JP5260238B2 - Communication control method, network system, gateway device, and communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily utilize a functional service provided in the other network from one network. <P>SOLUTION: In executing inter-terminal data communication between communication terminals ES1, ES2, the communication terminal ES1 and the communication terminal ES2 are connected to a gateway device GW1 and a gateway device GW2, respectively, by peer-to-peer type data communication. Before starting the inter-terminal data communication, hybrid peer-to-peer type data communication (a) through a network NW1 is started between the communication terminal ES1 and the gateway device GW1; and, in ending the inter-terminal data communication, the inter-terminal data communication in the communication terminal ES1 is ended in the gateway device GW1, and thereafter the hybrid peer-to-peer type data communication (a) through the network NW1 with the communication terminal ES1 is ended. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a network connection technique, and more particularly to a technique for interconnecting networks having different communication methods.

When interconnecting networks having different communication methods, network connection techniques such as an interwork method and a capsule method are used. For example, when interconnecting SIP (Session Initiation Protocol) network operators, an interwork method is used in which a gateway function is provided between two networks having different communication methods to perform communication protocol interworking ( For example, refer nonpatent literature 1 etc.).
In dial-up access, a capsule system is used in which an end system establishes a call with a gateway device on the access network, encapsulates signals of other communication protocols on the data channel of the call, and connects to the core network. (See, for example, Non-Patent Document 2).

TTC Standard JJ-90.25, “Technical Specifications for Interconnection Interfaces between Managed Provider SIP Networks”, http://www.ttc.or.jp/e/summary/Inter-Carrier_Signaling_Interface/pdf/sum_JJ-90.25 v1.1.pdf "Dial-Up Technologies", Cisco Documentation, Cisco Systems, Inc., http://www.cisco.com/en/US/docs/internetworking/technology/handbook/Dial_up.html

  However, such a conventional technique has a problem that the function service provided in one network cannot be efficiently used from one network in terms of ASP (Application Service Provider).

  For example, according to the above-described interwork method, a user connected to one network providing only the SIP basic call service compliant with RFC3261 is provided with an extension based on RFC3248 provided on the other network. If you want to use IM (Instant Messenger) service using SIP signals, the call control server of one network to which the user is connected does not support RFC3248, so that the extended SIP signal is transmitted to the other network side. In some cases, the IM service cannot be easily used in an ASP manner.

Also, according to the interwork method, both basic functions services such as user authentication, billing, session monitoring, etc. need to be provided in advance in both networks, so the basic function services provided in one network Cannot be easily used in an ASP manner from the other network.
Also, for example, when the capsule method is adopted for the purpose of passing an extended SIP signal, an overhead for encapsulation occurs, and the amount of data and processing load increase, so the IM service cannot be used efficiently.

  The present invention is for solving such problems, and an object of the present invention is to provide an inter-network connection method that can easily use a function service provided in one network from one network in an ASP manner. It is said.

  In order to achieve such an object, a communication control method according to the present invention includes a first network that provides a data communication service based on a first communication method, and a second network that is different from the first communication method. A network system including a second network that provides a data communication service based on a communication method, and first and second gateway devices that interconnect the first and second networks, respectively, via the network system A communication control method for performing inter-terminal data communication between a first communication terminal and a second communication terminal connected to a first network, wherein the first communication terminal Based on the scheme, the hybrid peer-to-peer type first data communication is started with the first gateway device via the first network. And A, using the network address of the first gateway device acquired by the first communication terminal in the first data communication, call control data related to the inter-terminal data communication based on the second communication method. Step B for exchanging with the first gateway device by peer-to-peer type data communication via the first network, and the first gateway device performing inter-terminal data communication based on the second communication method. Step C for exchanging call control data regarding the second communication terminal and the corresponding second gateway apparatus by hybrid peer-to-peer type data communication via the second network, and the second gateway apparatus Based on the first communication method, a hybrid peer-to-peer type communication is performed with the second communication terminal via the first network. The data communication between terminals based on the second communication method by using the network address of the second communication terminal acquired by the second gateway device in step D in which the second data communication is performed. Step E for exchanging call control data related to the second communication terminal by peer-to-peer type data communication via the first network, and the first communication terminal using the first and second gateway devices Step F for performing inter-terminal data communication based on call control data exchanged with the second communication terminal via the first communication terminal, and the first gateway device performs the inter-terminal data communication at the first communication terminal. Step G for ending the first data communication with the first communication terminal.

  In addition, another communication control method according to the present invention includes a first network that provides a data communication service based on a first communication method, and data based on a second communication method that is different from the first communication method. A network system including a second network that provides a communication service and a gateway device that interconnects the first and second networks, and the first network connected to the first network via the network system Is a communication control method for performing inter-terminal data communication between a second communication terminal and a second communication terminal connected to a second network, wherein the first communication terminal is set to the first communication method. On the basis of the step A for initiating hybrid peer-to-peer type first data communication with the gateway device via the first network; The first communication terminal uses the network address of the gateway device acquired by the first data communication to transmit the call control data related to the inter-terminal data communication to the gateway device based on the second communication method. Step B exchanged by peer-to-peer type data communication via the network of 1 and the gateway device transmits call control data related to inter-terminal data communication with the second communication terminal based on the second communication method. Step C for exchanging by hybrid peer-to-peer type second data communication via the second network, and call control data exchanged between the first communication terminal and the second communication terminal via the gateway device Step F for performing inter-terminal data communication, and the gateway device performs the inter-terminal data transmission at the first communication terminal. After data communication end, and a step G to end the first data communication between the first communication terminal.

  The network system according to the present invention provides a first network that provides a data communication service based on the first communication method, and a data communication service based on a second communication method that is different from the first communication method. A first communication terminal connected to the first network, and a second communication device including a second network to be provided, and first and second gateway apparatuses interconnecting the first and second networks, respectively. The first communication terminal communicates with the first gateway device via the first network on the basis of the first communication method. And an access processing unit that performs hybrid peer-to-peer type first data communication, and a network of the first gateway device acquired by the first data communication. Communication that exchanges call control data related to inter-terminal data communication with the first gateway device by peer-to-peer type data communication via the first network based on the second communication method using the network address. The first gateway device performs hybrid peer-to-peer type first data communication with the first communication terminal via the first network based on the first communication method. And at the end of the inter-terminal data communication, after confirming the end of the inter-terminal data communication in the first communication terminal, based on the second communication method and the access processing unit that ends the first data communication Then, call control data related to inter-terminal data communication is exchanged with the first communication terminal by peer-to-peer type data communication via the first network. Both call control processing units exchange call control data related to inter-terminal data communication between the second communication terminal and the corresponding second gateway device by hybrid peer-to-peer data communication via the second network. And the second gateway device performs hybrid peer-to-peer type second data communication with the second communication terminal via the first network based on the first communication method. Using the network address of the second communication terminal acquired by the second data communication and the call control data related to the inter-terminal data communication with the second communication terminal based on the second communication method. And a call control processing unit that exchanges data by peer-to-peer data communication via the first network, and the second communication terminal uses the first communication method. And an access processing unit that performs hybrid peer-to-peer type second data communication with the second gateway device via the first network, and inter-terminal data communication based on the second communication method. And a communication control processing unit that exchanges call control data with the second gateway device through peer-to-peer data communication via the first network.

  Another network system according to the present invention includes a first network that provides a data communication service based on a first communication method, and a data communication based on a second communication method that is different from the first communication method. A second network that provides a service, and a gateway device that interconnects the first and second networks, respectively, and is connected to the first communication terminal and the second network that are connected to the first network A network system for performing inter-terminal data communication with a second communication terminal, wherein the first communication terminal communicates with the gateway device based on the first communication method in a first Access processing unit for performing first data communication of hybrid peer-to-peer type via network, and gateway device acquired by first data communication Communication control processing for exchanging call control data related to inter-terminal data communication with the gateway device by peer-to-peer type data communication via the first network based on the second communication method using the network address The gateway device performs hybrid peer-to-peer type first data communication with the first communication terminal via the first network based on the first communication method, and between the terminals. At the end of the data communication, after confirming the end of the inter-terminal data communication in the first communication terminal, the inter-terminal data based on the access processing unit that ends the first data communication and the second communication method When call control data related to communication is exchanged with the first communication terminal by peer-to-peer type data communication via the first network. And a call control processing unit for exchanging call control data related to inter-terminal data communication with the second communication terminal through hybrid peer-to-peer data communication via the second network. A communication control processing unit that exchanges call control data related to inter-terminal data communication with the gateway device by hybrid peer-to-peer data communication via the second network based on the second communication method; Is included.

The gateway device according to the present invention provides a first network that provides a data communication service based on a first communication method, and a data communication service based on a second communication method that is different from the first communication method. A second network to be provided and one or more gateway devices connecting the first and second networks, and the first communication terminal and the second communication terminal connected to the first network A gateway device used in a network system for performing inter-terminal data communication between terminals, and establishing a first communication by a first communication method with a first communication terminal, to a second network use an access processing unit for notifying the address of the gateway apparatus for accessing, from a first communication terminal, the address of the second communication method Call control processing for receiving a communication request received through the second network based on the communication request and performing communication necessary for performing data communication between the first communication terminal and the second communication terminal. Department.

In addition, a communication terminal according to the present invention provides a first network that provides a data communication service based on a first communication method, and a data communication service based on a second communication method that is different from the first communication method. Inter-terminal data communication with another communication terminal including a second network to be provided and a plurality of gateway devices interconnecting the first and second networks, respectively, and connected to the first network A communication terminal used in a network system that performs hybrid peer-to-peer type first data communication with a gateway device via a first network based on a first communication method, and a terminal At the end of the inter-data communication, the access processing unit for ending the first data communication after ending the inter-terminal data communication, Peer-to-peer type call control data related to inter-terminal data communication with the gateway device via the first network based on the second communication method using the network address of the gateway device acquired by data communication And a communication control processing unit for exchanging by data communication.
Another communication terminal according to the present invention includes a first network that provides a data communication service based on a first communication method, and a data communication based on a second communication method that is different from the first communication method. Between a second network that provides a service and one or more gateway devices that connect the first and second networks, and another communication terminal connected to the first network a communication terminal used in a network system for performing data communication, with the gateway device, to establish a first communication using the first communication method, the gateway device to access the second network gateway by using the access processing unit for obtaining the address, the communication request based on the second communication method, the address obtained by the first communication By submitting to the location, and a communication control processing unit that requests the start of communication between the second communication terminal via the gateway device and a second network.

According to the present invention, call control data for using the function service of the other network can be easily transmitted through one network to which the communication terminal is connected. Therefore, it is not necessary to correspond to the communication method of one network. Therefore, the function service provided in the other network can be easily used from one network as an ASP.
In addition, the hybrid peer-to-peer data communication between the communication terminal and the gateway device via one network can confirm the start and end of service use provided by the other network, and use the function service of the other network. Even in this case, the basic functions of one network such as user authentication, billing, and session monitoring can be used simultaneously.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a network system according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the network system according to the first embodiment of the present invention.

  The network system 1 includes a network NW1 (first network) that provides a data communication service based on the communication method CP1 (first communication method), and a communication method CP2 (second communication method) that is different from the communication method CP1. ) Based on the network NW2 (second network) and gateway devices GW1 and GW2 (first and second gateway devices) interconnecting the networks NW1 and NW2, respectively, It has a function of performing inter-terminal data communication between the communication terminal ES1 (first communication terminal) and the communication terminal ES2 (second communication terminal) connected to the NW1.

  The network NW1 is provided with a call control server CF1, and provides various data communication services based on the communication scheme CP1 for data communication using the network NW1. Similarly, the network NW2 is provided with a call control server CF2, and provides various data communication services based on the communication method CP2 for data communication using the network NW2. Note that these call control servers CF1 and CF2 are general call control servers used in SIP and the like, and detailed description thereof is omitted here.

[Configuration of communication terminal]
Next, a communication terminal used in the network system according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of a communication terminal used in the network system according to the first embodiment of the present invention.

  The communication terminal ES1 is composed of a communication device such as a general server device, personal computer, IP phone device, mobile phone, PDA as a whole, and a communication interface unit (hereinafter referred to as a communication I / F unit) as a main functional unit. ) 11, a storage unit 12, a user interface unit (hereinafter referred to as a user I / F unit) 13, an access processing unit 14, a communication control processing unit 15, and a data communication unit 16. Are connected to each other.

The communication I / F unit 11 includes a dedicated communication circuit, and has a function of performing data communication with various communication devices via the network NW1.
The storage unit 12 includes a storage device such as a hard disk or a memory, and has a function of storing processing information and programs necessary for various processing operations in the communication terminal ES1.
The user I / F unit 13 includes an operation input device such as a keyboard and a mouse, a screen display device such as an LCD, a call circuit, and the like, and has a function of exchanging various types of information between the communication terminal ES1 and the user. Yes.

  When performing inter-terminal data communication with the communication terminal ES2 as a communication partner via the network NW1 or the network NW2, the access processing unit 14 communicates with the gateway device GW1 based on the communication method CP1. A function of performing hybrid peer-to-peer data communication a with the device GW1 via the call control server CF1 of the network NW1, and at the end of the inter-terminal data communication, after confirming the end of the inter-terminal data communication, the gateway device And a function of terminating the data communication a with the GW 1.

The communication control processing unit 15 uses the network address of the gateway device GW1 acquired in the data communication a to transmit call control data related to inter-terminal data communication with the gateway device GW1 based on the communication method CP2. And a function of saving setting information for data communication processing in the storage unit 22 based on the call control data.
The data communication unit 16 has a function of performing inter-terminal data communication with the communication terminal ES2 based on the setting information in the storage unit 22.

The access processing unit 14, the communication control processing unit 15, and the data communication unit 16 may be constructed using dedicated hardware, or these various processing units may be executed by executing a program with a microprocessor such as a CPU. May be constructed.
Also, the configuration of the communication terminal ES2 is assumed to have the same configuration as that of the communication terminal ES1 described above.

[Gateway device]
Next, a gateway device used in the network system according to the first embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing a configuration of the gateway device used in the network system according to the first embodiment of the present invention.

  The gateway device GW1 is composed of a communication device such as a general server device as a whole, and includes a communication interface unit (hereinafter referred to as a communication I / F unit) 21, a storage unit 22, and a user interface unit (hereinafter referred to as a main function unit). 23), an access processing unit 24, a call control processing unit 25, and a relay processing unit 26, and these functional units are connected to each other via an internal bus.

The communication I / F unit 21 includes a dedicated communication circuit and has a function of performing data communication with various communication devices via the networks NW1 and NW2.
The storage unit 22 includes a storage device such as a hard disk or a memory, and has a function of storing processing information and programs necessary for various processing operations in the gateway device GW1.
The user I / F unit 23 includes an operation input device such as a keyboard and a mouse, a screen display device such as an LCD, a call circuit, and the like, and has a function of exchanging various types of information between the gateway device GW1 and an operator. Yes.

  When the communication terminals ES1 and ES2 perform data communication via the network NW1 and further the network NW2, the access processing unit 24 establishes a call control server CF1 of the network NW1 with the communication terminal ES1 based on the communication scheme CP1. Function for performing hybrid peer-to-peer type data communication via the terminal, and at the end of inter-terminal data communication, after confirming the end of inter-terminal data communication at the communication terminal ES1, between the communication terminal ES1 and the gateway device GW1 It has a function of terminating data communication a.

  The call control processing unit 25 has a function of exchanging call control data related to inter-terminal data communication with the communication terminal ES1 based on the communication scheme CP2 by the peer-to-peer type data communication b via the network NW1, and communication. A function of exchanging call control data related to inter-terminal data communication with the gateway apparatus GW2 via the call control server CF2 of the network NW2 by the hybrid peer-to-peer type data communication c based on the scheme CP2. And a function of saving setting information for relay transfer processing in the storage unit 22 based on the data.

  The relay processing unit 26 has a function of relaying and transferring communication data between the network NW1 and the network NW2 based on the setting information in the storage unit 22.

These access processing unit 24, call control processing unit 25, relay processing unit 26, and communication end processing unit 27 may be constructed using dedicated hardware, or a program is executed by a microprocessor such as a CPU. These processing units may be constructed accordingly.
The configuration of the gateway device GW2 is assumed to have the same configuration as that of the gateway device GW2 described above.

[Operation of First Embodiment]
Next, the operation of the network system according to the first embodiment of the present invention will be described. Here, it is assumed that the network NW1 is a SIP network that provides a SIP basic call service, the network NW2 is a SIP network that provides an additional service using an extended SIP signal, and the communication terminal ES1 performs an additional service of the network NW2. A case will be described as an example where inter-terminal data communication such as a VoIP call is performed with the communication terminal ES2 using the network NW1 in an APS manner.

  The main operation of the network system 1 is as follows: a terminal registration processing operation from the communication terminals ES1 and ES2 to the call control servers CF1 and CF2, and between the terminals between the communication terminals ES1 and ES2 performed after the terminal registration processing operation. There is data communication operation. In the following, each of these processing operations will be described individually.

[Terminal registration processing operation]
First, the terminal registration processing operation in the network system according to the first embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sequence diagram showing a terminal registration processing operation in the network system according to the first embodiment of the present invention.

The network system 1 starts the terminal registration processing operation of FIG. 4 in response to the terminal registration request operation at the communication terminals ES1 and ES2.
First, the communication terminal ES1 transmits a terminal registration request (CP1-REGISTER) to the call control server CF1 of the network NW1 by the access processing unit 14 based on the communication method CP1, and receives a response (CP1-200) from the call control server CF1. OK) is returned (step 100). Thereby, a set of the SIP-URL and the IP address of the communication terminal ES1 is registered in the call control server CF1.

Similarly, a terminal registration request (CP1-REGISTER) is transmitted from the communication terminal ES2 to the call control server CF1, and a response (CP1-200 OK) is returned from the call control server CF1 (step 101). Thereby, a set of the SIP-URL and the IP address of the communication terminal ES2 is registered in the call control server CF1.
It is assumed that a set of the SIP-URL of the network NW2 and the IP addresses of the gateway devices GW1 and GW2 is registered in advance in the call control server CF1. Here, it is assumed that gateway device GW1 is assigned in advance to communication terminal ES1, and gateway device GW2 is assigned in advance to communication terminal ES2.

Next, the communication terminal ES1 transmits a communication request (CP1-INVITE) to the network NW2 by hybrid peer-to-peer data communication based on the communication method CP1 by the access processing unit 14 (step 103).
At this time, the SIP-URL of the network NW2 specified by the communication request is resolved to the IP address of the gateway device GW1 by the call control server CF1, and the communication request is transferred to the gateway device GW1.

In response to this communication request, the gateway device GW1 performs hybrid peer-to-peer data communication with the communication terminal ES1 by the access processing unit 24 based on the communication method CP1, and receives a response (CP1-200 OK) between the two. ), Response confirmation (CP1-ACK), disconnection (CP1-BYE), and response (CP1-200 OK) are exchanged in order.
Thereby, the IP address of the gateway device GW1 is notified from the gateway device GW1 to the communication terminal ES1 via the call control server CF1. Thereafter, the hybrid peer-to-peer data communication between the communication terminal ES1 and the gateway device GW1 is terminated in response to the disconnection (CP1-BYE) from the communication terminal ES1.

Similarly, a communication request (CP1-INVITE) for the network NW2 is transmitted from the communication terminal ES2 by hybrid peer-to-peer data communication based on the communication scheme CP1 (step 104).
At this time, the SIP-URL of the network NW2 designated by the communication request is resolved to the IP address of the gateway device GW2 by the call control server CF1, and the communication request is transferred to the gateway device GW2.

In response to this communication request, the gateway device GW2 performs hybrid peer-to-peer data communication with the communication terminal ES2 based on the communication method CP1 by the access processing unit 24, and receives a response (CP1-200 OK) between the two. ), Response confirmation (CP1-ACK), disconnection (CP1-BYE), and response (CP1-200 OK) are exchanged in order.
Thereby, the IP address of the gateway device GW2 is notified from the gateway device GW2 to the communication terminal ES2 via the call control server CF1. Thereafter, in response to disconnection (CP1-BYE) from the communication terminal ES2, the hybrid peer-to-peer type data communication between the communication terminal ES1 and the gateway device GW2 ends.

Next, the communication terminal ES1 uses the IP address of the gateway device GW1 acquired in step 103 by the communication control processing unit 15 to perform terminal communication with the gateway device GW1 by peer-to-peer data communication based on the communication method CP2. A registration request (CP2-REGISTER) is transmitted (step 105).
In response to this terminal registration request, the gateway device GW1 transfers the terminal registration request to the call control server CF2 of the network NW2 by data communication based on the communication scheme CP2 by the call control processing unit 25.

At this time, the call control processing unit 25 replaces the source address information (Concat: ES1 IP-ADR) included in the terminal registration request with its own IP address (Concat: GW1 IP-ADR) (step 105A). ) And transfer the terminal registration request.
After terminal registration, a response (CP2-200 OK) is returned from the call control server CF2 to the gateway device GW1, and in response thereto, a response (CP2-200 OK) is returned from the gateway device GW1 to the communication terminal ES1.

Similarly, the communication terminal ES2 uses the IP address of the gateway device GW2 acquired in step 104 by the communication control processing unit 15 to perform the peer-to-peer data communication to the gateway device GW2 based on the communication method CP2. A terminal registration request (CP2-REGISTER) is transmitted (step 106).
In response to the terminal registration request, the gateway device GW2 transfers the terminal registration request to the call control server CF2 of the network NW2 by data communication based on the communication scheme CP2 by the call control processing unit 25.

At this time, the call control processing unit 25 replaces the source address information (Concat: ES2 IP-ADR) included in the terminal registration request with its own IP address (Concat: GW2 IP-ADR) (step 106A). ) And transfer the terminal registration request.
After terminal registration, a response (CP2-200 OK) is returned from the call control server CF2 to the gateway device GW2, and in response, a response (CP2-200 OK) is returned from the gateway device GW2 to the communication terminal ES2.

In this way, a series of terminal registration operations are completed, and a set of the SIP-URL of the communication terminal ES1 and the IP address of the gateway device GW1 is registered in the call control server CF2, and the SIP- of the communication terminal ES2 is registered. A set of the URL and the IP address of the gateway device GW2 is registered (step 107).
Note that the above-described terminal registration operation is also executed in common in each embodiment described later.

[Data communication between terminals]
Next, an inter-terminal data communication operation in the network system according to the first embodiment of the present invention will be described with reference to FIG. FIG. 5 is a sequence diagram showing an inter-terminal data communication operation in the network system according to the first embodiment of the present invention.

  The network system 1 starts the inter-terminal data communication operation of FIG. 5 in response to a communication request operation at the communication terminal ES1. Here, a case where the communication terminal ES1 performs inter-terminal data communication such as a VoIP call with the communication terminal ES2 via the network NW2 will be described as an example.

First, the communication terminal ES1 transmits a communication request (CP1-NVITE) to the gateway device GW1 through the call control server CF1 based on the communication method CP1 by the access processing unit 14 (step 120).
In response to this communication request, the gateway device GW1 performs the hybrid peer-to-peer data communication a with the communication terminal ES1 by the access processing unit 24 based on the communication method CP1. As a result, a response (CP1-200 OK) and a response confirmation (CP1-ACK) are exchanged between the two, and the IP address of the gateway device GW1 is notified from the gateway device GW1 to the communication terminal ES1 via the call control server CF1. Is done.

Next, communication terminal ES1, gateway devices GW1 and GW2, and communication terminal ES2 exchange call control data for inter-terminal data communication (step 130A).
First, the communication terminal ES1 communicates with the gateway device GW1 through the peer-to-peer data communication b based on the communication method CP2 using the IP address of the gateway device GW1 acquired in step 120 by the communication control processing unit 15. A request (CP2-INVITE) is transmitted (step 131).

  In response to this communication request, the gateway device GW1 transfers a communication request (CP2-INVITE) to the gateway device GW2 by the call control processing unit 25 by the hybrid peer-to-peer data communication c based on the communication scheme CP2 (step 132). At this time, the call control processing unit 25 replaces the source address information (c = ES1 IP-ADR) included in the communication request with its own IP address (c = GW1 IP-ADR) (step 132A), Transfer communication request.

  The gateway device GW2 receives the communication request from the gateway device GW1 via the call control server CF2, and the access processing unit 24 makes a communication request to the communication terminal ES2 by hybrid peer-to-peer data communication d based on the communication method CP1. (CP1-INVITE) is transmitted (step 133).

The communication terminal ES2 performs hybrid peer-to-peer data communication d with the gateway device GW2 based on the communication method CP1 by the access processing unit 14, and transmits a response (CP1-200 OK) and a response confirmation (CP1) between the two. -ACK) in order.
Thereby, the IP address of the communication terminal ES2 is notified from the communication terminal ES2 to the gateway device GW2 via the call control server CF1.

Thereafter, the gateway device GW2 uses the IP address of the communication terminal ES2 acquired in Step 133 by the call control processing unit 25, and performs communication with the communication terminal ES2 by the peer-to-peer data communication e based on the communication method CP2. The communication request (CP2-INVITE) is transferred (step 134).
At this time, the call control processing unit 25 replaces the source address information (c = GW1 IP-ADR) included in the communication request with its own IP address (c = GW2 IP-ADR) (step 134A), Transfer communication request.

In response to this communication request, the communication terminal ES2 transmits a response (CP2-200 OK) to the gateway device GW2 by the communication control processing unit 15 by the peer-to-peer data communication e based on the communication scheme CP2 (step 140). ).
In response to this response, the gateway device GW2 transfers a response (CP2-200 OK) to the gateway device GW1 by the call control processing unit 25 through the hybrid peer-to-peer data communication c based on the communication method CP2 (step 141). ).
At this time, the call control processing unit 25 replaces the source address information (c = ES2 IP-ADR) included in the response with its own IP address (c = GW2 IP-ADR) (step 141A), and then the response Forward.

Similarly, the gateway device GW1 transfers a response (CP2-200 OK) to the communication terminal ES1 through the peer-to-peer data communication b based on the communication scheme CP2 by the call control processing unit 25 in response to this response. (Step 142).
At this time, the call control processing unit 25 replaces the source address information (c = GW2 IP-ADR) included in the response with its own IP address (c = GW1 IP-ADR) (step 142A), and then the response Forward.

The communication control processing unit 15 of the communication terminal ES1 transmits a response confirmation (CP2-ACK) to the gateway device GW1 through the data communication b in response to the response from the gateway device GW1 (step 143).
Similarly, the call control processing unit 25 of the gateway device GW1 transmits a response confirmation (CP2-ACK) from the communication terminal ES1 to the gateway device GW1 by the data communication c (step 144).
Similarly, the call control processing unit 25 of the gateway device GW2 transmits a response confirmation (CP2-ACK) from the gateway device GW2 to the communication terminal ES2 by the data communication e (step 145).

  In this way, based on the call control data for inter-terminal data communication exchanged between the communication terminal ES1, the gateway devices GW1 and GW2, and the communication terminal ES2, a data communication path is established between these devices ( Step 150). Here, since the communication terminal ES1 performs a VoIP call with the communication terminal ES2, RTP sessions are established as these data communication paths.

  At this time, since the transmission source address of the call control data is replaced in the gateway devices GW1 and GW2 in step 130A, the call control data for inter-terminal data communication is not between the communication terminals ES1 and ES2, but the communication terminal This is exchanged between ES1 and gateway device GW1, between gateway device GW1 and gateway device GW2, and between gateway device GW2 and communication terminal ES2. For this reason, peer-to-peer data communication paths p1, p2, and p3 are established between these devices.

That is, since the transmission source address of the response received in step 142 is the IP address of the gateway device GW1, the communication control processing unit 15 of the communication terminal ES1 cooperates with the call control processing unit 25 of the gateway device GW1. A peer-to-peer data communication path p1 is established via the network NW1 (step 151).
Further, the call control processing unit 25 of the gateway device GW1 cooperates with the call control processing unit 25 of the gateway device GW2 because the transmission source address of the response received in Step 141 is the IP address of the gateway device GW2. A peer-to-peer type data communication path p3 is established via the network NW2 (step 152).

Further, the call control processing unit 25 of the gateway device GW2 cooperates with the communication control processing unit 25 of the communication terminal ES2 in cooperation with the communication control processing unit 25 of the communication terminal ES2 because the source address of the response received in Step 140 is the IP address of the communication terminal ES2. A peer-to-peer data communication path p2 is established via the network NW1 (step 153).
As a result, the communication terminal ES1 and the communication terminal SE2 are connected via the peer-to-peer type data communication path p3 on the network NW2, and the data communication unit 16 between them starts the inter-terminal data communication, here, the VoIP call. The

Thereafter, in response to the end operation of the inter-terminal data communication at the communication terminal ES1, the communication control processing unit 15 of the communication terminal ES1 ends communication with the gateway device GW1 by data communication b based on the communication scheme CP2 (CP2- BYE).
The call control processing unit 25 of the gateway device GW1 transfers a communication end (CP2-BYE) to the gateway device GW1 by data communication c based on the communication method CP2.
Similarly, the call control processing unit 25 of the gateway device GW2 transfers a communication end (CP2-BYE) to the communication terminal ES2 by data communication d based on the communication method CP1.

In response, the communication control processing unit 25 of the communication terminal ES2 returns a response (CP2-200 OK), which is transferred to the communication terminal ES1 via the gateway device GW2 and the gateway device GW1 (step 160).
As a result, the peer-to-peer data communication paths p1, p2, and p3 are disconnected between the communication terminal ES1, the gateway device GW1, the gateway device GW2, and the communication terminal ES2, and the inter-terminal data communication ends.

Thereafter, the access processing unit 14 of the communication terminal ES1 sends a communication end (CP1-BYE) and a response (CP1-200 OK) to and from the gateway device GW1 by the hybrid peer-to-peer data communication a based on the communication method CP1. As a result, the hybrid peer-to-peer data communication a between the two ends (step 170).
Similarly, the access processing unit 14 of the communication terminal ES2 exchanges a communication end (CP1-BYE) and a response (CP1-200 OK) with the gateway device GW2 by hybrid peer-to-peer data communication d based on the communication method CP1. Thus, the hybrid peer-to-peer data communication d between the two ends (step 171).

In step 170, when the access processing unit 24 receives the communication end (CP1-BYE) from the communication terminal ES1, the gateway device GW1 ends the inter-terminal data communication of the communication terminal ES1 in the call control processing unit 25. Here, it is confirmed that the peer-to-peer data communication path p1 with the communication terminal ES1 is disconnected.
Here, when the inter-terminal data communication of the communication terminal ES1 is ended, the access processing unit 24 returns a response (CP1-200 OK), and ends the hybrid peer-to-peer data communication a between the two. If the inter-terminal data communication of the communication terminal ES1 is not completed, an error (CP1-4XX) is transmitted instead of a response (CP1-200 OK).
In step 171, the gateway device GW2 performs the same processing.

[Effect of the first embodiment]
As described above, in the present embodiment, when performing inter-terminal data communication between the communication terminals ES1 and ES2, peer-to-peer communication is performed between the communication terminal ES1 and the gateway device GW1 and between the communication terminal ES2 and the gateway device GW2. Type data communication.
For this reason, call control data used in the communication method CP2 of the network NW2 can easily pass through the network NW1, and the call control server CF1 of the network NW1 does not need to correspond to the communication method CP2 of the network NW2. . Therefore, the function service provided by the network NW2 from the network NW1 can be easily used in an ASP manner.

Thereby, for example, the network NW2 can provide an IM service using an extended SIP signal compliant with RFC3248.
At this time, the network NW1 is an SIP network that provides only the SIP basic call service compliant with RFC3261, and is between the communication terminal ES1 and the gateway device GW1 and between the communication terminal ES2 and the gateway device GW2. When connected via the network NW1 in an interworking manner, the extended SIP signal for IM service transmitted from the communication terminal ES1 passes through the call control server CF1 of the network NW1.

  Accordingly, when the call control server CF1 does not support the extended SIP signal, the extended SIP signal transmitted from the communication terminal ES1 is discarded by the call control server CF1 and is not transmitted to the gateway device GW1 side or the network NW2 side. There is. For this reason, the IM service of the network NW2 cannot be easily used in an ASP manner from the communication terminal ES1.

On the other hand, in the present embodiment, the extended SIP signal transmitted from the communication terminal ES1 is not discarded by the call control server CF1, but is transmitted through the call control server CF1 by peer-to-peer type data communication and transmitted to the gateway device GW1. To reach. Therefore, the function service provided from the network NW1 through the network NW2 can be easily used in an ASP manner.
Further, since the communication terminal and the gateway device are connected by peer-to-peer data communication, there is no overhead for encapsulation compared to the case where the capsule method is adopted for the purpose of passing the extended SIP signal. . As a result, an increase in data amount and processing load can be avoided, and the IM service can be used efficiently.

  Further, in the present embodiment, before starting the inter-terminal data communication, the hybrid peer-to-peer data communication a via the network NW1 is started between the communication terminal ES1 and the gateway device GW1, and the inter-terminal data At the end of communication, the gateway device GW1 ends the inter-terminal data communication in the communication terminal ES1, and then ends the hybrid peer-to-peer data communication a via the network NW1 with the communication terminal ES1.

  Therefore, the start and end of service use of the network NW2 can be confirmed by the hybrid peer-to-peer data communication a via the network NW1 with the communication terminal ES1, and even when using the service of the network NW2, user authentication, charging, It becomes possible to simultaneously use basic functions of the network NW1, such as session monitoring.

Specifically, for example, upon reception of the response (CP1-200 OK) in step 120 of FIG. 5, the call control server CF1 executes service processing such as user authentication, charging start, call log recording start, and the like in step 170. When receiving the response (CP1-200 OK), the call control server CF1 may execute service processing such as termination of billing and termination of call log recording. For these service processes, for example, a known technique such as RFC3261 authentication process or RFC4028 session monitoring process may be used.
For this reason, it is not necessary to provide the same function in both networks, and network resources can be used effectively.

In the present embodiment, when the call control data from the communication terminals ES1 and ES2 is transferred in the gateway devices GW1 and GW2, the source address included in the call control data is replaced with the own address and transferred. Therefore, it is possible to realize data communication between terminals via the network NW2.
As a result, as a function service provided in the network NW2, not only a function service related to call control but also a function service for communication data such as voice exchanged by data communication between terminals can be used from the network NW1. .

  In the present embodiment, the end of the data communication path A is confirmed after confirming the end of the inter-terminal data communication in response to the end request of the peer-to-peer type data communication path A between the communication terminal ES1 and the gateway device GW1. As a result, when the inter-terminal data communication has not ended, it is possible not to end the data communication path A. For this reason, it is possible to avoid an unauthorized attempt to end the data communication path A even though the terminal-to-terminal data communication is not ended, and to suppress an illegal act on the billing process and the call log recording process in the network NW1. It becomes possible.

  This can also be applied to the terminal registration processing operation of FIG. That is, in step 103, the end request (CP1-BYE) and the response (CP1-200 OK) may not be exchanged between the communication terminal ES1 and the gateway device GW1, and may be exchanged after step 105. Similarly, in step 104, the end request (CP1-BYE) and the response (CP1-200 OK) may not be exchanged between the communication terminal ES2 and the gateway device GW2, and may be exchanged after step 106.

  Note that step A described in the claims includes step 120 using hybrid peer-to-peer data communication a, step B includes steps 131, 142, and 143 using peer-to-peer data communication b, and step C Includes steps 132, 141, 144 using hybrid peer-to-peer data communication c, step D includes step 133 using hybrid peer-to-peer data communication d, and step E uses peer-to-peer data communication e. Steps 134, 140, and 145 are included, Step F includes Steps 151, 152, and 153 using peer-to-peer data communication paths p1, p2, and p3, and Step G is Step 170 using hybrid peer-to-peer data communication a. including.

[Second Embodiment]
Next, a network system according to the second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a sequence diagram showing an inter-terminal data communication operation in the network system according to the second embodiment of the present invention.

  In the first embodiment, when the call control data from the communication terminals ES1 and ES2 is transferred in the gateway devices GW1 and GW2, the source address included in the call control data is replaced with its own address and transferred. Thus, the case where data communication between terminals via the network NW2 is realized has been described as an example.

  In the present embodiment, when transferring the call control data from the communication terminals ES1 and ES2 in the gateway devices GW1 and GW2, the network NW1 is transferred by transferring the call control data without replacing the source address included in the call control data. A case where inter-terminal data communication via the terminal is realized will be described as an example.

  In the network system of the present embodiment, when the call control processing unit 25 of the gateway devices GW1 and GW2 transfers the call control data from the communication terminals ES1 and ES2, the source address included in the call control data is replaced. The first embodiment is different from the first embodiment in that the data is transferred without being transferred. Other configurations are the same as those in the first embodiment, and a detailed description thereof is omitted here.

  In step 132 of FIG. 6, the gateway device GW1 communicates with the gateway device GW2 by the call control processing unit 25 by the hybrid peer-to-peer data communication c based on the communication method CP2 in response to a communication request from the communication terminal ES1. Transfer the request (CP2-INVITE). At this time, the call control processing unit 25 transfers the communication request without performing replacement of the source address information (c = ES1 IP-ADR) included in the communication request (step 132B).

  Similarly, in step 134, the gateway device GW2 causes the call control processing unit 25 to make a communication request to the communication terminal ES2 by the peer-to-peer data communication d based on the communication method CP2 in response to the communication request from the gateway device GW1 ( CP2-INVITE). At this time, the call control processing unit 25 transfers the communication request without performing replacement of the source address information (c = ES1 IP-ADR) included in the communication request (step 134B).

  In step 141, the gateway device GW2 responds to the gateway device GW1 by the call control processing unit 25 through the hybrid peer-to-peer data communication c based on the communication method CP2 in response to the response from the communication terminal ES2. -200 OK). At this time, the call control processing unit 25 does not replace the source address information (c = ES2 IP-ADR) included in the response (step 141B) and transfers the response.

  Similarly, in step 142, the gateway device GW1 responds to the communication terminal ES1 by the call control processing unit 25 by the peer-to-peer data communication b based on the communication scheme CP2 in response to the response from the gateway device GW2 (CP2- 200 OK). At this time, the call control processing unit 25 transfers the response without replacing the source address information (c = ES2 IP-ADR) included in the response (step 142B).

Accordingly, in step 130B, the call control data is directly exchanged between the communication terminals ES1 and ES2, and the gateway devices GW1 and GW2 are not the transmission / reception source of the call control data.
For this reason, in step 150, the IP addresses of the communication terminals ES1 and ES2 are set as communication partners based on the call control data for inter-terminal data communication exchanged between the communication terminal ES1 and the communication terminal ES2. Since it is directly used as an address, a data communication path p4 via the network NW1 is established instead of the network NW2 (step 154). Here, since the communication terminal ES1 performs a VoIP call with the communication terminal ES2, RTP sessions are established as these data communication paths.

[Effect of the second embodiment]
As described above, in the present embodiment, when the call control processing unit 25 of the gateway devices GW1 and GW2 transfers the call control data from the communication terminals ES1 and ES2, the source address included in the call control data is replaced. Transfer without doing.
Therefore, under the control of the network NW2, it is possible to establish a data communication path via the network NW1, not the network NW2, as a communication path for inter-terminal data communication between the communication terminals ES1 and ES2.

FIG. 7 is a sequence diagram showing an inter-terminal data communication operation (call transfer service) in the network system according to the second embodiment of the present invention.
Here, a case will be described as an example where, when the communication terminal ES2 is performing a VoIP call with the communication terminal ES1, a call is transferred to the communication terminal ES3 in response to a call transfer request from the communication terminal ES2. Note that the network NW1 is a SIP network that provides only a SIP basic call service compliant with RFC3261, and the network NW2 is a SIP network that provides a call transfer service using the SIP extension rules. Assume.

  In step 154 of FIG. 7, after establishing a data communication path p4 via the network NW1 and starting a VoIP call, the network system 1 performs call transfer service processing in response to a call transfer request from the communication terminal ES2. Is started (step 150B).

  In this step 150B, a VoIP call between the communication terminals E1 and ES2 is transferred to the VoIP between the communication terminals E1 and ES3 using REFER, which is call control data specified by the SIP extension, provided by the communication method CP2 of the network NW2. The call is transferred as a call. For call transfer service processing, for example, a publicly known technology such as “Internet Initiation Protocol Service Examples draft-ietf-sipping-service-examples-15.txt” (IETF / SIPPING working group) Use it.

At this time, the VoIP call between the communication terminals E1 and ES2 and the VoIP call between the communication terminals E1 and ES3 are established not via the network NW2 but via the network NW1.
Therefore, according to the present embodiment, it is possible to use only the service function provided by the network NW2 without using the communication band of the network NW2.

Further, in the first and second embodiments, the gateway devices GW1 and GW2 are examples in which the case where the transmission source address in the call control data is replaced and the case where the transmission is not performed are fixedly performed. However, in the gateway devices GW1 and GW2, the necessity of address replacement may be changeable.
Specifically, according to the content of the inter-terminal data communication specified by the communication request from the communication terminal ES1, the communication load status of the gateway devices GW1 and GW2, and the operator's operation input to the gateway devices GW1 and GW2 The gateway devices GW1 and GW2 may determine whether or not address replacement is necessary.

[Third Embodiment]
Next, a network system according to the third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a sequence diagram showing an inter-terminal data communication operation in the network system according to the third embodiment of the present invention.

In the first embodiment, the case where inter-terminal data communication is performed using the peer-to-peer data communication path established via the networks NW1 and NW2 has been described as an example.
In the present embodiment, a case where connectionless inter-terminal data communication is performed without establishing a peer-to-peer data communication path will be described as an example.

  In the network system according to the present embodiment, the communication control processing unit 15 of the communication terminal ES1 does not use the call control data INVITE indicating the communication request for connection-type data communication but the connectionless communication request at the start of inter-terminal data communication. This is different from the first embodiment in that call control data MESSAGE indicating is transmitted. Other configurations are the same as those in the first embodiment, and a detailed description thereof is omitted here.

In the present embodiment, step 180 in FIG. 8 is executed instead of step 130A in FIG.
First, the communication terminal ES1 communicates with the gateway device GW1 through the peer-to-peer data communication b based on the communication method CP2 using the IP address of the gateway device GW1 acquired in step 120 by the communication control processing unit 15. A request (CP2-MESSAGE) is transmitted (step 131). In this communication request, “Hello ES2” is added in advance as a text message (step 131A).

  In response to this communication request, the gateway device GW1 transfers a communication request (CP2-MESSAGE) to the gateway device GW2 by the call control processing unit 25 by the hybrid peer-to-peer data communication c based on the communication scheme CP2 (step 182).

The gateway device GW2 receives the communication request from the gateway device GW1 via the call control server CF2, and establishes the hybrid peer-to-peer type data communication d based on the communication method CP1 with the communication terminal ES2 by the access processing unit 24. (Step 183).
Thereby, the IP address of the communication terminal ES2 is notified from the communication terminal ES2 to the gateway device GW2 via the call control server CF1.

  Thereafter, the gateway device GW2 uses the IP address of the communication terminal ES2 acquired in Step 183 by the call control processing unit 25 to perform communication with the communication terminal ES2 by peer-to-peer data communication d based on the communication method CP2. The communication request (CP2-MESSAGE) is transferred (step 184).

  The communication terminal ES 2 receives this communication request by the communication control processing unit 15, acquires the added character message “Hello ES 2”, and displays the screen on the user I / F unit 13. Thereafter, the communication control processing unit 15 transmits a response (CP2-200 OK) to the gateway device GW2 by the peer-to-peer data communication d based on the communication method CP2 (step 185).

  In response to this response, the gateway device GW2 transfers a response (CP2-200 OK) to the gateway device GW1 by the call control processing unit 25 through the hybrid peer-to-peer data communication c based on the communication method CP2 (step 186). ). At this time, the call control processing unit 25 transfers the communication request without replacing the transmission source address information included in the communication request.

  Similarly, the gateway device GW1 transfers a response (CP2-200 OK) to the communication terminal ES1 through the peer-to-peer data communication b based on the communication scheme CP2 by the call control processing unit 25 in response to this response. (Step 187). At this time, the call control processing unit 25 transfers the communication request without replacing the transmission source address information included in the communication request.

[Effect of the third embodiment]
Thus, in the present embodiment, the communication terminal ES1 and the gateway device GW1 and the communication terminal ES2 and the gateway device GW2 are connected by peer-to-peer data communication, and the gateway devices GW1 and GW2 are connected. In the call control processing unit 25, a communication request related to inter-terminal data communication is transferred from the communication terminal ES1 to the communication terminal ES2 via the network NW2 by connectionless data communication. At this time, the transmission is performed without replacing the transmission source address included in the call control data.

  At this time, if the call control server CF1 does not support the extended SIP signal, the communication request MESSAGE transmitted from the communication terminal ES1 is discarded by the call control server CF1 and is not transmitted to the gateway device GW1 side and further to the network NW2 side. . For this reason, the instant message service of the network NW2 cannot be easily used from the communication terminal ES1 in an ASP manner.

  In the present embodiment, the communication request MESSAGE transmitted from the communication terminal ES1 passes through the call control server CF1 by peer-to-peer data communication and reaches the gateway device GW1 without being discarded by the call control server CF1. For this reason, among functional services provided in the network NW2, services such as instant messages that do not require connection-type data communication can be easily used from the network NW1 in an ASP manner.

[Fourth Embodiment]
Next, a network system according to the fourth embodiment of the present invention will be described. FIG. 9 is a sequence diagram showing an inter-terminal data communication operation in the network system according to the fourth embodiment of the present invention.

In the first embodiment, a case has been described in which the hybrid peer-to-peer data communication a between the communication terminal ES1 and the gateway device GW1 is terminated after the inter-terminal data communication between the communication terminals ES1 and ES2 is terminated.
In the present embodiment, when the first communication terminal obtains the network address of the gateway device GW1 in the hybrid peer-to-peer data communication a and ends the data communication a before making a communication request for inter-terminal data communication. Will be described.

  In the network system according to the present embodiment, the timing for ending the hybrid peer-to-peer data communication a with the gateway device GW1 in the communication control processing unit 15 of the communication terminal ES1 is different from that in the first embodiment. Other configurations are the same as those in the first embodiment, and a detailed description thereof is omitted here.

In step 120 of FIG. 9, the communication control processing unit 15 of the communication terminal ES1 starts the hybrid peer-to-peer data communication a with the gateway device GW1, and acquires the network address of the gateway device GW1.
Thereafter, the communication control processing unit 15 of the communication terminal ES1 starts Step 170, and transmits a communication end (CP1-BYE) to the gateway device GW1 by the hybrid peer-to-peer data communication a based on the communication method CP1. .
In response to the end of the communication, the gateway device GW1 returns a response (CP1-200 OK) by the access processing unit 24, and the hybrid peer-to-peer data communication a between the two ends.

[Effect of the fourth embodiment]
Thus, in the present embodiment, after the first communication terminal acquires the network address of the gateway device GW1 in the hybrid peer-to-peer data communication a, and before making a communication request for inter-terminal data communication, the hybrid peer-to-peer The type data communication a is terminated.
Therefore, since the hybrid peer-to-peer data communication a is not continued during the inter-terminal data communication, it is possible to reduce the load on the call control server CF1 of the network NW1.

[Fifth Embodiment]
Next, with reference to FIGS. 10 and 11, a network system according to a fifth embodiment of the present invention will be described. FIG. 10 is a block diagram showing a configuration of a network system according to the fifth embodiment of the present invention. FIG. 11 is a sequence diagram showing an inter-terminal data communication operation in the network system according to the fifth embodiment of the present invention.

In the first embodiment, the case where the communication terminal ES1 connected to the network NW1 performs inter-terminal data communication with the communication terminal ES2 connected to the network NW1 has been described as an example.
In the present embodiment, a case will be described as an example where communication terminal ES1 performs inter-terminal data communication with communication terminal ES2 connected to network NW2.

  In the network system according to the present embodiment, since the communication terminal ES2 is connected to the network NW2, the gateway device GW2 is unnecessary, but the other configurations are the same as those in the first embodiment. The detailed description in is omitted.

  In step 130A of FIG. 11, the gateway device GW1 communicates with the communication terminal ES2 by the call control processing unit 25 by the hybrid peer-to-peer data communication d based on the communication method CP2 in response to a communication request from the communication terminal ES1. The request (CP2-INVITE) is transferred (step 132). At this time, the call control processing unit 25 replaces the source address information (c = ES1 IP-ADR) included in the communication request with its own IP address (c = GW1 IP-ADR) (step 132A), Transfer communication request.

In response to the communication request from the gateway device GW1, the communication terminal ES2 sends a response (CP2-200 OK) to the gateway device GW1 by the communication control processing unit 15 through the hybrid peer-to-peer data communication c based on the communication method CP2. Transmit (step 141).
In response to this response, the gateway device GW1 transfers a response (CP2-200 OK) to the communication terminal ES1 by the call control processing unit 25 by the peer-to-peer data communication b based on the communication scheme CP2 (step 142). . At this time, the call control processing unit 25 replaces the source address information (c = ES2 IP-ADR) included in the response with its own IP address (c = GW1 IP-ADR) (step 142A), and then the response Forward.

  In this way, based on the call control data for inter-terminal data communication exchanged between the communication terminal ES1, the gateway apparatus GW1, and the communication terminal ES2, a data communication path is established between these apparatuses (step 150). ). Here, since the communication terminal ES1 performs a VoIP call with the communication terminal ES2, RTP sessions are established as these data communication paths.

At this time, since the source address of the call control data is replaced in the gateway device GW1 in step 130A, the call control data for the inter-terminal data communication is not between the communication terminals ES1 and ES2, but with the communication terminal ES1. It is exchanged between the gateway device GW1 and the gateway device GW1 and the communication terminal ES2. Therefore, peer-to-peer data communication paths p1 and p2 are established between these devices.
As a result, the communication terminal ES1 and the communication terminal SE2 are connected via the data communication paths p1 and p2, and the data communication between terminals, that is, the VoIP call in this case, is started by the data communication units 16 of both.

Thereafter, in response to the end operation of the inter-terminal data communication at the communication terminal ES1, the communication control processing unit 15 of the communication terminal ES1 ends communication with the gateway device GW1 by data communication b based on the communication scheme CP2 (CP2- BYE).
The call control processing unit 25 of the gateway device GW1 transfers a communication end (CP2-BYE) to the communication terminal ES2 by data communication d based on the communication method CP2.

In response, the communication control processing unit 25 of the communication terminal ES2 returns a response (CP2-200 OK), which is transferred to the communication terminal ES1 via the gateway device GW1 (step 160).
As a result, the peer-to-peer data communication paths p1 and p2 are disconnected between the communication terminal ES1, the gateway device GW1, and the communication terminal ES2, and the inter-terminal data communication ends.

[Effect of Fifth Embodiment]
Thus, in this embodiment, when the communication terminal ES2 is connected to the network NW2, the gateway device GW2 in the first embodiment is omitted, and the communication function with the communication terminal ES2 of the gateway device GW2 is omitted. Is realized by the gateway device GW1.
Therefore, as in the first embodiment, in this embodiment, when performing inter-terminal data communication between the communication terminals ES1 and ES2, peer-to-peer data communication is performed between the communication terminal ES1 and the gateway device GW1. Connected with.

  For this reason, call control data used in the communication method CP2 of the network NW2 can easily pass through the network NW1, and the call control server CF1 of the network NW1 does not need to correspond to the communication method CP2 of the network NW2. . Therefore, the function service provided by the network NW2 from the network NW1 can be easily used in an ASP manner.

Further, the present embodiment can be applied not only to the first embodiment but also to the second to fourth embodiments described above.
FIG. 12 is a sequence diagram showing an inter-terminal data communication operation when the fifth embodiment is applied to the second embodiment (see FIG. 6).
FIG. 13 is a sequence diagram showing an inter-terminal data communication operation (call transfer service) when the fifth embodiment is applied to the second embodiment (see FIG. 7).
FIG. 14 is a sequence diagram showing an inter-terminal data communication operation when the fifth embodiment is applied to the third embodiment (see FIG. 8).
FIG. 15 is a sequence diagram showing an inter-terminal data communication operation when the fifth embodiment is applied to the fourth embodiment (see FIG. 9).

These configurations and operations are the same as those in the second to fourth embodiments described above, and a detailed description thereof is omitted here.
When applied to any of the second to fourth embodiments, the same effects as those of the above-described embodiments can be obtained.

[Extended embodiment]
In each of the above embodiments, the case where the networks NW1 and NW2 are SIP networks has been described as an example. However, the present invention is not limited to this, and the same applies to a network that provides services other than SIP. Thus, each embodiment can be applied, and similar effects can be obtained.

It is a block diagram which shows the structure of the network system concerning the 1st Embodiment of this invention. It is a block diagram which shows the structure of the communication terminal used with the network system concerning the 1st Embodiment of this invention. It is a block diagram which shows the structure of the gateway apparatus used with the network system concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the terminal registration processing operation | movement in the network system concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the data communication operation | movement between terminals in the network system concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the data communication operation | movement between terminals in the network system concerning the 2nd Embodiment of this invention. It is a sequence diagram which shows the data communication operation | movement (call transfer service) between terminals in the network system concerning the 2nd Embodiment of this invention. It is a sequence diagram which shows the data communication operation | movement between terminals in the network system concerning the 3rd Embodiment of this invention. It is a sequence diagram which shows the data communication operation | movement between terminals in the network system concerning the 4th Embodiment of this invention. It is a block diagram which shows the structure of the network system concerning the 5th Embodiment of this invention. It is a sequence diagram which shows the data communication operation | movement between terminals in the network system concerning the 5th Embodiment of this invention. It is a sequence diagram which shows the data communication operation | movement between terminals in case the 5th Embodiment is applied to 2nd Embodiment (refer FIG. 6). It is a sequence diagram which shows the data communication operation | movement (call transfer service) between terminals at the time of applying 5th Embodiment to 2nd Embodiment (refer FIG. 7). It is a sequence diagram which shows the data communication operation | movement between terminals in case the 5th Embodiment is applied to 3rd Embodiment (refer FIG. 8). It is a sequence diagram which shows the data communication operation | movement between terminals in case the 5th Embodiment is applied to 4th Embodiment (refer FIG. 9).

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Network system, ES1, ES2 ... Communication terminal, 11 ... Communication I / F part, 12 ... Memory | storage part, 13 ... User I / F part, 14 ... Access processing part, 15 ... Communication control processing part, 16 ... Data communication Unit, GW1, GW2 ... gateway device, 21 ... communication I / F unit, 22 ... storage unit, 23 ... user I / F unit, 24 ... access processing unit, 25 ... call control processing unit, 26 ... relay processing unit, NW1 , NW2 ... network, CF1, CF2 ... call control server.

Claims (17)

A first network that provides a data communication service based on the first communication method; a second network that provides a data communication service based on a second communication method different from the first communication method; and And a first communication terminal connected to the first network via the network system and a second gateway device interconnecting the first and second networks respectively. A communication control method for performing inter-terminal data communication between the communication terminals,
Step A in which the first communication terminal starts hybrid peer-to-peer type first data communication with the first gateway device via the first network based on the first communication method. When,
The first communication terminal uses the network address of the first gateway device acquired in the first data communication to call-control data related to the inter-terminal data communication based on the second communication method. Step B for exchanging with the first gateway device via peer-to-peer data communication via the first network;
The first gateway device transmits call control data related to the inter-terminal data communication between the second communication terminal and the second gateway device corresponding to the second communication device based on the second communication method. Step C for exchanging by hybrid peer-to-peer data communication via the network of 2;
Step D in which the second gateway device performs hybrid peer-to-peer type second data communication with the second communication terminal via the first network based on the first communication method. When,
The second gateway device uses the network address of the second communication terminal acquired in the second data communication to call control data related to the inter-terminal data communication based on the second communication method. Exchanging with the second communication terminal by peer-to-peer type data communication via the first network; and
A step F in which the first communication terminal performs the inter-terminal data communication based on the call control data exchanged with the second communication terminal via the first and second gateway devices; ,
The first gateway device includes a step G of ending the first data communication with the first communication terminal after the end of the data communication between the terminals at the first communication terminal. A communication control method characterized by the above. The communication control method according to claim 1,
In the step B, after the first gateway device replaces the source address included in the call control data from the second gateway device with its own network address, the call control data is transferred to the first communication device. Including transferring to the terminal,
In the step C, after the first gateway device replaces the source address included in the call control data from the first communication terminal with its own network address, the call control data is transferred to the second gateway. Transferring to the device, and after the second gateway device replaces the source address included in the call control data from the second communication terminal with its own network address, the call control data is transferred to the first gateway device. Transferring to a gateway device of
In the step E, after the second gateway device replaces the source address included in the call control data from the first gateway device with its own network address, the call control data is transferred to the second communication device. Including transferring to the terminal,
Step F includes
Based on the call control data exchanged between the first communication terminal and the first gateway device, a peer-to-peer type first communication is performed with the first gateway device via the first network. Establishing a data communication path;
Based on the call control data exchanged between the second gateway device and the first gateway device and the second communication terminal, the second gateway device communicates with the second communication terminal via the first network. Establishing a peer-to-peer type second data communication path;
Based on the call control data exchanged with the first communication terminal and the second gateway device, the first gateway device communicates with the second gateway device via the second network. Establishing a peer-to-peer third data communication path;
The first communication terminal performing the inter-terminal data communication with the second communication terminal via the first, second, and third data communication paths. Communication control method. The communication control method according to claim 1,
Step F includes
Based on the call control data exchanged between the first communication terminal and the second communication terminal via the first and second gateway devices, the first communication terminal via the first network Establishing a peer-to-peer data communication path with a second communication terminal;
The first communication terminal performs the inter-terminal data communication with the second communication terminal via the data communication path. The communication control method according to claim 1,
Instead of the step G, the first communication terminal acquires the network address of the first gateway device in the first data communication in the step A and then proceeds to the step B before moving to the step B. A communication control method comprising the step of terminating one data communication. The communication control method according to claim 1,
In step B, step C, and step E, each data communication is a connectionless data communication,
In the step F, the first communication terminal communicates with the second communication terminal using the user data added to the call control data exchanged in the connectionless type data communication. A communication control method comprising a step of performing data communication. In the communication control method according to claim 2 or 3,
In the step G, when the first gateway device receives the end request for the first data communication before the end request for the inter-terminal data communication from the first communication terminal, the first data A communication control method comprising a step of rejecting a communication end request. A first network that provides a data communication service based on the first communication method; a second network that provides a data communication service based on a second communication method different from the first communication method; and A network system including a gateway device interconnecting each of the first and second networks, and connected to the first communication terminal connected to the first network and the second network via the network system. A communication control method for performing inter-terminal data communication with a second communication terminal,
Step A in which the first communication terminal starts hybrid peer-to-peer type first data communication with the gateway device via the first network based on the first communication method;
Based on the second communication method, the first communication terminal uses the network address of the gateway device acquired in the first data communication to transmit call control data related to the inter-terminal data communication to the gateway. Step B for exchanging with a device by peer-to-peer data communication via the first network;
Based on the second communication method, the gateway device transmits call control data related to the inter-terminal data communication to and from the second communication terminal in a hybrid peer-to-peer type via the second network. Step C for exchanging by data communication of 2;
Step F for performing data communication between terminals based on the call control data exchanged between the first communication terminal and the second communication terminal via the gateway device;
The gateway device comprises a step G of ending the first data communication with the first communication terminal after the end of the data communication between the terminals at the first communication terminal. Communication control method. A first network that provides a data communication service based on the first communication method; a second network that provides a data communication service based on a second communication method different from the first communication method; and Inter-terminal data between a first communication terminal and a second communication terminal connected to the first network, the first and second gateway devices interconnecting the first and second networks respectively. A network system for communication,
The first communication terminal performs first data communication of a hybrid peer-to-peer type with the first gateway device via the first network based on the first communication method. And using the network address of the first gateway device acquired in the first data communication, the call control data relating to the inter-terminal data communication is transferred to the first gateway based on the second communication method. A communication control processing unit that exchanges data with a device through peer-to-peer data communication via the first network,
The first gateway device performs hybrid peer-to-peer type first data communication with the first communication terminal via the first network based on the first communication method. An access processing unit for ending the first data communication after confirming the end of the inter-terminal data communication at the first communication terminal at the end of the inter-terminal data communication; and the second communication method. The call control data related to the inter-terminal data communication is exchanged with the first communication terminal by the peer-to-peer type data communication via the first network, and the inter-terminal data communication Call control data is transmitted between the second communication terminal and the corresponding second gateway device via hybrid peer-to-peer via the second network. And a call control processor for exchanging the data communication,
The second gateway device performs hybrid peer-to-peer type second data communication with the second communication terminal via the first network based on the first communication method. And using the network address of the second communication terminal acquired in the second data communication, the call control data related to the inter-terminal data communication based on the second communication method, A call control processing unit for exchanging with a communication terminal by peer-to-peer data communication via the first network;
The second communication terminal performs a hybrid peer-to-peer type second data communication with the second gateway device via the first network based on the first communication method. And, based on the second communication method, call control data related to the inter-terminal data communication is exchanged with the second gateway device by peer-to-peer data communication via the first network. And a communication control processing unit. The network system according to claim 8, wherein
The call control processing unit of the first communication terminal performs peer-to-peer communication with the first gateway device via the first network based on the call control data exchanged with the first gateway device. Establish a first data communication path of the mold,
The call control processing unit of the first gateway device replaces a source address included in call control data from the first communication terminal or the second gateway device with its own network address, and then performs the call control. Based on the call control data transferred to the second gateway device or the first communication terminal facing the data and exchanged with the first communication terminal and the second gateway device, the first A peer-to-peer type first data communication path is established with the first communication terminal via the network, and peer-to-peer is established with the second gateway device via the second network. Establish a third data communication path of the type,
The call control processing unit of the second gateway device replaces the source address included in the call control data from the first gateway device or the second communication terminal with its own network address, and then performs the call control. Based on the call control data transferred to the second communication terminal or the first gateway device facing the data and exchanged with the first gateway device and the second communication terminal, the first A peer-to-peer type second data communication path is established with the second communication terminal via the network, and a peer-to-peer type is established with the second gateway device via the second network. Establishing the third data communication path of
The call control processing unit of the second communication terminal communicates with the second gateway device via the first network based on the call control data exchanged with the second gateway device. Establishing said second data communication path of type
The first communication terminal further includes a data communication unit that performs inter-terminal data communication with the second communication terminal via the first, second, and third data communication paths. A network system characterized by The network system according to claim 8, wherein
The communication control processing unit of the first communication terminal is configured to perform the first control based on the call control data exchanged with the second communication terminal via the first and second gateway devices. Establishing a peer-to-peer fourth data communication path with the second communication terminal via the network;
The network system, wherein the first communication terminal further includes a data communication unit that performs data communication between the terminals with the second communication terminal via the fourth data communication path. The network system according to claim 8, wherein
The access processing unit of the first communication terminal acquires the network address of the first gateway device through the first data communication, and then performs data communication with the first gateway device by the communication control processing unit. A network system, wherein the first data communication is terminated before starting. The network system according to claim 8, wherein
The peer-to-peer data communication between the first communication terminal and the first gateway device, the hybrid peer-to-peer data communication between the first and second gateway devices, and the second gateway device and the The peer-to-peer type data communication with the second communication terminal, each data communication is a connectionless type data communication,
The communication control processing units of the first and second communication terminals perform the inter-terminal data communication between the two using user data added to the call control data exchanged by the connectionless data communication. A network system characterized by this. In the network system according to claim 9 or 10,
When the access processing unit of the first gateway apparatus receives the end request for the first data communication before the end request for the inter-terminal data communication from the first communication terminal, the first data communication A network system characterized by rejecting a request for termination of the network. A first network that provides a data communication service based on the first communication method; a second network that provides a data communication service based on a second communication method different from the first communication method; and A first communication terminal connected to the first network and a second communication terminal connected to the second network, the gateway device interconnecting the first network and the second network respectively. A network system for performing data communication between terminals,
The first communication terminal, based on the first communication method, an access processing unit that performs hybrid peer-to-peer type first data communication with the gateway device via the first network; Based on the second communication method, using the network address of the gateway device acquired in the first data communication, call control data related to the inter-terminal data communication is transmitted to the gateway device. A communication control processing unit for exchanging by peer-to-peer data communication via the network of 1,
The gateway device performs hybrid peer-to-peer type first data communication with the first communication terminal via the first network based on the first communication method, and the terminal. At the end of the inter-data communication, after confirming the end of the inter-terminal data communication at the first communication terminal, based on the second communication method and the access processing unit that ends the first data communication The call control data relating to the inter-terminal data communication is exchanged with the first communication terminal by the peer-to-peer type data communication via the first network, and the call control data relating to the inter-terminal data communication. Control for exchanging data with the second communication terminal by hybrid peer-to-peer data communication via the second network And a processing section,
Based on the second communication method, the second communication terminal transmits call control data related to the inter-terminal data communication to the gateway device through hybrid peer-to-peer type data via the second network. A network system comprising a communication control processing unit that communicates by communication. A first network that provides a data communication service based on a first communication method; a second network that provides a data communication service based on a second communication method different from the first communication method; and A network that performs inter-terminal data communication between a first communication terminal and a second communication terminal connected to the first network, the network including one and at least one gateway device that connects the first network and the second network A gateway device used in the system,
An access processing unit for notifying an address of the gateway device for accessing the second network by establishing first communication by the first communication method with the first communication terminal; ,
A communication request using the address according to the second communication method is received from the first communication terminal, and between the first communication terminal and the second communication terminal based on the communication request A gateway apparatus comprising: a call control processing unit configured to perform communication necessary for performing data communication via the second network. A first network that provides a data communication service based on the first communication method; a second network that provides a data communication service based on a second communication method different from the first communication method; and And a plurality of gateway devices interconnecting the first and second networks, respectively, and a communication terminal used in a network system for performing inter-terminal data communication with other communication terminals connected to the first network Because
Based on the first communication method, a hybrid peer-to-peer type first data communication is performed with the gateway device via the first network, and at the end of the inter-terminal data communication, the terminal An access processing unit for ending the first data communication after ending the inter-data communication;
Based on the second communication method, using the network address of the gateway device acquired in the first data communication, call control data related to the inter-terminal data communication is transmitted to the gateway device. A communication terminal comprising: a communication control processing unit that exchanges by peer-to-peer type data communication via one network. A first network that provides a data communication service based on a first communication method; a second network that provides a data communication service based on a second communication method different from the first communication method; and And a communication terminal used in a network system that performs inter-terminal data communication with another communication terminal connected to the first network. Because
An access processing unit for acquiring an address of the gateway device for accessing the second network by establishing first communication by the first communication method with the gateway device ;
By transmitting a communication request based on the second communication method to the gateway device using the address acquired in the first communication, the second request is sent via the gateway device and the second network. A communication terminal comprising: a communication control processing unit that requests start of data communication with the communication terminal.

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