JP2004007516A - GLOBAL IP SHARING METHOD FOR REALIZING VoIP - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a global IP sharing method whereby local IP terminals share a global IP so as to attain the Internet speech between local IP terminals or between one local IP terminal and a global IP terminal. <P>SOLUTION: The method includes: a step of receiving a data packet from a local terminal; a step of detecting an IP and port information for the H.225 processing when the received data packet is gatekeeper registration request data and storing the IP and the port information subjected to masquerading to a global IP assigned to its own IP terminal and an optionally generated port; a step of detecting an IP and port information for the H.245 processing when the received data packet is H.225 processing data and storing the IP and the port information subjected to masquerading to the global IP assigned to its own IP terminal and the optionally generated port; a step of externally transmitting the received data packet; and a step of de-masquerading the IP and the port information detected from the externally received data packet and transmitting the result to the local terminal. <P>COPYRIGHT: (C)2004,JPO

Description

[Object of the invention]
[Technical field to which the invention belongs and conventional technology]
The present invention relates to a method for sharing a global IP, and more particularly, to a method for sharing a global IP so that Internet calls can be made using a local IP.
[0001]
2. Description of the Related Art Generally, in a company or an apartment house such as an apartment, information is shared by connecting a plurality of computer terminals via a private network such as a LAN.
[0002]
Generally, in order for each computer terminal to connect to the Internet, a unique IP address must be assigned from an ISP (Internet Service Provider). However, due to restrictions on IP allocation, the above-mentioned companies or apartment houses use an IP sharing device or an IP sharing program such as Wingate or Midpoint, and a large number of computer terminals are used. The system is being constructed so that it can be connected to the Internet.
[0003]
In such a general IP sharing device, instead of the fixed local (internal) IP address and port information transmitted from the local terminal, the global (external) IP address and port address of the sharing device itself are globally assigned. When the data is transmitted to the terminal and the data is transmitted from the partner global terminal, the data is transmitted to the local terminal having the local IP address and port information stored therein, and the data is transmitted between the local terminal and the global terminal. To perform data communication. That is, since a general IP sharing device has a network address translation (NAT) function (or a NAPT for translating to a TCP layer port), a local terminal can communicate with a global terminal without assigning a global IP address. is there.
[0004]
However, using the above-described general IP sharing device, H.264 that has a higher level of uniqueness than TCP and UDP. Protocols such as H.323 cannot be supported. The reason is that This is because among the protocols constituting the H.323 protocol, there are protocols (H.225, H.245) for exchanging IP address and port information for call setup and release and call control. The positions and meanings of IP and ports for call setup and release and call control are not fixed as at the TCP / IP level, and must be appropriately modified. However, the conventional IP sharing device does not have an address and port conversion function for a protocol higher than the TCP / IP level, so that there is a problem in that VoIP itself cannot be implemented.
[0005]
[Technical problem to be solved by the invention]
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a global IP sharing method in which a plurality of local terminal users can make an Internet call by securing only one global (Global) IP.
[0006]
Another object of the present invention is to reduce the number of data that must be processed for performing an Internet call when an Internet call is made between local terminals, thereby reducing the load processing load on an IP sharing device. Of course, it is an object of the present invention to provide a global IP sharing method for making a quick call.
[0007]
[Configuration of the Invention]
To achieve the above object, a global IP sharing method according to an embodiment of the present invention includes:
Receiving a data packet from a local terminal;
If the received data packet is gatekeeper registration request data, Detecting the IP and port information for the H.225 processing, masquerading the global IP allocated to itself and an arbitrarily generated port, and storing them;
The received data packet is H.264. 225 processing data, Detecting IP and port information for H.245 communication, and masquerading and storing the global IP allocated to itself and an arbitrarily generated port;
The received data packet is H.264. If it is H.245 processing data, detecting IP and port information for voice / image / data communication, masquerading the global IP allocated to itself and an arbitrarily generated port, and storing the masqueraded data;
Transmitting the received data packet to the outside;
De-masquerading the IP and port information detected from the data packet received from the outside and transmitting the information to the corresponding local terminal.
[0008]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration will unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted.
[0009]
FIG. 1 illustrates a system configuration diagram according to an embodiment of the present invention.
[0010]
Referring to FIG. 1, a system according to an embodiment of the present invention includes a plurality of local terminals 10 and an IP sharing device 20 connected in a local area network (LAN). Each of the local terminals is assigned a local IP, and the IP sharer 20 is also assigned a local IP and a global IP. Each of the local terminals 10 can receive Internet services via the IP sharing device 20, and can make Internet calls with other local terminals connected to the private network or a global terminal 50 connectable to the Internet. .
[0011]
The IP sharing device 20 supports the Internet communication between the internal local terminal or the internal local terminal 10 and the external global terminal 50 based on the global IP sharing program data according to the embodiment of the present invention. The IP sharing device 20 for implementing the present invention includes a hash table for registering and storing masqueraded IP and port information. It can be said that such an IP sharing device 20 basically has the address conversion function of the conventional IP sharing device.
[0012]
The gateway (G / W) 30 performs a role of a bridge connecting a circuit switching network (not shown) and a packet switching network.
[0013]
The gatekeeper (Gatekeeper: G / K) 40 is a H.264 gate. It performs functions such as address translation and access control for the H.323 terminal, that is, the local terminal, and informs the terminal of the position of the gateway 30 to the terminal and manages the bandwidth.
[0014]
Hereinafter, a global IP sharing method performed by the IP sharing device 20 of the system having the above configuration will be described in more detail with reference to the accompanying drawings.
[0015]
FIG. 2 is a flowchart illustrating a data packet process in the IP sharing device 20 according to an embodiment of the present invention. More specifically, a case in which the local terminal 10 performs forwarding to the global terminal 50 is described. 3 is a flowchart of a data packet processed by the IP sharing device 20. The IP sharing device 20 according to the embodiment of the present invention is an H.264 for implementing VoIP. In order to process the H.323 protocol, basically, a process of registering the local terminal 10 with the gatekeeper 40 must be performed, and a data packet processing process by a telephone call must be performed.
[0016]
Referring to FIG. 2, when a data packet is received from the local terminal 10 (step 100), the IP sharer 20 proceeds to step 110, where the source of the source included in the received data packet is transmitted. Check if the port is masqueraded. If the result of the check indicates that the source port is not masqueraded, the process proceeds to step 120, where the source IP and port of the TCP / IP layer are masqueraded to the global IP and port assigned to the IP sharing device 20. That is, address conversion is performed in the TCP / IP layer as in a general IP sharing device.
[0017]
If the result of the check at step 110 indicates that the source port has already been masqueraded, the IP sharer 20 proceeds to step 115 and changes the source IP and port to the already masqueraded IP and port. Then, the IP sharer 20 determines whether the received data packet has passed H.130, 140, and 150. It checks whether the data is registration data (RRQ: Registration Request), interconnection data (H.225), and call control data (H.245) by the H.323 protocol stack.
[0018]
If the results of steps 130, 140, and 150 do not include any data for performing an Internet call, the IP sharer 20 according to the embodiment of the present invention is the same as a general IP sharer. The masqueraded data packet including its own IP and port is transmitted to the outside (step 160).
[0019]
However, if the received data packet is the gatekeeper 40 registration data (RRQ) as a result of the inspection at step 130 (determined based on the presence or absence of the destination port information “1719”), the IP sharing device 20 proceeds to step 132 and receives the received data packet. A call signal (Call Signal) IP / port and a RAS (Registration Admission Status) message IP / port are detected from the received data packet. Then, the IP sharer 20 masquerades the detected call signal IP / port and RAS message IP / port to a global IP allocated to itself and an arbitrarily generated port (step 134). By registering the IP / port and the masqueraded IP / port in a hash table (step 136), the call signal port is set to H.264. It is registered in the 225 processing port. Thereafter, the IP sharing device 20 transmits the received data packet to the gatekeeper 40 (operation 138).
[0020]
Accordingly, the call signal IP / port of the local terminal (source) and the IP / port of the RAS message are masqueraded and stored inside the IP sharer 20, and the gatekeeper 40 is masqueraded by the IP sharer 20. The transmitted call signal port is registered. For reference, the call signal port information is used for a call for an Internet call thereafter.
[0021]
As described above, after the registration of the local terminal with the gatekeeper 40 is completed, the data packet received from the local terminal is transmitted according to H.264. If the interconnected data is based on the H.225 protocol (step 140), the IP sharing device 20 performs steps 141 to 147. For reference, a method of determining whether a data packet is interconnected data is described in H. The port information (“1720”) specified in the H.323 standard recommendation is included in the data packet, or the H.323 registered in step 136 is registered. It can be determined by examining whether 225 processing port information (that is, a call signal port) is included. If the interconnection data is included in the data packet according to the above determination method, the IP sharing device 20 detects an IP / port for call control (H.245) in the received data packet (operation 141). Generally, the port for call control (H.245) is included in the Alerting message. On the other hand, IP sharer 20 detects the detected H.264. The IP / port for H.245 communication is masqueraded to the global IP of the IP sharing device 20 and a port arbitrarily generated (step 142), and the detected IP / port and the masqueraded IP / port are registered in a hash table (143). Step), the detected port is set to H.264. It will be registered as a 245 communication port.
[0022]
Thereafter, the IP sharer 20 proceeds to step 144 to determine the fast start mode (if an H.245 port table for fast start processing is additionally included) and execute the fast start mode. If so, the process proceeds to step 145 to detect an IP and a port for voice / image / data communication from the received data packet. For reference, the port for voice / image / data communication is H.264. It is transmitted via the 245 port (transmitted via Alerting and Connect). When a port for voice / image / data communication is detected, it is masqueraded and registered (step 146) with its own global IP and an arbitrarily generated port, and then proceeds to step 147 to receive the received data packet. To the outside. When the masquerading of the IP / port for voice / image / data communication is completed, a data packet is transmitted to the global terminal via the masqueraded IP and port, and transmitted from the global terminal. If the IP and port included in the data packet are masqueraded and transmitted to an internal local terminal, a normal Internet call can be made. If the result of the check in step 144 is that the mode is the normal mode instead of the fast start mode, the IP sharer 20 proceeds to step 147 and requests the interconnection by transmitting the data packet to the outside (gate keeper). It will be.
[0023]
Meanwhile, the IP sharing device 20 determines whether the received data packet is call control (H.245) data (operation 150). As a determination method, H.R. The determination can be made based on whether or not 245 communication port information is included. If the result of the determination is that the data is for call control, the IP sharer 20 proceeds to step 152, detects the IP and port for voice / image / data communication from the received data packet, and replaces the detected IP and port with its own. It is masqueraded (step 154) to the global IP and an arbitrarily generated port and stored. Then, the IP sharer 20 transmits the masqueraded data packet including the IP and the port to the outside (global terminal), and thereafter, is transmitted between the local terminal 10 and the global terminal 60. A data packet for an Internet call is transmitted to the global terminal 60 and the local terminal 10 through a masquerading and de-masquerading process in the IP sharing device 20.
[0024]
Accordingly, the local terminal 10 can perform a normal Internet call with the global terminal 60 by sharing the global IP allocated to the IP sharing device 20.
[0025]
FIG. 3 is a flowchart illustrating a data packet process performed by the IP sharing device 20 according to an embodiment of the present invention. More specifically, FIG. 3 illustrates a data packet processing flowchart when the destination is the IP sharing device 20. This is illustrated. FIG. 4 is a diagram illustrating a process of transmitting data between local terminals 10 according to an embodiment of the present invention.
[0026]
First, referring to FIG. 3, when a data packet destined for itself is received (step 200), the IP sharer 20 is a port whose port information included in the received data packet has already been masqueraded. An inspection is performed (step 210). If the port is not a masqueraded port, it is data for its own control (for example, if a Telnet connection is made with an IP sharing device, or if it is TCP port 23 and a web page connection). Proceed and process internally. However, if the result of the inspection at step 210 indicates that the port is a masqueraded port, the IP sharer 20 de-masquerades the IP and port of the TCP / IP layer and transmits it to the corresponding local terminal 10 (step 250).
[0027]
That is, when a data packet destined for itself is received, the IP sharer 20 checks whether the port is already masqueraded, de-masquerades it, and transmits it to the internal local terminal 10. Just fine. However, since data for the interconnection (H.225) of the communication partner may be received from the internal local terminal 10 or the external global terminal 50, the time between steps 220 and 250 may be reduced. It must be checked whether the received data packet is interconnected data (step 230).
[0028]
If it is determined in step 230 that the received data packet is interconnected data, the IP sharing device 20 proceeds to step 232, and checks whether the interconnected data is Call Setup data (Q.931). As a result of the inspection, if the call connection data, the H.264 data is transmitted from the data packet transmitted from the other terminal in response thereto. 245 communication IP / port is detected (step 234), and the detected port is set to H.245. It is registered in the 245 communication port (step 236). The reason for this is that when a call is made from the inside to the outside, the outside responds to the call. This is because a data packet (Alerting, Connect) based on the H.245 protocol is received, and data transmitted through the packet is normally transmitted to a destination.
[0029]
On the other hand, if the result of the check at step 232 is that the call connection data is not present, the IP sharer 20 proceeds to step 238 to check whether the terminal that transmitted the data packet is a local terminal. This can be checked on the source IP. If the inspection result indicates that the terminal is the global terminal 50, the process proceeds to step 240, and the data packet received from the global terminal 50 is transmitted to the internal terminal 10. In such a case, the IP sharer 20 receives the data packet. The IP and port of the local terminal corresponding to the IP and port may be searched from the hash table (that is, demasqueraded) and transmitted to the inside.
[0030]
If the terminal that transmitted the table packet in step 238 is the local terminal 10, the IP sharing device 20 transmits the H.264 packet. For 245 processing, an IP and a port that have already been masqueraded are searched for, de-masqueraded (step 242), and then transmitted internally (step 244). This will be described in more detail with reference to FIG. 4. When the IP sharer 20 transmits the source IP 192.168.0.100, the source port 1001, the destination IP 61.251.85.138, the destination Assuming that a data packet having a local port 60001 is received and that the port 1002 is masqueraded to 60001 by the masquerading operation of the IP sharing device 20, the source IP of the IP sharing device 20 is 61.251.85.138 and the source is The port is 60002, the destination IP is 192.168.0.101, the destination port is masqueraded to 1002, and transmitted to the local terminal n. Such H. The H.225 protocol is described in H.264. Since the port is exchanged with the IP for the H.245 processing, the source IP 192.168.0.100 in the data is also changed to the global IP 61.251.85.138 of the IP sharing device 20. In such a case, since the data packet must be transmitted to the IP sharer 20 again to perform the de-masquerading operation, there is a delay in data processing. Therefore, in the present invention, H. During the process of the H.225 protocol (during the process {circle around (2)} in FIG. The H.245 processing IP (61.251.85.138) and the port are de-masqueraded to the original source-side IP (192.168.0.100) and the port, so that direct communication between the local terminals is possible thereafter. Is performed, communication delay due to masquerade / de-masquerade by the IP sharing device 20 can be prevented.
[0031]
As described above, when the IP sharing device 20 according to the embodiment of the present invention is designated as a destination and receives a data packet from a global or local terminal, the IP sharing device 20 uses the already masqueraded hash table. By de-masquerading the IP and the port and transmitting it to the internal terminal, an Internet call can be normally established between the local terminal and the global terminal by sharing the global IP. In addition, the IP sharing device 20 has an H.264 for interconnection between local terminals. H.225 protocol processing. By de-masquerading the masqueraded IP and port for H.245 processing, H.245 communication between local terminals can occur. Data communication for H.245 processing is performed.
[0032]
[The invention's effect]
As described above, since the present invention is provided with an address (IP) and port conversion function for a protocol higher than the TCP / IP level, a local terminal having a local IP can share one global IP to make an Internet call. It has the advantage of being able to carry out.
[0033]
Also, the present invention reduces the number of data that must be processed for performing an Internet call when an Internet call is made between local terminals, and reduces the load of hardware load processing for sharing a global IP. There is an advantage that a quick Internet call can be made, as well as being reduced.
[0034]
Meanwhile, the present invention has been described with reference to the embodiments illustrated in the drawings. However, this is merely an example, and a person having ordinary knowledge in the art may have a wider variety of embodiments. It will be appreciated that variations and equivalent alternatives are possible. Therefore, the true scope of the present invention should be determined only by the attached claims.
[Brief description of the drawings]
FIG. 1 is an exemplary diagram of a system configuration according to an embodiment of the present invention.
FIG. 2 is a flowchart of a data packet process in the IP sharing device 20 according to an embodiment of the present invention.
FIG. 3 is a flowchart of a data packet process in the IP sharing device 20 according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a process of transmitting data between local terminals according to an embodiment of the present invention.

Claims (3)

In a global IP sharing method in which each local terminal shares a global IP and enables Internet communication with another local terminal or a global terminal,
Receiving a data packet from a local terminal;
If the received data packet is gatekeeper registration request data, Detecting the IP and port information for the H.225 processing, masquerading the global IP allocated to itself and an arbitrarily generated port, and storing them;
The received data packet is H.264. 225 processing data, Detecting IP and port information for H.245 communication, and masquerading and storing the global IP allocated to itself and an arbitrarily generated port;
The received data packet is H.264. If it is H.245 processing data, detecting IP and port information for voice / image / data communication, masquerading the global IP allocated to itself and an arbitrarily generated port, and storing the masqueraded data;
Transmitting the received data packet to the outside;
De-masquerading IP and port information detected from an externally received data packet and transmitting the information to a corresponding local terminal. The data packet received in response to the external transmission of the received data packet includes call connection data. Detecting and registering IP and port information for H.245 communication;
The local terminal having the registered port information is sent to the local terminal. And transmitting the H.245 communication data. 2. The method as claimed in claim 1, further comprising transmitting 245 communication data. The received data packet is transmitted to an internal local terminal according to H.264 for interconnection. H.225 including H.225 processing data and H.225 for interconnection with an internal local terminal. 225, when receiving the processed data, if the destination port is a masqueraded port, demasquerading the source IP and port to the IP and port of the calling local terminal and transmitting it to the called local terminal. The global IP sharing method according to claim 1 or 2, wherein:

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