JP2010268356A - Gateway apparatus, relay method, relay program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the loads of user who configures settings for a gateway apparatus and a VoIP terminal apparatus to which a data communication network and an IP telephone network are connected. <P>SOLUTION: Information on the VoIP terminal apparatus 20 for communicating with the IP telephone network 100 is registered in the VoIP terminal apparatus setting information. Information on the IP telephone network 100 is registered in the DHCP setting information. A transfer setting part 113 generates packet transfer setting information in which a packet transfer rule is determined from the VoIP terminal apparatus setting information and the DHCP setting information. A generation part 132 generates SIP information from the gateway apparatus internal setting information and DHCP setting information, and notifies the VoIP terminal apparatus 20 of the generated SIP information. Consequently, the gateway apparatus 10 and the VoIP terminal apparatus 20 can be set without troubling a user. Further, when registering the VoIP terminal apparatus 20 communicating with the IP telephone network 100 in the VoIP terminal apparatus setting information, the user can simultaneously use the VoIP service and the Internet. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technology for connecting a terminal and a network, and more particularly to a gateway device, a relay method, a relay program, and a recording medium used for a VoIP service using SIP.

  VoIP (Voice over Internet Protocol) services using SIP (Session Initiation Protocol) are provided by ISPs (Internet Service Providers) and communication carriers. In using the VoIP service, a device having a function of interpreting SIP and converting a call packet into a voice signal (hereinafter referred to as “VoIP termination device”) is required.

  When a user uses an Internet service or a VoIP service, a gateway device such as a CPE (Customer Premises Equipment) that relays a communication network with a terminal in the home is used (see, for example, Patent Document 1). The gateway device has an interface for connecting to a WAN (Wide Area Network) and a LAN (Local Area Network), and relays WAN side communication With a terminal connected to the LAN side. When the VoIP service is used, if the VoIP terminator is not built in the gateway device, the user separately connects the VoIP terminator under the gateway device. The VoIP terminator is connected to the LAN side of the gateway device, and is normally assigned a local IP (Internet Protocol) address of the LAN side segment. The SIP message and the call packet transmitted / received by the VoIP terminator are relayed and transferred by the gateway device.

  When using the VoIP service with the above configuration, the following two settings need to be made. First, in order for the gateway device to transfer packets transmitted and received by the VoIP terminator, it is necessary to appropriately set the network address translation function (NAT), firewall, and routing of the gateway device. Second, in order to generate a SIP message, the VoIP terminator needs to know the global IP address assigned to the WAN side interface of the gateway device.

  In order to perform the above setting, there is a UPnP NAT Traversal using a gateway device corresponding to UPnP (Universal Plug and Play) and a VoIP terminator as a prior art. The VoIP terminal device can acquire the global IP address of the gateway device through UPnP and perform NAT setting. UPnP NAT Traversal is used not only for VoIP termination devices but also for applications on non-VoIP terminals connected to the LAN side of the gateway device. An example of an application is an instant messenger that exchanges messages with another person's terminal via a WAN.

  By the way, some VoIP services use an IP telephone network constructed separately from a data communication network for using services on the Internet via an ISP (for example, see Non-Patent Document 1). ). Since the IP telephone network is a different subnet from the data communication network, an IP address for communicating with each of the data communication network and the IP telephone network is assigned to the WAN side interface of the gateway device.

Japanese Patent No. 4091619

"Interface for Voice IP Communication Network Service (Type 2 Service Type 1 Menu 1)", [online], March 31, 2008, Nippon Telegraph and Telephone West Corporation, [Search April 20, 2009], Internet <URL: http://flets-w.com/hikaridenwa/download/hikari_tel5.0.pdf>

  When the VoIP service provided by the ISP is used, the network to which the gateway device is connected is only the data communication network, and the global IP address acquired by UPnP by the VoIP terminal device and the non-VoIP terminal may be the same. However, when the IP telephone network and the data communication network are connected to the gateway device, and both the VoIP terminal device using the IP telephone network and the non-VoIP terminal using the data communication network use UPnP, the gateway device is connected. It becomes necessary to notify a global IP address corresponding to the type of terminal.

  However, UPnP does not define a method for identifying a connected terminal and notifying an IP address corresponding to the terminal. When the IP telephone network and the data communication network are different, there arises a problem that either the VoIP terminal device or the non-VoIP terminal cannot use UPnP NAT Traversal.

  If the VoIP terminator does not use UPnP NAT Traversal, the user can manually set the IP address, NAT, etc. in the gateway device and the VoIP terminator, but the VoIP service can be used. This leads to a burden. Also, whenever the IP phone network side equipment construction or user contract change causes the IP address or contract telephone number assigned to the gateway device to change, the user must manually change the settings of the gateway device and VoIP termination device. This is also a burden on the user.

  The present invention has been made in view of the above, and an object of the present invention is to reduce the burden of user setting on a gateway device and a VoIP terminator to which a data communication network and an IP telephone network are connected. .

  A gateway device according to a first aspect of the present invention is a gateway device that connects a data communication network and an IP telephone network to a WAN side, and relates to terminal setting information and information related to a terminal that communicates with the IP telephone network and the IP telephone network Storage means for storing network side information registered information, terminal setting information and network side information are read from the storage means, and packets are relayed between the terminal registered in the terminal setting information and the IP telephone network, and the terminal Transfer setting means for generating transfer information to be set so as to relay packets between the terminal not registered in the setting information and the data communication network and storing it in the storage means, and connecting to the LAN side with reference to the transfer information Transfer means for relaying packets between the terminal and the data communication network or IP telephone network, and the IP telephone information required for communication with the IP telephone network from the terminal Determining whether or not the terminal is registered in the terminal setting information, and if the terminal is registered in the terminal setting information, a notification means for notifying IP telephone information to be set in the terminal; It is characterized by having.

  When the gateway apparatus receives a network side information reacquisition request from the IP telephone network, it updates the network side information and requests the terminal registered in the terminal setting information to update the setting of the terminal. It has an update means, It is characterized by the above-mentioned.

  A relay method according to a second aspect of the present invention is a gateway device relay method for connecting a data communication network and an IP telephone network to the WAN side, and includes terminal setting information in which information related to a terminal communicating with the IP telephone network is registered, and IP The terminal setting information and the network side information are read from the storage means for storing the network side information in which the information related to the telephone network is registered, the packet is relayed between the terminal registered in the terminal setting information and the IP telephone network, and the terminal setting A step of generating transfer information set to relay packets between a terminal not registered in the information and the data communication network and storing it in the storage means; and a terminal connected to the LAN side with reference to the transfer information Relaying a packet between the terminal and the data communication network or the IP telephone network, and when the terminal requests IP telephone information necessary for communication with the IP telephone network, Determining whether the terminal is registered in the terminal setting information, and if the terminal is registered in the terminal setting information, the step of notifying IP telephone information to be set in the terminal is included. .

  In the relay method, when a re-acquisition request for network-side information is received from the IP telephone network, the network-side information is updated and a terminal registered in the terminal setting information is requested to update the setting of the terminal. It has a step.

  A relay program according to a third aspect of the present invention causes a computer to function as each means constituting the gateway device.

  A recording medium according to a fourth aspect of the present invention records a relay program for causing a computer to function as each means constituting the gateway device.

  ADVANTAGE OF THE INVENTION According to this invention, the burden of the user setting to the gateway apparatus and VoIP termination | terminus apparatus with which a data communication network and an IP telephone network are connected can be eased.

It is a block diagram which shows the structure and utilization environment of the gateway apparatus in this Embodiment. It is a figure which shows the structural example of VoIP termination | terminus apparatus setting information. It is a figure which shows the structural example of gateway apparatus internal setting information. It is a figure which shows the structural example of DHCP setting information. It is a flowchart which shows the flow of a process of the said gateway apparatus. It is a sequence diagram which shows the flow of the process in which the said gateway apparatus acquires DHCP setting information. It is a sequence diagram which shows the flow of the process in which the said gateway apparatus pays out an IP address to a VoIP termination | terminus apparatus. It is a figure which shows a mode that DHCP information is produced | generated. It is a sequence diagram which shows the flow of the process in which the said gateway apparatus notifies SIP information to a VoIP termination | terminus apparatus. It is a figure which shows the example of a SIP information request message. It is a figure which shows a mode that SIP information is produced | generated. It is a figure which shows the example of a SIP information response message. It is a flowchart which shows the flow of the process which updates the setting information of a gateway apparatus and a VoIP termination | terminus apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration and usage environment of a gateway device according to the present embodiment. The WAN side of the gateway device 10 shown in the figure is connected to the IP telephone network 100 and the data communication network 200, and the VoIP terminator 20 and the non-VoIP terminal 30 are connected to the LAN side. In the IP telephone network 100, a DHCP server 110 and a SIP server 120 are arranged.

  The gateway device 10 includes a DHCP client unit 11, a DHCP server unit 12, a SIP information notification unit 13, a packet transfer unit 14, and a setting storage unit 15. The gateway device 10 may be configured by a computer including an arithmetic processing device, a storage device, a memory, and the like, and the processing of each unit may be executed by a program. This program is stored in a storage device included in the gateway device 10, and can be recorded on a recording medium such as a magnetic disk, an optical disk, or a semiconductor memory, or provided through a network. Hereinafter, an outline of processing of each unit will be described.

  The DHCP client unit 11 creates a protocol processing unit 111 that performs processing according to DHCP (Dynamic Host Configuration Protocol), an extraction unit 112 that extracts DHCP setting information from a DHCP message transmitted by the DHCP server 110, and packet transfer setting information. A transfer setting unit 113 for setting is provided.

  The DHCP server unit 12 includes a protocol processing unit 121 that performs processing according to DHCP, a determination unit 122 that determines whether or not the transmission source of the DHCP message is the VoIP terminal device 20, and a generation that generates a DHCP message according to the transmission source Part 123 is provided. Whether or not the transmission source of the DHCP message is the VoIP termination device 20 is determined by whether or not the transmission source terminal is registered in VoIP termination device setting information described later.

  The SIP information notification unit 13 receives the SIP information request message transmitted from the VoIP terminal device 20, receives the SIP information response message to the VoIP terminal device 20, and the generation unit 132 that generates the SIP information response message. Is provided. The SIP information response message is generated and transmitted when the transmission source of the SIP information request message is registered in VoIP termination device setting information described later.

  The packet transfer unit 14 includes an address conversion unit 141 that converts a local IP address and a global IP address to each other, a filtering unit 142 that controls packet passage, and a routing unit 143 that determines a transfer destination of the packet. The packet transfer unit 14 transfers a packet based on packet transfer setting information stored in a setting storage unit 15 described later.

  The setting storage unit 15 stores VoIP terminating device setting information, gateway device internal setting information, DHCP setting information, SIP information, and packet transfer setting information. Hereinafter, various information stored in each setting storage unit 15 will be described.

  FIG. 2 is a diagram illustrating a configuration example of VoIP termination device setting information. The VoIP terminator setting information holds the MAC address of the VoIP terminator 20 and the IP address set in the VoIP terminator 20. In addition, an identification flag for distinguishing between the VoIP terminal device 20 and other terminals that issue fixed IP addresses may be held. The VoIP terminal device setting information stored in the setting storage unit 15 is registered by the user using the setting terminal 40. By determining whether or not it is registered in the VoIP termination device setting information, it is possible to identify whether it is a VoIP termination device 20 or a non-VoIP terminal 30.

  FIG. 3 is a diagram illustrating a configuration example of gateway device internal setting information. The gateway device internal setting information holds the MAC address of the gateway device 10, the LAN side IP address of the gateway device 10, and the subnet mask of the LAN side segment.

  FIG. 4 is a diagram illustrating a configuration example of DHCP setting information. The DHCP setting information holds an IP address for communicating with the IP telephone network 100, a subnet mask, a router address, an address of the SIP server 120 for using the VoIP service, a telephone number, and a SIP domain name. In addition, the address of the DHCP server 110, a lease time for making another inquiry to the DHCP server 110, and the like may be held. The DHCP setting information is set based on the information acquired from the DHCP server 110.

  In the packet transfer setting information (not shown), various information of NAT / NAPT, filtering, and routing used in the packet transfer process is set. The packet transfer setting information is set so as to relay a packet between the VoIP terminal device 20 and the IP telephone network 100 and relay a packet between the non-VoIP terminal 30 and the data communication network 200. The packet transfer setting information is created by the transfer setting unit 113 from the VoIP terminator setting information and the DHCP setting information.

  Next, the operation of the gateway device in the present embodiment will be described. It is assumed that the user setting corresponding to the MAC address of the gateway device 10 is registered in advance in the DHCP server 110 of the IP telephone network 100, and the MAC address of the VoIP termination device 20 used in the VoIP service, the VoIP termination device. It is assumed that the IP address set to 20 is registered in the VoIP terminator setting information in the setting storage unit 15.

  FIG. 5 is a flowchart showing the flow of processing of the gateway device in the present embodiment.

  First, the DHCP client unit 11 acquires information including an IP address for connecting to the IP telephone network 100 from the DHCP server 110 of the IP telephone network 100, and stores the information in the setting storage unit 15 as DHCP setting information (step S11). ). The DHCP sequence at this time will be described later.

  Subsequently, the transfer setting unit 113 of the DHCP client unit 11 sets packet transfer for using the VoIP service (step S12). The transfer setting unit 113 reads the VoIP terminal device setting information and the DHCP setting information from the setting storage unit 15, generates settings for packet transfer between the VoIP terminal device 20 and the IP telephone network 100, and sends the packet to the setting storage unit 15. Set as setting information. Specifically, for NAT, setting is made so that NAT is permitted for all port numbers and all protocols between the WAN side IP address of the gateway device 10 connected to the IP telephone network 100 and the IP address of the VoIP terminator 20. To do. With respect to filtering, while allowing all packets to pass between the VoIP terminator 20 and the IP telephone network 100, passing all packets between a terminal other than the VoIP terminator 20 and the IP telephone network 100 is permitted. Set to reject. For routing, the packet sent from the VoIP terminal device 20 is set to be transferred to the IP telephone network 100, and the packet received from the IP telephone network 100 is set to be transferred to the VoIP terminal device 20. At this time, various settings for VoIP transfer are set higher in priority than user settings. As a result, even when the user mistakenly sets to block packets related to VoIP, a call using VoIP is guaranteed.

  Subsequently, when the VoIP terminator 20 is connected to the gateway device 10, the VoIP terminator 20 tries to obtain an IP address from the gateway device 10 by DHCP, so that the DHCP server unit 12 requests the VoIP terminator 20. Accordingly, DHCP setting information is generated and notified (step S13). The generation of the DHCP sequence and DHCP setting information at this time will be described later.

  Subsequently, when the VoIP termination device 20 requests SIP information from the gateway device 10, the SIP information notification unit 13 generates and notifies the SIP information in response to the request from the VoIP termination device 20 (step S14). The generation and notification of SIP information will be described later.

  Thereafter, the packet transfer unit 14 transfers a packet between the VoIP terminal device 20 and the IP telephone network 100 based on the packet transfer setting information set in step S12 (step S15). As a result, the VoIP termination device 20 can use the VoIP service. Although not described, the packet transfer unit 14 also performs a packet transfer process between the non-VoIP terminal and the data communication network 200. Note that the registration to the REGISTER server, the transmission / reception of SIP messages, and the transmission / reception of call packets are performed by the VoIP terminal device 20, and thus description thereof is omitted here.

  Next, the process of step S11 in which the gateway device 10 acquires DHCP setting information will be described.

  FIG. 6 is a sequence diagram showing a flow of processing in which the gateway apparatus 10 acquires DHCP setting information.

  First, the protocol processing unit 111 of the DHCP client unit 11 sets the MAC address held in the gateway device internal setting information in the DHCP DISCOVER message and sends it (step S21).

  The DHCP server 110 that has received the DHCP DISCOVER message generates information including IP telephone settings corresponding to the MAC address of the gateway device 10 registered in advance (step S22), and notifies the information with a DHCP OFFER message (step S23).

  If the information included in the DHCP OFFER message does not exceed the setting items to be recorded in the DHCP setting information, the protocol processing unit 111 sends a DHCP REQUEST message to request information from the DHCP server 110 (step S24).

  When the protocol processing unit 111 receives the DHCP ACK message sent from the DHCP server 110 (step S25), the extraction unit 112 extracts the DHCP setting information from the information included in the DHCP ACK message and records it in the setting storage unit 15. (Step S26).

  Next, the process of step S13 in which the gateway device 10 issues an IP address to the VoIP terminal device 20 will be described.

  FIG. 7 is a sequence diagram illustrating a flow of processing in which the gateway device 10 issues an IP address to the VoIP terminal device 20.

  First, when the protocol processing unit 121 of the DHCP server unit 12 receives the DHCP DISCOVER message sent from the VoIP termination device 20 (step S31), the determination unit 122 includes the MAC address of the VoIP termination device 20 included in the DHCP DISCOVER message, The VoIP terminator information recorded in the setting storage unit 15 is collated (step S32).

  If the verification is successful, the generation unit 123 reads the VoIP terminal device information, the gateway device internal setting information, and the DHCP setting information from the setting storage unit 15, and pays the IP address registered in the VoIP terminal device information to the VoIP terminal device 20. A DHCP OFFER message and a DHCP ACK message are generated from the gateway device internal setting information and the DHCP setting information (step S33). FIG. 8 shows how DHCP information to be sent to the VoIP terminal device 20 is generated from the VoIP terminal device information, the gateway device internal setting information, and the DHCP setting information.

  The generated DHCP OFFER message is sent to the VoIP terminal device 20 (step S34). Upon receiving the DHCP REQUEST message (Step S35), the protocol processing unit 121 sends a DHCP ACK message to the VoIP terminal device 20 (Step S36).

  When the MAC address cannot be verified, that is, when the source of the DHCP DISCOVER message is not the VoIP terminal device 20, the DHCP server unit 12 notifies an IP address other than the IP address registered in the DHCP setting information. Thereby, both the VoIP terminal device 20 and the non-VoIP terminal 30 can be simultaneously connected to the network without overlapping the IP addresses.

  Next, the process in which the gateway apparatus 10 in step S14 generates SIP information and notifies the VoIP termination apparatus 20 will be described.

  FIG. 9 is a sequence diagram showing a flow of processing in which the gateway device 10 notifies the VoIP termination device 20 of SIP information.

  First, the VoIP terminal device 20 transmits a SIP information request message using HTTP (Hypertext Transfer Protocol) (step S41). An example of the SIP information request message is shown in FIG. In the SIP information request message, the MAC address of the transmission source terminal is set in order to identify that the transmission source is the VoIP terminator 20.

  The message processing unit 131 of the SIP information notifying unit 13 that has received the SIP information request message reads the VoIP termination device setting information from the setting storage unit 15 and registers it in the MAC address and VoIP termination device setting information set in the SIP information request message. The obtained MAC address is checked (step S42).

  If the verification is successful, the generation unit 132 reads the gateway device internal setting information and the DHCP setting information from the setting storage unit 15 and generates SIP information (step S43). FIG. 11 shows how SIP information is generated from gateway device internal setting information and DHCP setting information.

  Then, a SIP information response message corresponding to the received SIP information request message is transmitted using HTTP (step S44). An example of the SIP information response message generated from the SIP information of FIG. 11 is shown in FIG. When the MAC address cannot be verified, an HTTP error message (for example, 403 Forbidden) is transmitted as a response.

  Next, a description will be given of the flow of processing in which when a change occurs in the setting information managed by the IP telephone network 100 while using the VoIP service, the change is reflected in the gateway device 10 or the VoIP terminal device 20. The change of the setting information managed by the IP telephone network 100 is, for example, the change of the IP address set in the gateway device 10 or the change of the routing information accompanying the installation work on the network side.

  FIG. 13 is a flowchart showing the flow of processing for reflecting changes that have occurred in the setting information managed by the IP telephone network 100 to the gateway device 10 and the VoIP terminal device 20.

  First, the DHCP client unit 11 receives a reacquisition request transmitted from the DHCP server 110 arranged in the IP telephone network 100 (step S51). As a reacquisition request, the DHCP server 110 transmits a DHCP FORCERENE message that prompts reacquisition of DHCP setting information.

  The DHCP client unit 11 that has received the reacquisition request reacquires DHCP setting information from the DHCP server 110 and records it in the setting storage unit 15 (step S52). Note that the DHCP client unit 11 re-acquires the DHCP setting information in the same manner as the processing in steps S21 to S26 shown in FIG.

  Subsequently, the transfer setting unit 113 resets the packet transfer for using the VoIP service (step S53).

  Subsequently, the DHCP client unit 11 transmits a control signal that prompts the DHCP server unit 12 to request a setting information update, and instructs the VoIP terminal device 20 to reset the information (step S54).

  Then, the DHCP server unit 12 transmits a reacquisition request to the VoIP terminal device 20 (step S55). The DHCP server unit 12 transmits a DHCP FORCERENEW message that prompts reacquisition of DHCP information as a reacquisition request. The reacquisition request is transmitted to all terminals registered in the VoIP termination device setting information.

  The DHCP server unit 12 generates and notifies the DHCP information in response to the DHCP information reacquisition request from the VoIP terminal device 20 (step S56). The process for generating and notifying the DHCP information is the same as the process in steps S31 to S36 shown in FIG.

  Thereafter, the SIP information notifying unit 13 generates and notifies SIP information in response to a request from the VoIP terminating device 20 (step S57). This processing is the same as the processing in steps S41 to S44 shown in FIG.

  Thereafter, the packet transfer unit 14 transfers a packet between the VoIP terminal device 20 and the IP telephone network 100 and a packet between the non-VoIP terminal 30 and the data communication network 200 (step S58).

  Therefore, according to the present embodiment, information relating to the VoIP terminator 20 communicating with the IP telephone network 100 is registered in the VoIP terminator setting information, information relating to the IP telephone network 100 is registered in the DHCP setting information, and transfer is performed. The setting unit 113 generates packet transfer setting information that defines a packet transfer rule from the VoIP terminator setting information and DHCP setting information, and the generation unit 132 generates SIP information from the gateway device internal setting information and DHCP setting information. By notifying the terminating device 20, the gateway device 10 and the VoIP terminating device 20 can be set without bothering the user. In addition, by registering the VoIP termination device 20 that communicates with the IP telephone network 100 in the VoIP termination device setting information, the device connected to the LAN side of the gateway device 10 is connected to either the IP telephone network 100 or the data communication network 200. Since it can be distinguished whether it is what communicates, the user can use a VoIP service and the internet simultaneously.

  According to the present embodiment, when the setting information managed by the IP telephone network 100 is changed, the DHCP setting information is updated by a request from the DHCP server 110, and the packet transfer setting information is updated based on the DHCP setting information. By updating and instructing the VoIP terminal device 20 to reset the information, the service can be continuously used without bothering the user.

DESCRIPTION OF SYMBOLS 10 ... Gateway apparatus 11 ... DHCP client part 110 ... DHCP server 111 ... Protocol processing part 112 ... Extraction part 113 ... Transfer setting part 12 ... DHCP server part 120 ... SIP server 121 ... Protocol processing part 122 ... Determination part 123 ... Generation part 13 ... SIP information notification unit 131 ... message processing unit 132 ... generation unit 14 ... packet transfer unit 141 ... address conversion unit 142 ... filtering unit 143 ... routing unit 15 ... setting storage unit 20 ... VoIP termination device 30 ... terminal 40 ... setting terminal 100 ... IP telephone network 200 ... Data communication network

Claims (6)

A gateway device for connecting a data communication network and an IP telephone network to the WAN side,
Storage means for storing terminal setting information in which information relating to a terminal communicating with the IP telephone network is registered and network side information in which information relating to the IP telephone network is registered;
A terminal that reads the terminal setting information and the network side information from the storage means, relays a packet between the terminal registered in the terminal setting information and the IP telephone network, and is not registered in the terminal setting information Transfer setting means for generating transfer information to be set so as to relay a packet between the data communication network and the storage means,
A transfer unit that refers to the transfer information and relays a packet between a terminal connected to the LAN side and the data communication network or the IP telephone network;
When IP telephone information required for communication with the IP telephone network is requested from the terminal, it is determined whether or not the terminal is registered in the terminal setting information, and the terminal is registered in the terminal setting information. A notification means for notifying the IP phone information set in the terminal,
A gateway device comprising:   When the network side information reacquisition request is received from the IP telephone network, the network side information is updated, and an update requesting the terminal registered in the terminal setting information to update the setting of the terminal The gateway apparatus according to claim 1, further comprising: means. A gateway device relay method for connecting a data communication network and an IP telephone network to a WAN side,
The terminal setting information and the network side information are read out from storage means for storing terminal setting information in which information related to a terminal communicating with the IP telephone network is registered and network side information in which information related to the IP telephone network is registered. Transfer information configured to relay a packet between the terminal registered in the information and the IP telephone network, and to relay a packet between the terminal not registered in the terminal setting information and the data communication network Generating and storing in the storage means;
Referring to the transfer information and relaying a packet between a terminal connected to the LAN side and the data communication network or the IP telephone network;
When IP telephone information required for communication with the IP telephone network is requested from the terminal, it is determined whether or not the terminal is registered in the terminal setting information, and the terminal is registered in the terminal setting information. If not, the step of notifying the IP phone information to be set in the terminal;
A relay method comprising:   When receiving a request for reacquisition of the network side information from the IP telephone network, updating the network side information and requesting the terminal registered in the terminal setting information to update the setting of the terminal The relay method according to claim 3, further comprising:   The relay program for functioning a computer as each means which comprises the gateway apparatus of Claim 1 or 2.   A recording medium on which a relay program for causing a computer to function as each means constituting the gateway device according to claim 1 or 2 is recorded.

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