KR100799478B1 - VIDEO ADAPTER APPARATUS FOR VoIP SYSTEM AND METHOD FOR PROVIDING VIDEO TELEPHONE SERVICE USING THEREOF - Google Patents

Abstract

The present invention relates to a video adapter device for providing a video call in a VoIP system capable of only a voice call and a video call service method using the same. The present invention provides a voice call through a VoIP system by receiving a voice signal and a telephone signal from a general telephone. A general telephone processor, a network processor providing a network environment with a VoIP system, a video processor for providing video information for a video call service when a user requests a video call, and a DTMF for generating a DTMF signal for a predetermined video call connection A signal generator, an IP / port number acquisition unit for acquiring a port number for transmitting and receiving public IP and video data to which a video adapter device is connected, and the overall operation of the video adapter device to control the voice call or video call. It is configured to include a central control unit.

VoIP, voice call, video call, video adapter, DTMF

Description

Video adapter device for video system and method of providing video call service using same {VIDEO ADAPTER APPARATUS FOR VoIP SYSTEM AND METHOD FOR PROVIDING VIDEO TELEPHONE SERVICE USING THEREOF}

1 is a connection configuration diagram of a video adapter device for VoIP according to the present invention.

2 is an internal configuration diagram of a video adapter device for VoIP according to the present invention.

3 is a configuration diagram of a VoIP service including a video adapter device for a VoIP system according to the present invention.

4A and 4B are flowcharts illustrating a video call service method using a video adapter device for a VoIP system according to the present invention.

5 is a flowchart illustrating a method of ending a video call in a video call service according to the present invention.

6 is a block diagram of a typical subscriber-side VoIP system.

7 is a configuration diagram of a general VoIP service.

8 is a flowchart illustrating a method of providing a general VoIP service.

<Description of the symbols for the main parts of the drawings>

V: VoIP System VA: Video Adapter Device

100: general telephone processing unit 200: network processing unit

300: image processing unit 400: DTMF signal generating unit

500: IP / port number acquisition unit 600: key input unit

700: central control unit

The present invention relates to Voice over Internet Protocol (VoIP) technology, and more particularly, to a video adapter device for providing a video call in a VoIP system capable of only a voice call and a video call service method using the same.

VoIP is a technology that converts voice signal into compressed data packet and transmits it through internet network based on IP network. As the internet network is interworked with PSTN network, various types of application services are developed by various VoIP devices. In addition, telephone users have the advantage of being able to receive long-distance and international phone service in the Internet and intranet environment with only local call charges.

6 is a block diagram of a typical subscriber-side VoIP system, the VoIP system (V) is a modem 10 for Internet services, NAT router 20 for building a private IP network, VoIP terminal 30 for voice calls, etc. It consists of.

The VoIP terminal 30 is directly connected to the Internet through a modem 10 or connected to the Internet through a NAT router 20, and basically includes a VoIP protocol such as H.323 and SIP, a voice codec, and the like. Ports (FXS module, RJ45 module, etc.) are provided for telephone or personal PC connection. Accordingly, the VoIP service subscribers can register the IP address and phone number of the VoIP terminal with the soft switch through the Internet network to make a voice call not only with the other party's VoIP terminal but also with a general telephone.

FIG. 7 is a configuration diagram of a general VoIP service, and FIG. 8 is a flowchart illustrating a method of providing a general VoIP service.

Existing VoIP system has a server, such as a soft switch (SS) to provide a VoIP service as shown in FIG. In VoIP services based on the H.323 protocol, a gatekeeper server plays this role. In a VoIP service based on the SIP protocol, a registrar and a proxy server play this role.

7 and 8, the VoIP voice call connection through the VoIP system is performed in the following order.

1-１. The user of the general telephone T1 picks up the handset and presses the other party's number.

1-２. The caller's VoIP system (V1) recognizes the DTMF and requests the soft switch (SS) to connect to the phone number through the VoIP protocol.

1-３. The soft switch (SS) finds the IP of the VoIP system (V2) of the user of the corresponding number among the registered users and delivers a call connection message.

1-4. The called party's VoIP system V2 generates a ring in the general telephone T2.

1-５. The user of the general telephone T2 picks up the handset to receive the call.

1-6. The called party's VoIP system V2 delivers the incoming call message to the caller's VoIP system V1 via the soft switch SS.

1-７. The VoIP system V1 on the caller side is set to a call state.

1-i. The VoIP systems V1 and V2 on both sides enable communication by performing voice transmission and reception through the mutual voice codec.

The disadvantage of the existing VoIP system is that it cannot provide other services than the voice call service provided by ordinary telephones. In other words, in order to provide multimedia services including video calls, functions such as video input / output, video signal processing, video codec, etc. in addition to voice signal processing technology and VoIP protocol processing are required, but existing VoIP systems do not have these functions. .

On the other hand, MoIP system based on MoIP (Multimedia over IP) technology is being developed. MoIP provides video input / output and video transmission / reception functions to existing VoIP system, enabling multimedia service including video call.

However, when replacing an existing VoIP system with a MoIP system has a disadvantage that the replacement cost is considerable, and furthermore, when the modem / router, etc. are integrally configured, there is a disadvantage that the replacement is impossible.

The present invention has been made to solve the above problems of the prior art, an object of the present invention is to enable a multimedia service including a video call with the addition of a minimum of equipment for video calls while maintaining the existing VoIP system configuration .

Another object of the present invention is to connect to a voice call through the existing VoIP protocol of the VoIP system, and to affect the existing VoIP service by enabling the transmission and reception of video data according to the user's request using the DTMF signal while the voice call is connected It is to provide a video communication service without affecting.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Specific details appear in the following description, which is provided to help a more general understanding of the present invention, and it is obvious to those skilled in the art that the present invention may be practiced without these specific matters. will be. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a connection configuration diagram of a video adapter device for VoIP according to the present invention, Figure 2 is an internal configuration diagram of a video adapter device for VoIP according to the present invention.

As shown in the figure, the video adapter device for VoIP (VA) is connected to the existing VoIP system (V), largely the general telephone processing unit 100, network processing unit 200, image processing unit 300, DTMF generation unit ( 400), an IP / port number acquisition unit 500, a key input unit 600, and a central control unit 700.

The landline processing unit 100 includes a Foreign Exchange Office (FXO) module 102 that enables a public public telephone network connection, and a Foreign Exchange Station (FXS) module 104 that allows a landline to be connected to receive VoIP service. It is included. The FXO module 102 of the video adapter device (VA) is connected to an FXS module (not shown), which is an RJ11 telephone connection terminal of the VoIP system (V), and receives a voice signal and a telephone signal from a telephone. Provide voice call through V).

The network unit 200 includes an RJ45 module 202 for connecting to a VoIP system and an Ethernet, and an RJ45 module 204 for connecting an Ethernet to a personal PC. The RJ45 module 202 of the video adapter device VA is connected to the RJ45 module (not shown) of the VoIP system V to provide a network environment with the VoIP system.

The image processing unit 300 interfaces with the camera 302 for image input, the LCD 304 for image output, and the H.263 and MPEG for interfacing the image signals input from the camera 302 to the LCD 304. Including a video codec 306, such as when the user provides a video call service for providing video information.

The DTMF signal generator 400 generates a DTMF signal for connecting a predetermined video call. For example, a DTMF signal for connecting a predetermined video call includes a video confirmation DTMF signal for checking whether a video adapter device can make a video call, and a video response DTMF signal, which is a response signal, for a video call connection. 'Video request DTMF signal' requesting video call, 'Video connection DTMF signal' accepting video call connection request, 'Video rejection DTMF signal' rejecting video call connection request, 'Video call end DTMF signal' to end video transmission and reception Etc.

Preferably, the video confirmation DTMF signal and the video response DTMF signal corresponding to the video confirmation DTMF signal are automatically generated after the voice call connection between the calling and receiving video adapter devices is completed. Further, the other DTMF signals are configured to be generated by a key input from the key input unit 600 of the video adapter device or the key input unit (not shown) of the general telephone.

The IP / port number acquisition unit 500 is responsible for obtaining a port number for transmitting and receiving the public IP and video data to which the video adapter device VA is connected. Here, the port number for the transmission and reception of public IP and video data is transmitted as a continuous DTMF signal according to a predetermined format.

The key input unit 600 is for a user to perform a video call-related key input. For example, the key input unit 600 may include a “video call” button for starting / stopping a video call and a direction key selection button for menu operation. .

The central control unit 700 controls the overall operation of the device to make a voice call or a video call.

The video adapter device for VoIP according to the present invention can be independently connected to the Internet by separately assigning a private IP through a router. The same environment can be considered when additional IP is used from an ISP without going through a VoIP system, or when an additional router is installed for a video adapter device using only a modem.

In order to be able to make a video call by connecting to an existing VoIP network, the video adapter device (VA) should be able to obtain the following two pieces of information, and this function is performed by the IP / port number acquisition unit 500.

(1) Public IP to which the video adapter device is connected

(2) Port number through which the video adapter device sends and receives video data

If your video adapter device is assigned a public IP address from your ISP, you can check your IP and port number.

If the video adapter device is assigned a private IP like a VoIP system, it should be able to identify the public IP of the connected NAT router and the port number assigned by the NAT router for video RTP sent and received from the video adapter device. How to check this can also be confirmed in conjunction with the STUN (Simple Traversal of UDP through NATs) server on the Internet.

If your NAT router supports UPnP, you can easily determine the desired value by this protocol. Or you can set or check the value through NAT router's internal configuration protocol (telnet, web).

3 is a configuration diagram of a VoIP service including a video adapter device for a VoIP system according to the present invention, and FIGS. 4A and 4B are flowcharts illustrating a video call service method using the video adapter device for a VoIP system according to the present invention. 5 is a flowchart illustrating a method of ending a video call in a video call service according to the present invention. For convenience of explanation, the calling party video adapter device will be abbreviated as VA1, and the calling party video adapter device will be abbreviated as VA2.

3, 4A, and 4B, the video call service according to the present invention proceeds as follows.

2-１. Boot VA1, VA2.

2-２. Obtains the port number for the transmission and reception of public IP and video data of VA1 and VA2.

2-３. The voice call is on standby.

2-４. The user of the general telephone T1 picks up the handset and presses the other party's number.

2-５. Thereafter, the process of voice call connection is performed in the same manner as the above-described steps (1-2) to 1-1).

2-６. After the voice call is connected, VA1 generates a video confirmation DTMF signal to check whether the other party is equipped with a video adapter capable of making a video call (eg DTMF 'C').

2-７. Receiving the image confirmation DTMF signal, VA2 transmits an image response DTMF signal. (E.g. DTMF ‘A’)

2-７-１. The VA2 displays the “waiting for video call” message on the LCD screen after sending a video response DTMF signal.

2-iii. The VA1 displays the phrase "Video call available" on the LCD screen after receiving the video response DTMF signal.

2-iii. Caller presses “Video Call” button on keypad part of VA1 to connect video call during voice call.

2-10. VA1 sends a video request DTMF signal to VA2 (e.g. DTMF 'C').

2-11. The VA2 notifies the user that a video connection request has been received through the LCD screen or voice after receiving the video request DTMF signal.

2-12. The receiver sends the video connection DTMF signal by pressing the “Video Call” button on the keypad of the VA2 (eg DTMF ‘*’).

2-13. In VA1, the public IP address and the video RTP port number identified in advance in step (2-2) are transmitted to the counterpart side VA2 as a continuous DTMF signal according to a predetermined format, and are ready to receive an image.

2-12-１. If the receiver does not want to make a video call, the menu operation sends a video rejection DTMF signal (eg DTMF ‘#’).

2-13-１. If the video rejection DTMF signal is transmitted or received, both parties will continue the voice call.

2-14. After receiving VA1's public IP and video RTP port number, VA2 sends its public IP and video RTP port number to the sender's VA1 as a continuous DTMF signal, and starts sending and receiving video with the sender's IP and port number. .

2-15. Receiving the other party's public IP and video RTP port number, VA1 starts receiving video and sends video to the receiver's IP and port number.

Referring to FIG. 5, the end of the video call proceeds as follows.

3-１. During the video call, the user starts the video call as follows.

3-1-1. Press the “Video Call” button on the keypad part of VA1 again.

3-1-1. When the menu is displayed, select End Video Call through the menu operation.

3-1-1-3. Hang up the handset of the telephone and end the voice call.

3-２. VA1 transmits a video call end DTMF signal to VA2, and ends transmission and reception of video.

3-３. The video call end VA2 receiving the DTMF signal ends the transmission and reception of the video.

3-４. When the user puts down the handset, VA1 and VA2 are in the state of waiting for a voice call in step 2-3.

3-４-１. If the user does not put down the handset, the video connection standby state of steps (2- 7-1) and (2-８) is made, and the voice call state is performed.

As described above, the present invention has an advantage of enabling a multimedia service including a video call at a minimum cost while maintaining the existing VoIP system configuration. Therefore, the existing service provider can easily switch to the video communication service without having to change the soft switch, router, VoIP terminal, etc. currently being used for the service.

In addition, the present invention provides an advantage that does not affect the existing VoIP service because the video call connection and the transmission of video information is made using the DTMF signal.

Claims (9)

A video adapter device that provides a voice call service using a VoIP protocol and is connected to a VoIP system including an FXS module and an RJ45 module to provide a video call service under a VoIP service environment. A general telephone that receives a voice signal and a telephone signal from the telephone, including an FXO module connected to the FXS module of the VoIP system, and a second FXS module connected to the telephone. A processing unit; A network processing unit including a second RJ45 module connected to the RJ45 module of the VoIP system to provide a network environment with the VoIP system; A video for providing video information for a video call service when a user requests a video call, including a camera for video input, an LCD for video output, and an image codec for interfacing the video signal input from the camera to be displayed on the LCD. A processing unit; A DTMF signal generator for generating a DTMF signal for a predetermined video call connection; An IP / port number acquisition unit for obtaining a port number for transmitting and receiving public IP and video data to which the video adapter device is connected; And a central control unit for controlling the overall operation of the video adapter device to make the voice call or the video call. The method according to claim 1, The DTMF generator automatically generates a video confirmation DTMF signal and a video response DTMF signal for checking whether the video adapter is available for video call when the voice call connection between the video adapter devices is completed. And a video adapter device for a VoIP system. The method according to claim 1, The DTMF generator generates a DTMF signal corresponding to a key input from an external device. When requesting a video call connection, the video request DTMF signal is used. When the DTMF generator accepts the video call connection request, the DTMF signal is input. And a video rejection DTMF signal when rejecting a video call connection request, and a video call termination DTMF signal when terminating video transmission and reception. delete In the video call service providing method using a video adapter device for VoIP system, A first step of obtaining, by the calling party video adapter device and the called party video adapter device, a port number for transmitting and receiving respective public IP and video data; After the voice call connection between the calling party video adapter device and the called party video adapter device, the calling party video adapter device confirms whether the called party video adapter device can make a video call with the called party video adapter device. Transmitting a DTMF signal '; If the called party's video adapter device is capable of video telephony, transmitting, by the called party's video adapter device, a video response DTMF signal to the calling party's video adapter device; A fourth step of, when the caller requests a video call connection, the caller-side video adapter device sends a 'video request DTMF signal' to the receiver-side video adapter device; A fifth step of, when the called party accepts the video call connection request, the called-side video adapter device transmitting a 'video connection DTMF signal' to the caller-side video adapter device; And a sixth step in which the caller-side video adapter device and the receiver-side video adapter device perform video transmission and reception using port numbers for transmission and reception of respective public IPs and video data obtained in the first step. A video call service providing method using a video adapter device for a VoIP system. delete The method according to claim 5, In the fifth step, If the called party rejects the video call connection request, the called party video adapter device sends a video rejection DTMF signal to the calling party video adapter device and then returns to the video call standby mode, where the voice call is continuously maintained. A video call service providing method using a video adapter device for a VoIP system, characterized in that the. The method according to claim 5, In the sixth step, And a port number for transmitting and receiving the public IP and video data is transmitted as a continuous DTMF signal according to a predetermined format. delete

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