KR20040085549A - GATEWAY FOR VoIP - Google Patents

Abstract

PURPOSE: A VoIP gateway device is provided to directly connect an extension line to each gateway card, and to process inner calls between the gateway cards while processing calls with an external network through a proxy card, thereby supplying a high-capacity gateway device without interworking with a PBX. CONSTITUTION: More than one gateway card(320) has ports accessible to house phones, selectively connects the house phones to an accessible Ethernet network or PSTN to form a voice call channel. A proxy card(310) searches ID information of a receiving gateway card to be connected from information on a callee which is transmitted from an originating gateway card, mediates a call connection between the originating gateway card and the receiving gateway card, converts a private IP of an inner gateway card into a real IP to form a voice call channel between an outer IP network and the inner gateway card, and performs packet transmission with the outer IP network.

Description

V.IP gateway device {GATEWAY FOR VoIP}

The present invention relates to a VoIP gateway, and more particularly, to a VoIP gateway device capable of making a VoIP call by connecting an internal telephone within an enterprise or an apartment house to an IP network without interworking with a PBX.

With the rapid development of the underlying network technology supporting the Internet and the worldwide spread of the internet network, there is a condition for transmitting and receiving not only text data but also various multimedia data at a relatively low cost among remote users.

Taking advantage of these advantages, it is the Voice Over Internet Protocol (VoIP) that enables voice communication between users over the Internet. In other words, VoIP can be regarded as a network that provides an underlying protocol and infrastructure for transmitting and receiving voice data in an IP network.

On the other hand, since the charge for the call service using the IP network is relatively inexpensive, the use of VoIP calls in the case of expensive calls such as international calls is expected to reduce the cost, so the use thereof is expected to increase gradually.

However, since VoIP technology is not mature enough to replace the wide range of telephone services provided by existing PSTN networks, it is still operating by interworking PSTN networks and VoIP networks in corporations or large apartment houses (APTs). It is common. In order to interwork the PSTN and VoIP, as shown in FIG. 1, a gateway for converting different call control protocols, voice control protocols, and compression protocols to each network is required.

Referring to FIG. 1, which shows a network diagram for explaining a general VoIP gateway, the internal telephone wiring in an apartment (or company) is physically connected to a private branch exchange (PBX) 200. The branch exchange 200 is connected to the gateway 100 and the public switched telephone network (PSTN). The general gateway 100 does not provide an interface to connect a plurality of general extension phones due to the price. Therefore, in order to build a VoIP network, there is a disadvantage in that a system is provided with a separate PBX 200 between the premises line and the gateway 100. In addition, when implementing the model proposed in the present invention by configuring only the current gateway alone, it is economically burdensome when developing a large capacity of the gateway and a separate design for supporting a large telephone line that is not trunk based. There are disadvantages, and the manufacturer has to maintain a variety of different product line, which is accompanied by maintenance difficulties.

Furthermore, since the general gateway is made of one large-capacity gateway, there is a disadvantage in that the gateway is totally down when a failure occurs.

Therefore, an object of the present invention is to provide a VoIP gateway device that can be directly connected to a plurality of phones in the company or apartment house to provide VoIP call service without interworking with the PBX,

In addition, an object of the present invention is to provide a VoIP gateway device that can conveniently change the capacity in accordance with the addition and subtraction of the telephone line,

Furthermore, the present invention provides a VoIP gateway device that can prevent the entire system from being down due to a failure, thereby increasing the use efficiency of the system.

1 is an exemplary network configuration for explaining a general VoIP gateway.

2 is a network diagram illustrating a VoIP gateway device according to an embodiment of the present invention.

3 is a configuration diagram of the VoIP gateway device 300 shown in FIG.

4 is a configuration example of the gateway card 320 shown in FIG.

5 is an exemplary configuration diagram of the VoIP proxy card 310 shown in FIG. 3.

6 is an exemplary message sequence chart when performing an external call in a VoIP network according to an embodiment of the present invention.

7 is an exemplary message sequence chart in the case of making an internal call in a VoIP network according to an embodiment of the present invention.

VoIP gateway device according to an embodiment of the present invention for achieving the above object,

At least one small capacity gateway card having ports connectable to the local telephone and configured to selectively connect the local telephone connected to each port to a connectable Ethernet network or a public telephone network to form a voice call channel;

From among the gateway cards, the identification information of the receiving gateway card to be connected is found from the called party information transmitted from the calling gateway card that has requested the internal call processing, and the call gateway is arbitrated between the calling gateway card and the receiving gateway card. And a proxy card that converts the private IP of the corresponding gateway card into a real IP to form a voice call channel between the IP network and the internal gateway card and transmits a packet to the external IP network.

Therefore, the gateway device according to the embodiment of the present invention can prevent the entire system from going down because each card can be operated independently even if a part of the gateway card occurs, it is possible to add or subtract the gateway card according to the capacity of the internal network. In addition, the capacity of the gateway can be easily adjusted, and the maintenance is not necessary because there is no need to maintain a variety of different products according to the capacity.

On the other hand, the proxy card of the present invention,

A memory in which an extension number and a trunk line number of an extension telephone connected to each port of the gateway card are registered;

A main controller configured to control call processing so that a voice call channel is formed between internal gateway cards or between internal gateway cards and an external IP network based on the information registered in the memory;

By including the Ethernet interface and the IP network interface unit, the call processing in the internal network as well as the normal voice call processing between the heterogeneous network can be made.

For reference, the main controller includes a RAS proxy module for processing a UDP based H.225 RAS message, a signaling proxy module for processing a TCP based H.225 signaling message, and a UDP based RTP / RTCP packet transmission. Call processing control based on the RTP proxy module for processing the.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

First, FIG. 2 illustrates a network configuration diagram for describing a VoIP gateway device 300 according to an embodiment of the present invention. FIG. 3 illustrates a detailed configuration diagram of the VoIP gateway device 300 shown in FIG. 4 and 5 illustrate the configuration of the gateway card 320 and the VoIP proxy card 310 shown in FIG.

2, the VoIP gateway device 300 according to an embodiment of the present invention is located at the interface of a heterogeneous network, i.e., an IP network and an internal telephone network, so that a voice call is normally performed between heterogeneous communication networks using different protocols. It converts protocols. As shown in FIG. 2, the VoIP gateway device 300 according to an exemplary embodiment of the present invention, unlike a general gateway, is directly connected to a plurality of premises telephone wiring lines to support VoIP voice calls, and when an IP network occurs, the premises telephone It is also physically connected to a backup public telephone network (PSTN) to provide normal voice call service to subscribers. If the configuration of the VoIP gateway device 300 will be described in more detail with reference to FIG.

First, the VoIP gateway device 300 according to the embodiment of the present invention includes a plurality of gateway cards 320 connected to Ethernet as shown in FIG. 3, and a VoIP proxy card 310 connected to the Ethernet network.

The small-capacity gateway card 320 includes a plurality of ports that can be connected to an extension telephone (premises telephone wiring), and selects and connects the extension telephone connected to each port to an Ethernet network or a public telephone network (PSTN) to establish a voice call channel. It plays a role of forming. The gateway card 320 is configured as shown in FIG. 4, and the number of cards may vary according to the capacity of the internal network. Unexplained reference numerals 1 to 3 connected to the gateway card 320 indicate the PSTN.

Hereinafter, the configuration of the gateway card 320 will be described with reference to FIG. 4. First, each gateway card 320 includes a subscriber line connection unit 321 connected to a general subscriber station which is a local telephone. This subscriber line connection 321 may consist of multiple ports. In addition, the gateway card 320 includes a switching unit 322 for connecting subscribers connected through a line, and further includes a media processing unit 325 for compressing and restoring general voice. In addition, the gateway card 320 further includes an analog relay line connection unit 326 for connection with a public telephone network for backup purposes in order to prevent voice calls due to an IP network failure. Network connection 324 is further configured.

Finally, the gateway card 320 includes a main control unit 323 for controlling voice call channel formation between subscribers in the premises or with external subscribers. The main controller 323 includes a memory in which a program module for controlling voice call channel formation is registered. The program module includes a RAS channel module for processing a UDP-based H.225 RAS message, a signaling channel module for processing a TCP-based H.225 signaling message, and an RTP for processing a UDP-based RTP / RTCP packet transmission. It includes a channel module.

On the other hand, the VoIP proxy card 310 searches for the identification information of the receiving gateway card to be connected from the called party information transmitted from the calling gateway card which requested the internal call processing among the gateway cards 320 connected to the Ethernet network. It negotiates the call connection between the gateway card and the receiving gateway card. That is, the VoIP proxy card 310 according to an embodiment of the present invention serves as a gatekeeper when requesting a call in the internal network. In addition, the VoIP proxy card 310 converts the private IP of the corresponding gateway card into a real IP to form a voice call channel between the external IP network and the internal gateway card, and performs packet transmission with the external IP network. do. That is, the VoIP proxy card 310 converts a private IP of the corresponding gateway card 320 into a real IP when relaying a call with an outside party. The VoIP proxy card 310 may be configurable in parallel for the stability of the system.

Hereinafter, the detailed configuration of the above-described VoIP proxy card 310 will be described with reference to FIG. 5. First, the VoIP proxy card 310 according to an embodiment of the present invention is connected to each of the ports of each gateway card 320 connected by Ethernet. And a memory 312 in which the extension number and the trunk line number of the telephone extension are registered. The extension number is for connection to the extension telephone and the trunk line number is for answering a call from an external IP network. That is, the VoIP card 310 can obtain the receiver location information in the premises network by pre-registering the extension number and the trunk line number of the premises telephone connected to the gateway card 320. Of course, it is assumed that the virtual private IP is assigned to each gateway card 320 in advance.

Meanwhile, the VoIP proxy card 310 includes interface units 314 and 316 for transmitting and receiving information with each of the internal Ethernet network and the external IP network. And a main controller 317 for controlling call processing so that a voice call channel is formed between the internal gateway card 320 or between the internal gateway card 320 and the external IP network based on the information registered in the memory 312. It includes more. The internal memory of the main controller 317 includes a RAS proxy module for processing a UDP-based H.225 RAS message, a signaling proxy module for processing a TCP-based H.225 signaling message, and a UDP-based RTP / RTCP. A program module including an RTP proxy module for processing packet transmission is registered. The main controller 317 can control the call processing between each gateway card 320 and the external network based on the H.323 protocol.

Hereinafter, a process of making an external call and an internal call through the VoIP gateway device 300 having the above-described configuration will be described in more detail.

FIG. 6 illustrates a message sequence chart when an external call is performed in a VoIP network according to an embodiment of the present invention. More specifically, a subscriber in an apartment (APT) sends an external call to VoIP. An example of a call is shown.

Referring to FIG. 6, in order to establish a call path between an external network (IP network) and a specific subscriber of an internal network, location information of subscribers should be registered in the VoIP proxy card 310. Such registration may be pre-registered by an administrator or the like at the time of login or system construction of each gateway card 320. According to an embodiment of the present invention, information (location information and identification information) of an extension telephone connected to the ports of each card 320 from each gateway card 320 to which the VoIP proxy card 310 is logged in (step 400) is obtained. It is assumed that the input is registered. For reference, the location information of the premises telephone is information that can be used to detect which gateway card 320 the premises telephone is connected to, and the identification information of the premises telephone is connected to which port on the gateway card 320. It can be said that it can be used for detecting whether it is done. Information registration of such extension telephones is performed through H.225 RAS signaling between each gateway card 320 and the VoIP proxy card 310.

As described above, when the location information and the identification information of the local telephone are registered in the memory of the VoIP proxy card 310 through the login of each gateway card 320, the VoIP call with the external network may be performed through the following process. .

First, when the subscriber inputs the number of the called party to be called with his terminal (step 402), the gateway card 320, which has received the called party number, responds to the VoIP proxy card 310 with caller information (caller number, gateway). A network use request message ARQ (Admission Request) including a card H.323 ID, a gateway IP virtual IP address), and a caller identification number is transmitted (step 404). The proxy card 310 also sends to the IP Telephony Service Provider (TSP) an ARQ request message containing caller information (caller number, proxy card H.323 ID, address on the proxy card's real IP), and caller identification number. In step 406, the IP TSP responds to the network request message (ARQ). The IP TSP includes a recipient information (real IP address) and a real recipient ID number. Is transmitted to the proxy card 310 (step 408). Then, through the proxy card 310, the gateway card 320, which has received the network usage approval message (ACF) including the called party's called party number, sends the caller's information (caller number, gateway card H.323 ID, gateway card). A Q.931 setup message including a private IP address) and a called number is transmitted to the proxy card 310 (step 412) to request a call connection.

In response to the call connection request, the proxy card 310 also transmits the Q.931 setup message including the caller's information (caller number, proxy card H.323 ID, proxy card's real IP address) and called party number to the IP TSP ( In step 414, the ring signal is transmitted to the called party's terminal having the input telephone number, and the call processing message 416 and the call response waiting message 418 are sequentially transmitted from the IP TSP to the gateway card 320. The call connection (step 422) is normally performed between the calling party and the called party through the transmission of such a message.

Therefore, a normal call can be made between the user of the premises telephone located in the premises and the called party existing in the external IP network.

Meanwhile, FIG. 7 illustrates a message sequence chart in the case of performing an internal call in a VoIP network according to an exemplary embodiment of the present invention.

Referring to FIG. 7, first, location information of subscribers must also be registered in the VoIP proxy card 310 in order to make a call between internal subscribers. Such registration may be performed at the login of each gateway card 320 as described in FIG.

When the location information and the identification information of the extension telephone are registered in the memory of the VoIP proxy card 310 through the login of each gateway card 320 (step 500), the internal telephone call is performed in the internal network through the following process.

First, when the subscriber enters the extension number (which may be the trunk line number) of the called party who wants to carry his / her own terminal (step 502), the calling gateway card 320, which has received the called extension number, responds to the caller. Network request message ARQ (Admission Request) including information of caller's number, calling gateway card H.323 ID, calling gateway card's private IP address) and called party's number is transmitted to proxy card through Ethernet network. Step 504).

The VoIP proxy card 310 then transmits the information (caller number, calling gateway card H.323 ID, private IP address of the calling gateway card) of the calling gateway card 320 as the calling party and the information of the proxy card itself as the calling party. A network use approval message ACF (Admission Confirmation) including (the actual called number and the private IP address of the proxy card) is transmitted to the calling gateway card 320 (step 506). Then, the calling gateway card 320, which has received the network use approval message (ACF) from the proxy card 310, sends the caller's information (caller number, calling gateway card H.323 ID, and private IP address of the calling gateway card). And a Q.931 setup message including the called party number to the proxy card 310 (step 508) to request a call connection.

As such, when there is an internal call connection request, the VoIP proxy card 310 transmits the caller's information and the called number to the gateway card, that is, the gateway card 320 to which the local telephone having the extension number of the called party is connected. In step 510, a Q.931 setup message including a Call ID is transmitted. The receiving gateway card 320 then responds to the receiving gateway card 320 in response to the receiving party's information (caller number, calling gateway card H.323 ID, IP address of the calling gateway card), and the called party's number. The use request message ARQ is transmitted to the proxy card 310 (step 512). In response to receiving the ARQ message, the proxy card 310 transmits a network use approval message ACF to the receiving gateway card 320 (step 514). The receiving gateway card 320 responds to receiving the setup message. The call processing message 516 and the call response waiting message (Alert) 418 are generated in order and transmitted to the calling gateway card 320 via the proxy card 310. When the receiving subscriber responds to the call through the transmission of the message, a call connection (step 522) is normally performed between the caller as the caller and the called party as the receiver.

Therefore, a normal call is made between users of the telephones located in the premises.

As described above, the present invention provides a separate branch office switch (PBX) by directly connecting an internal telephone line to each gateway card and performing a call processing connection between an internal network and an external network between each gateway card through a proxy card. ) There is an advantage that can provide a large capacity gateway device without interworking.

In addition, the present invention can increase and decrease the small-capacity gateway card in accordance with the increase and decrease of the telephone line, there is an advantage to build a gateway system for the purpose of use at a low cost, and to maintain various types of gateway devices developed separately There is an advantage that does not need to.

Furthermore, the present invention has an advantage of guaranteeing the reliability of the system because each gateway card operates independently, even if a failure occurs in any one of the gateway cards.

Claims (4)

In the VoIP gateway device, At least one small capacity gateway card having ports connectable to the local telephone and configured to selectively connect the local telephone connected to each port to a connectable Ethernet network or a public telephone network to form a voice call channel; From among the gateway cards, the identification information of the receiving gateway card to be connected is found from the called party information transmitted from the calling gateway card that has requested the internal call processing, and the call gateway is arbitrated between the calling gateway card and the receiving gateway card. And a proxy card for converting a private IP of the corresponding gateway card into a real IP to transmit a packet to the external IP network to form a voice call channel between the IP network and the internal gateway card. . The VoIP gateway device according to claim 1, further comprising a proxy card identical to the proxy card between the Ethernet network and the IP network for stability stock. The method of claim 1 or 2, wherein the proxy card; A memory in which an extension number and a trunk line number of an extension telephone connected to each port of the gateway card are registered; A main controller configured to control call processing so that a voice call channel is formed between internal gateway cards or between an internal gateway card and an external IP network based on the information registered in the memory; And the Ethernet interface and the IP network interface unit. The method of claim 3, wherein the main controller; A RAS proxy module for processing UDP-based H.225 RAS messages; A signaling proxy module for processing a TCP based H.225 signaling message; And an RTP proxy module for processing UDP-based RTP / RTCP packet transmissions.