.

16. An IP communication system with employment of an IP transfer network according to claim 14, wherein:

in a communication phase between said terminals, said terminals T1 and T2 continues a first communication to send/receive an IP packet set port numbers P1 and P2, and further said terminals T1 and T2 carries out a second communication to send/receive an IP packet set port numbers Q1 and Q2 which are different from said port numbers P1 and P2.

17. An IP communication system with employment of an IP transfer network according to claim 16, wherein:

said first communication is a communication to send/receive data or voice, and said second communication is a communication to send/receive still images, moving images, voice, electronic documents.

18. An IP communication system with employment of an IP transfer network according to claim 14, wherein:

said IP transfer network includes a network node apparatus N3, terminals T5 and T6 having external IP address EA5 and EA6 are connected to said network node apparatus N1 and N3 via communication lines L5 and L6, IP communication records R15 and R51 are set in said network node apparatus N1 and N3,

when said terminal T5 sends an external IP packet being a source external IP address EA5 and a destination external IP address EA6, said external IP packet becomes to an internal IP packet due to a management of said IP communication record R15 in said network node apparatus N1 and then is transferred in said IP transfer network, and

said external IP packet is restored at said network node apparatus N3 due to a management of said IP communication record R51 and reaches at said terminal T6.

19. An IP communication system with employment of an IP transfer network, wherein:

said IP transfer network includes plural network node apparatus, and plural terminals are connected to said IP transfer network,

a terminal T1 is connected to a network node apparatus N1 by a logical terminal LP1 via a communication line L1, a terminal T2 is connected to a network node apparatus N2 by a logical terminal LP2 via a communication line L2, said network node apparatus N1 and N2 are connected each other with communication lines in said IP transfer network, and said network node apparatus N1 and N2 include address management tables H1 and H2 including writable and erasable records,

said terminal T1 sends a connection request and a telephone number or host name TN2 of said destination terminal T2 to said network node apparatus N1 for a connection request to said terminal T2 by using a telephone number or host name, and said network node apparatus N2 sends to said terminal T2 a receipt notification based on said connection request,

said terminal T2 sends to said network node apparatus N2 a call-on notification for notifying a response preparing start and then sends a response notification for notifying a response,

said network node apparatus N2 sets a record R2 including an information for discriminating said logical terminal LP1, said network node apparatus N1 sets a record R1 including an information for discriminating said logical terminal LP2, and said records R1 and R2 define a communication path P12 for transferring an internal IP packet between said logical terminals LP1 and LP2,

when said terminal T1 sends an external IP packet GP1 of a destination address being an external IP address EA2 of said terminal T2, said external IP packet GP1 is simple-capsulated at said network node apparatus N1 based on said record R1, and said simple-capsulation means that a simple header which includes a destination internal address and does not include a source internal address is added to said external IP packet GP1,

said simple-capsulated IP packet becomes to an internal IP packet NP1 of which destination address is said logical terminal LP2 and then is transferred in said communication path P12, and said internal IP packet NP1 includes said external IP packet GP1,

said external IP packet GP1 simple-capsulated and restored at said network node apparatus N2 is transferred to said terminal T2 via said logical terminal LP2, and said simple-capsulation is to delete a simple-header without a source address from said internal IP packet NP1, and

said network node apparatus N1 and N2 delete said records R1 and R2 based on a communication cut-off request from said terminal T1 or T2, and the said communication path P12 is deleted.