KR20060055277A - Alternation image service method for call waiting occurrence in telecommunication system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an alternative video service method in a communication system and a computer readable recording medium having recorded thereon a program for realizing the method.

2. The technical problem to be solved by the invention

The present invention provides an alternative video service method and a method for transmitting a still image, a video, etc. designated by a subscriber to a screen of a terminal when at least one of the calling and receiving terminals uses a video telephone terminal (video terminal). Its purpose is to provide a computer readable recording medium having recorded thereon a program.

3. Summary of Solution to Invention

According to an aspect of the present invention, there is provided a video service method in a communication system, comprising: a service registration step of registering an 'alternate video service' subscription capable of transmitting a desired video during a call, and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a SDP (Session Description Protocol) information of a called terminal as the SIP application server makes a call to a corresponding called number and responds to an incoming call when the calling subscriber calls; A first checking step, wherein the SIP application server checks SDP information of the called terminal to check whether the called terminal supports video; As a result of the first checking, if the called terminal supports video, the SIP application server notifies the calling terminal of SDP information of the called terminal, establishes a connection with a media server, and then checks the SDP information of an outgoing signal. A second checking step of checking whether the terminal supports the image; And if the originating terminal does not support the video as a result of the second check, the SIP application server informs the called terminal by changing the SDP information [receiveOnly] , and if the originating terminal supports the video, the originating terminal And providing an image to the called terminal through the media server, after notifying SDP information of the called terminal.

4. Important uses of the invention

The present invention is used in a communication system.

Alternative video, originating terminal, called terminal, advertisement, avatar

Description

Alternative image service method in communication system {Alternation image service method for call waiting occurrence in telecommunication system}             

1 is an exemplary configuration diagram of a communication system to which the present invention is applied;

2 is a flowchart illustrating an alternative video service method according to the present invention;

3 is a flowchart of another embodiment of an alternative video service method according to the present invention;

4A and 4B are flowcharts of still another embodiment of an alternative video service method according to the present invention.

* Explanation of symbols on the main parts of the drawing

10: wireless communication network 11: wireless communication terminal

12: MSC 13: Home Location Register (HLR)

14,24: Service Controller 15: Short Message Center (SMSC)

16,25: special resource processor (IP) 20: wired communication network

21: Landline Phone 22: POTS / xDSL

23: service switch (SSP) 30: VoIP network

31: VoIP terminal 32: soft switch

33: signaling gateway 34: trunk gateway

35: access gateway 36: SIP application server

37: media server

The present invention relates to an alternative video service method in a communication system and a computer-readable recording medium recording a program for realizing the method, and more particularly, to a video telephone terminal (video terminal) on at least one side of an origination and reception terminal. The present invention relates to an alternative video service method capable of transmitting a still image, a moving picture, and the like designated by a subscriber to a terminal screen, and a computer readable recording medium storing a program for realizing the method.

Nowadays, the remarkable development of the information and telecommunications industry makes it possible to realize things in the past that would have been possible in the imagination.

Now, new technologies like the Internet and mobile phones are changing our real lives. In addition, there has been a great change in the general telephone lines used mainly at home as data communication means. In other words, a faster and more efficient communication environment, such as Integrated Service Digital Network (ISDN), Asymmetric Digital Subscriber Line (ADSL), and cable modem, is now available in each home.

Many new services may emerge when the new environment improves the communication environment, but the first thing to think about is video communication such as video telephony and video conferencing. This is because even if only ISDN communication environment is established, an environment capable of realizing video communication can be established.

Indeed, for the purpose of video communication, protocols promised to each other are required. These protocols have been recommended by international standardization bodies (ITU-T, IETF, etc.) as H.320, H.323, and SIP.

Among these Recommendations, H.320 is a protocol that combines other protocols such as H.261 by video and G.711 by voice. In particular, H.323 employs H.261 and H.263 as the video encoding method, and G.711, G.722, G.723.1, G.728, G.729, MPEG-1 audio, etc. It is a standard for Internet telephony (VoIP) made by ITU that combines other protocols. It is a standard for video telephony system that implements VoIP through gatekeeper. In addition, Session Initiation Protocol (SIP) is one of the protocol technologies for realizing VoIP services. The Internet Initiative Development Organization (IETF), an Internet standards development organization, aims to replace the H.323 standard technology adopted by most commercial Internet telephony services. As a developed standard, it can be referred to as a standard of a video telephone system that implements VoIP using a gateway or the like.

However, up to now, even if the caller / receiver terminal is a terminal capable of supporting video, the original function can be performed and even if a call is established between the caller / receiver terminal that supports video, the caller / recipient is simply It provides only the video screen of the camera or only the function of simply deleting the video.

However, in view of the current communication environment, the terminal of the calling party and the called party may not always be a video telephone terminal (video terminal). Of course, ultimately, although the goal is to communicate between video telephone terminals (video terminals) capable of supporting video, there is still no choice.

Accordingly, in consideration of the current communication environment and various multimedia service needs of subscribers, when an individual or a company makes / receives a call using a video telephone terminal (video terminal), an avatar, an animation, etc. is used instead of his own video information. There is an urgent need for a method of providing a still image or a moving image such as a still image or a moving image or a company advertisement. In particular, even if the user does not have a video telephone terminal (video terminal) and the other party has a video telephone terminal (video terminal), a method for providing the designated image (still image, video, etc.) to the other party This will have to be prepared.

The present invention has been proposed to meet the above requirements, and when at least one of the call destination terminals uses a video telephone terminal (video terminal) to make a call, the subscriber can designate a still image, a video, etc., to the terminal screen. It is an object of the present invention to provide an alternative video service method and a computer-readable recording medium recording a program for realizing the method.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, the present invention provides a video service method in a communication system, wherein a subscription of an alternative video service capable of transmitting a desired video during a call is registered, and a video to be transmitted during a call is registered from the subscriber. Service registration step; A call receiving step of receiving a SDP (Session Description Protocol) information of a called terminal as the SIP application server makes a call to a corresponding called number and responds to an incoming call when the calling subscriber calls; A first checking step, wherein the SIP application server checks SDP information of the called terminal to check whether the called terminal supports video; As a result of the first checking, if the called terminal supports video, the SIP application server notifies the calling terminal of SDP information of the called terminal, establishes a connection with a media server, and then checks the SDP information of an outgoing signal. A second checking step of checking whether the terminal supports the image; And if the originating terminal does not support the video as a result of the second check, the SIP application server informs the called terminal by changing the SDP information [receiveOnly] , and if the originating terminal supports the video, the originating terminal And providing an image to the called terminal through the media server, after notifying SDP information of the called terminal to the called terminal.

In addition, according to the present invention, if the called terminal does not support video as a result of the first checking, the SIP application server informs the calling terminal by changing the SDP information [sendOnly] , and responds to the called terminal. Characterized in that further comprising the step of transmitting to.

Meanwhile, the present invention provides a video service method in a communication system, comprising: a service registration step of registering a subscription of an 'alternate video service' capable of transmitting a desired video during a call, and registering a video to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal as the SIP application server makes a call to the called number and responds to the called when the call is made to the called subscriber; A first checking step, wherein the SIP application server checks SDP information of the called terminal to check whether the called terminal supports video; If the called terminal does not support the video, the SIP application server notifies the [sendOnly] calling terminal by changing the SDP information; If the called terminal supports video, the SIP application server notifying the calling terminal of SDP information of the called terminal; A second checking step of checking, by the SIP application server, SDP information of an outgoing signal to determine whether the calling terminal supports video; And if the calling terminal supports video, after establishing a connection with a media server, changing the SDP information to inform the called terminal of the video (receiveOnly) and sending the call through the media server. And providing an image providing the image to the terminal.

In addition, the present invention is characterized in that the second terminal, if the originating terminal does not support the video, the SIP application server further comprises the step of notifying the SDP information of the calling terminal to the called terminal.

On the other hand, the present invention provides a video service method in a communication system, comprising: a service registration step of registering an 'substitute video service' subscription capable of transmitting a desired video during a call, and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the receiver terminal supports the video by checking the SDP information of the called terminal; and checking the SDP information of the outgoing signal to confirm whether the video is supported by the calling terminal; And if the called terminal supports video and the calling terminal does not support video, the application server notifies the calling terminal of SDP information of the called terminal, connects a media server to the media server. It characterized in that it comprises a first image providing step of providing the image to the called terminal through.

In addition, according to the present invention, if the caller / receiver terminal does not support the image, the SIP application server changes the SDP information to inform the calling terminal [sendOnly] of the calling terminal, and the SDP information of the calling terminal. It characterized by further comprising the step of notifying to the called terminal.

In addition, the present invention provides a video service method in a communication system, comprising: a service registration step of registering a subscription of an "alternate video service" capable of transmitting a desired video during a call and registering a video to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the receiver terminal supports the video by checking the SDP information of the called terminal; and checking the SDP information of the outgoing signal to confirm whether the video is supported by the calling terminal; And if the called terminal does not support the video and the calling terminal supports the video, the called SIP application server changes the SDP information and sends [sendOnly] to the calling terminal, and notifies the media server. And a first image providing step of changing the SDP information and informing the called terminal to the called terminal and supporting the image to the calling terminal through the media server.

In addition, according to the present invention, if the caller / receiver terminal does not support the image, the SIP application server changes the SDP information and informs the [sendOnly] caller of the caller, and the SDP information of the caller terminal. It characterized by further comprising the step of notifying to the called terminal.

In addition, the present invention provides a video service method in a communication system, comprising: a service registration step of registering a subscription of an "alternate video service" capable of transmitting a desired video during a call and registering a video to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the receiver terminal supports the video by checking the SDP information of the called terminal; and checking the SDP information of the outgoing signal to confirm whether the video is supported by the calling terminal; And if the caller / called terminal supports video, the application server informs the calling terminal of SDP information of the called terminal, establishes a connection with the media server, and then sets the called terminal through the media server. to characterized in that provides the image, by changing the SDP information to inform the [image (receiveOnly)] the called terminal of including a first image providing step of providing the video to the calling terminal via the media server do.

In addition, according to the present invention, if the caller / receiver terminal does not support the image, the SIP application server changes the SDP information and informs the [sendOnly] caller of the caller, and the SDP information of the caller terminal. It characterized by further comprising the step of notifying to the called terminal.

In addition, the present invention provides a video service method in a communication system, comprising: a service registration step of registering a subscription of an "alternate video service" capable of transmitting a desired video during a call and registering a video to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the receiver terminal supports the video by checking the SDP information of the called terminal; and checking the SDP information of the outgoing signal to confirm whether the video is supported by the calling terminal; As a result of the check, if the calling / called terminal does not support the video, the called SIP application server changes the SDP information to inform the calling terminal of [sendOnly] and informs the calling terminal of the SDP information of the calling terminal. Informing to the; As a result of the check, if the called terminal supports video and the calling terminal does not support video, the application server informs the calling terminal of SDP information of the called terminal, connects a media server, and then through the media server. Providing a first image to the called terminal; As a result of the check, if the called terminal does not support the video and the calling terminal supports the video, the called SIP application server changes the SDP information to inform the calling terminal of [sendOnly] and informs the media server. Providing a second image by changing the SDP information after establishing a connection and informing the called terminal to the called terminal and supporting the image to the calling terminal through the media server; And if the caller / called terminal supports video, the application server informs the calling terminal of SDP information of the called terminal, establishes a connection with the media server, and then sets the called terminal through the media server. to characterized in that provides the image, by changing the SDP information to inform the [image (receiveOnly)] the called terminal of a third image providing step of providing the video to the calling terminal via the media server do.

In order to achieve the above object, the present invention, in order to replace the video service, a communication system having a processor, registered with the 'alternate video service' that can transmit the desired video during a call, and is transmitted during the call from the subscriber A service registration function for registering an image; A call receiving function that receives the SDP (Session Description Protocol) information of the called terminal as the SIP application server calls the called party number and responds to the incoming call when the calling subscriber calls; A first verification function, wherein the SIP application server checks SDP information of the called terminal to confirm whether the called terminal supports video; If the called terminal does not support video as a result of the first checking, the SIP application server notifies the [sendOnly] calling terminal by changing the SDP information and transmits a response to the called terminal; As a result of the first checking, if the called terminal supports video, the SIP application server notifies the calling terminal of SDP information of the called terminal, establishes a connection with a media server, and checks the SDP information of the calling signal. A second checking function for checking whether the calling terminal supports video; And if the originating terminal does not support the video as a result of the second check, the SIP application server informs the called terminal by changing the SDP information [receiveOnly] , and if the originating terminal supports the video, the originating terminal After providing the SDP information to the destination terminal, and provides a computer-readable recording medium recording a program for realizing the image providing function for providing the image to the destination terminal through the media server.

On the other hand, the present invention is a service for receiving an image to be transmitted during a call registered in the 'substitute video service' subscription that can transmit a desired video during a call to a communication system having a processor, for the alternative video service Registration function; A call receiving function for receiving a SDP (Session Description Protocol) information of a called terminal as the SIP application server makes a call to the called number and responds to a call when the call is made to the called subscriber; A first verification function, wherein the SIP application server checks SDP information of the called terminal to confirm whether the called terminal supports video; A function of notifying the [sendOnly] calling terminal of the SIP application server by changing the SDP information if the called terminal does not support the video as a result of the first checking; A function of notifying the calling terminal of SDP information of the called terminal by the SIP application server if the called terminal supports a video as a result of the first checking; A second checking function of the SIP application server to check whether the calling terminal supports the video by checking the SDP information of the calling signal; If the calling terminal does not support the video as a result of the second checking, the SIP application server notifying the called terminal of SDP information of the calling terminal; And if the calling terminal supports video, after establishing a connection with a media server, changing the SDP information to inform the called terminal of the video (receiveOnly) and sending the call through the media server. Provided is a computer readable recording medium recording a program for realizing an image providing function of providing the image to a terminal.

On the other hand, the present invention is registered in the 'substitute video service' subscription that can transmit the desired video during the call to the communication system equipped with a processor for the alternative video service, and receives the video to be transmitted during the call from the subscriber Service registration function; A call receiving function for receiving a SDP (Session Description Protocol) information of a called terminal as the SIP application server makes a call to the called party's called number when the calling subscriber makes a call; A confirmation function of the SIP application server to check whether the receiver terminal supports the video by checking the SDP information of the called terminal, and to check whether the calling terminal supports the video by checking the SDP information of the outgoing signal; As a result of the check, if the calling / called terminal does not support the video, the called SIP application server changes the SDP information to inform the calling terminal of [sendOnly] and informs the calling terminal of the SDP information of the calling terminal. Informing function; As a result of the check, if the called terminal supports video and the calling terminal does not support video, the application server informs the calling terminal of SDP information of the called terminal, connects a media server, and then through the media server. A first image providing function of providing the image to the called terminal; As a result of the check, when the called terminal does not support the video and the calling terminal supports the video, the called SIP application server notifies the [sendOnly] calling terminal by changing the SDP information and connects the media server. A second image providing function of changing the SDP information and informing the called terminal to the called terminal and supporting the image to the calling terminal through the media server; And if the caller / called terminal supports video, the application server informs the calling terminal of SDP information of the called terminal, establishes a connection with the media server, and then sets the called terminal through the media server. Program for realizing a third video providing function of providing the video to the calling terminal by changing the SDP information to the video (receiveOnly) and providing the video to the calling terminal through the media server. Provide a computer readable recording medium.

According to the present invention, when an individual or a company makes / receives a call using a video telephone terminal (video terminal), a still image or a video such as an avatar or an animation, or a still image such as an advertisement of a company, Define 'alternative video service' that can deliver video to the called party's terminal, and 'alternative video service' sends the alternative still image or video selected by subscriber (individual or company) instead of the caller's image information It is used when you want to.

In particular, the "alternative video service" may provide a still image or a video designated by the person (personal or corporate) even when the person does not have a video telephone terminal (video terminal) and the other party has a video telephone terminal. have.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of a communication system to which the present invention is applied.

An alternative video service is a program (e.g., a messenger type program) or a wired / wireless internet (WEB) installed in a terminal (a WEB or WAP / ME capable terminal, for example, a PC, a laptop, a PDA, a portable Internet terminal, etc.). , WAP / ME) can be connected to the operator's wired / wireless internet server and used after the proper sign-up procedure according to the access guide screen of the wired / wireless internet server. A still image or a moving image, such as a moving picture or a company advertisement, can be delivered to the opposite terminal. In addition to wired and wireless Internet access such as WEB or WAP, service registration based on ARS connection will be possible.

That is, the user can register and use the 'alternate video service' through a separate subscription procedure, and can be used separately from the subscriber's WEB or WAP / ME capable terminal (for example, PC, laptop, PDA, portable Internet terminal, etc.). A program (for example, a messenger type program) can be installed or used by using a wired / wireless internet, and a service subscriber can freeze a still image or video such as an avatar or animation to be provided during a call, or stop advertising of a company. You can select video or video and the selected video will be provided during the call.

'Alternative video service' users can use advertising and alternative video (still video, video) instead of video screen of caller / receiver, such as corporate call center, telephone room business, and company's internal telephone. It is possible. As such, the 'alternative video service' can be used by anyone, such as a company or an individual, and a service user can provide a still image or a video registered to the other party instead of his own video information after registering with the 'alternate video service'. have.

The 'alternate video service' may start a service in a different manner according to the operator's network (wireless communication network, wired communication network, VoIP network, BcN network, etc.), and a SIP (Session Initiation Protocol) application server It can be used by all subscribers of wired / wireless network of network operators equipped with the Media Server.

Basic information of the "alternative video service" subscriber, such as the subscriber's mobile phone number, the subscriber's home phone number, the subscriber's company phone number, etc., these numbers can be registered after performing authentication at the time of registration. In this case, the registered information may be modified, and may be modified after authentication.

Hereinafter, the caller / receiver terminals 11, 21, 22, and 31 for 'alternate video service' include a mobile communication terminal such as a wired / wireless telephone capable of voice communication, a POTS / xDSL terminal, a cellular phone, or a PCS phone, an IMT- Next generation mobile communication terminals such as 2000 (International Mobile Telecommunication), UMTS (Universal Mobile Telecommunication Service), personal digital assistant (PDA), VoIP terminal (SIP terminal, Soft Phone, H.323 terminal, etc.) As far as possible, voice communication of the receiving terminal is revealed that it is not subject to the type of the target network (wired communication network, wireless communication network, VoIP network, NGN network, BcN network, etc.) 10-30. However, one of the calling / receiving terminals, in particular, a data communication terminal supporting the video by the called terminal calling the call from the subscriber of the alternative video service or the calling terminal sending the call to the subscriber of the alternative video service. Telephone terminal), sufficient to perform the present service function.

That is, when the service subscriber makes a call, the caller provides the caller with the video (still video, video) designated by the caller (service subscriber) on the screen of the caller's video telephone terminal instead of the caller's video information. At this time, the calling terminal of the subscriber can be used even if it is not a video telephone terminal (video terminal).

In addition, when the service subscriber receives the call, the caller provides the caller with the video (still image, video) designated by the caller (service subscriber) on the screen of the caller's video telephone terminal instead of the caller's video information. At this time, the called terminal of the subscriber can be used even if it is not a video telephone terminal (video).

Meanwhile, the service setting time may be arbitrarily designated / released by the service subscriber, and in particular, in the present invention, a method of providing a replacement video to the caller / recipient is provided by changing SDP (Session Description Protocol) information and transmitting the replacement video. The following assumes a method of using an "INFO" message, but may be replaced by another method such as "NETANN".

Next, the function of each component of the communication system for the 'alternate video service' will be described.

The service switch point (SSP) 23 switches the call resource management and service of the terminals 21 of the wired communication network 20.

The mobile switching center (MSC) 12 switches call resource management and services of the terminals 11 of the wireless communication network 10.

Service control points (SCPs) 14 and 24 control intelligent network services, and manage information of intelligent network service subscribers and provide information requested by exchanges 12 and 23.

The Intelligent Peripheral (IP) (16,25) manages special resources such as tones, announcements, conference call bridge management, and text-to-speech (TTS) required in the service logic control process. Process. That is, the intelligent network service user / subscriber performs additional intelligent network services using voice or text.

The home location register (HLR) 13 performs location registration of the wireless communication terminals 11 and manages state information of the terminals 11 and knows an accurate location. That is, as a database management system that stores and manages subscriber parameters and location information for all terminals 11 registered in its own area, it manages important data such as access capability, basic services, and additional services of the terminal 11. Perform the routing function of the called subscriber.

The Short Message Service Center (SMSC) 15 is connected to the mobile communication switch 12 and plays a key role in SMS processing, sets SMS parameters, and provides a communication service identifier (TI: Teleservice Identifier) of an input signal. ) And the Destination Address are interpreted and transmitted to the network element.

The POTS / xDSL 22 is a device and a terminal capable of providing a basic voice service without additional functions such as circuit control or feature compensation for data transmission through an xDSL network.

Signaling gateway (33) is a device that serves as a gateway for implementing the existing public telephone network (PSTN) service on the next-generation communication network (NGN), converting the signal of the signal relay switch (SS7) to the IP signal of the NGN Solution to the soft switch (32).

An access gateway 35 is a device required to connect a general telephone user of a wired / wireless communication network such as a PSTN to a packet network (VoIP or VoATM), and converts voice data from the general telephone to be transmitted to the packet network.

The trunk gateway 34 is a device for interworking a public telephone network (PSTN) and a packet network (VoIP or VoATM) and transmits a large amount of data generated from the public telephone network to the packet network.

The soft switch 32, also called a media gateway controller, is a device that performs an interworking function between a packet network and an existing wired / wireless communication network. The soft switch 32 transmits signals between heterogeneous networks and performs call processing. Or a media gateway such as a trunk gateway 34 or a signal gateway 33.

Therefore, the wireless communication terminal 11 such as the existing telephones 21 and 22 or the VoIP terminal 31 connected to the Internet through the soft switch 32, a phone using a wireless LAN, a personal digital assistant (PDA), a mobile phone, or the like. In conjunction with this, it is possible to provide high quality video and voice calls and multimedia supplementary services regardless of the type of terminal.

SIP Application Server 36 functions to manage and control call resources to process services.

The media server 37 is a system for processing special resources such as Tone, Announcement, Conference Call Bridge Management, TTS, etc. which are required in the service logic control process. However, the difference from the IP 25 for the existing PSTN is that it provides a special resource required for packet-based service logic control in conjunction with the soft switch 32 of the NGN. In addition, it provides special resources such as video stream which is needed for NGN's multimedia-based additional service in the future.

Now, the 'alternate video service' procedure will be described in more detail. However, the service user is assumed to be registered in the "alternate video service" by connecting to a wired / wireless Internet connection such as a web or a WAP or an ARS.

2 is a flowchart illustrating an alternative video service method according to an embodiment of the present invention, and illustrates a procedure of a substitute video service subscriber transmitting a substitute video to a called terminal (a video telephone terminal) when a call is originated.

First, the alternative video service subscriber (calling terminal A) attempts to call any called party (here, a caller who is not subscribed to the alternative video service) (called terminal B) to call the SIP application server 36 at the calling terminal A. If the SDP (Session Description Protocol) of the calling terminal is set to transmit the message "INVITE (SDP A)" (S201), the SIP application server 36 sends "INVITE (no SDP)" to the destination terminal B without SDP information. Send a message (202).

In response, the called terminal B transmits the incoming response 100 Trying and the ring response 180 Ring to the SIP application server 36 (203, 204).

If the called party responds (hook-off), the called terminal B sets the SDP of the called terminal to the SIP application server 36 and transmits a "200 OK (SDP B)" message (205).

Then, the SIP application server 36 checks the SDP information of the "200 OK" message to confirm whether the destination terminal B supports the video (206).

As a result of the check, when the called terminal B only supports voice (i.e., not a video telephone terminal), the SIP application server 36 sends the SDP information of the "200 OK" message to the called terminal B (the calling terminal A). Set to audio and video (sendOnly) (200 OK (SDP B (send, video))] (207).

As a result of the check, when the called terminal B supports not only audio but also video (that is, a video telephone terminal), the SIP application server 36 receives the SDP information of the "200 OK" message to the caller (the calling terminal A). It sets and transmits the SDP information of the terminal B [200 OK (SDP B)] (208).

In response to the 200 OK (SDP B (sendOnly)) 207 or 200 OK (SDP B) 208, the originating terminal A confirms that the message has been received by the SIP application server 36. ACK "message is sent (209).

In contrast, if the called terminal B is a terminal supporting only voice (that is, not a video telephone terminal), the SIP application server 36 transmits the " ACK " message to the called terminal B as it is (210).

However, if the called terminal B supports not only audio but also video (i.e., a video telephone terminal), the SIP application server 36 connects to the media server 37 to transmit the alternate video to the called terminal B. The message " INVITE " is transmitted to the media server 37 (211). In response, the media server 37 sends a "200 OK" message to the SIP application server 36 (212), and the SIP application server 36 sends an "ACK" message confirming that the message has been received in response. The media server 37 transmits the data to the media server 37 (213).

Since the terminating terminal B supports the video as described above, after connecting with the media server 37 (211 to 213), the SIP application server 36 sends the SDP information of the message " INVITE (SDP A) " Verify that the calling terminal A supports the video (214).

If the calling terminal A only supports voice (i.e., not a video telephone terminal), the SDP information of the "ACK" message is set to the calling terminal A (voice and video (receiveOnly)) and sent to the called terminal B. [ACK (SDP A (Voice + Video)] 215.

As a result, when the calling terminal A supports not only audio but also video (that is, a video telephone terminal), the SDP information of the "ACK" message is transmitted to the called terminal B with the SDP information of the calling terminal A as it is (216). ). Subsequently, when the SIP application server 36 sets the substitute video in the PlayAnnouncement (PA) of the INFO message and transmits it to the media server 37 (i.e., sends a substitute video transmission command) (217), the media responds thereto. The server 37 transmits the message " 200 OK " to the SIP application server 36 (218), and provides the destination terminal B with an image (still image and a video) designated by the caller (service subscriber) (219).

As such, if the called terminal B does not support the video and the calling terminal A does not support the video (both the calling terminal A and the called terminal B are not the video telephone terminals), "Step 207 → Step 209 → Step 210 → 215 Step ", only the voice call is performed between the calling / calling terminal.

In addition, when the called terminal B does not support the video and only the calling terminal A supports the video (that is, the called terminal B is not the video telephone terminal and only the calling terminal A is the video telephone terminal). → step 210 → step 215, only the voice call is performed between the calling / calling terminal.

However, if called terminal B supports video and calling terminal A does not support video (i.e., calling terminal A is not a video telephone terminal and only called terminal B is a video telephone terminal), " step 208 → step 209 → 211. In step 213 to step 215 to 217 to step 218, not only the voice call between the calling / calling terminal but also the video (still image, video) designated by the caller (service subscriber) to the called terminal B (219). .

On the other hand, if the called terminal B supports video and the calling terminal A also supports video (if both the calling terminal A and the called terminal B are video telephone terminals), step 208 → step 209 → steps 211 to 213 → 216 to 218 In step 219, not only the voice call between the calling / calling terminal but also the video (still image, video) designated by the caller (service subscriber) to the called terminal B (219).

When the calling terminal A and the called terminal B are in a busy state (voice call or voice and video call), when the call is terminated at the calling terminal A, the " BYE " message is transmitted to the SIP application server 36 (220). The SIP application server 36 transmits a "200 OK" message to the calling terminal A in response (221). In addition, the SIP application server 36 transmits a "BYE" message to the destination terminal B to terminate the call (222), and receives a "200 OK" message in response thereto (223).

Here, in the busy state, it is assumed that the call is terminated at the calling terminal A, but when the call is terminated first at the called terminal B, the SIP application server 36 transmits a "BYE" message to the calling terminal A to make a call. You can also terminate.

When the destination terminal B supports the video, the media server 37 is interlocked. Therefore, to release the resource, the SIP application server 36 sends a "BYE" message to the media server 37 transmitting the replacement video to the destination terminal B. The call is sent to terminate the call (224), and a "200 OK" message is received in response (225).

3 is a flowchart of another embodiment of an alternative video service method according to the present invention, and a procedure of transmitting an alternative video to an originating terminal (that is, an image phone terminal) when an alternative video service subscriber receives a call.

First, an arbitrary caller (assuming a caller who is not subscribed to the alternative video service) (calling terminal A) attempts to call the alternative video service subscriber (called terminal B) so that the SIP application server 36 at the calling terminal A. If the SDP (Session Description Protocol) of the calling terminal is set to transmit the message " INVITE (SDP A) " (301), the SIP application server 36 sends " INVITE (no SDP) " Send a message (302).

In response to this, the called terminal B transmits the incoming response 100 Trying and the ring response 180 Ring to the SIP application server 36 (303 and 304).

If the called party responds (hook-off), the called terminal B sets the SDP of the called terminal to the SIP application server 36 and transmits a "200 OK (SDP B)" message (305).

Then, the SIP application server 36 checks the SDP information of the "200 OK" message to confirm whether the destination terminal B supports the video (306).

As a result of the check, when the called terminal B only supports voice (i.e., not a video telephone terminal), the SIP application server 36 sends the SDP information of the "200 OK" message to the called terminal B (the calling terminal A). Audio and video (sendOnly) to be transmitted (200 OK (SDP B (send, only))] (307).

As a result of the check, when the called terminal B supports not only audio but also video (that is, a video telephone terminal), the SIP application server 36 receives the SDP information of the "200 OK" message to the caller (the calling terminal A). Set by the SDP information of the terminal B and transmit it (200 OK (SDP B)) 308.

In response to the 200 OK (SDP B (sendOnly)) 307 or 200 OK (SDP B) 308, the originating terminal A confirms that the message has been received by the SIP application server 36. ACK "message is sent (309).

Subsequently, the SIP application server 36 checks SDP information of the message " INVITE (SDP A) " sent from the first calling terminal A and checks whether the calling terminal A supports video (310).

If the calling terminal A only supports voice (i.e., not a video telephone terminal), the SDP information of the " ACK " message is transmitted to the called terminal B with the SDP information of the calling terminal A as it is. )] (311).

As a result of the check, when the calling terminal A supports not only voice but also video (that is, a video telephone terminal), the SIP application server 36 connects with the media server 37 to transmit the replacement video to the calling terminal A. In step 312, the message " INVITE " In response, the media server 37 sends a "200 OK" message to the SIP application server 36 (313), and the SIP application server 36 sends a "ACK" message confirming that the message has been received in response. And transmits to media server 37 (314). Then, the SIP application server 36 sets the SDP information of the "ACK" message to the calling terminal A (voice, video) and sends it to the called terminal B (ACK (SDP A (voice + video)). ] (315).

Subsequently, when the SIP application server 36 sets the substitute video in the PlayAnnouncement (PA) of the INFO message and transmits it to the media server 37 (i.e., sends a substitute video transmission command) (316), the media in response thereto. The server 37 transmits the message " 200 OK " to the SIP application server 36 (317), and provides an image (still image, video) designated by the called party (service subscriber) to the calling terminal A (318).

In this way, if the called terminal B does not support the video and the calling terminal A does not support the video (both the calling terminal A and the called terminal B are not video telephone terminals), " step 307 → step 309 → step 311 " After that, only the voice call is performed between the calling / calling terminal.

However, if the called terminal B does not support the video and only the calling terminal A supports the video (that is, the called terminal B is not the video telephone terminal and only the calling terminal A is the video telephone terminal), " step 307 → step 309 → 312. Through step 317, the caller terminal A provides the caller (the service subscriber) an image (still image, a video) designated by the called terminal A (318).

If the called terminal B supports the video but the calling terminal A does not support the video (i.e., the calling terminal A is not the video telephone terminal and only the called terminal B is the video telephone terminal), " Step 308 → Step 309 → 311. Step ", only the voice call is performed between the calling / calling terminal.

On the other hand, if the called terminal B supports the video and the calling terminal A also supports the video (when both the calling terminal A and the called terminal B are the video telephone terminals), the call is sent through step 308 → step 309 → steps 312 to 317. In operation 318, the terminal A provides an image (still image, a video) designated by the called party (service subscriber).

When the calling terminal A and the called terminal B are in a busy state (voice call or voice and video call), when the call is terminated at the calling terminal A, the " BYE " message is transmitted to the SIP application server 36 (319), The SIP application server 36 transmits the message "200 OK" to the calling terminal A in response (320). Then, the SIP application server 36 transmits a "BYE" message to the destination terminal B to terminate the call (321), and receives a "200 OK" message in response (322).

Here, in the busy state, it is assumed that the call is terminated at the calling terminal A, but when the call is terminated first at the called terminal B, the SIP application server 36 transmits a "BYE" message to the calling terminal A to make a call. You can also terminate.

When the destination terminal B supports the video, the media server 37 is interlocked. Therefore, the SIP application server 36 sends a "BYE" message to the media server 37 which is transmitting the replacement video to the calling terminal A. The call is sent to terminate the call (323), and a "200 OK" message is received in response (324).

4A and 4B are flowcharts of still another embodiment of an alternative video service method according to the present invention, and illustrates a procedure of transmitting an alternative video when both the caller and the called party are subscribers of the alternative video service.

First, a caller (originating terminal A) subscribed to an alternative video service attempts to call an alternative video service subscriber (receiving terminal B) to establish a Session Description Protocol (SDP) of the calling terminal from the calling terminal A to the SIP application server 36. When setting and transmitting an "INVITE (SDP A)" message (401), the outgoing SIP application server 36-1 should send a "INVITE (no SDP)" message without SDP information to the destination terminal B. Since it is an alternative video service subscriber, the " INVITE (no SDP) " message without SDP information is sent to the called SIP application server 36-2 (402), and the called SIP application server 36-2 sends an SDP to the called terminal B. The message "INVITE (no SDP)" having no information is transmitted (403).

In contrast, the called terminal B transmits the incoming response 100 Trying and the ring response 180 Ring to the incoming SIP application server 36-2 (404 and 405).

If the called party responds (hook-off), the called terminal B sets the SDP of the called terminal to the called SIP application server 36-2 and transmits a "200 OK (SDP B)" message (406).

Then, the incoming SIP application server 36-2 checks the SDP information of the "200 OK" message to confirm whether the destination terminal B supports the video (407).

As a result of confirmation, when the called terminal B supports only voice (i.e., not a video telephone terminal), the called SIP application server 36-2 sends an SDP of "200 OK" message to the calling SIP application server 36-1. The information is set to the destination terminal B (voice, video) and transmitted (200 OK (SDP B (voice, video))] 408.

As a result of the check, when the called terminal B supports not only voice but also video (that is, a video telephone terminal), the called SIP application server 36-2 sends "200 OK" to the calling SIP application server 36-1. The SDP information of the message is set as the SDP information of the destination terminal B, and transmitted (200 OK (SDP B)) (409).

Then, the originating SIP application server 36-1 checks the SDP information of the "200 OK" message to confirm whether the called terminal B supports video (410), and if the called terminal B supports only voice (i.e., video). If not, the SDP information of the "200 OK" message is set to the calling terminal B (voice and video) and sent to the caller (calling terminal A) [200 OK (SDP B (voice, video ( sendOnly))] 411. However, when the called terminal B supports not only audio but also video (i.e., a video telephone terminal), the calling SIP application server 36-1 is called the sender (sending terminal A). SDP information of the " 200 OK " message is set as SDP information of the called terminal B and transmitted (200 OK (SDP B)) (412).

In response to the 200 OK (SDP B (sendOnly)) 411 or 200 OK (SDP B) 412, the originating terminal A receives a message to the originating SIP application server 36-1. The message " ACK "

On the other hand, if the called terminal B is a terminal supporting only voice (that is, not a video telephone terminal), the calling SIP application server 36-1 sends an "ACK" message to the called SIP application server 36-2. Is transmitted as it is (414).

However, if the called terminal B supports not only audio but also video (i.e., a video telephone terminal), the calling SIP application server 36-1 sends the media server 37 to transmit the replacement video to the called terminal B. And transmits the message " INVITE " to the media server 37 for connection (415). In response, the media server 37 sends a "200 OK" message to the originating SIP application server 36-1 (416) and the originating SIP application server 36-1 confirms that it has received the message in response. The message ACK is transmitted to the media server 37 (417).

Since the terminating terminal B supports the video as described above, after connecting to the media server 37 (415 to 417), the originating SIP application server 36-1 sends the message " INVITE (SDP A) " Check the SDP information of the check whether the calling terminal A supports the video (418).

As a result, if the calling terminal A only supports voice (i.e., not a video telephone terminal), the SDP information of the "ACK" message is set to the calling terminal A (voice, video (receiveOnly)) and the incoming SIP application server ( 36-2) (ACK (SDP A (voice + video))] (419).

As a result of the check, when the calling terminal A supports not only voice but also video (that is, a video telephone terminal), the called SIP application server 36-2 uses the SDP information of the "ACK" message as it is. (420). Subsequently, when the originating SIP application server 36-1 sets the substitute video in the PlayAnnouncement (PA) of the INFO message and transmits it to the media server 37 (i.e., sends a substitute video transmission command) 421 In response, the media server 37 transmits a "200 OK" message to the calling SIP application server 36-1 (422), and provides the called terminal (service subscriber) with the video (still video, video) designated by the caller (service subscriber). (423).

Meanwhile, the called SIP application server 36-2 checks the SDP information of the message " INVITE (SDP A) " sent from the first calling terminal A and checks whether the calling terminal A supports video (424).

If the calling terminal A only supports voice (i.e., not a video telephone terminal), the SDP information of the " ACK " message is transmitted to the called terminal B with the SDP information of the calling terminal A as it is. )] (425).

As a result of the check, when the calling terminal A supports not only voice but also video (that is, a video telephone terminal), the called SIP application server 36-2 uses a media server (S) to transmit the replacement video to the calling terminal A. And transmits the " INVITE " message to the media server 37 for connection to the server 37 (426). In response, the media server 37 sends a message " 200 OK " to the incoming SIP application server 36-2 (427) and the incoming SIP application server 36-2 confirms that it has received the message in response. Transmits the " ACK " message to the media server 37 (428). The incoming SIP application server 36-2 sets the SDP information of the "ACK" message to the calling terminal A (voice and video) and sends it to the called terminal B. [ACK (SDP A (voice + video ( recvOnly))]] (429).

Subsequently, when the incoming SIP application server 36-2 sets the substitute video in the PlayAnnouncement (PA) of the INFO message and transmits it to the media server 37 (that is, sends a substitute video transmission command) (430), In response, the media server 37 transmits a "200 OK" message to the terminating SIP application server 36-2 (431), and provides an image (still image, video) designated by the called party (service subscriber) to the calling terminal A. (432).

As such, if the called terminal B does not support the video and the calling terminal A does not support the video (both the calling terminal A and the called terminal B are not the video telephone terminals), step 408 → step 411 → step 413 → 414 Step → step 425, only the voice call is performed between the calling / calling terminal.

However, if called terminal B does not support video and only calling terminal A supports video (i.e., called terminal B is not a video telephone terminal and only calling terminal A is a video telephone terminal), " Step 408 → Step 411 → 413. " In step 414 to step 426 to 431, a video (still image and a moving image) designated by the called party (service subscriber) is provided to the calling terminal A (432).

If the called terminal B supports the video but the calling terminal A does not support the video (i.e., the calling terminal A is not the video telephone terminal and only the called terminal B is the video telephone terminal), " step 409 → step 412 → 413. In step 415 to step 417 to step 419 to step 421 to step 422, an image (still image and a moving image) designated by the caller (service subscriber) is provided to the called terminal B (423).

On the other hand, if the called terminal B supports the video and the calling terminal A also supports the video (when both the calling terminal A and the called terminal B are the video telephone terminals), step 409 → step 412 → step 413 → steps 415 to 417 → In step 420 to 422 ", the caller (service subscriber) provides the designated image (still image, video) to the called terminal B (423), and goes back to" step 426 to 431 "to the called terminal A The service subscriber) provides the designated image (still image, moving image) (432).

When the calling terminal A and the called terminal B are busy (voice call or voice and video call), when the call is terminated at the calling terminal A, the " BYE " message is sent to the calling SIP application server 36-1 ( 433, the originating SIP application server 36-1 transmits a "200 OK" message to the originating terminal A in response (434). The originating SIP application server 36-1 transmits a message "BYE" to the terminating SIP application server 36-2 (435), and the terminating SIP application server 36-2 responds with "200 OK" in response thereto. Message 436 to the originating SIP application server 36-1.

Thereafter, the called SIP application server 36-2 transmits a "BYE" message to the called terminal B to terminate the call (437), and receives a "200 OK" message from the called terminal B in response thereto. 438).

Here, in the busy state, it is assumed that the call is terminated at the calling terminal A, but when the call is terminated first at the called terminal B, the incoming / outgoing SIP application servers 36-1 and 36-2 receive a "BYE" message. The call may be sent to the calling terminal A to terminate the call.

When the calling terminal A or the calling terminal B or the calling terminal A and the calling terminal B simultaneously support the video, the media server 37 is linked to each other. Therefore, the calling / incoming SIP application server 36-1, 36-2 is used to release resources. ) Transmits the message "BYE" to the media server 37 which is simultaneously transmitting the replacement video to the calling terminal A or the called terminal B or the calling terminal A and the called terminal B to terminate the call (439, 441), and responds to the call. Receive a "200 OK" message (440,442).

In the above, it is assumed that an example of separately configuring an incoming / outgoing SIP application server 36-1 and 36-2 is performed. However, since it is possible to simultaneously perform outgoing / incoming function in one SIP application server 36, an integrated configuration thereof may be performed. It is possible.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention as described above, when a person or a company using a video telephone terminal (video terminal) to make and receive a call, instead of their own image information, still images or videos such as avatars, animations, etc., corporate advertising, etc. There is an effect that can deliver the still image or video of the caller / called party.

In particular, the present invention can provide a still image or a video designated by the user (personal or corporate) even when the service subscriber himself does not have a video telephone terminal (video terminal) and the other party has a video telephone terminal. It works.

Claims (22)

In the video service method in a communication system, A service registration step of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a SDP (Session Description Protocol) information of a called terminal as the SIP application server makes a call to a corresponding called number and responds to an incoming call when the calling subscriber calls; A first checking step, wherein the SIP application server checks SDP information of the called terminal to check whether the called terminal supports video; As a result of the first checking, if the called terminal supports video, the SIP application server notifies the calling terminal of SDP information of the called terminal, establishes a connection with a media server, and then checks the SDP information of an outgoing signal. A second checking step of checking whether the terminal supports the image; And As a result of the second check, if the calling terminal does not support the video, the SIP application server informs the called terminal by changing the SDP information [receiveOnly] , and if the calling terminal supports the video, An image providing step of notifying SDP information to the called terminal and providing the video to the called terminal through the media server; Alternative video service method in a communication system comprising a. The method of claim 1, If the called terminal does not support the video as a result of the first checking, the SIP application server notifies the video of [sendOnly] the calling terminal by changing the SDP information and transmits the response to the called terminal. Alternative video service method in a communication system further comprising. In the video service method in a communication system, A service registration step of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; When a call is made to the called subscriber, the SIP application server calls the called party. Call receiving step for receiving SDP (Session Description Protocol) information of the called terminal in response to the incoming call; A first checking step, wherein the SIP application server checks SDP information of the called terminal to check whether the called terminal supports video; If the called terminal does not support the video, the SIP application server notifies the [sendOnly] calling terminal by changing the SDP information; If the called terminal supports video, the SIP application server notifying the calling terminal of SDP information of the called terminal; A second checking step of checking, by the SIP application server, SDP information of an outgoing signal to determine whether the calling terminal supports video; And As a result of the second check, if the calling terminal supports video, after establishing a connection with a media server, the SDP information is changed and informed to the called terminal [receiveOnly] , and the calling terminal through the media server. Image providing step of providing the image to the Alternative video service method in a communication system comprising a. The method of claim 3, wherein If the calling terminal does not support the video as a result of the second check, the SIP application server notifying the called terminal of SDP information of the calling terminal; Alternative video service method in a communication system further comprising. In the video service method in a communication system, A service registration step of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the receiver terminal supports the video by checking the SDP information of the called terminal; and checking the SDP information of the outgoing signal to confirm whether the video is supported by the calling terminal; And As a result of the check, if the called terminal supports video and the calling terminal does not support video, the application server informs the calling terminal of SDP information of the called terminal, connects a media server, and then through the media server. Providing a first image to the called terminal; Alternative video service method in a communication system comprising a. In the video service method in a communication system, A service registration step of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the video is supported by the called terminal by checking the SDP information of the called terminal; and checking whether the video is supported by the calling terminal by checking the SDP information of the calling signal; And As a result of the check, if the called terminal does not support the video and the calling terminal supports the video, the called SIP application server informs the calling terminal by changing the SDP information [sendOnly] and connects the media server. A first image providing step of changing the SDP information and informing the called terminal to the called terminal and supporting the image to the calling terminal through the media server; Alternative video service method in a communication system comprising a. In the video service method in a communication system, A service registration step of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the receiver terminal supports the video by checking the SDP information of the called terminal; and checking the SDP information of the outgoing signal to confirm whether the video is supported by the calling terminal; And As a result of the check, if the calling / called terminal supports the video, the application server informs the calling terminal of the SDP information of the called terminal, establishes the connection with the media server, and then connects the called through the media server. Providing the video to the terminal, changing the SDP information [ReceiveOnly] to inform the called terminal and the first video providing step of providing the video to the calling terminal through the media server Alternative video service method in a communication system comprising a. The method according to any one of claims 5 to 7, As a result of the check, if the caller / receiver terminal does not support the video, the SIP application server changes the SDP information to inform [sendOnly] the calling terminal, and the SDP information of the calling terminal to the called terminal. Informing Alternative video service method in a communication system further comprising. The method according to any one of claims 1 to 7, The resource release step of providing the video to the called terminal during a call, and disconnecting the connection with the media server by the SIP application server at the end of the call. Alternative video service method in a communication system further comprising. The method according to claim 5 or 7, As a result of the check, if the called terminal does not support the video and the calling terminal supports the video, the called SIP application server changes the SDP information to inform the calling terminal of [sendOnly] and informs the media server. A second image providing step of changing the SDP information and informing the called terminal to the called terminal and supporting the image to the calling terminal through the media server. Alternative video service method in a communication system further comprising. The method according to claim 5 or 6, As a result of the check, if the calling / called terminal supports the image, the application server informs the calling terminal of the SDP information of the called terminal, establishes a connection with the media server, and then connects to the called terminal through the media server. Providing the video, changing the SDP information [receiveOnly] to inform the called terminal and the second video providing step of providing the video to the calling terminal through the media server Alternative video service method in a communication system further comprising. The method according to claim 6 or 7, As a result of the check, if the called terminal supports the video and the calling terminal does not support the video, the application server informs the calling terminal of the SDP information of the called terminal, connects the media server to the media server. Providing a second image to the called terminal through the second image Alternative video service method in a communication system further comprising. In the video service method in a communication system, A service registration step of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving step of receiving a Session Description Protocol (SDP) information of a called terminal according to an incoming call when the SIP application server calls the called party's called number when the calling subscriber calls; Confirming, by the SIP application server, whether the receiver terminal supports the video by checking the SDP information of the called terminal; and checking the SDP information of the outgoing signal to confirm whether the video is supported by the calling terminal; As a result of the check, if the calling / receiving terminal does not support the video, the called SIP application server changes the SDP information and sends [sendOnly] to the calling terminal and informs the SDP information of the calling terminal. Notifying to the terminal; As a result of the check, if the called terminal supports video and the calling terminal does not support video, the application server informs the calling terminal of SDP information of the called terminal, connects a media server, and then through the media server. Providing a first image to the called terminal; As a result of the check, if the called terminal does not support the video and the calling terminal supports the video, the called SIP application server changes the SDP information to inform the calling terminal of [sendOnly] and informs the media server. Providing a second image by changing the SDP information after establishing a connection and informing the called terminal to the called terminal and supporting the image to the calling terminal through the media server; And As a result of the check, if the calling / called terminal supports the image, the application server informs the calling terminal of the SDP information of the called terminal, establishes a connection with the media server, and then connects to the called terminal through the media server. A third image providing step of providing the image, changing the SDP information to inform the receiving terminal of the image (receiveOnly) and providing the image to the calling terminal through the media server; Alternative video service method in a communication system comprising a. The method according to claim 1 or 2, The second confirmation step, If the called terminal supports not only voice but also video according to the result of the checking of the first checking step, the SIP application server sends the SDP information of the "200 OK" message to the calling terminal as the SDP information of the called terminal. Setting and transmitting; Transmitting an "ACK" message confirming that the calling terminal has received the message to the SIP application server; The SIP application server sends an "INVITE" message to the media server for connection with the media server to transmit the replacement video to the called terminal, whereby the media server sends a "200 OK" message to the SIP application server. Transmitting a "ACK" message to the media server confirming that the SIP application server has received the message in response thereto; And Confirming whether the calling terminal supports video by checking the SDP information of the "INVITE" message sent from the calling terminal by the SIP application server; Alternative video service method in a communication system comprising a. The method of claim 14, The image providing step, In response to the verification result of the second verification step, when the calling terminal supports only voice, setting SDP information of an "ACK" message as the calling terminal (voice, video) and transmitting it to the called terminal. ; In response to the verification result of the second verification step, when the calling terminal supports not only voice but also video, transmitting the SDP information of the "ACK" message to the called terminal with the SDP information of the calling terminal as it is; And The SIP application server sets the replacement video to PA (PlayAnnouncement) of the INFO message and transmits it to the media server (that is, to send a replacement video transmission command). In response, the SIP server sends a "200 OK" message. Transmitting to a SIP application server and providing an image (still image, video) designated by a caller (service subscriber) to the called terminal; Alternative video service method in a communication system comprising a. The method according to claim 3 or 4, The image providing step, According to the confirmation result of the second verifying step, when the calling terminal supports not only audio but also video, the SIP application server connects to the media server to transmit an alternative video to the calling terminal. Transmitting a message to the media server, receiving a “200 OK” message from the media server, and transmitting an “ACK” message to the media server confirming that the message has been received in response thereto; Setting, by the SIP application server, SDP information of an "ACK" message to the calling terminal (voice, video) and transmitting it to the called terminal; And The SIP application server sets the replacement video to PA (PlayAnnouncement) of the INFO message and transmits it to the media server (that is, to send a replacement video transmission command). In response, the SIP server sends a "200 OK" message. Transmitting to a SIP application server and providing an image (still image, video) designated by a called party (service subscriber) to the calling terminal; Alternative video service method in a communication system comprising a. The method of claim 5 or 13, The SIP application server can be separated from the incoming / outgoing function, The process of transmitting the image to the called terminal by separating the calling / incoming function is performed. When the called terminal supports not only voice but also video, setting, by the called SIP application server, the SDP information of the "200 OK" message as the SDP information of the called terminal to the calling SIP application server; When the called terminal supports not only voice but also video, the calling SIP application server sets and sends the SDP information of the "200 OK" message to the calling terminal as the SDP information of the called terminal. Receiving an "ACK" message confirming receipt of the message from the calling terminal; If the called terminal supports not only audio but also video, the originating SIP application server transmits an "INVITE" message to the media server to connect to the media server to transmit a substitute video to the called terminal. Receiving a "200 OK" message from the media server and transmitting a "ACK" message to the media server confirming that the message has been received in response; If the calling terminal supports only voice, setting, by the SIP application server, SDP information of an "ACK" message as the calling terminal (voice, video) and transmitting it to the called SIP application server; And The originating SIP application server sets the replacement video to PA (PlayAnnouncement) of the INFO message and transmits it to the media server (i.e., sends a replacement video transmission command). In response, the media server sends a "200 OK" message. Transmitting to the originating SIP application server and providing an image (still image, video) designated by the caller (service subscriber) to the called terminal B; Alternative video service method in a communication system comprising a. The method of claim 6 or 13, The SIP application server can be separated from the incoming / outgoing function, The process of transmitting the video to the calling terminal by separating the calling / incoming function When the called terminal supports only voice, transmitting, by the called SIP application server, SDP information of the "200 OK" message to the called terminal (sendOnly) to the calling SIP application server; If the called terminal supports only voice, the calling SIP application server sets SDP information of the "200 OK" message to the calling terminal A and sends it to the called terminal (voice, video, sendOnly), and responds. Receiving an "ACK" message confirming receipt of the message from the calling terminal; When the called terminal is a terminal supporting only voice, transmitting the "ACK" message to the called SIP application server by the calling SIP application server; When the calling terminal supports not only voice but also video, the called SIP application server transmits an "INVITE" message to the media server to connect to the media server to transmit a substitute video to the calling terminal. Receiving a "200 OK" message from the server, and transmitting an "ACK" message to the media server confirming that the message has been received in response; Setting, by the called SIP application server, SDP information of an "ACK" message as the calling terminal (voice, video) and transmitting the SDP information to the called terminal; And The incoming SIP application server sets the replacement video to PA (PlayAnnouncement) of the INFO message and transmits it to the media server (i.e., sends a replacement video transmission command). In response, the media server sends a "200 OK" message. Transmitting to the called SIP application server and providing an image (still image, video) designated by the called party (service subscriber) to the calling terminal; Alternative video service method in a communication system comprising a. The method according to claim 7 or 13, The SIP application server can be separated from the incoming / outgoing function, The process of transmitting the image to the calling / calling terminal by separating the calling / calling function is performed. When the called terminal supports not only voice but also video, setting, by the called SIP application server, SDP information of the "200 OK" message as the SDP information of the called terminal to the calling SIP application server; When the called terminal supports not only voice but also video, the calling SIP application server sets and sends the SDP information of the "200 OK" message to the calling terminal as the SDP information of the called terminal. Receiving an "ACK" message confirming receipt of the message from the calling terminal; When the called terminal supports not only voice but also video, the originating SIP application server transmits an "INVITE" message to the media server to connect to the media server in order to transmit a substitute video to the called terminal. Receiving a "200 OK" message from the media server and transmitting a "ACK" message to the media server confirming that the message has been received in response thereto; When the calling terminal supports not only voice but also video, transmitting the SDP information of the "ACK" message to the called SIP application server by using the SDP information of the calling terminal as it is; The originating SIP application server sets the replacement video to PA (PlayAnnouncement) of the INFO message and transmits it to the media server (i.e., sends a replacement video transmission command). In response, the media server sends a "200 OK" message. Transmitting to the originating SIP application server and providing an image (still image, a video) designated by a caller (service subscriber) to the called terminal; When the calling terminal supports not only voice but also video, the called SIP application server transmits an "INVITE" message to the media server to connect to the media server to transmit a substitute video to the calling terminal. Receiving a "200 OK" message from the media server and transmitting a "ACK" message to the media server confirming that the message has been received in response; Setting, by the called SIP application server, SDP information of an "ACK" message as the calling terminal (voice, video) and transmitting the SDP information to the called terminal; And The incoming SIP application server sets the replacement video to PA (PlayAnnouncement) of the INFO message and transmits it to the media server (i.e., sends a replacement video transmission command). In response, the media server sends a "200 OK" message. Transmitting to the called SIP application server and providing an image (still image, video) designated by the called party (service subscriber) to the calling terminal; Alternative video service method in a communication system comprising a. In a communication system having a processor for an alternative video service, A service registration function of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving function that receives the SDP (Session Description Protocol) information of the called terminal as the SIP application server calls the called party number and responds to the incoming call when the calling subscriber calls; A first verification function, wherein the SIP application server checks SDP information of the called terminal to confirm whether the called terminal supports video; If the called terminal does not support video as a result of the first checking, the SIP application server notifies the [sendOnly] calling terminal by changing the SDP information and transmits a response to the called terminal; As a result of the first checking, if the called terminal supports video, the SIP application server notifies the calling terminal of SDP information of the called terminal, establishes a connection with a media server, and checks the SDP information of the calling signal. A second checking function for checking whether the calling terminal supports video; And As a result of the second check, if the calling terminal does not support the video, the SIP application server informs the called terminal by changing the SDP information [receiveOnly] , and if the calling terminal supports the video, Image providing function of notifying SDP information to the called terminal and providing the video to the called terminal through the media server. A computer-readable recording medium having recorded thereon a program for realizing this. In a communication system having a processor for an alternative video service, A service registration function of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving function for receiving a SDP (Session Description Protocol) information of a called terminal as the SIP application server makes a call to the called number and responds to a call when the call is made to the called subscriber; A first verification function, wherein the SIP application server checks SDP information of the called terminal to confirm whether the called terminal supports video; A function of notifying the [sendOnly] calling terminal of the SIP application server by changing the SDP information if the called terminal does not support the video as a result of the first checking; A function of notifying the calling terminal of SDP information of the called terminal by the SIP application server if the called terminal supports a video as a result of the first checking; A second checking function of the SIP application server to check whether the calling terminal supports the video by checking the SDP information of the calling signal; If the calling terminal does not support the video as a result of the second checking, the SIP application server notifying the called terminal of SDP information of the calling terminal; And As a result of the second check, if the calling terminal supports video, after establishing a connection with a media server, the SDP information is changed and informed to the called terminal [receiveOnly] , and the calling terminal through the media server. Image providing function to provide the image to the A computer-readable recording medium having recorded thereon a program for realizing this. In a communication system having a processor for an alternative video service, A service registration function of registering an 'alternate video service' subscription capable of transmitting a desired image during a call and registering an image to be transmitted during a call from a corresponding service subscriber; A call receiving function for receiving a SDP (Session Description Protocol) information of a called terminal as the SIP application server makes a call to the called party's called number when the calling subscriber makes a call; A confirmation function of the SIP application server to check whether the receiver terminal supports the video by checking the SDP information of the called terminal, and to check whether the calling terminal supports the video by checking the SDP information of the outgoing signal; As a result of the check, if the calling / called terminal does not support the video, the called SIP application server changes the SDP information to inform the calling terminal of [sendOnly] and informs the calling terminal of the SDP information of the calling terminal. Informing function; As a result of the check, if the called terminal supports video and the calling terminal does not support video, the application server informs the calling terminal of SDP information of the called terminal, connects a media server, and then through the media server. A first image providing function of providing the image to the called terminal; As a result of the check, if the called terminal does not support the video and the calling terminal supports the video, the called SIP application server changes the SDP information to inform the calling terminal of [sendOnly] and informs the media server. A second video providing function of changing the SDP information after informing the connection and informing the called terminal to the called terminal and supporting the video to the calling terminal through the media server; And As a result of the check, if the calling / called terminal supports the image, the application server informs the calling terminal of the SDP information of the called terminal, establishes a connection with the media server, and then connects to the called terminal through the media server. A third video providing function of providing the video, changing the SDP information to inform the receiving terminal of the video (receiveOnly) , and providing the video to the calling terminal through the media server. A computer-readable recording medium having recorded thereon a program for realizing this.

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