JP2004056621A - Ppp terminating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PPP (Point-to-Point Protocol) terminating device that simultaneously connects a PC and a different H.323 terminal to the Internet by using one IP address. <P>SOLUTION: This device is provided with a LAN side communication network transmitting/receiving part 11, a WAN side communication network transmitting/receiving part 12, a PPPoE analyzing part 13 for analyzing a PPPoE (Point-to-Point Protcol over Ethernet) packet in received data, a PPP analyzing part 14 for analyzing a PPP packet, a VoIP analyzing part 15 for determining whether an IP packet is a VoIP packet, a PPP server 17 for terminating a PPP link, a PPPoE server 16 for terminating a PPPoE session, and a session information management table 18 for managing PPPoE session information and PPP link information. A first IP communication connection request is connected to a WAN side IP device, and a second H.323 communication connection request is terminated. H.323 communication connection is established with a WAN side VoIP telephone set to perform H. 323 communications between the LAN side and the WAN side VoIP telephone set. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides one communication between a plurality of IP devices connected to a WAN type IP communication network and a plurality of IP devices connected to an Ethernet (registered trademark) LAN by a plurality of communications. The present invention relates to a PPP terminating device that can simultaneously use and communicate with each other.
[0002]
[Prior art]
As shown in FIG. 5, terminal devices 31 and 32 accommodated in a LAN (Ethernet) are connected to terminal devices accommodated in a WAN (Internet) 5 using Point-to-Point Protocol over Ethernet (PPPoE). In the IP communication system, one global IP address is assigned from the WAN 5 to the router 7, and communication is performed between the router 7 and the WAN 5 using this global address. Further, communication is performed between the terminal devices 31 and 32 accommodated in the LAN 3 and the router 7 using the assigned local IP address. In this case, the Internet connection by the terminal device (PC) 31 accommodated in the LAN 3 and the H.264 accommodated in the LAN 3 are performed. The Internet cannot be used at the same time as a call via the Internet by the H.323 terminal device (VoIP telephone) 32. In order to connect the PC 31 and the VoIP telephone 32 to the Internet at the same time, the router 7 must be compatible with PPPoE and It was necessary to have a 323 NAT (Network Address Translator) function.
[0003]
H. of router 7 corresponding to PPPoE Using the H.323 NAT function, Internet connection by the PC 31 and H.323 connection are possible. When simultaneously using a telephone call via the Internet by the H.323 terminal device 32, the PC 31 and the H.323 terminal are used. Since the local IP address assigned to the H.323 terminal device 32 is different from the global IP address assigned to the router 7, the local IP address and the global IP address must be converted using the NAT function to make an Internet call. .
[0004]
However, in the case of an Internet call using the NAT function, the router 7 does not support all protocols, and if there is a protocol that cannot be used, communication using this protocol cannot be performed.
[0005]
[Problems to be solved by the invention]
In an IP communication system, a PPP (Point-to-point Protocol) terminating device is provided, a first IP communication is connected to an IP network through a global IP address, and a second PPPoE / PPP connection is terminated. , Using a global IP address that is normally assigned to only one PC, H.323 terminals can be connected to the Internet at the same time.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an IP system for connecting a plurality of terminal devices corresponding to PPPoE accommodated in a LAN to a WAN (Internet), and a PPPoE terminal device (PC) and an H.264 terminal. A PPPoE termination device is provided between the LAN accommodating the H.323 terminal device (VoIP telephone) and the Internet, and the terminal device (PC) or the H.323 terminal is used. The first PPPoE connection between the H.323 terminal device (VoIP telephone) and the WAN is passed through. The second PPPoE connection from the H.323 terminal device (VoIP telephone) or the terminal device (PC) is terminated by the PPP termination device.
[0007]
That is, the present invention provides a terminal device (PC) that supports PPPoE connection and an H.323 terminal that supports PPPoE. The H.323 terminal device (VoIP telephone) is connected to the LAN-side Ethernet of the PPP termination device, and this PPP termination device is connected to the WAN-side Ethernet.
[0008]
According to the present invention, in such an IP system, the first PPPoE / PPP connection is passed through from the LAN side to the WAN side, and the global IP address assigned by the provider is stored.
[0009]
The second PPPoE / PPP connection terminates at the PPP terminating device, and notifies the global IP address assigned by the provider through the first PPP connection.
[0010]
The PPPoE packet received on the LAN side of the PPP terminating device is H.264. In the case of the H.323 protocol, the terminal device that has transmitted the packet is H.323. 323 terminal device. In addition, the H.323 set in the session information management table of the PPP terminal device. According to the MAC address of the H.323 terminal device, H.323 is used. The H.323 terminal device is recognized.
[0011]
The PPP terminating device receives the H.323 received from the WAN side. The inside of the H.323 packet is analyzed. If it is determined that the received packet is an H.323 packet, the destination of the received packet is H.323. 323 terminal device.
[0012]
The H.2 protocol received on the WAN side of the PPP terminating device. The H.323 packet is the H.323 packet. H.323 terminal device recognition procedure. It transmits to the terminal device recognized as the H.323 terminal device.
[0013]
One end is a personal computer (PC) or H. In a PPP terminating device connected to a LAN accommodating a H.323 terminal device and the other end connected to a WAN (Internet) via a bridge, for example, a first connection for connecting a PC 31 to a WAN is a PPPoE / PPP connection. As a pass through from the LAN side to the WAN side via the PPP terminating device and the router as H. In the second connection for connecting the H.323 terminal device to the WAN, the PPPoE / PPP connection on the LAN side is terminated by the PPP termination device. Recognition of which terminal device the IP packet received from the LAN side by the PPP terminating device is performed based on PPPoE session information. The IP packets received from the WAN are distributed to terminal devices connected to the LAN.
[0014]
In this way, PPPoE is terminated, and a plurality of terminal devices accommodated in the LAN can share an IP address to which only one is assigned to a PPPoE1 session.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
With reference to FIG. An outline of the configuration of an IP communication system using a PPP termination device according to the present invention, in which a H.323 terminal device (VoIP telephone) performs IP communication simultaneously using one IP address, will be described.
[0016]
This IP communication system includes a terminal device (PC) 31 housed in a LAN 3 connected to the PPP H.323 terminal device (VoIP telephone) 32 and a terminal device (PC) 54 connected to the IP communication network 5; This is a system for performing IP communication with a H.323 terminal device (VoIP telephone) 53. The PPPoE terminating device 1 is connected to the IP communication network 5 via a bridge 51 and a PPPoE server 52. The terminal device (PC) 31 housed in the LAN 3 executes IP communication with a communication terminal (PC) 54 in the IP communication network 5, The H.323 terminal device (VoIP telephone) 32 is an H.323 terminal within the IP communication network. An IP call is made with the H.323 terminal device (VoIP telephone) 53 via the Internet.
[0017]
The first IP communication passes through the PPP terminating device 1 and is connected by PPPoE, and the second IP communication terminates the PPPoE connection on the LAN side by the PPP terminating device 1.
[0018]
The outline of the structure of the PPP termination device 1 according to the present invention will be described with reference to FIG. The PPP terminating device 1 includes a LAN-side Ethernet transmitting / receiving unit 11 connected to the LAN 3, a WAN-side Ethernet transmitting / receiving unit 12 connected to the WAN (IP communication network) 5, a PPPoE analyzing unit 13, a PPP analyzing unit 14, It comprises a VoIP analysis unit 15, a PPPoE server 16, a PPP server 17, and a session information management table 18. In the figure, a solid line indicates the flow of a packet, and a dotted line indicates reading and writing of a table.
[0019]
The LAN-side Ethernet transmission / reception unit 11 has a function of transmitting a transmission packet requested from the WAN-side Ethernet transmission / reception unit 12, the PPPoE analysis unit 13, and the like to the LAN-side interface during transmission. Also, at the time of reception, the LAN-side Ethernet transmitting / receiving unit 11 extracts a PPPoE packet from the data received from the LAN-side interface, transmits the packet to the PPPoE analyzing unit 13, and transfers the other packets to the WAN-side Ethernet transmitting / receiving unit 12. It has the function to do.
[0020]
The WAN-side Ethernet transmission / reception unit 12 has a function of transmitting a transmission packet requested by the LAN-side Ethernet transmission / reception unit 11 and the PPPoE analysis unit 13 to the WAN-side interface during transmission. Further, at the time of reception, the WAN-side Ethernet transmitting / receiving unit 12 extracts a PPPoE packet from data received from the WAN-side interface, transmits the packet to the PPPoE analyzing unit 13, and transfers other packets to the LAN-side Ethernet transmitting / receiving unit 11. It has the function to do.
[0021]
The PPPoE analysis unit 13 analyzes the PPPoE packet received from the LAN-side Ethernet transmission / reception unit 11, transmits the first PPPoE discovery packet to the WAN-side Ethernet transmission / reception unit 12, and transmits the first PPPoE session packet to the PPP analysis unit 14. It has a function of transmitting and transmitting the second PPPoE discovery / session packet to the PPPoE server 16.
[0022]
Further, the PPPoE analyzing unit 13 has a function of analyzing a PPPoE packet received from the WAN-side Ethernet transmitting / receiving unit 12, transmitting a PPPoE session packet to the PPP analyzing unit 14, and transmitting a PPPoE discovery packet to the LAN-side Ethernet transmitting / receiving unit 11. Have.
[0023]
The PPP analysis unit 14 analyzes a PPP packet in the PPPoE session packet received from the PPPoE analysis unit 13 and transmits the PPP packet to the VoIP analysis unit 15 if the payload of the PPP packet is an IP packet. It has a function of encapsulating it in the existing PPPoE session and transmitting it to the LAN-side Ethernet transmitting / receiving unit 11.
[0024]
The VoIP analysis unit 15 analyzes an IP packet in the PPPoE session packet received from the PPP analysis unit 14, and if the packet is a VoIP packet, encapsulates the packet into a PPPoE session used by the VoIP telephone 32 and transmits the encapsulated packet to the LAN-side Ethernet transmitting / receiving unit 11. If the packet is not a VoIP packet, it has a function of encapsulating the packet into a PPPoE session used by the PC 31 and transmitting the encapsulated packet to the LAN-side Ethernet transmitting / receiving unit 11.
[0025]
The PPPoE server 16 performs a PPPoE server operation for terminating the second PPPoE session received from the LAN side.
[0026]
The PPP server 17 performs a PPP server operation for terminating the second PPP link received from the LAN.
[0027]
The session information management table 18 is a table for managing the first / second PPPoE session information and the information of the PPP link.
[0028]
In the PPP terminating device having this configuration, an IP device (terminal device (PC31) /H.323 terminal device 32 (VoIP telephone 32)) is connected to the LAN-side Ethernet transmitting / receiving unit 11 and a bridge is connected to the WAN-side Ethernet transmitting / receiving unit 12. Connect. The bridge connects to an IP communication network via a communication line.
[0029]
The IP device (terminal device (PC 31) /H.323 terminal device 32 (VoIP telephone 32)) has a PPPoE client function. The PPPoE server 16 permits one PPPoE session per communication line.
[0030]
In the session information management table 18 of the PPP terminal device 1, H. The MAC address of the H.323 terminal device 32 is set. Alternatively, the PPPoE packet received on the LAN side of the PPP terminating device is H.264. In the case of the H.323 protocol, the terminal device that has transmitted the packet is H.323. 323 terminal device.
[0031]
Referring to FIG. 3, an Internet connection by the terminal device (PC 31) and H.264 connection will be described. H.323 via the Internet by the H.323 terminal device 32 (VoIP telephone 32). The procedure up to the simultaneous use of the H.323 call will be described.
[0032]
The PC 31 transmits a PADI (PPPoE Active Discovery Initiation) packet by broadcast to start PPPoE connection (procedure 1).
[0033]
The PPP terminating device 1, which has received the PADI packet from the LAN side, transmits the received PADI packet to the IP communication network 5 side since the PPPoE connection is not currently established (procedure 2).
[0034]
The PPPoE server 52 such as the NTT or the provider of the IP communication network 5 that has received the PADI packet transmits a PADO (PPPoE Active Discovery Offer) packet to the MAC address of the PC 31 (step 3).
[0035]
The PPP terminating device 1 that has received the PADO packet from the IP communication network 5 transmits the received PADO packet to the PC 31 (procedure 4).
[0036]
The PC 31 that has received the PADO packet transmits a PADR (PPPoE Active Discovery Response) packet to the MAC address of the PPPoE server 52 on the side of the IP communication network 5 (Step 5).
[0037]
The PPP terminating device 1 that has received the PADR packet from the PC 31 transmits the received PADR packet to the IP communication network 5 (procedure 6).
[0038]
The PPPoE server 52 on the side of the IP communication network 5 that has received the PADR packet transmits a PADS (PPPoE Active Discovery-Configuration) packet to the MAC address of the PC 31 (step 7).
[0039]
The PPP terminating device 1 that has received the PADS packet from the IP communication network 5 transmits the received PADS packet to the PC 31 (procedure 8).
[0040]
When the PC 31 receives the PADS packet (procedure 9), a PPPoE connection between the PC 31 and the PPPoE server 52 on the side of the IP communication network 5 is established.
[0041]
A PPP connection is established using the PPPoE connection established between the PC 31 and the PPPoE server 52 on the side of the IP communication network 5 (procedure 10).
[0042]
The PPP termination device 1 monitors a PPP packet between the PC 31 and the PPPoE server 52 on the side of the IP communication network 5, and stores PPP authentication information, IP address information, and the like (procedure 11).
[0043]
IP communication is performed between the PC 31 and the PC 54 on the side of the IP communication network 5 (procedure 12).
[0044]
Here, the H.264 via the Internet is used. I want to make a H.323 call. The H.323 terminal device 32 transmits a PADI packet by broadcast to start PPPoE connection (procedure 13).
[0045]
H. The PPP terminating device 1 that has received the PADI packet from the H.323 terminal device 32 operates as a PPPoE server because a PPPoE connection has already been established between the PC 31 and the PPPoE server 52. A PADO packet is transmitted to the MAC address of the H.323 terminal device 32 (procedure 14).
[0046]
H. receiving the PADO packet The H.323 terminal device 32 transmits a PADR packet to the MAC address of the PPPoE server 16 of the PPP termination device 1 (procedure 15).
[0047]
H. The PPP termination device 1 that has received the PADR packet from the H.323 terminal device 32 The PADS packet is transmitted to the MAC address of the H.323 terminal device 32 (procedure 16).
[0048]
H. When the H.323 terminal apparatus 32 receives the PADS packet, the H.323 terminal apparatus 32 receives the PADS packet. The PPPoE connection between the H.323 terminal device 32 and the PPPoE server 16 of the PPP termination device 1 is established (step 17).
[0049]
H. The PPP connection is established using the PPPoE connection established between the H.323 terminal device 32 and the PPPoE server 16 of the PPP termination device 1 (step 18). At this time, the authentication information and the IP address information of the PPP use the information stored in the procedure 11. PC31 and H.P. The IP address of the PPPoE interface of the H.323 terminal device 32 is the same.
[0050]
The PPP terminating device 1 is an H.264 terminal. H.323 from the H.323 terminal device 32 H.323 protocol packets are transmitted to the H.323 of the IP communication network 5. H.323 terminal device (VoIP telephone) 53 side, while analyzing packets from the IP communication network 5 side. H.323 protocol packets are H.323 terminal device 32, and H.323 terminal device 32 and the H.323 on the IP communication network 5 side. H.323 communication with the H.323 terminal device 53. 323 communication is performed (procedure 19).
[0051]
Similarly, the PPP terminating device 1 transmits the H.264 message from the PC 31. A packet other than the H.323 protocol is transmitted to the PC 54 of the IP communication network 5, and a packet from the PC 54 of the IP communication network 5 is analyzed. A packet other than the H.323 protocol is transmitted to the PC 31, and IP communication is performed between the PC 31 and the PC 54 on the side of the IP communication network 5 (procedure 20).
[0052]
In this way, the terminal device (PC) 31 accommodated in the PPPoE terminal device 1 and the H.323 terminal device (VoIP telephone) 32, a terminal device in the IP communication network 5, and the H.323 terminal device. It is possible to simultaneously perform IP communication with the H.323 terminal device (VoIP telephone) 53 using one IP address.
[0053]
The outline of the configuration of the PPP terminating device 1 according to the second embodiment of the present invention will be described with reference to FIG.
[0054]
The PPP terminating device 1 includes a LAN-side Ethernet transmitting / receiving unit 11 connected to the LAN 3, a WAN-side ADSL transmitting / receiving unit 19 connected to the WAN (IP communication network) 5, a PPPoE analyzing unit 13, a PPP analyzing unit 14, It comprises a VoIP analysis unit 15, a PPPoE server 16, a PPP server 17, and a session information management table 18. Further, the PPP terminal device 1 according to the present embodiment includes a key input control unit 20, a call control unit 21, a voice control unit 22, H.323 control unit 23, TCP / IP control unit 24, PPP client 25, and PPPoE client 26. In the figure, a solid line indicates the flow of a packet, and a dotted line indicates reading and writing of a table.
[0055]
At the time of transmission, the LAN-side Ethernet transmission / reception unit 11 transmits a transmission packet requested by the WAN-side ADSL transmission / reception unit 19, the PPPoE analysis unit 13, and the like to the LAN-side interface. Upon reception, the LAN-side Ethernet transmission / reception unit 11 transmits a PPPoE packet of the data received from the LAN-side interface to the PPPoE analysis unit 13 and transmits other packets to the WAN-side ADSL transmission / reception unit 19.
[0056]
The PPPoE analysis unit 13 analyzes the PPPoE packet received from the LAN-side Ethernet transmission / reception unit 11, transmits the PPPoE discovery packet to the WAN-side ADSL transmission / reception unit 19, and transmits the PPPoE session packet to the PPPoE analysis unit 13.
[0057]
The PPPoE analyzing unit 13 analyzes the PPPoE packet received from the WAN-side ADSL transmitting / receiving unit 19, transmits the PPPoE session packet to the PPP analyzing unit 14, and sends the PPPoE discovery packet to the LAN-side Ethernet transmitting / receiving unit 11.
[0058]
The PPP analysis unit 14 analyzes a PPP packet among the PPPoE packets received from the PPPoE analysis unit 13, and transmits the PPP packet to the VoIP analysis unit 15 if the payload of the PPP packet is an IP packet. The packet is encapsulated in the existing PPPoE session and transmitted to the LAN-side Ethernet transmitting / receiving unit 11.
[0059]
The VoIP analysis unit 15 analyzes an IP packet in the PPPoE packet received from the PPP analysis unit 14, transmits the VoIP packet to the TCP / IP control unit, and if the packet is not a VoIP packet, encapsulates the packet in the PPPoE session used by the PC 31. And sends it to the LAN-side Ethernet transmitting / receiving unit 11.
[0060]
When a PPPoE session is established between the PPPoE client 26 and the PPPoE on the IP communication network 5 side, the PPPoE server 16 performs a PPPoE server operation for terminating the PPPoE session received from the LAN side.
[0061]
When a PPP link has been established between the PPP client 25 and the PPP server on the IP communication network 5 side, the PPP server 17 performs a PPP server operation for terminating the PPP link received from the LAN side.
[0062]
The session information management table 18 is a table for managing PPPoE session information and PPP link information between the PC 31 on the LAN side and the PPPoE / PPP server on the IP communication network 5 side. The session information management table 18 includes session information between a PC 31 on the LAN side and a PPPoE client 26 / PPP client 25 between the PPPoE analyzer 13 / PPP analyzer 14 and a PPPoE / PPP server on the IP communication network 5 side; It is a table for managing link information.
[0063]
At the time of transmission, the WAN-side ADSL transmission / reception unit 19 transmits a transmission packet requested by the LAN-side Ethernet transmission / reception unit 11 and the PPPoE analysis unit 13 to the WAN-side interface. At the time of reception, the WAN-side ADSL transmission / reception unit 19 transmits a PPPoE packet of the data received from the WAN-side interface to the PPPoE analysis unit 13, and transmits other packets to the LAN-side Ethernet transmission / reception unit 11.
[0064]
The key input control unit 20 captures user operations such as key input and hook.
[0065]
The call control unit 21 transmits the H.264 call at the time of calling by key input or the like. The call request is sent to the H.323 control unit 23. When receiving a call from within the Internet network 5, the voice control unit 22 is requested to output a ring tone. Such a call is controlled.
[0066]
The voice control unit 22 performs a microphone input, a speaker input, and vocoder / decoder processing.
[0067]
H. The H.323 control unit 23 communicates with the terminal device and the H.323 in the Internet network. H.323 between the H.323 terminal devices 32. The IP signaling process according to the H.323 procedure is performed.
[0068]
The TCP / IP control unit 24 controls the terminal device and the H.264 in the Internet network. It has a function of transmitting and receiving TCP / IP packets to and from the H.323 terminal device 32.
[0069]
The PPPoE client 26 is a PPPoE client for connecting to the PPPoE server 52 of the Internet network 5 when transmitting a terminal device.
[0070]
The PPP client 25 is a PPP client for connecting to a PPP server on the Internet network when transmitting a terminal device.
[0071]
With this configuration, the terminal device (PC) 31 accommodated in the PPP termination device 1 and the H.264 in the PPP termination device 1 are used. H.323 terminal function, the terminal device (PC) 54 in the IP communication network 5 and the H.323 terminal. It is possible to simultaneously perform IP communication with the H.323 terminal device (VoIP telephone) 53 using one IP address.
[0072]
In the above invention, one communication is H.264. Although described using an example using the H.323 protocol, the present invention is based on the H.323 protocol. Not limited to communication using the H.323 protocol, communication using another protocol is also possible. In this case, if the transport protocol used by the corresponding protocol has a fixed port number (TCP port / UDP port) such as TCP / UDP, the VoIP analyzer in FIG. 2 is replaced with a TCP / IP analyzer. It is possible to sort the communication between the PC and the other communication terminals by checking the transport protocol and the port number by the TCP / IP analysis unit.
[0073]
【The invention's effect】
According to the present invention, in a PPPoE connection, a PC accommodated in a LAN and an H.264 connection are used. The H.323 terminal device can communicate with an opposite IP device by simultaneously using the IP communication network.
[0074]
According to the present invention, It can be applied to protocols other than the H.323 terminal device.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an outline of a configuration of an IP communication system using a PPP termination device according to the present invention.
FIG. 2 is a block diagram illustrating an outline of a configuration of a PPP termination device according to the present invention.
FIG. 3 is a connection sequence diagram illustrating connection processing in an IP communication system using the PPP terminating apparatus according to the present invention.
FIG. 4 is a block diagram illustrating an outline of a configuration of a PPP termination device according to a second embodiment of the present invention.
FIG. 5 is a diagram illustrating an outline of a configuration of a conventional IP communication system.
[Explanation of symbols]
1 PPP terminator 11 LAN side Ethernet transmission / reception unit 12 WAN side Ethernet transmission / reception unit 13 PPPoE analysis unit 14 PPP analysis unit 15 VoIP analysis unit 16 PPPoE server 17 PPP server 18 Session information management table 19 WAN side ADSL transmission / reception unit 20 Key input control unit H. 21 Call control unit 22 Voice control unit 23 H.323 control unit 24 TCP / IP control unit 25 PPP client 26 PPPoE client 3 LAN
31 Terminal device (PC)
32H. H.323 terminal device (VoIP telephone)
H.5 IP communication network 51 Bridge / modem 52 PPPoE server 53 H.323 terminal device (VoIP telephone)
54 Terminal device (PC)
7 Router (for PPPoE, H.323 NAT function)

Claims (1)

H. H.323 that communicates according to the H.323 protocol H.323 terminal device and H.323 terminal device. A LAN-side communication network transmission / reception unit for transmitting / receiving data to / from a LAN accommodating a terminal device communicating with a protocol other than the H.323 protocol;
H. H.323 that communicates according to the H.323 protocol H.323 terminal device and H.323 terminal device. A WAN-side communication network transmitting / receiving unit for transmitting / receiving data to / from a WAN accommodating a terminal device communicating with a protocol other than the H.323 protocol;
A PPPoE analyzer for analyzing a PPPoE packet in data received from the LAN-side communication network transceiver and a PPPoE packet in data received by the WAN-side communication network transceiver;
A PPP analysis unit that analyzes a PPP packet of the PPPoE packet;
A VoIP analysis unit that analyzes an IP packet in the PPP packet and determines whether the packet is a VoIP packet;
A PPP server for terminating a PPP link received from the LAN side,
A PPPoE server that terminates a PPPoE session received from the LAN side;
A session management table for managing the first and second PPPoE session information and PPP link information, relaying the first PPPoE / PPP connection from the LAN side to the WAN-side PPPoE / PPP server, and By terminating the second PPPoE / PPP connection with the PPP terminating device and returning the same authentication information / IP information as the first to the LAN side, the LAN side IP communication device and the WAN side IP communication device and the LAN side H. H.323 terminal device and H.323 on the WAN side. A PPP termination device for simultaneously performing communication between H.323 terminal devices.

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