KR100879362B1 - Method and apparatus for supporting of video communication service based on sip - Google Patents

Abstract

A method for supporting the video call service based on the SIP and an apparatus therefor are provided to make the video call service possible even without a high-priced video phone by separately processing video data and voice data during a video call using the SIP. An SIP message processor(210) processes an SIP message and messages related to the establishment and release of an SIP session, and changes the SIP message so that a video call can be supported during the capability exchange in a process of establishing the SIP session between a terminal and an opposite terminal. A registration processor(220) performs the registration of information about the terminal and a video device. A data processor(230) separates and integrates image data and voice data, and an interface(250) connects an AP and the terminal.

Description

Method and apparatus for supporting video call service based on SIP {Method and apparatus for supporting of video communication service based on SIP}

The present invention relates to a method and a device for supporting a video call service, and more particularly, to a method and a device for supporting a video call service based on a Session Initiation Protocol (SIP) using a voice terminal and a video device.

Voice over Internet Protocol (VoIP), a service that delivers video, voice, and fax messages over the Internet, allows users who want to use the Internet to access the Internet from their PCs, using independent devices with Internet protocols, In many cases, such as when dialing and connecting to a gateway from a PSTN terminal, the device transmits real-time media such as voice and video.

When VoIP service is used, a means for finding and signaling a counterpart to communicate with is required.The VoIP signaling types are H.323 of the International Telecommunication Standardization Sector (ITU-T) and Session Initiation Protocol (SIP) of the Internet Engineering Task Force (IETF). There is.

So far, H.323-based VoIP service development has been developed a lot, but recently, SIP is easy to parse, compile, expandable, and text-based, so it is easier to implement than H.323. have.

SIP is modeled on the basis of simple mail transfer protocol (SMTP), e-mail, hypertext transfer protocol (HTTP), and the Web. Such SIP is a client-server protocol in which a server sends a response when a client sends a request. SIP reuses HTTP's syntax and semantics in many parts, including response code architectures, message headers, and the entire operation process, and performs HTTP-like transactions.

1 is a flowchart illustrating an example of a SIP-based video call service method, in which a calling terminal and a receiving terminal are both SIP-based video terminals.

The calling terminal requests a session setup from the called terminal through an INVITE message (supporting voice and video), and the called terminal informs the calling terminal that the call is waiting at the called terminal through a 180 ringing message. When the call is received by the user, the called terminal informs the call establishment acceptance of the calling terminal through a 200 OK message, and the calling terminal transmits an ACK message to the called terminal. As a result, session setting is completed between the calling terminal and the called terminal, and voice and image data are transmitted and received through an encoding method, a port number, and a transmission protocol included in the INVITE message.

The above-described SIP message is composed of a header and a body. The body of the SIP message is described by a Session Description Protocol (SDP). The SIP sends an INVITE message so that the user can participate in the multimedia session, and the user terminal must periodically multicast the packet consisting of the header and the SDP to a specific address and port.

For example, the INVITE message describes the message type and SIP version information on the first line. Subsequently, the SIP request originator (below "From:") and the SIP request recipient (below "To:") are described, and in "Contact", the actual address of the sender is described. "CSeq" describes a sequence number for distinguishing retry messages, and "Content-Type" and "Content-Length" describe the type and length of a message (SDP: Session Description Protocol).

Details of Session Datagram Protocol (SDP) are described below "v = 0". In particular, the port number of an image and the port number of an audio are described, and a transmission protocol method (for example, RTP: Real-time Transport Protocol) is described.

2 is a flowchart illustrating another example of a SIP-based video call service method, in which the called terminal does not support the video call service.

Referring to FIG. 2, when a calling terminal requests a session setup to a called terminal through an INVITE message (voice and video support), the called terminal does not support a video call, and thus it is impossible to make a video call through a 606 UNACCEPTABLE message. Notify Then, the calling terminal reconfigures the INVITE message to support voice only and delivers it to the called terminal. Accordingly, the called terminal informs the calling terminal that the called terminal is waiting for a call through a 180 ringing message. When the call is received by the user, the called terminal notifies the originating terminal's acceptance of the session establishment through a 200 OK message, and the calling terminal transmits an ACK message to the called terminal. Therefore, the session setting is completed between the calling terminal and the called terminal, and only voice data is transmitted and received through an encoding method, a port number, and a transmission protocol included in the INVITE message.

As described above, if the called terminal does not support the image, the calling terminal transmits a session establishment request message (INVITE message) supporting only voice through the 606 response message to perform only the voice call service. In this case, there was a problem in that no video call service can be provided at all. That is, a video call is an obstacle to dissemination to the public because all participants must have an image support terminal.

In addition, as the number of applications such as education using video call increases, methods for providing the above services using a mobile communication terminal supporting WCDMA and the like have been developed. However, since communication burdens such as call charges and data usage charges are further increased, there is an urgent need for a solution to solve the above-mentioned problems.

The present invention was devised to meet the above requirements, and an object of the present invention is to separate video and audio data during a video call using SIP (Session Initiation Protocol) so that a video call service can be used without an expensive video phone. An apparatus and method for supporting a call service are provided.

For the above purpose, a method for supporting a SIP-based video call service using a voice terminal and a video device of one embodiment of the present invention includes: (a) modifying image support information of the voice-only terminal to perform the voice-only; Relaying a SIP session establishment between a terminal and a counterpart terminal; And (b) separating the image data and the voice data transmitted from the counterpart terminal when the SIP session setup is completed, and transmitting the image data to the video device and the voice data to the voice-only terminal. It is characterized by.

In addition, the method for supporting a SIP-based video call service using a voice terminal and a video device according to another aspect of the present invention, (a) the SIP session establishment request between the voice terminal and the other terminal from the video device; Receiving a message and delivering the message to the voice-only terminal; (b) receiving an acceptance message for the SIP session establishment request from the voice-only terminal and transmitting the received message to the video device; (c) upon receiving a SIP session establishment request message from the voice-only terminal with the counterpart terminal, modifying image support information of the voice-only terminal and transmitting the modified picture support information to the counterpart terminal; And (d) when the SIP session setup is completed, separating the image data and the audio data transmitted from the counterpart terminal and transmitting the image data to the video device and the voice data to the voice dedicated terminal. And integrating audio data received from the video data and image data received from the video device to the counterpart terminal.

At this point, the SIP session establishment request message may include address information of the counterpart terminal.

On the other hand, a device supporting a SIP-based video call service using a voice-only terminal and a video device of one embodiment of the present invention changes the contents of a SIP message to establish a SIP session between the voice-only terminal and the counterpart terminal. SIP message processing unit; And a data processing unit for separating the image data and the voice data transmitted from the counterpart terminal or integrating the voice data received from the voice-only terminal and the image data received from the video device when the SIP session setup is completed. It features.

According to the present invention, a video call is possible without an expensive video terminal by providing an AP (or an independent server) that processes / relays a SIP message and separates / integrates video data and voice data after establishing a SIP session. There is an effect that can facilitate the use of the service.

In addition, according to the present invention, an existing video non-supporting terminal can be used without any special change, and since a hardware-based voice-only terminal is used for high-quality voice transmission compared to using a software-based terminal, high quality voice can be obtained. And, there is no unnecessary effect of a separate equipment such as a headset.

In addition, according to the present invention, since a video device with a large screen can be easily used as compared with using a video terminal, there is an effect of obtaining a screen configuration and various functions more suitable for education or video conference.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, in the following description, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

3 is a block diagram illustrating a part of a SIP-based video call service system according to an embodiment of the present invention, and shows a part of a calling party or a called party system.

As shown in FIG. 3, the system includes a SIP server 100, an AP 200, a terminal 300, and an imaging device 400 connected to another system through an internet network. In particular, the terminal 300 and the video device 400 are connected to the AP 200 through wired / wireless connection. For example, FIG. 3 (A) shows that all of the APs are wirelessly connected, and FIG. 3 (B) shows that the APs are wirelessly connected to the terminal and the video device 400, and FIG. 3 (C). ) Indicates that the AP is wirelessly connected to the terminal with a video device 400.

The SIP server 100 updates and manages information on the current location of the terminal 300, analyzes the location of the other terminal (eg, the called terminal) requested by the terminal 300, and connects to another server having the other terminal. Or informs the terminal 300 of the location of another server having the other terminal.

The terminal 300 is an example of a voice-only Internet terminal, and can be wired or wireless based. In particular, in the case of a wireless base, a wireless interface for wireless communication with the AP 200 is embedded. Examples of protocols for such a wireless interface include Bluetooth and Wi-Fi. In addition, the terminal 300 may include a registration agent for registering an IP address of the video device 400 on the AP 200. The registration agent is configured to receive an IP address of the video device 400 that is linked with the user from the user, and deliver it to the AP 200.

The video device 400 may display image data transmitted from the AP 200. For example, the video device 400 may be an IP address-based device such as a user computer or a notebook computer. In addition, the video device 400 may further include an image module capable of processing image data, and may be implemented to convert a caller's appearance into image data and transmit the image data to the AP 200.

The AP 200 relays SIP messages between the SIP server 100 and the terminal 300, manages registration / change / release of information on terminals 300 interworking with the SIP server 100, and SIP session setup is completed. When the voice and image data are separated, the voice and image data are separated and transmitted to the terminal 300 and the video device 400, or the voice and image data received from the terminal 300 and the video device 400 are integrated and transmitted to the SIP server 100. . In addition, the AP 200 processes the SIP message in the SIP session establishment process and supports the terminal 300 as if it is a terminal capable of supporting a video call. The AP 200 may include the above-described function in a wire-based independent server (or residential VoIP gateway) to cover a rather large area. Hereinafter, the AP will be described in more detail.

4 is a diagram illustrating a configuration of an AP shown in FIG. 3.

As shown in FIG. 4, the AP 200 includes a SIP message processor 210, a registration processor 220, a data processor 230, a controller 240, and an interface 250.

The SIP message processor 210 processes a SIP message and processes a message related to SIP session establishment and SIP session release. In particular, the SIP message processing unit 210 changes the SIP message so that the video call is supported during the capability exchange during the SIP session establishment process between the terminal 300 and the other terminal. For example, when the terminal 300 is an incoming call, if the INVITE message (voice and image data support, m = audio, m = video) of FIG. 3 received from the SIP server 100 is transferred to the terminal 300 as it is. Since the same phenomenon as that of FIG. 2 occurs, the SIP message processing unit 210 changes the SIP message to "no video call" (eg, deletes m = video item in the INVITE message) and delivers it. In addition, when the terminal 300 is the originating call, the SIP message processing unit 210 changes the INVITE message (voice only, m = audio) received from the terminal 300 to "voice and video call" (eg INVITE). In the message, m = video item is added to the SIP server 100.

The registration processor 220 performs terminal information registration and image device information registration. The terminal information registration registers whether or not video call support is possible for the terminal 300 interworking with the AP 200, and also registers a service subscription according to the present embodiment. Based on this, the SIP message processor 210 determines whether to process the message. The image device information registration registers the display providing capability of the image device 400 interworking with the AP 200 and whether the image module is supported.

The data processor 230 separates and integrates image data and audio data. For example, in the case of separation, the destination IP address and the port number of the image data in the transmission IP address and the port numbers of the voice and image data received from the SIP server 100 may be the IP address and the port number of the video device 400. Change to In addition, in the case of integration, different destination IP addresses and port numbers received from the terminal 300 and the video device 400 are changed into IP addresses and port numbers for the other terminal.

The interface 250 is for interworking between the AP 200 and the terminal 300 and may be wireless or wired. In particular, in the case of wireless, as described above, a wireless protocol such as Bluetooth, Wi-Fi, or the like is used.

The controller 240 controls the operation of the above-described components, and will be described in more detail with reference to FIGS. 5 and 6 to be described later.

Although not shown in FIG. 4, the AP 200 may include a registration agent for registering an IP address of the video device 400. The registration agent may be configured to receive an IP address of the video device 400 that is linked with the user from the user or to automatically receive the IP address of the video device 400 when the AP 200 of the video device 400 is connected. It may be.

FIG. 5 is a flowchart illustrating an operation when an AP of FIG. 3 receives a call from another terminal.

First, the AP 200 receives an IP address of the video device 400 to be linked with itself from the terminal 300 (S411). Such registration may include a corresponding function in the terminal 300 itself, or register the video device 400 to be linked with itself by using the registration agent in the AP 200. For example, when the AP 200 is wirelessly interworking with the video device 400, when the AP 200 is connected to the video device 400 through a wireless protocol, the AP 200 is connected to the IP of the video device 400. It may further include a registration agent capable of recognizing or setting an address.

Subsequently, the AP 200 modifies the terminal information (S413). That is, the AP 200 changes the information on the terminal 300 to the video call since the current state of the terminal 300 is not video call when the SIP session is established with the other terminal.

Then, when the AP 200 receives the INVITE message from the SIP server 100, it is checked whether the terminal (ie, the other terminal) of the destination IP address is registered in the service of the present invention (S415). When the service registration is confirmed, the medium support information of the INVITE message is changed to non-video call (voice enabled) and transmitted to the terminal 300 connected with the self (S417-S419).

Then, the SIP session setup process is performed between the SIP server 100 and the terminal 300 in this state, and then voice and image data are relayed (S421-S433 and S437-S439). In this case, in the case of the voice and image data relay, the AP 200 separates the voice and image data received from the SIP server 100 so that the voice data is the terminal 300 and the image data is the image device 400. On the contrary, the voice data received from the terminal 300 and the image data received from the video device 400 are integrated and transferred to the SIP server 100 (S435).

FIG. 6 is a flowchart illustrating an operation when an AP of FIG. 3 makes a call to another terminal.

First, the AP 200 receives an IP address of the video device 400 to be linked with itself from the terminal 300 (S511). Since this registration is the same as step S411 of FIG. 5, detailed description thereof will be omitted.

Subsequently, the AP 200 modifies the terminal information (S513). That is, the AP 200 changes the information on the terminal 300 to a video call since the state of the current terminal 300 is not video call when the SIP session is established with the other terminal.

Thereafter, when the AP 200 receives the INVITE message from the terminal 300, it is checked whether the terminal 300 is registered in the service of the present invention (S515). When the service registration is confirmed, the medium support information of the INVITE message is changed to video callable and transmitted to the SIP server 100 connected to the service (S517-S519).

Then, the SIP session setup process is performed between the SIP server 100 and the terminal 300 in this state, and then voice and image data are relayed (S521-S533 and S537-S539). In this case, in the case of the voice and image data relay, the AP 200 separates the voice and image data received from the SIP server 100 so that the voice data is the terminal 300 and the image data is the image device 400. On the contrary, the voice data received from the terminal 300 and the image data received from the video device 400 are integrated and transferred to the SIP server 100 (S535).

FIG. 7 is a flowchart illustrating an operation when a click-to-dial service is provided by a video device according to another embodiment of the present invention, wherein the video device 400 includes a click-to-web engine for a click-to-dial service. A session is established between the terminal 300 interworking with itself and the other terminal. For example, the user selects (clicks) a telephone number of the called terminal by using the click-to-web engine provided by the video device 400. When the click-to-web engine is linked with a web page and a specific telephone number is selected from the user, the click-to-web engine transmits a SIP URL (relative address) of the called terminal to the terminal 300 and a SIP message for performing a session connection to the called terminal. The terminal receiving the message transmits a request message for establishing a session to the called terminal.

Specifically, first, the AP 200 receives an IP address of the video device 400 to be linked with itself from the terminal 300 (S611). Since this registration is the same as step S411 of FIG. 5, detailed description thereof will be omitted. Subsequently, the AP 200 modifies the terminal information (S613). That is, the AP 200 changes the information on the terminal 300 to a video call since the state of the current terminal 300 is not video call when the SIP session is established with the other terminal.

Subsequently, the AP 200 receives a REFER message for requesting a video call between the terminal 300 interworking with the video device 400 and the called terminal selected by the user and the SIP URL of the receiving terminal. The receiver transmits to the terminal 300 (S615-S617). Then, the terminal 300 transmits the 202 Accepted message and the NOTIFY message to the video device 400 via the AP 200 as a notification of the request acceptance and its status for the REFER message (S619-). 625) Then, the video device 400 notifies the terminal 300 of the received message to the terminal 300 using the 200 OK message through the AP 200 (S627-S629). Then, the terminal 300 transmits the SIP session establishment request message (ie, INVITE message) including the medium support information (m = audio) to the AP 200 (S631).

Accordingly, when the AP 200 receives the INVITE message from the terminal 300, the AP 200 modifies the medium support information of the terminal 300 and transmits the medium support information to the SIP server 100 (S633-S635). ).

Then, the SIP session establishment process is performed between the SIP server 100 and the terminal 300 in this state, and then voice and image data are relayed (S637-S649, S653-S655). In the case of the voice and image data relay, the AP 200 separates the voice and image data received from the SIP server 100 and transmits the voice data to the terminal 300 and the image data to the video device 400. On the contrary, the voice data received from the terminal 300 and the image data received from the video device 400 are integrated and transferred to the SIP server 100 (S651).

On the other hand, the video call service supporting method according to the present invention can be created by a computer program. For example, codes and code segments constituting a program based on the algorithm disclosed in the video call service supporting method described above can be easily inferred by a computer programmer in the art. Such a video call service support program may be implemented by being stored in a computer-readable recording medium and being read and executed by a computer.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features, The examples are to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as

1 is a flowchart illustrating an example of a SIP-based video call service method.

2 is a flowchart illustrating another example of a SIP-based video call service method.

Figure 3 is a block diagram showing a part of a SIP-based video call service system according to an embodiment of the present invention.

4 is a diagram illustrating a configuration of an AP shown in FIG. 3.

5 is a flowchart illustrating an operation when an AP of FIG. 3 receives a call from a counterpart terminal.

6 is a flowchart illustrating an operation when an AP of FIG. 3 makes a call to a counterpart terminal.

7 is a flowchart illustrating an operation when a click-to-dial service is provided by a video device according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: SIP server

200: access point (AP)

210: SIP message processing unit 220: Registration processing unit

230: data processing unit 240: control unit

250: interface

300: terminal 400: video device

Claims (12)

As a method of supporting a SIP-based video call service using a voice terminal and a video device, (a) modifying image support information of the voice-only terminal to relay SIP session establishment between the voice-only terminal and the counterpart terminal; And (b) separating the image data and the voice data transmitted from the counterpart terminal when the SIP session is set up, and transmitting the image data to the video device and the voice data to the voice-only terminal. Video call service support method. The method of claim 1, and (c) integrating the voice data received from the voice-only terminal and the image data received from the video device and forwarding the integrated data to the counterpart terminal. The method of claim 2, wherein step (c) comprises: And changing a destination IP address and a port number set in the image data to an IP address and a port number of the counterpart terminal and transferring the same to the counterpart terminal. The method according to any one of claims 1 to 3, wherein step (b) comprises: And converting the destination IP address and port number set in the image data into an IP address and port number of the video device and transferring the same to the video device. The method according to any one of claims 1 to 3, wherein step (a) comprises: When the SIP session is set, the video call service support method, characterized in that the content of the video support item from the content of the SIP message received from the counterpart terminal to change from image support to non-video support to the voice-only terminal. The method of claim 5, wherein step (a) comprises: When the SIP session is set, the video call service support method, characterized in that the content of the video support item from the content of the SIP message received from the voice-only terminal to change from the image support to the image support enabled and forwarded to the counterpart terminal. As a method of supporting a SIP-based video call service using a voice terminal and a video device, (a) receiving from the video device a SIP session establishment request message between the voice-only terminal and the counterpart terminal, including the IP address of the counterpart terminal, and transmitting the received message to the voice-only terminal; (b) receiving an acceptance message for the SIP session establishment request from the voice-only terminal and transmitting the received message to the video device; (c) receiving a SIP session establishment request message with the counterpart terminal from the voice-only terminal and transmitting the message to the counterpart terminal; And (d) When the SIP session setup is completed, the image data and audio data transmitted from the counterpart terminal are separated and the image data is transmitted to the video device, and the audio data is transmitted to the voice dedicated terminal, or the voice dedicated terminal. And integrating the audio data received from the video data and the image data received from the video device to the counterpart terminal. The method of claim 7, wherein step (c) is And modifying the video support information of the voice-only terminal to transmit a SIP session establishment request message to the counterpart terminal. As a device supporting SIP-based video call service using a voice-only terminal and a video device, A SIP message processing unit for changing contents of a SIP message to establish a SIP session between the voice-only terminal and the counterpart terminal; And When the SIP session setup is completed, the data processing unit for separating the image data and the voice data transmitted from the counterpart terminal, or integrating the audio data received from the voice-only terminal and the image data received from the video device; A video call service supporting device, characterized in that. The method of claim 9, The SIP message processing unit may change the content of the image support item from the image support enabled to the image unsupported in the contents of the SIP message received from the counterpart terminal when the SIP session is set up, or the SIP message received from the voice dedicated terminal. An apparatus for supporting a video call service, characterized in that the contents of an image support item are changed from image support to video support enabled. The method of claim 9, The data processor supports the video call service, changing the destination IP address and the port number set in the image data to the IP address and the port number of the counterpart terminal or the IP address and the port number of the video device. Device. The method according to any one of claims 9 to 11, The SIP message processor, upon receiving a SIP session establishment request between the voice-only terminal and the counterpart terminal from the video device, performs a session connection between the address of the counterpart terminal and the counterpart terminal to the voice-only terminal. And transmitting a message, receiving a session establishment request message from the voice-only terminal, and transmitting the message to the counterpart terminal.

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