KR100210393B1 - Method of establishing the environment of telephone calls in the system with a visual telephone - Google Patents

Abstract

The present invention relates to a call environment setting method in a system having a video telephone service function, comprising: a call request signal transmitting step including a requestor ID and a responder ID; Determining whether the requestor ID and the responder ID are in the subscriber list; A responder receiving the call request signal; Requestor ID extraction step; Reading a call list; Determining whether the requestor's ID is in the call list; Setting the call environment to the voice mode; Reading a level according to the requestor's ID; Setting a call environment into a still picture mode, a moving picture mode, or a real picture mode, respectively; Setting the call environment to the voice mode; Call initiation step; Delivering call information including a real picture to a call requester; Call initiation step; Turning off the video input / output device; Delivering call information that is not a real picture to a call requester; Determining whether the call environment is changed; Changing the call environment; And ending the call environment setting process after the call is continued, and according to the present invention as described above, by setting various call environments according to the ID of the call requester, the actual appearance and other information of the call responder are unnecessary to the requester. It is effective to prevent exposure.

Description

Call environment setting method in system with video call service

1 is a flowchart illustrating a conventional call progress in a system having a video telephony service function.

2 is a conceptual diagram showing a reference model of the Digital Audio Visual Council (DAVIC) system.

3 is a block diagram showing a system device among the DAVIC system reference models.

4 is a configuration block diagram schematically showing an entire system of a video telephony service.

5 is a block diagram showing the configuration of a subscriber station having a video telephone service function applied to the present invention.

6 is a flowchart illustrating a call environment setting method in a system having a video telephony service function according to the present invention.

* Explanation of symbols for main parts of the drawings

400: network connection device 410: tuner

420: demodulator 430: decryption unit

440: interactive communication unit 500: set-top device

505: demultiplexer 510: audio decoder

515: video decoder 520: video memory

525: central processing unit 530: memory

535: direct memory access control unit 540: graphic generation unit

541 graphic information control unit 542 graphic memory

543: NTSC coder 545: decryption unit

550: high frequency conversion unit 555: transmission unit

560: power supply unit 565: remote control

600: audio input / output device 650: video input / output device

The present invention relates to a method for setting a call environment, and in particular, by setting various call environments according to an identifier (hereinafter referred to as an ID) of a call requestor in a system having a video telephone service function, the actual appearance and other information of the call responder The present invention relates to a method for setting a call environment in a system having a video telephone service function to prevent unnecessary exposure to a requestor.

The opening of the Information Super Highway in the future is expected to increase the demand for a new service capable of bi-directional communication of video and data in addition to the existing voice communication service. The most basic service among the new services is a video telephone service.

Since the video telephone service must transmit a large amount of video signals and other data as well as an audio signal, not only a high data compression technology but also the telephone service itself is a bidirectional communication rather than a one-way communication. Technology is also a necessary service.

Accordingly, the video telephony service may be implemented through an interactive service system having a video telephony function including an advanced data compression technique and an interactive communication technique.

Unlike conventional TV or cable broadcasting system (Cable Television), interactive service is an interactive service, so that the subscriber's selection control signal is transmitted to the service provider so that the subscriber can receive the information he / she wants when desired. It is a combination.

The most representative example of such an interactive service is a video on demand (hereinafter referred to as VOD) service based on a technology based on an interactive cable broadcasting system (hereinafter referred to as I-CATV).

1 is a flowchart showing a conventional call progress in a system having a video telephony service function such as the interactive service system described above. Looking at the conventional call progress shown in Figure 1 with reference to Figure 1 as follows.

In a first step (S10), any video telephone service subscriber transmits a signal for requesting a video telephone service, an ID of the subscriber (hereinafter, the requester) and a telephone number of the other party (hereinafter, the respondent) to receive the call. Or b) to the ISDN relay station (not shown) or the service supply system 20 using the delivery system 40. Here, the above-mentioned ID should just be able to distinguish itself, such as a specific identifier, its own name, telephone number.

Subsequently, in step S20, the ISDN relay station or service supply system 20 receives the input video telephone service request signal and the requester's ID, and determines whether the requestor's ID is registered in the service subscriber list.

Accordingly, the call may be initiated or the call may be rejected according to the determination result of the second step S20 in the third step S30.

That is, in step 3-1 (S31), when the subscriber's ID is registered in the service subscriber list, the call between the requester and the responder is started.

On the other hand, in the third step (S32), if the subscriber's ID is not registered in the service subscriber list (S32), the requester is not able to receive the video telephone service, and thus cannot make a call with the respondent.

Subsequently, if the requester puts down the handset in step S40, the call ends.

However, in a system having a video telephony function, when a legitimate subscriber of a video telephony service has requested a call, the caller is called except when the respondent who receives the call request does not knowingly receive a call or cannot receive a call. Is initiated, and once the call is initiated, there is a problem that the actual appearance of the respondent and the other information are unnecessarily exposed to the subscriber who requested the call regardless of the intention of the individual.

Accordingly, the present invention is to solve the above problems, a call environment setting method in a system having a video telephone service function to set various call environment according to the caller's identifier (ID). The purpose is to provide.

In order to achieve the above object, a call environment setting method of the present invention provides a method for exchanging messages between subscribers subscribed to a server providing a video telephone service, wherein a requester sends a call request signal including a requester ID and a responder ID to the server. A first step of delivering; A second step of the server determining whether the requestor ID and the responder ID are in the subscriber list, and then transmitting a call request signal to the responder or ending all call setting procedures according to the determination result; A third step of receiving, by the responder, the call request signal; Extracting an ID of a requester from the input call request signal; A fifth step of reading a pre-stored call list; A sixth step of determining whether the requestor's ID is in the call list; A seventh step of setting the call environment to the voice mode when the ID of the requester is not in the call list as a result of the determination in the sixth step; An eighth step of reading a level according to the requester's ID when the requestor's ID is in the call list as a result of the determination in the sixth step; A ninth step of respectively setting a call environment to a stored still picture mode, a stored moving picture mode, or a real picture mode according to the read level; If there is no level according to the requester ID, transmitting an error message to the responder and setting a call environment to a voice mode; An eleventh step of initiating a call when the call environment set in the ninth step is a real picture mode; A twelfth step of transmitting call information including a real picture of the responder to a call requester; When the call environment set in the seventh step is the voice mode, or when the call environment set in the ninth step is a stored still picture mode or a stored video image, or when the call environment set in the tenth step is the voice mode, Initiating step 13; Turning off the video input / output device (14); A fifteenth step of transmitting the call information including only the stored still picture or the stored moving picture or voice of the responder to the call requester; Determining whether to change the call environment; A 17th step of changing the call environment when the call environment is to be changed as a result of the determination in step 16; And an eighteenth step in which all call environment setting processes are terminated after continuing the call for a predetermined time when the call information is transmitted to the call requester in the twelfth step or when the call environment is changed in the seventeenth step. It is characterized by.

According to the present invention as described above, by setting a variety of call environment in accordance with the ID of the call requestor in a system having a video telephone service function, the actual appearance of the call responder and other information is prevented from unnecessary exposure to the requester.

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

First, the DAVIC system reference model will be described to help understand the present invention.

The video telephone service system applied to the present invention is implemented based on the DAVIC System Reference Model (DSRM) defined by the Digital Audio Visual Council (DAVIC), a private organization.

2 is a conceptual diagram illustrating the above DAVIC system reference model. The DAVIC system reference model shown in FIG. 2 is divided into a system device (2), an information flow (4: Information Flow), a reference point (6), and an interface definition (8).

Here, the system apparatus 2 includes a service provider system (SP-1), a delivery system (DS-2-2), and a subscriber station (hereinafter referred to as STU). ).

In addition, the information flow 4 defines various types of information flowing through the DAVIC system reference model. The information flow 4 is largely divided into three aspects, a user side, a control side, and a management side.

That is, the information flow 4 includes the service content flow S1 and the service command flow S2 on the user side, the service related control flow S3 and the network related control flow S4 on the control side, and the management side. It is divided into network and service management flow (S5).

The service content flow S1 refers to an audio visual (AV) bit stream, that is, information content, transmitted in the form of an MPEC-2 transport stream. For example, movie contents and information data.

In addition, the service command flow (S2) refers to the command information for controlling the service content flow (S1) and the response information for downloading the application (Down Loading).

The service related control flow S3 performs setting or termination of a session for the service content flow S1 and the service command flow S2, and determines a quality of service (QoS). Elements, performance requirements of subscriber station 2-3, session delays, special information about basic services such as menu information, and the like.

Here, the session refers to a logical combination between two users (service provider system 2-1 or subscriber terminal 2-3) or more users, and provides a function of grouping and managing resources required to receive a certain service. .

The network related control flow (S4) is a protocol that provides a connection between the three devices (service provider system 2-1 and delivery system 2-2 and subscriber station 2-3). Finally, the network and service management flow (S5) refers to the flow of information including the connection service management requirements, and the information flow including the requirements for management of application services, session services, transport services, and the like.

Meanwhile, the reference point 6 is for interconnection between the service provider system 2-1, the delivery system 2-2, and the subscriber station 2-3, and is divided into A1 to A11 according to its function. do.

Among them, the reference point A11 (6-1) is an interface between a content provider system (not shown: a kind of program producer for providing information to the service provider system 2-1) and the delivery system 2-2. A10 (6-2) reference point defines the interface between the delivery system 2-2 and the service provider system 2-1. In addition, the A9 (6-3) reference point defines an interface between the service provider system 2-1 and the delivery system 2-2 based on Asynchronous Transfer Mode (ATM). And, the A1 (6-4) reference point defines the interface between the delivery system 2-2 and the subscriber station 2-3.

In addition, the interface definition 8 is a physical definition defined for the interconnection method between the service provider system 2-1 and the delivery system 2-2 and the subscriber station 2-3.

3 is a block diagram schematically illustrating a system device among the DAVIC system reference models of FIG. 3. The system device shown in FIG. 3 is composed of a service provider system 20, a delivery system 40, and a subscriber station 60.

Here, the service provider system 20 includes a content service unit 21, an application service unit 22, a stream service unit 23, a service gateway unit 24, a session control unit 25, a network control unit 26, and It consists of a network connection part 27.

In addition, the delivery system 40 includes a service-related control unit 41, a network-related control unit 42, a central network 43 (core network), an access network 44 (access network), and a home network 45 (in house network). It consists of.

The subscriber station 60 is composed of a network interface unit 61, a set-top unit 62, and a video / audio input / output device 63.

The set-top device 62 includes a product entity 62-1, an application entity 62-2, an environment entity 62-3, and a network connection processor 62-4. Connectivity Entity).

Here, the service-related control unit 41 of the delivery system 40 connects the session control unit 25 and the subscriber station 60 of the service provider system 20, and the network-related control unit 42 is the service provider. The network control unit 26 of the system 20 and the subscriber station 60 is connected.

The central network 43 also provides for establishing a connection between the service provider system 20 and the subscriber station 60. The access network 44 transmits service information to the subscriber station 60 from systems other than the central network 43 and the service provider system 20, and multiplexes the service information. The home network 45 connects the endpoint of the access network 44 with the subscriber station 60.

The network access device 61 receives specific content information of the network transmitted from the delivery system 40, converts the specific content information into a form suitable for the subscriber station 60, and transmits the converted content to the network connection processing unit 62-4.

The network connection device 61 is implemented as a separate device in order to enable the connection between the delivery system 40 and the subscriber station 60 with a minimum replacement of the device even if the specifications of the network change. That is, it is implemented as an external or plug play device.

In addition, the real processor 62-1 receives the actual subscriber request service information and properly displays it to the subscriber station 60 used by the subscriber, and the application service processor 62-2 accepts or requests the application service. It handles the control information of all application services.

The operation environment processor 62-3 serves to create an environment in which the application service programs can operate, and the network connection processor 62-4 connects the subscriber terminal 60 and the network connection device 61 to each other. Ensure error-free information exchange.

In addition, the video / audio input / output device 63 outputs the video and audio signals input from the set-top device 62 so that the subscriber can see or hear the video / audio signal, or receives the video and audio signals of the subscriber.

4 is a block diagram schematically showing the entire system of a video telephony service applied to the present invention. The entire system of the video telephone service is composed of a service provider side 200, a transmission network 220, and a subscriber station 240.

The service provider side 200 includes a content provider system 205 and a server 210.

In addition, the subscriber station 240 includes a network interface unit 242, a set-top unit 244, and a video / audio input / output device 246.

Meanwhile, the content supply system 205 supplies the addressed information content to the server 210.

In addition, the server 210 receives the information content from the content supply system 205 and configures it as a transport stream, and then encodes, multiplexes, encrypts, forwards error correction (hereinafter referred to as FEC) and High frequency conversion is then sent to the transmission network 220.

In addition, the transmission network 220 allows the content of the information sent from the server 210 or the subscriber terminal 240 to be transmitted to the designated destination without error.

In addition, the network connection device 242 receives only a specific transport stream in the transmission network 220, converts it into a form suitable for the set-top device 244, and delivers it to the set-top device 244. The network connection device 242 is implemented as a separate unit to enable the connection of the transmission network 220 and the set-top device 244 with a minimum replacement of units even if the network standard is changed. That is, it is an external or plug play device.

The set-top device 244 demultiplexes, decodes, and decrypts the transport stream received from the network access device 242 to output the video / audio input / output device 246.

Accordingly, the video / audio input / output device 246 outputs the video and audio signals inputted from the set-top device 244 so that the subscriber can see or hear the video or audio signal, or receives the video and audio signals of the subscriber.

5 is a block diagram schematically showing the configuration of a subscriber station in the system having the video telephone service function applied to an embodiment of the present invention. In FIG. 5, a subscriber station having a video telephone service function is composed of a network access device 400, a set-top device 500, an audio input / output device 600, and a video input / output device 650.

Here, the network connection device 400 includes a tuner 410, a demodulator 420, a decryption unit 430, and an interactive communication unit 440.

In addition, the set-top device 500 includes a demultiplexer 505; An audio decoder 510; Video decoder 515; Video memory 520; A central processing unit (hereinafter referred to as CPU); Memory 530; A direct memory access controller 535 (hereinafter referred to as DMAC); A graphic generator 540; Decryption unit 545; A high frequency converter 550; A transmission unit 555; A power supply unit 560; And a remote controller 565.

The graphic generation unit 540 includes a graphic information control unit 541, a graphic memory 542, and a National Television System Committee (NTSC) coder 543.

Meanwhile, the tuner 410 selects a specific channel containing a digital or analog information stream from a transmission network (not shown), and converts a high frequency transport stream on the transmission network into an intermediate frequency transport stream.

In addition, the demodulator 420 demodulates the transport stream input from the tuner 410 in a digital form, decodes the FEC, and outputs the result to the decryption unit 430. The decryption unit 430 Decrypt the demodulated digital information stream.

In addition, the interactive communication unit 440 outputs the decrypted digital information stream to the demultiplexer 505 of the set-top device 500.

In addition, the demultiplexer 505 demultiplexes and outputs the multiplexed digital information stream received from the interactive communication unit 440.

The audio decoder 510 receives an encoded audio signal of the demultiplexed digital information stream, decodes it, and outputs the decoded audio signal in two ways. One is output to the audio input / output unit 600 in the form of an audio-right / left stereo, and the other is output to the high frequency modulator 550.

The video decoder 515 receives and decodes a coded video signal of the demultiplexed digital information stream, and the video memory 520 serves as a storage space for the decoding process of the video signal. It is not shared with other memory functions.

In addition, the CPU 525 controls the entire system to perform bidirectional communication and real-time processing between the server and the subscriber station and performs logic and arithmetic operations required by the system.

The memory 530 should be designed to provide a storage space necessary for the operation of the CPU 525, to provide information necessary to initialize the subscriber station, and to be operated even after the power is turned off.

In addition, the DMAC 535 enables data input and output without the control of the CPU 525.

The graphic information controller 541 of the graphic generator 540 receives the decoded video signal and the graphic information generated from the CPU 525 in an 8-bit bit YC _b C _r format. After overlay, it is also output in 8-bit YC _b C _r format.

In addition, the graphic memory 542 provides a storage space for controlling the graphic information, and should not be shared with other memories, but should be controlled directly by the CPU 525.

The NTSC encoder 543 converts an 8-bit YC _b C _r signal input from the graphic information controller 542 into an NTSC composite video signal, which is an analog signal, and outputs the converted signal.

The decryption unit 545 decrypts the analog video signal and outputs the decrypted signal. There are two output methods. One is to output the decrypted video signal to the video input / output device 650 in the form of a base band video signal, and the other is to output to the high frequency converter 550.

In addition, the high frequency converter 550 converts the intermediate frequency video signal input from the decryption unit 545 into a high frequency so that the video input / output device 650 can receive it and outputs it to the video input / output unit 650. The intermediate frequency audio signal input from the audio decoder 510 is converted into a high frequency so as to be well received by the audio input / output device 600 and output to the audio input / output unit 600.

In addition, the video input / output unit 650 receives the baseband video signal or the high frequency modulated video signal and displays the same to the subscriber, and receives the appearance of the subscriber or other video signals.

The audio input / output unit 600 outputs the audio left / right stereo signal or the high frequency modulated audio signal to the subscriber and receives the subscriber's voice or other audio signal.

The transmitter 555 outputs the input audio signal and the video signal to the network connection device 400, and the power supply unit 560 supplies power required for the entire subscriber station system.

The remote controller 565 is an external device used when the subscriber wants to directly control the subscriber terminal.

6 is a flowchart illustrating a call environment setting method in the system configured as described above. Referring to FIG. 5 and FIG. 6, the call environment setting method is as follows.

In the method of exchanging messages between subscribers subscribed to a server providing a video telephony service, in a first step S1, a requester transmits a call request signal including a requester ID and a responder ID to the server.

In step S2, the server determines whether the requestor ID and the responder ID are in the subscriber list, and then transmits a call request signal to the responder or terminates all call environment setting processes according to the result of the determination.

Here, the subscriber list is a kind of look-up table stored in the storage of the server.

That is, after determining whether the requestor ID and the responder ID are in the subscriber list in step 2-1 (S2-1), if the requestor ID and the responder ID are not in the subscriber list, all call environment setting procedures are performed. To exit.

Subsequently, when the requestor ID and the responder ID are in the subscriber list as a result of the determination in step 2-1 (S2-2), the call request signal is transmitted to the responder.

In a third step S3, the responder terminal receives the call request signal.

That is, in step 3-1 (S3-1), the network access device 400 receives the call request signal. Subsequently, the network connection device 400 transmits the call request signal to the CPU 525 in step 3-2 (S3-2).

In a fourth step S4, the CPU 525 extracts only the ID of the requester from the input call request signal.

In a fifth step S5, the CPU 525 reads a call list stored in advance. Subsequently, in step S6, it is determined whether the requestor's ID is in the call list.

As a result of the determination in the sixth step S6 in the seventh step S7, if the requester's ID is not in the call list, the call environment is set to the voice mode.

On the other hand, in the eighth step S8, if the requestor's ID is in the call list as a result of the determination in the sixth step S6, the level according to the requestor's ID is read.

Subsequently, in the ninth step S9, the call environment is set to the stored still picture mode, the stored moving picture mode, or the real picture mode according to the read level.

In other words, Table 1 below is a random call list.

In step 9-1, it is determined whether the call environment according to the read level is stored in the still picture mode.

Subsequently, when the call environment according to the level is stored in the still picture mode as a result of the determination in the step 9-1 (S9-1) in step 9-2 (S9-2), the call environment is changed to the stored still picture mode. Set it.

As a result of the determination in step 9-1 (S9-1) in step 9-3, when the call environment according to the level is not stored in the still picture mode, the moving picture in which the call environment according to the level is stored Determine if you are in mode.

Subsequently, when the call environment according to the level is stored in the moving image mode as a result of the determination in the step 9-3 (S9-3) in step 9-4 (S9-4), the call environment is set to the stored moving image mode. .

If the call environment according to the level is not stored in the moving picture mode according to the determination result in the step 9-3 (S9-3) in step 9-5 (S9-5), the call environment according to the level is the real picture mode. Determine authorization.

Lastly, when the call environment according to the level is the real picture mode as the result of the determination in the 9-9 step (S9-5) in step 9-6 (S9-6), the call environment is set to the real picture mode. do.

In the tenth step (S10), if there is no level according to the requester ID, an error message is transmitted to the responder, and the call environment is set to the voice mode.

That is, as a result of the determination in step 9-5 (S9-5) in step 10-1 (S10-1), if the call environment according to the level is not a real picture mode, an error message is delivered to the responder, In step 10-2, the call environment is set to the voice mode.

Thus, when the call environment set in the ninth step S9 in the eleventh step S11 is the real picture mode, the call is started.

That is, when the call environment set in the ninth step S9 in the eleventh step (S11-1) is a real picture mode, the call request signal is transmitted to the respondent by voice or text.

Subsequently, the respondent who receives the call request signal in step 11-2 (S11-2) accepts the call and starts a call in step 11-3 (S11-3).

Subsequently, in step 12, call information including the real picture of the respondent is transmitted to the call requester.

That is, in step 12-1 (S12-1), the CPU 525 transmits the call information including the real picture of the responder to the network access device 400.

Therefore, in step 12-2 (S12), the network connection device transmits the call information including the real picture of the responder to the call requester.

In the thirteenth step S13, when the call environment set in the seventh step S7 is the voice mode, or when the call environment set in the ninth step S9 is a stored still picture mode or a stored video image, or When the call environment set in the tenth step S10 is the voice mode, the call is started.

That is, in step 13-1 (S13-1), when the call environment set in the seventh step (S7) is the voice mode, or the call environment set in the ninth step (S9) is stored or stored still picture mode In the case of a moving picture or when the call environment set in the tenth step S10 is a voice mode, a call request signal is transmitted to the respondent by voice or text.

Subsequently, the responder who receives the call request signal in step 13-2 (S1-32) accepts the call and starts a call in step 13-3 (S13-3).

In operation 14, the video input / output device 650 is turned off so that the current responder's appearance and other information are not output.

In the fifteenth step S15, call information including only the stored still picture, the stored moving picture, or the voice on the responder's side is delivered to the call requester.

Subsequently, it is determined whether or not to change the call environment in step 16 (S16).

As a result of the determination in the fifteenth step S15 in the seventeenth step S17, when the call environment is to be changed, the call environment is changed.

On the other hand, if the call information is delivered to the call requester in the twelfth step (S12), or if the call environment is changed in the seventeenth step (S17), all call environment setting process after continuing the call for a predetermined time To exit.

As described above, in a system having a video telephony service function, various call environments are set according to IDs of call requesters, thereby preventing unnecessary appearance of call responders and other information to the requesters.

Claims (5)

CLAIMS 1. A method of exchanging messages between subscribers subscribed to a server providing video telephony service, the method comprising: a first step of a requester delivering a call request signal including a requester ID and a responder ID to a server; A second step of the server determining whether the requestor ID and the responder ID are in the subscriber list, and then transmitting a call request signal to the responder or ending all call setting procedures according to the determination result; A third step of receiving, by the responder, the call request signal; Extracting an ID of a requester from the input call request signal; A fifth step of reading a pre-stored call list; A sixth step of determining whether the requestor's ID is in the call list; A seventh step of setting the call environment to the voice mode when the ID of the requester is not in the call list as a result of the determination in the sixth step; An eighth step of reading a level according to the requester's ID when the requestor's ID is in the call list as a result of the determination in the sixth step; A ninth step of respectively setting a call environment to a stored still picture mode, a stored moving picture mode, or a real picture mode according to the read level; If there is no level according to the requester ID, transmitting an error message to the responder and setting a call environment to a voice mode; An eleventh step of initiating a call when the call environment set in the ninth step is a real picture mode; A twelfth step of transmitting call information including a real picture of the responder to a call requester; When the call environment set in the seventh step is the voice mode, or when the call environment set in the ninth step is a stored still picture mode or a stored video image, or when the call environment set in the tenth step is the voice mode, Initiating step 13; Turning off the video input / output device (14); A fifteenth step of transmitting the call information including only the stored still picture or the stored moving picture or voice of the responder to the call requester; Determining whether to change the call environment; A 17th step of changing the call environment when the call environment is to be changed as a result of the determination in step 16; And an eighteenth step in which all call environment setting processes are terminated after continuing the call for a predetermined time when the call information is transmitted to the call requester in the twelfth step or when the call environment is changed in the seventeenth step. Call environment setting method in a system having a video telephone service function, characterized in that the. The method of claim 1, wherein the second step determines whether the requestor ID and the responder ID are in the subscriber list, and if the requestor ID and the responder ID are not in the subscriber list as a result of the determination, all call environment setting procedures are terminated. Step 2-1; And a step 2-2 of transmitting a call request signal to the responder when the requester ID and the responder ID are in the subscriber list as a result of the determination in step 2-1. How to set up call preferences on your system. The method of claim 1 or 2, further comprising: a step 9-1 of determining whether the ninth step is a still picture mode in which a call environment according to the read level is stored; A step 9-2 of setting the call environment to the stored still picture mode when the call environment according to the level is stored as a result of the determination in the step 9-1; As a result of the determination in step 9-1, when the call environment according to the level is not stored in the still picture mode, determining whether the call environment according to the level is in the stored moving picture mode; A step 9-4 of setting the call environment to the stored moving image mode when the call environment according to the level is stored as the result of the determination in the step 9-3; As a result of the determination in step 9-3, when the call environment according to the level is not stored in the moving picture mode, step 9-5 determining whether the call environment according to the level is a real picture mode; As a result of the determination in the step 9-5, when the call environment according to the level is the real picture mode, the system having the video telephone service function, characterized in that comprises a 9-6 step of setting the call environment to the real picture mode How to set up call preferences in. 10. The method of claim 3, wherein the tenth step comprises: transmitting an error message to the responder when the call environment according to the level is not the real picture mode as a result of the determination in the nineth to fifth step; And setting a call environment to a voice mode in step 10-2. The method of claim 1 or 3, wherein the eleventh step comprises: an eleventh step of transmitting a call request signal to a responder by voice or text when the call environment set in the ninth step is a real picture mode; Step 11-2, wherein the respondent receiving the call request signal accepts the call; And a step 11-3 of initiating a call.