KR20040083315A - IP router supporting VoIP service and calling method using thereof - Google Patents

Abstract

PURPOSE: An IP sharing unit supporting a VoIP(Voice over Internet Protocol) service and a call method using the same are provided to allow a user to make a VoIP phone call by using a terminal connected to an IP sharing unit. CONSTITUTION: A storing unit(240) stores an authorized IP address, a proxy IP address, a private IP address and port information, portion number information and information on private IP address allocated to terminals connected to an internal network. An internal network interface unit(220) is physically connected with a user terminal connected to the internal network and enables data communication. An external network interface unit(230) makes data communication with a gatekeeper, a gateway or a VoIP server physically connected through an Internet line. A control module includes an NAT(Network Address Translation) module(210-1), a proxy module(210-2) and a packet inspection module(210-3).

Description

IP router supporting VoIP service and calling method using

The present invention relates to an IP router and a voice over internet protocol (VoIP) call method using the same. In particular, an IP router for supporting a VoIP service that enables a VoIP call to a terminal connected to the IP router and assigned a private IP address, and the same It relates to the currency method used.

All host computers currently connected to the Internet use a unique IP address assigned to them by a recognized authority to mutually identify each host computer within the Internet.

The IP address consists of four bytes. Due to the proliferation of the Internet, it has become difficult to assign a unique IP address to every terminal that accesses the Internet.

To solve these problems, private networks built by companies or organizations use internally defined private IP addresses, and mapping so that authorized IP addresses can be used only for data sent to and received from the external Internet. This method saves the necessary IP address. This is the NAT (Network Address Translation) function used in the IP router.

As Internet technology has developed, various services using the Internet have been developed. One of them is VoIP service using the H.323 standard.

However, according to the related art, only a terminal assigned a public IP address can use a VoIP service, and a terminal assigned a private IP address cannot use a VoIP service due to the characteristics of the H.323 standard.

That is, in the H.323 protocol, a packet transmitted to an H.323 gatekeeper or an H.323 gateway during a handshake for call setup does not include the IP address of the user terminal only in the IP header. The IP address of the user terminal is also included in the 323 packet. However, the conventional IP router converts only the source IP address in the IP header into a public IP address, and the source IP address in the H.323 packet is transmitted to the external network without any change, so that the H.323 gatekeeper or H. Since the 323 gateway cannot perform proper call setup, terminals connected to the IP router cannot receive VoIP service.

The technical problem to be achieved by the present invention is to provide a H.323 relay service to the IP router in order to solve the above-mentioned problems IP router supporting the VoIP service to receive the VoIP service to the terminal connected to the internal network and using the same To provide a call method.

1 is a block diagram of a VoIP call system to which an IP router supporting a VoIP service according to the present invention is applied.

2 is a detailed configuration diagram of an IP router supporting a VoIP service according to the present invention.

3 is a flowchart illustrating a VoIP call method using an IP router supporting a VoIP service according to the present invention.

4 is a block diagram of call connection request packet data converted by the IP router according to the present invention.

In order to achieve the above technical problem, the IP router supporting the VoIP service according to the present invention includes a storage means for storing a public IP address, a proxy IP address, a private IP address and port information in an IP router, and a user terminal in an internal network. An internal network interface unit for physically connected to perform data communication, an external network interface unit for physically connecting to a terminal to an external network for performing data communication, and included in an IP header using IP information stored in the storage means. A network address translation control of the IP address is executed, and when the VoIP service request information is received, a call including the proxy IP address in the source IP address in the packet by reading the proxy IP address and the assigned port number information stored in the storage means. Send setup message to target IP address, call setup It characterized in that it comprises a control module for controlling to execute the call data relay between the user terminal and the port number assigned to the called terminal.

In order to achieve the above technical problem, a call method using an IP router supporting a VoIP service according to the present invention is a VoIP call method in an IP router, comprising: (a) Call connection request packet data from a user terminal included in an internal network; (B) when call connection request packet data is transmitted, as a result of the determination of step (a), proxy IP address of the IP router and port number information allocated to the IP router. (C) transmitting call connection request packet data including the proxy IP address and the assigned port number information of the IP router to a VoIP server and attempting to set up a call with the inserted proxy IP address; and (d ) After confirming the call connection from the VoIP server, using the proxy IP address and the assigned port number information as the source IP information, Characterized in that a comprises a step of executing.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the VoIP call system to which the IP router according to the present invention is applied includes the Internet 1000, a general public switched network (PSTN) 2000, a mobile communication network 3000, an IP router 110, and a gatekeeper ( 120, the gateway 130, the VoIP server 140, the user terminal 150 connected to the internal network of the IP sharer 110, the telephone 160 connected to the PSTN 2000, and the mobile communication network 3000. Consisting of a mobile phone 170.

The gateway 130 includes voice control, DTMF reception, DTMF tone generation, and the like, to enable voice telephone calls between the Internet 1000, the PSTN 2000, and the mobile communication network 3000 having different standards. This function converts the signal specification.

The gatekeeper 120 is one of the H.323 entities defined in the H.323 protocol, which is a multimedia communication standard of ITU-T (International Telecommunication Union-Telecommunication), and is a packet-based network (IP-based). Endpoints (eg, gateways, terminals, multi-point control units (MCUs)) existing in the network are a means of grouping, controlling and registering a control area defined as a zone.

In general, the gatekeeper 130 has a function of controlling a network, performs an authentication operation for determining whether to permit an incoming call from the outside, and executes a control for a bandwidth change request. In addition, conversion between the telephone number and the IP address of the Internet phone is performed using the conversion table already registered. If you are using a static IP address, the IP address that matches the Internet phone number in the conversion table is fixed.However, if you are using a dynamic IP, such as ADSL or cable modem, you may need to set up a regular connection between your internet phone and your gatekeeper. Through the exchange of personal information, it always checks and stores the changed IP address that matches the subscriber ID (the phone number of the Internet phone, H.323ID and e164ID), and checks the IP address that matches the incoming Internet phone number to make an Internet phone phone call. It is possible to support.

The VoIP server 140 provides application software necessary for an internet phone call to the user terminal 150, and manages an internet call for opening and controlling a call channel by identifying a gateway or gatekeeper of a region to which a receiver terminal to be called belongs. Play the role of the center. That is, in response to the call connection request of the user terminal transmitted through the H.323 relay of the IP router 110, the IP router 110 is transmitted through the call connection setup message to the gateway or the gatekeeper to which the receiver terminal belongs. Thus, a communication channel is opened between the user terminal and the receiver terminal.

The terminal 150 connected to the internal network of the IP sharer 110 is composed of a personal computer, an IP phone, or the like. When the terminal is configured as an IP phone, the terminal includes a VoIP module to enable an internet phone call service. In the present invention, a single terminal 150 is shown in the internal network for convenience of description, but in practice, a plurality of terminals are connected.

2 is a detailed block diagram of the IP router 110 supporting the VoIP service according to the present invention.

As shown in FIG. 2, the IP router 110 supporting the VoIP service according to the present invention includes a control module 210, an internal network interface unit 220, an external network interface unit 230, and a storage unit 240. It includes.

The storage means 240 stores public IP addresses, proxy IP addresses, private IP addresses, and port information, and also stores private IP addresses and port number information allocated to terminals connected to the internal network. In particular, when the connected terminal requests VoIP service, it stores the proxy IP address assigned to the public IP address in addition to the private IP address and port number assigned to the terminal.

The internal network interface 220 is physically connected to the user terminal 150 connected to the internal network, which is a local area network (LAN) such as Ethernet, to enable data communication.

The external network interface unit 230 enables data communication with terminals such as the gatekeeper 120, the gateway 130, or the VoIP server 140 that are physically connected through the Internet 1000 line.

In detail, the control module 210 includes a NAT module 210-1, a proxy module 210-2, and a packet inspection module 210-3.

The NAT module 210-1 executes a function of translating network addresses. That is, when an IP address is requested from a terminal connected to the internal network, an unassigned private IP address and a port number stored in the storage unit 240 are retrieved and assigned to the terminal, and the IP header is transmitted when transmitting data to the external network. It converts my source IP address (private IP address) to a public IP address and sends it. When receiving data, it searches for a port number and sends it to a terminal with a private IP address connected to the corresponding port.

The packet inspecting module 210-3 is a module for monitoring whether a received packet is a VoIP service request packet. That is, it determines whether the received data is VoIP packet data according to the H.323 standard.

The proxy module 210-2 is a proxy IP address stored in the storage means 240 when the data received as a result of packet inspection by the packet inspection module 210-3 is VoIP packet data according to the H.323 standard. IP router specific IP address) assigned to the address is inserted into the source IP address of the call connection request packet data according to the H.323 standard, and then transmitted to the VoIP server 140 to request call setup with the inserted proxy IP address. . The converted call connection request packet data transmitted from the proxy module 210-2 to the VoIP server 140 is as shown in FIG. 4.

That is, the converted call connection request packet data includes source IP information (IP address and port number of the sending terminal), destination IP information (IP address and port number of the VoIP server), recipient phone number information, and proxy IP address information. It is included. Here, the proxy IP address information is information inserted in the proxy module 210-2.

Next, an operation of executing a VoIP call by using the H.323 VoIP packet relay function of the IP router 110 in the user terminal 150 will be described in detail with reference to the flowchart of FIG. 3.

First, when the user terminal 150 is connected to the internal network, a private IP address and a port number are allocated from the IP router 110 (S1 and S2).

After the user terminal 150 completes the process necessary for accessing the Internet, when the user attempts to make a call to provide a VoIP call service, the source IP information (IP address and port number of the transmitting terminal) and the destination IP information (VoIP server) IP packet and port number) and the packet data requesting the call connection including the receiver phone number information is transmitted to the IP router 110 (S3).

Then, since the packet received as a result of packet inspection by the packet inspection module 210-3 of the IP router 110 corresponds to call connection request data by the H.323 packet, the proxy module 210-2 receives a source in the received packet. The proxy IP information is inserted into the IP address, and the converted call connection request packet data as shown in FIG. 4 is transmitted to the VoIP server 140 as the destination address (S4).

When the received packet includes proxy IP address information, the VoIP server 140 recognizes the call relaying through the proxy IP address. In addition, the VoIP server 140 transmits a call connection setup message to the gatekeeper (or gateway) to which the receiver terminal (or telephone) belongs using the H.323 standard to call the terminal (or telephone) corresponding to the receiver telephone number. do. At this time, in response to the call request of the proxy relay method, a proxy address is included in the setup message instead of the IP address of the user terminal and transmitted (S5). That is, when the receiver phone number corresponds to the IP phone number, the receiver transmits the gatekeeper 120 to the destination jurisdiction, and when the receiver phone number corresponds to the general telephone number or the mobile phone number, the receiver telephone number is transmitted to the destination jurisdiction gateway 130. do.

The gatekeeper 120 or the gateway 130 receiving the setup message including the proxy IP address is connected to the receiver terminal (IP phone, landline phone or mobile phone) via the Internet 1000 or the PSTN 2000 or the mobile communication network 3000. The call is transmitted to the VoIP server 140 informing that the call is connected, if there is a response from the receiver (S6).

Then, the VoIP server 140 transmits a confirmation message indicating that the call is connected to the IP sharer 110 having a proxy IP address (S7), and the IP sharer 110 corresponds to a private IP corresponding to the port number of the terminal requesting the call connection. Relay transmission to the user terminal 150 having the address (S8). Accordingly, the call can be connected through the proxy IP address.

When the call is connected, the IP router 110 operates as a proxy server for relaying H.323 packet data between the transmitting and receiving terminals. That is, when the transmitted voice data packet is transmitted from the user terminal 150 to the IP router 110 (S9), the IP router 110 transmits the proxy IP to the source IP address to the gatekeeper 120 or the gateway 130 connected to the call. Insert the address to relay transmission (S10). In addition, when a sign language voice data packet of a receiver terminal (telephone) is transmitted to the IP sharer 110 which is a proxy IP address (S11), the call is relayed to a user terminal having a private IP address connected to a port number connected to the call (S12).

In this manner, the user terminal 150, which is connected to the internal network of the IP sharer 110 and is assigned a private IP address, can perform a VoIP telephone call.

The invention can be practiced as a method, apparatus, system, or the like. When implemented in software, the constituent means of the present invention are code segments that necessarily perform the necessary work. The program or code segments may be stored in a processor readable medium or transmitted by a computer data signal coupled with a carrier on a transmission medium or network. Processor readable media includes any medium that can store or transmit information. Examples of processor-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROM (EROM), floppy disks, optical disks, hard disks, optical fiber media, radio frequency (RF) networks, Etc. Computer data signals include any signal that can propagate over transmission media such as electronic network channels, optical fibers, air, electromagnetic fields, RF networks, and the like.

Specific embodiments shown in the accompanying drawings are to be understood only as examples of the present invention, and are not intended to limit the scope of the present invention, but also various technical scope described in the present invention in the technical field to which the present invention belongs. It is obvious that the invention is not limited to the specific configurations and arrangements shown or described, as other changes may occur.

As described above, according to the present invention, by controlling the IP router to enable H.323 VoIP relay service through the proxy IP address, the VoIP phone call can be executed even by using a terminal connected to the IP router. Is generated.

Claims (7)

In the IP router, Storage means for storing public IP address, proxy IP address, private IP address and port information; An internal network interface unit physically connected to a user terminal in an internal network to perform data communication; An external network interface unit physically connected to the external network to perform data communication; And The network address translation control of the IP address included in the IP header is executed using the IP information stored in the storage means. When the VoIP service request information is received, the proxy IP address and the assigned port number information stored in the storage means are received. A control module that reads and transmits a call setup message including a proxy IP address in a source IP address in a packet to a target IP address, and performs call data relay between a user terminal and a receiver terminal at the assigned port number after call setup. IP router that supports VoIP service, characterized in that it includes. The IP router of claim 1, wherein the VoIP service request information is call connection request data based on an H.323 standard. The method of claim 1, wherein the control module A NAT module for allocating a private IP address and a port number to a terminal connected to the internal network, and converting a source IP address included in an IP header into a public IP address during data communication with the external network; A packet inspection module for determining whether a packet received from an internal network is an H.323 packet; And If the data received as a result of packet inspection by the packet inspection module is VoIP packet data according to the H.323 standard, a proxy IP address is inserted into a source IP address and transmitted to an external network.After a call connection, the proxy is connected between connected terminals. IP router that supports the VoIP service, characterized in that it comprises a proxy module for relaying the VoIP packet via the IP address. The IP router of claim 3, wherein the proxy IP address is a unique IP address of an IP router assigned as a public IP address. In the VoIP call method in the IP router, (a) determining whether call connection request packet data is transmitted from a user terminal included in an internal network; (b) inserting proxy IP address and assigned port number information of the IP router into the transmitted call connection request packet data when the determination result of the step (a) is transmitted; (c) transmitting call connection request packet data including the proxy IP address and the assigned port number information of the IP router to the VoIP server and attempting to set up the call with the inserted proxy IP address; And (d) performing call data relay using the proxy IP address and the assigned port number information as source IP information after confirming the call connection from the VoIP server. Call way. 6. The method of claim 5, wherein the call connection request packet data is call connection request data according to the H.323 standard. The method of claim 5, wherein the proxy IP address is an IP router unique IP address assigned as a public IP address.