JP2001156856A - Method and system for information communication between networks - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information communication system where plural gateways are arranged in networks different by protocols to efficiently perform information communication between terminals belong to respective networks. SOLUTION: Networks A and B are connected by a route X (shown in Fig. 1) where a voice IP gateway 1 is arranged, and networks B and C are connected by routes Y and Z (shown in Fig. 1) where voice IP gateways 2 and 3 are arranged, and terminals a and c are connected to networks A and C, and the voice IP gateway 1 is provided with an information management part 10 consisting of the address of the terminal c in the network C and addresses of voice IP gateways 2 and 3 is the network B, and voice IP gateways 2 and 3 are provided with information management parts 20 and 30 consisting of the address of the terminal a in the network A and the address of the voice IP gateway 1 in the network B, and addresses of voice IP gateways 2 and 3 are selected from the information management part 10 to acquire the address of the terminal c when the terminal a calls the terminal c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information communication system in which a plurality of networks having different protocols are subjected to protocol conversion by a gateway and information communication is performed between terminals belonging to each network. The present invention relates to an inter-network information communication method for performing information communication by disposing a gateway and a system therefor.

[0002]

2. Description of the Related Art Conventionally, information communication between terminals belonging to networks having different protocols is performed by disposing a gateway on a route connecting the networks.
The gateway is an interface device and a program for performing protocol conversion in order to interconnect networks using different protocols, thereby enabling information communication between terminals belonging to the networks having different protocols.

[0003] The gateway has an address translation function for translating an address format difference caused by a protocol difference. In the address translation, an address of a terminal belonging to each network corresponds to an address of a protocol different from the network. This is performed based on the attached address information database.

[0004] The address information database of the connection source gateway is designed so that the connection destination gateway can be uniquely determined.
It is recorded as a one-to-one address conversion format in which one address of one protocol is associated with one address of another protocol different from the one protocol.

[0005]

In a conventional system, when a plurality of gateways are provided between a plurality of networks having different protocols, communication to a terminal belonging to the network can be performed using any of the gateways. Is possible, but since the sender gateway adopts a one-to-one address translation format in which only one gateway is selected in the process of address translation,
No gateway other than the corresponding gateway is operated. For this reason, processing to one gateway occurs in a concentrated manner, congestion of the network line occurs, and the communication speed is reduced. There was a risk that a line connection request was discarded.

Therefore, according to the present invention, even when a plurality of gateways are provided in a plurality of networks having different protocols, information communication between terminals belonging to each network can be efficiently performed by simultaneously operating these gateways. An object of the present invention is to provide an information communication method and a system thereof.

[0007]

According to the present invention, there is provided a network for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to the respective networks. An inter-information communication method, wherein a first network and a second network are connected by a first route provided with a first gateway, and the second and third networks are connected by a second and a third gateway. The second and third routes are connected in parallel, the first terminal and the third terminal are respectively connected to the first and third networks, and the address of the third terminal in the third network is connected to the first gateway. And registering third terminal information including addresses of the second and third gateways in the second network, , A third terminal, and first terminal information including an address of the first terminal in the first network and an address of the first gateway in the second network are registered in advance. When making a call to a terminal, selecting one of the addresses of the second and third gateways from the third terminal information registered in the first gateway to acquire the address of the third terminal This is one of the features.

[0008] The present invention is also an inter-network information communication method for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to each of the networks. And the second network are connected by a first route provided with a first gateway, and the second network is connected to a third network.
A network is connected in parallel by second and third routes provided with second and third gateways, a first terminal and a third terminal are respectively connected to the first and third networks, and an address is provided to the second network. A third server information including an address of the third terminal in the third network and an address of the second and third gateways in the second network; and a first network connected to the address conversion server. The first terminal information including the address of the first terminal and the address of the first gateway in the second network is registered, and when calling from the first terminal to the third terminal, the address is registered. Select one of the second and third gateway addresses from the third terminal information registered in the conversion server And a second feature to get the address of the third terminal information Te.

The present invention also relates to an inter-network information communication method having the first or second feature, wherein the first gateway or the address translation server includes the first gateway or the address translation server.
It is preferable that the gateway registers history information including the history of the addresses of the second and third gateways that have made call requests in the past, and selects the address of the second or third gateway based on the history information. This is the third feature.

The present invention also relates to an inter-network information communication method having the second feature, wherein the second and third gateways are respectively connected to the second and third gateways in the second and third routes. A fourth feature is that band information with the third network is registered, and the address of the second or third gateway is selected based on the band information.

The present invention also relates to an inter-network information communication system for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to each of said networks. And the second network are connected by a first route provided with a first gateway, and the second network and the third network are connected in parallel by second and third routes provided with a second and a third gateway. Then, a first terminal and a third terminal are connected to the first and third networks, respectively, and the address of the third terminal in the third network and the second and second terminals in the second network are connected to the first gateway. A first information management unit for registering third terminal information consisting of addresses of three gateways; In each of the ways, there are provided second and third information management units that register first terminal information including an address of the first terminal in the first network and an address of the first gateway in the second network, When making a call from the first terminal to the third terminal, the third terminal registered in the first information management unit
A fifth feature is that one of the addresses of the second and third gateways is selected from the terminal information to obtain the address of the third terminal.

The present invention is also an inter-network information communication system for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to each of the networks, wherein the first network comprises: And the second network are connected by a first route provided with a first gateway, and the second network and the third network are connected in parallel by second and third routes provided with a second and a third gateway. Connecting a first terminal and a third terminal to the first and third networks, connecting an address translation server to the second network, and connecting the third terminal in the third network to the address translation server; A third address comprising an address and an address of the second and third gateways in the second network.
Terminal information, and an information management unit that registers first terminal information including an address of the first terminal in the first network and an address of the first gateway in the second network is provided, and the first terminal When making a call to the third terminal, one of the addresses of the second and third gateways is selected from the third terminal information registered in the information management unit, and the address of the third terminal information is obtained. This is the sixth feature.

[0013] Further, according to the present invention, in the inter-network information communication system having the fifth or sixth feature, the first gateway has issued a call request to the first information management unit or the information management unit in the past. A seventh feature is that history information including the history of the addresses of the second and third gateways is registered, and the address of the second or third gateway is selected based on the history information.

The present invention also relates to an inter-network information communication system having the fifth or sixth feature, wherein each of the second and third information management units or the information management unit has the second and third paths. The bandwidth information between the second and third gateways and the third network is registered, and an address of the second or third gateway is selected based on the bandwidth information. And

The gateway is a kind of repeater for enabling information communication between networks having different protocols, and the gateway employed in some embodiments of the present invention has the following functions. That is, in order to be able to select a plurality of gateways connected between networks with different protocols, one address of one protocol is associated with a plurality of addresses of another protocol different from the one protocol, An address conversion control / management function that allows selection from among the plurality of addresses to perform conversion (one-to-many address conversion) is provided. In address translation,
The routing using past address selection history information and bandwidth information of a path connecting a gateway of the converted address and a network to which the connection destination terminal belongs, in order to determine a converted address when there are a plurality of converted addresses. Control and management functions shall be provided. The address conversion control / management function is accompanied by an address information database for recording address conversion information. The routing control / management function includes a selection history database that records past address selection history information necessary for executing routing control, and band information of a route connecting a network to which a connection destination terminal belongs and a gateway connected to the network. A bandwidth information database to be recorded is attached. And
These functions enable simultaneous operation of multiple gateways in parallel connection.

In one embodiment of the present invention, the above-described routing control / management function can be omitted. In one embodiment of the present invention, the address translation database function and the routing control / management function can be delegated to another independent device (address translation server).

[0017]

Next, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the present invention is not limited to the present embodiment.

<First Embodiment> FIG. 1 shows a first embodiment of an information communication system according to the present invention. In the figure, reference symbol S indicates an information communication system.

As shown in FIG.
Connects gateways (first, second, and second) with telephone networks A and C (first and third networks) having different protocols and a so-called Internet (second network) B which is an IP network constructed worldwide. 3 gateways) 1, 2, 3
(First, second and third routes) are connected by a, b and c, and information communication between telephones (first and third terminals) a and c belonging to the telephone networks A and C is performed. This is an information communication system between networks.

The voice IP gateway 1 includes a telephone number (address) of the telephone c in the telephone network C and IPs of the voice IP gateways 2 and 3 in the Internet network B.
(Internet protocol) There is provided an information management unit 10 in which terminal information (third terminal information) of the telephone c including an address (address) is registered.
3 respectively, the telephone number (address) of the telephone a in the telephone network A and the voice IP in the Internet network B
Information management units 20 and 30 are provided in which terminal information of the telephone a comprising the IP address of the gateway 1 is registered.

The information management unit 10 includes an address conversion control / management unit 11 and a routing control / management unit 12 for allowing one-to-many address conversion. The address conversion control / management unit 11 includes an address information database 1
The routing control / management unit 12 includes a selection history database (history information) 120.
And a bandwidth information database 121.

The address information database 110 stores one telephone number (the telephone number of the telephone c) for one-to-many address conversion for connection to the telephone c connected to the telephone network C. Two IP addresses (IP addresses of the voice IP gateways 2 and 3) are registered.

The selection history database 120 has a voice IP
The IP addresses of the voice IP gateways 2 and 3 to which the gateway 1 has transmitted the call request are registered as a history.

In the band information database 121, band information between the voice IP gateway 1 and the telephone network A on the route A is registered. Voice information includes voice IP
It includes the maximum bandwidth that can be used between the gateway 1 and the telephone network A, the remaining bandwidth that is not used in the route A, and the required bandwidth required for one communication.

Similarly, the information management units 20 and 30 of the voice IP gateways 2 and 3 include the address conversion control / management unit 2
1, 31 and routing control / management units 22, 32. The address conversion control / management units 21, 31 have address information databases 210, 310. History databases 220 and 320 and bandwidth information database 2
21, 321 have been constructed.

The IP addresses of the voice IP gateway 1 are registered in the address information databases 20 and 30 with respect to the telephone number of the telephone a, respectively, and the voice IP gateways 2 and 3 are generated in the selection history databases 220 and 320, respectively. The IP address of the voice IP gateway 1 that has transmitted the call request is registered as a history.

The band information databases 221, 32
1 is a voice IP gateway for routes B and C.
Band information between the telephone network C and the telephone network C is registered. The bandwidth information includes the maximum bandwidth that can be used between the voice IP gateways 2 and 3 and the telephone network C, the remaining bandwidth that is not used in the routes B and C, and the required bandwidth required for one communication. included.

Next, an embodiment of the inter-network information communication method according to the present invention will be described based on the connection sequence in the inter-network information communication system S with reference to FIG.

When the caller transmits a connection request from telephone a to telephone c, the connection request is transmitted to voice IP gateway 1 (step 201).

Upon receiving the connection request, the voice IP gateway 1 accesses the address conversion control / management unit 11 (step 202), and uses the telephone number requested by the telephone a to connect the telephone network C to which the telephone c of the telephone number belongs. The IP addresses of the voice IP gateways 2 and 3 connected to the IP address are obtained. At this time, access is made to the routing control / management unit 12 to select one of the IP addresses (step 203).

Then, the IP address of the voice IP gateway which has not been selected last time is selected from the selection history database 120 attached to the routing control / management unit 12, and the IP address is returned to the address translation control / management unit 11 (step). 204). Here, it is assumed that the IP address of the voice IP gateway 2 has been selected. The address conversion control / management unit 11 outputs the IP address of the voice IP gateway 2 to the voice IP gateway 1 as an output (step 205), and the voice IP gateway 1 sends the IP address of the calling voice IP gateway to the target IP address. A call packet including an address, a caller telephone number, and a callee telephone number is transmitted (step 206).

The voice IP gateway 2 having received the call packet accesses the routing control / management unit 22 and
A request is made for band information of a route B connecting the own voice IP gateway 2 and the telephone network C (step 207). The routing control / management unit 22 includes an accompanying band information database 221.
(Step 208).
Then, if the remaining amount of the bandwidth of the route B does not satisfy the amount required for communication, a retransmission request is transmitted to the voice IP gateway 1 of the calling source (step 209).

Voice IP gateway 1 that has received the retransmission request obtains the IP address of another gateway again in the same procedure as in steps 202 to 205 (step 210). Here, it is assumed that the IP address of the voice IP gateway 3 has been selected.

The voice IP gateway 1 transmits a call packet including the IP address of the call source voice IP gateway, the call source telephone number, and the call destination telephone number to the target IP address (step 211).

The voice IP gateway 3 which has received the call packet checks the use condition of the band between the voice IP gateway 3 and the telephone network C in the route C in the same manner as in steps 207 to 208 (step 212). . Then, when the use state of the band sufficiently satisfies the call request amount, the voice IP gateway 3 transmits a call request to the telephone set c (step 213).

When a ring is generated in the telephone c and the receiver goes off-hook, the telephone c
Is received (step 214).

The voice IP gateway 3 that has detected the incoming signal of the telephone c updates the selection history database (step 215), and transmits a connection packet to the voice IP gateway 1 (step 216). And voice I
P gateway 1 sends a response signal to telephone a (step 217). As a result, two-way real-time communication is established between the telephone a and the telephone c (step 218).

As described above, according to the information communication system S of the present embodiment, a plurality of voice IP gateways can be arranged on networks having different protocols, such as a telephone network and an Internet network, and can be operated simultaneously. Information communication between terminals belonging to each network can be performed efficiently. Also, by connecting a plurality of voice IP gateways, various processes such as address conversion and routing control are distributed to each voice IP gateway, so that the load on each voice IP gateway is dispersed to avoid congestion. Can be. In particular,
By using the selection history and the bandwidth information database in the routing control / management unit, it is possible to prevent the same address being selected twice at the time of address translation, and to acquire the bandwidth information of the communication path,
Since it is possible to determine whether communication is possible based on the remaining bandwidth of the path between the telephone network to which the call destination telephone belongs and the voice IP gateway connected to the Internet, it is possible to reliably avoid traffic congestion. .

<Second Embodiment> FIG. 3 shows a second embodiment of the present invention. In the present embodiment, the information management unit of each voice IP gateway in the first embodiment is delegated to an address conversion server to perform unified management of an address information database, a selection history, and band information. is there. In the figure, the same reference numerals are given to the same parts as those in FIG. 1, and the description thereof will be omitted.

As shown in FIG. 3, the inter-network information communication system S of the present embodiment is such that an address translation server 4 having an information management unit 40 is connected to the Internet B.

Information management unit 40 of address translation server 4
Are the address translation control / management unit 41 and the routing control / management unit 42 for allowing one-to-many address translation.
It has. An address information database 410 is constructed in the address conversion control / management unit 41, and a selection history database 420 and a band information database 421 are constructed in the routing control / management unit 42.

The address information database 42 stores one telephone c so that one-to-many address conversion for connection to the telephone c connected to the telephone network C can be performed.
Two IP addresses (IP addresses of the voice IP gateways 2 and 3) are registered with respect to the telephone number, and the IP address of the voice IP gateway 1 with respect to the telephone number of the telephone set a.

The selection history database 420 has a voice IP
The IP addresses of the voice IP gateways 2 and 3 to which the gateway 1 has transmitted the call request, and the voice IP gateways 2 and 3
3 transmits the call request, the IP of the voice IP gateway 1
Each address is registered as a history.

The band information database 421 stores band information between the voice IP gateway 1 and the telephone network A on the route A, and band information between the voice IP gateways 2 and 3 and the telephone network C on the routes B and C. Are registered respectively. In the bandwidth information database 421, the maximum bandwidth that can be used between the voice IP gateway 1 and the telephone network A and between the voice IP gateways 2 and 3 and the telephone network C, and are not used in the routes A, B, and C. The remaining bandwidth and the required bandwidth required for one communication are registered.

Hereinafter, an embodiment of the inter-network information communication method according to the present invention will be described based on a connection sequence in the inter-network information communication system S with reference to FIG.

When the caller transmits a connection request from telephone a to telephone c (step 401), the connection request is transmitted to voice IP gateway 1.

Voice IP gateway 1 receiving connection request
Sends an address translation request including the call destination telephone number to the address translation server 4 (step 402).

Upon receiving the address translation request, the address translation server 4 accesses the address translation control / management unit 41 (step 403). The address translation control / management unit 41 transmits the call destination telephone c included in the address translation request.
The IP address of the voice IP gateway connected to the telephone network C in which the telephone c is located is obtained from the telephone number of the telephone c. At this time, the routing control / management unit 42 is accessed to select one of the IP addresses. (Step 404).

The routing control / management unit 42 has an associated selection history database 420 and band information database 4
21 to obtain the selection history information of the past two IP addresses and the band information connecting the connection destination telephone c and the voice IP gateways 2 and 3 on the route C, and establish connection based on these two types of information. A suitable voice IP gateway is selected and returned to the address translation control / management unit 41 (step 405). In the present embodiment, the audio IP
It is assumed that the IP address of the gateway 2 has been selected.

The address conversion control / management section 41 returns the IP address to the address conversion server 4 (step 4).
06), the address translation server 4 updates the selection history database of the routing control management unit 42 (step 407), and then sends the IP address to the voice IP gateway 1 of the calling source.
The address is returned (step 408).

The voice IP gateway 1 transmits a call packet including the IP address of the call source voice IP gateway 1, the caller telephone number, and the callee telephone number to the target IP address (step 409). .

The voice IP gateway 2 having received the call packet transmits a call request to the telephone set c (step 410).

Then, a ring is generated in the telephone c, and when the receiver goes off-hook, an incoming signal is transmitted from the telephone c to the voice IP gateway 3 (step 411).

The voice IP gateway 3 having detected the incoming signal of the telephone c transmits a connection packet to the voice IP gateway 1 (step 412).
Sends a response signal to the telephone a (step 413).
As a result, two-way real-time communication is established between the telephone a and the telephone c (step 414).

As described above, according to the inter-network information communication system S of this embodiment, the address translation control / management unit and the routing control / management unit are delegated to the address translation server 4 independent of each voice IP gateway. In addition, since the address information database, the selection history, and the band information can be centrally managed, information communication between the telephones a and c can be performed more efficiently.

According to the present invention, as in the first and second embodiments, the information registration unit has both the address translation control / management unit and the routing control / management unit, and the routing control / management unit has the selection history. Although it is preferable to construct a database and a band information database, as in the embodiment described below, a routing control / management unit having only a selection history database (third embodiment), an address conversion control -Only the management unit may be provided (fourth embodiment).

<Third Embodiment> FIG. 5 shows a third embodiment of the present invention. In the present embodiment, since the band information database in the unused routing control / management unit in the first embodiment is omitted, the same reference numerals are given to the same parts as those in the first embodiment in FIG. Is omitted.

Hereinafter, the inter-network information communication method according to the present invention will be described based on a connection sequence in the inter-network information communication system S with reference to FIG.

The caller transmits a connection request from telephone a to telephone c (step 601).

The voice IP gateway 1 accesses the address conversion control / management unit 11 (step 602), and is connected to the telephone network C in which the telephone having the telephone number exists using the telephone number requested by the telephone a. Obtain the IP address of the voice IP gateway. Since two IP addresses are registered in the address information database 110, access is made to the routing control / management unit 12 to select one of the IP addresses (step 6).
03).

The history of the IP address selected so far is recorded in the selection history database 120 attached to the routing control / management unit 12, and the IP address of the voice IP gateway which was not selected last time is selected. The IP address is returned to the conversion control / management unit 11 (step 604). Here, it is assumed that the IP address of the voice IP gateway 2 has been selected. The address conversion control / management unit 11 outputs the IP address of the voice IP gateway 2 to the voice IP gateway 1 as an output (step 605), and the voice IP gateway 1 sends the IP address of the calling voice IP gateway to the target IP address. A call packet including an address, a caller telephone number, and a callee telephone number is transmitted (step 606).

The voice IP gateway 2 which has received the call packet reads the call destination telephone number and transmits a call request to the telephone c (step 607).

When a ring is generated in the telephone c and the receiver goes off-hook, the telephone c outputs a voice IP gateway 2
Is transmitted (step 608).

The voice IP gateway 2 that has detected the incoming signal of the telephone c transmits a connection packet to the voice IP gateway 1 (step 609), and the voice IP gateway 1 updates the selection history database 120 of the routing control / management unit 12. (Step 610), the telephone a
(Step 611). as a result,
Two-way real-time communication is established between the telephones a and c (step 612).

As described above, according to the inter-network information communication system S of this embodiment, it is possible to arrange a plurality of voice IP gateways on networks having different protocols such as the telephone network and the Internet network and operate them simultaneously. Therefore, information communication between terminals belonging to each network can be efficiently performed. Also, by connecting a plurality of gateways, various processes such as address conversion and routing control are distributed to each gateway, so that the load on each gateway can be distributed and a congestion state can be avoided.

<Fourth Embodiment> FIG. 7 shows a fourth embodiment of the present invention. In the present embodiment, the routing control / management unit in the first embodiment is omitted, and the same parts as those in the first embodiment are denoted by the same reference numerals in FIG.

Hereinafter, with reference to FIG. 8, one embodiment of the inter-network information communication method of the present embodiment will be described based on the connection sequence of the inter-network information communication system S of the above embodiment.

When the caller transmits a connection request from telephone a to telephone c (step 801), the connection request is transmitted to voice IP gateway 1.

The voice IP gateway 1 accesses the address conversion control / management unit 11 (step 802), and is connected to the telephone network C in which the telephone having the telephone number exists using the telephone number requested by the telephone a. The IP address of the voice IP gateway is obtained (step 803). Here, the IP of the voice IP gateway 2
Assume that an address has been selected. Voice IP gateway 1
Transmits a call packet including the IP address of the call source voice IP gateway, the call source telephone number, and the call destination telephone number to the target IP address (step 804).

Upon receiving the call packet, the voice IP gateway 2 reads the call destination telephone number and transmits a call request to the telephone c (step 805).

When a ring is generated in the telephone c and the handset goes off-hook, the telephone c
Is received (step 806).

The voice IP gateway 2 which has detected the incoming signal of the telephone c transmits a connection packet to the voice IP gateway 1 (step 807), and the voice IP gateway 1 transmits a response signal to the telephone a (step 80).
8). As a result, two-way real-time communication is established between the telephone a and the telephone c (step 809).

As described above, according to the inter-network information communication system S of the present embodiment, a plurality of voice IP gateways can be arranged in networks having different protocols such as the telephone network and the Internet, and these can be operated simultaneously. In addition, information communication between terminals belonging to each network can be efficiently performed. Also, by connecting a plurality of voice IP gateways, the address translation is distributed to each voice IP gateway, so that the load on each voice IP gateway can be distributed and a congestion state can be avoided.

The present invention is particularly preferably applied to, but is not limited to, the information communication by voice between telephones belonging to each telephone network connected via the Internet network as in the above embodiments. Instead, the terminal connected to each telephone network may be any of a telephone, a facsimile / telephone, a personal computer connected via a modem, or a combination thereof. In the case of a facsimile, information communication by facsimile signals can be performed, and in the case of a computer, information communication according to the intended use can be performed by installing Internet telephone software or facsimile software.

The present invention is suitable for inter-network information communication between the telephone network and the Internet as in the above embodiments,
Network, local area network (LA
N), it goes without saying that the present invention can also be applied to inter-network information communication between a telephone network and another packet switching communication network such as an ATM (Asynchronous Transfer Mode) network or a frame relay network.

In each of the above embodiments, one-to-many address conversion is described by using two paths for connecting the network (telephone network C) to which the connection destination terminal (telephone c) belongs and the packet communication network (Internet B). However, it is needless to say that this route is not limited to two routes, and can be applied to a case where there are three or more routes.

[0077]

According to the present invention, the following effects can be obtained.

According to the inter-network information communication method having the above first to fourth features, one address of a certain protocol is associated with a plurality of addresses of a protocol different from the protocol by the address conversion control / management function. Thus, one-to-many address conversion can be performed, and efficient simultaneous operation by connecting a plurality of gateways in parallel is possible. Also, by connecting a plurality of gateways, various processes such as address conversion and routing control are distributed to each gateway, so that the load on each gateway can be distributed.

According to the inter-network information communication system having the above-mentioned fifth to eighth features, each of the above-mentioned methods can be suitably performed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a first embodiment of an information communication system according to the present invention.

FIG. 2 is a sequence diagram showing an operation in the information communication system of the embodiment.

FIG. 3 is a schematic diagram showing a second embodiment of the information communication system according to the present invention.

FIG. 4 is a sequence diagram showing an operation in the information communication system of the embodiment.

FIG. 5 is a schematic diagram showing a third embodiment of the information communication system according to the present invention.

FIG. 6 is a sequence diagram showing an operation in the information communication system of the embodiment.

FIG. 7 is a schematic diagram showing a fourth embodiment of the information communication system according to the present invention.

FIG. 8 is a sequence diagram showing an operation in the information communication system of the embodiment.

[Explanation of symbols]

1: Voice IP gateway (first gateway) 2:
Voice IP gateway (second gateway), 3: Voice IP gateway (third gateway), 4: address translation server, 10, 20, 30: information management unit, A: telephone network (first network), B: Internet network (Second
Network), C: telephone network (third network),
S: Inter-network information communication system, A: First route,
B: Second route, C: Third route.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Okada 180 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Hitachi Communication Systems Co., Ltd. F-term (reference) in Communication Systems Co., Ltd. 5K030 HD03 HD09 KA05 LB02 LB05 5K034 FF11 FF13 HH61 5K051 CC00 GG02 JJ04 5K101 LL00 PP03 9A001 CC06 CC07 JJ18 KK60

Claims (8)

[Claims] 1. An inter-network information communication method for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to each of said networks, comprising: a first network and a second network. Are connected in parallel on a first route provided with a first gateway, and the second network and the third network are connected in parallel on second and third routes provided with a second and third gateway. 1, connecting a first terminal and a third terminal to a third network, respectively, and connecting the first gateway to an address of the third terminal in the third network and an address of the second and third gateways in the second network. In addition to registering the third terminal information consisting of
In each of the gateways, first terminal information including an address of the first terminal in the first network and an address of the first gateway in the second network is registered, and the first terminal information from the first terminal to the third terminal is registered. In making a call, the network selects one of the addresses of the second and third gateways from the third terminal information registered in the first gateway and acquires the address of the third terminal. Information communication method. 2. An inter-network information communication method for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to each of said networks, comprising: a first network and a second network. Are connected by a first route provided with a first gateway, and the second network and the third network are connected in parallel by second and third routes provided with a second and a third gateway. 1, a first terminal and a third terminal are respectively connected to a third network, an address translation server is connected to the second network, and an address of the third terminal in the third network and the Third terminal information including addresses of the second and third gateways in the second network, and the first network. Registering first terminal information including an address of the first terminal in the network and an address of the first gateway in the second network, and when making a call from the first terminal to the third terminal, An inter-network information communication method, comprising selecting one of the addresses of the second and third gateways from the third terminal information registered in the address translation server and acquiring an address of the third terminal information. 3. The inter-network information communication method according to claim 1, wherein the first gateway or the address translation server receives a call request of the second and third gateways from the first gateway in the past. A method for communicating information between networks, comprising registering history information including a history of addresses and selecting an address of the second or third gateway based on the history information. 4. The inter-network information communication method according to claim 1, wherein the second and third gateways or the address translation server respectively provide the second and third gateways on the second and third routes. Register bandwidth information between the gateway and the third network,
An inter-network information communication method, wherein an address of the second or third gateway is selected based on the band information. 5. An inter-network information communication system for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to each of said networks, comprising: a first network and a second network. Are connected in parallel on a first route provided with a first gateway, and the second network and the third network are connected in parallel on second and third routes provided with a second and third gateway. 1, connecting a first terminal and a third terminal to a third network, respectively, and connecting the first gateway to an address of the third terminal in the third network and an address of the second and third gateways in the second network. And a first information management unit for registering third terminal information comprising the second and third gateways. In addition, the first
Second and third information management units that register first terminal information including an address of the first terminal in the network and an address of the first gateway in the second network are provided. When making a call to a terminal, selecting one of the addresses of the second and third gateways from the third terminal information registered in the first information management unit and acquiring the address of the third terminal An information communication system between networks characterized by the following. 6. An inter-network information communication system for arranging a plurality of gateways between a plurality of networks having different protocols and performing information communication between terminals belonging to each of said networks, comprising: a first network and a second network. Are connected in parallel on a first route provided with a first gateway, and the second network and the third network are connected in parallel on second and third routes provided with a second and third gateway. 1, a first terminal and a third terminal are respectively connected to a third network, an address translation server is connected to the second network, and an address of the third terminal in the third network and the Third terminal information including addresses of the second and third gateways in the second network, and the first terminal An information management unit for registering first terminal information comprising an address of the first terminal in the work and an address of the first gateway in the second network is provided, and a call is made from the first terminal to the third terminal When performing, between the networks, the address of the third terminal information is obtained by selecting one of the addresses of the second and third gateways from the third terminal information registered in the information management unit Information communication system. 7. The inter-network information communication system according to claim 5, wherein said second gateway and said third gateway to which said first gateway has made a call request to said first information management unit or said information management unit in the past. Wherein the history information including the history of the addresses is registered, and the address of the second or third gateway is selected based on the history information. 8. The inter-network information communication system according to claim 5, wherein the second and third information management units or the information management units respectively include the second and third information in the second and third paths. An inter-network information communication system, wherein band information between a third gateway and the third network is registered, and an address of the second or third gateway is selected based on the band information.