KR100564644B1 - A method for providing communication devices with a call holding service ahd a switching system thereof - Google Patents

Abstract

The present invention relates to a method for providing a call holding service using a switch and to a switch means used in the method, and more particularly, to a user terminal in a switch of a communication system using a session initiation protocol (SIP). A method and system for controlling a call holding operation of a terminal based on information.

According to the method and the switch for providing a call holding service in the exchange according to the present invention, it is possible to prevent the waste of resources of the user terminal by minimizing the function of the user terminal, thereby enabling the switch means to provide functions implemented in the user terminal. It is possible to extract the charging information and to provide other additional services that operate on the basis of call holding only by adding a function of the exchange.

Switchboard, Call Hold, IP-PBX, Soft Switch, Hold Media

Description

A METHOD FOR PROVIDING COMMUNICATION DEVICES WITH A CALL HOLDING SERVICE AHD A SWITCHING SYSTEM THEREOF}

1 is a flowchart illustrating an example of a method for providing a call holding service according to the related art using a SIP proxy server.

2 is a block diagram showing the configuration of an exchange means for providing call hold service according to an embodiment of the present invention.

3 is a call flow diagram illustrating a call flow with first and second user terminals for providing call hold service in an exchange means according to the present invention.

4 is a call flow diagram illustrating a first embodiment of a call flow with first and second user terminals for providing call hold service in an exchange means according to the present invention.

5 is a call flow diagram illustrating a second embodiment of a call flow with first and second user terminals for providing call hold service in an exchange means in accordance with the present invention.

6 is a call flow diagram illustrating a third embodiment of a call flow with first and second user terminals for providing call hold service in an exchange means according to the present invention.

7 is a call flow diagram illustrating a fourth embodiment of a call flow with first and second user terminals for providing call holding service in an exchange means according to the present invention.

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

200: exchange means

201: legacy terminal 202: IP terminal

210: recording means 220: interface unit

230: call control unit 240: gateway unit

250: media transmission control unit

The present invention relates to a method for providing a call holding service using an exchange and a switch means used in the method, and more particularly, to a user terminal in an exchange of a communication system using a session initiation protocol (SIP). A method and system for controlling a call holding operation of a terminal based on information.

Today, due to the rapid spread of the Internet and the demand for various services, the IP (Internet Protocol) network is dramatically developed in terms of performance and service, and the demand for more various services is continuously emerging. An example of such a requirement is the delivery of voice signals over an IP network. The transmission of voice signals through the IP network is supported by Voice over Internet Protocol (VoIP), which is now becoming a big part of the IP network along with the transmission of data, thereby increasing the demand for various voice signal transmission functions. have.

The basic function of the Session Initiation Protocol, which has recently attracted the attention of the multimedia service, is to call voice over Internet Protocol (VoIP) terminals capable of voice communication such as computers, IP phones, PDAs, and mobile phones. To set. This call setup function is not much different from the ITU-T H.323 protocol call setup function. SIP is designed after the text-based Simple Mail Transfer Protocol (STMP) and Hyper Text Transfer Protocol (HTTP), and is a client / server architecture in which the server responds to the call when the client initiates the call. It is based on that. SIP has the advantage of being easy to troubleshoot and network debug by following these existing text-based Internet standards. In addition, SIP is easier to implement than ITU-T's H.323 protocol and has the advantage of being compatible with other services because it is an Internet standard. In particular, SIP is designed to be included as a component of all Internet terminals, all application services, and all network equipment to perform functions such as call setup, call management, and application service requests.

Although SIP was developed as a call establishment protocol for VoIP, it is expected to perform a core function in the next-generation communication network because it is easy to implement and compatible with other services. If the current circuit network is gradually replaced by a packet network such as an IP network, the circuit switch is expected to be replaced by a switch suitable for IP.

The Session Initiation Protocol (SIP) is an application layer signaling protocol proposed in IETF's Working Group (WG) Request For Comments (RFC) 3261. It is used to create, modify, and terminate sessions consisting of one or more participants, which may include Internet multimedia conferencing, IP phone calls, and multimedia data transfer. SIP is defined as five functional components: user agent client (UAC), user agent server (UAS), proxy server, redirect server, and register server. The user agent client (UAC) is a component that makes a SIP request, and the user agent server (UAS) responds to it. The user agent's function is similar to that of the H.323 gateway and terminal functions. There are two methods for handling such SIP requests in the server: proxy mode and redirect mode. The main difference between the two methods is the subject that sends the INIVITE message back to the new address when the called party moves somewhere else. In other words, proxy mode decides which server to send a call request to, and modifies the header and forwards it. Thus, when the recipient's address has been moved, the sender's message is delivered to the recipient of the new address. The proxy server is functionally similar to the user agent server but does not have call control status information.

1 is a flowchart illustrating an example of a method for providing a call hold service according to the related art using the aforementioned SIP proxy server.

Referring to FIG. 1, in a conventional SIP proxy server, call hold including a Re-INVITE method from a first user terminal to perform call hold while a call is connected between a first user terminal and a second user terminal. Receive the message. As described above, the conventional SIP proxy server analyzes the SIP Uniform Resource Identifier (URI) information included in the header of the request message received from the first user terminal and forwards the information to the corresponding receiver (second user terminal). do. The SIP proxy server forwards the call hold perform message including the received Re-INVITE method to the second user terminal, and the second user terminal sends an acknowledgment (ACK) message indicating the INVITE method for the received call hold perform message. do. The SIP proxy server receiving the acknowledgment message forwards it to the first user terminal, and the first user terminal receiving the acknowledgment message transmits the predetermined hold media to the second user terminal in response to the call holding service.

According to the call holding service providing flow according to the related art shown in FIG. 1, since a centrally located SIP proxy server merely performs a function of forwarding a message transmitted between both terminals, to provide a call holding service. There is a problem that the first user terminal or the second user terminal should be a terminal capable of providing call holding service. That is, due to the problem of providing a call holding service directly at the user terminal, it was inevitable to waste resources that the function of the user terminal should be distributed to individual user terminals.

Therefore, the emergence of a new technology that can enhance the efficient use of user terminal resources by integrating such functions for the user terminal into the central system stage, and having the user terminal equipped with only the minimum functions necessary for calls and the like.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a method and a system for providing a call holding service providing function at a central exchange stage instead of a user terminal.

In addition, the method and the switch for providing a call holding service in the exchange according to the present invention records the information of the user terminal in the recording means of the exchange means, and by using this, a call hold of a form suitable for a user terminal connecting to the exchange means. To provide a service for that purpose.

In addition, the method and the switch for providing a call holding service in the switch according to the present invention to minimize the function of the user terminal to provide a function implemented in the user terminal in the switch means, to prevent resource waste of the user terminal It is for that purpose.

In addition, a method and a switch for providing a call holding service in an exchange according to the present invention have an object of improving the efficient use of resources by implementing the above-described functions of the user terminal in the exchange means.

In addition, a method and a switch for providing a call holding service in an exchange according to the present invention, by using a session establishment protocol (SIP), it is easy to implement and easy to provide a variety of application services.

In order to achieve the above object, a call holding method according to a preferred embodiment of the present invention comprises the steps of: maintaining recording means for recording subscriber information of a user terminal; Receiving a call hold event from a first user terminal; Retrieving subscriber information corresponding to the input call hold event with reference to the recording means; Determining, by a predetermined call controller, whether the input call hold event can be processed according to the retrieved subscriber information; If the call controller determines that the call hold event can be processed, transmitting a call hold success message to the first user terminal; Transmitting a call hold execution message to a second user terminal having a call setup with the first user terminal; And controlling transmission of the held media to the second user terminal.

In addition, a call holding method according to another embodiment of the present invention, maintaining the recording means for recording the subscriber information of the user terminal; Receiving a call hold event from a first user terminal; Retrieving subscriber information corresponding to the input call hold event with reference to the recording means; Determining, by a predetermined call controller, whether the input call hold event can be processed according to the retrieved subscriber information; If the call controller determines that the call hold event can be processed, transmitting a call hold execution message to a second user terminal having a call setup with the first user terminal; Sending a call hold success message to the first user terminal; And controlling transmission of the held media to the second user terminal.

In addition, the switch means for providing a call holding service according to an embodiment of the present invention, recording means for recording the terminal information of the user terminal; An interface module for receiving a call holding event from a first user terminal and transmitting a call holding control signal to the first user terminal or the second user terminal corresponding to the call holding event; Search for subscriber information corresponding to the input call hold event with reference to the recording means, determine whether to process the input call hold event according to the retrieved subscriber information, and process the call hold event; A call control unit for transmitting a call hold success message to the first user terminal and transmitting a call hold performance message to the second user terminal if it is determined that the call is successful; And a media transmission control unit for controlling the transmission of the suspended media to the second user terminal when the call suspension succeeds.

The call holding service widely used herein refers to a service that allows a user to hold a current call and attempt to connect a new call, and includes call transfer and call waiting ( It refers to a service that must be performed to provide additional services such as call waiting and conference call.

Hereinafter, with reference to the accompanying drawings will be described in detail a method and system for setting a phone call path according to a preferred embodiment of the present invention.

2 is a block diagram showing the configuration of an exchange means for providing call hold service according to an embodiment of the present invention.

2, the switch means 200 for providing call hold service according to the present invention includes a recording means 210, an interface unit 220, a call control unit 230, a gateway unit 240, and a media transmission control unit. And 250.

The switch means 200 according to the present invention is to provide a switch function for the IP terminal 202 over the IP network, as well as the legacy terminal (general telephone, etc.) 201 through a general public switched telephone network (PSTN). It is possible.

The recording means 210 is for recording subscriber information of one or more users, and the subscriber information may include a telephone number of the user terminal, a SIP address, or service type information subscribed to by the user. The SIP address may have an address type in a format defined by a session establishment protocol (SIP). An example of such an address type is <sip: xener@xener.com>. The service type information is information about a service type subscribed to by the user. For example, when a call-related service subscribed to by the user is a call hold service or a three-way call service, a flag is displayed in a corresponding service type information field. By setting, it is possible to specify the type of service subscribed to by the user.

The interface unit 220 receives a connection request of a terminal through a PSTN or an IP network, and is responsible for an interface function for call setup request or data transmission to a specific terminal.

The call controller 230 is a module for controlling the overall operation of the switch 200 providing the call holding service according to the present invention, and basically the function of controlling the call service between the legacy terminal 201 or the IP terminal 202. In charge of. The call control unit 230 according to the present invention can search for subscriber information corresponding to a call hold event input from a user terminal with reference to the recording unit 210, and process the input call hold event according to the retrieved subscriber information. If it is determined whether or not the call hold event can be handled, the call hold success message is transmitted to the user terminal, and a call hold performance message is transmitted to the counterpart user terminal. It is responsible for controlling the transmission of held media upon successful call hold service.

The gateway unit 240 performs a gateway function for interconnection with heterogeneous communication networks.

The media transmission control unit 250 controls to transmit the predetermined pending media to the calling terminal when the call suspension service is started. According to a preferred embodiment of the present invention, the switch means 200 according to the present invention may include a media storage means (not shown) for sending the held media to the calling terminal when the call is held, and such media storage means. This may be located outside of the exchange means 200 according to the invention. In both cases, the media transmission control unit 250 may control the media storage unit to control the media storage unit to transmit predetermined suspended media stored in the media storage unit to the calling terminal when the call suspension service is started. In addition, according to another embodiment of the present invention, the suspended media may be stored in the calling terminal. The media transmission control unit 250 may not transmit a hold message to the calling terminal, that is, a call hold performing message including a data area including a data area for controlling a system for transmitting a predetermined hold medium to transmit the hold medium. Can transmit According to another embodiment of the present invention, it is also possible to control that the held media stored in the calling terminal, which has received the call holding execution message, is played at the start of call holding through the call holding execution message. Switch system for providing a call hold service according to the present invention is a session initiation protocol (Session Initiation Protocol) such as IP Internet Protocol-Private Branch Exchange (IP PBX), IP-Centrex, soft switch, SIP proxy server or Gateway (Gateway); SIP). IP-PBX is an enterprise voice communication system that provides telephony service based on IP. The IP-PBX can be classified into 1) IP-Enable, 2) Converged, and 3) All-IP. IP-Centrex is a group of subscribers' phone lines that can be managed in the same way as an internal PBX but does not require the purchase or maintenance of equipment such as a PBX.

The soft switch, referred to as a "call agent" or a "media gateway controller", refers to a software switch that provides call control and signaling to a Next Generation Network (NGN).

The block diagram of an exchange system for providing call hold service according to the present invention shown in FIG. 2 is merely classified from a functional point of view, and does not mean an actual implementation method or a hardware method. One or more of the configuration modules shown in FIG. 2 may be integrated or subdivided into one or more configuration modules, which will be apparent to those of ordinary skill in the art.

3 is a call flow diagram illustrating a call flow with first and second user terminals for providing call hold service in an exchange means according to the present invention. 3 is a diagram illustrating a general call flow for providing a call holding service in an exchange according to the present invention.

Referring to Fig. 3, an exchange according to the present invention receives a call hold event from a first user terminal. According to an embodiment of the present invention, a call hold event may occur in the following cases.

(1) Pressing and releasing the hook at the position where the handset of the user terminal is placed for a short time (Hook Flash).

(2) Pressing the flash (recall) key located on the user terminal.

(3) Pressing a call hold dedicated key located on a user terminal.

When such a call holding event is input from the first user terminal, the exchange according to the present invention searches for subscriber information for the first user terminal with reference to the predetermined recording means described above. If the first user who occupies the first user terminal is not subscribed to the call holding service as a result of searching for the subscriber information, a call holding failure message indicating a failure of performing the call holding service may be sent.

If it is determined that the first user is subscribed to a call pending service as a result of retrieving the subscriber information from the exchange (eg, setting a flag in the call pending service field of the service type information of the recording means), the exchange is subjected to a call pending event. A corresponding call hold success message is sent to the first user terminal. In addition, a call hold service is performed by transmitting a call hold performance message to a second user terminal having a call set up with the first user terminal, and controlling to transmit a predetermined hold medium to the second user terminal.

As described above in the description of the media transmission control unit of FIG. 2, the method for controlling the pending media transmission includes (1) a second user terminal receiving a trigger message of the media transmission control unit included in the switch unit according to the present invention. A method of playing the held media, (2) transferring the predetermined held media recorded in the media storage means contained in the exchange means to the second user terminal, or (3) storing the predetermined media located outside the exchange means. And a method of transmitting the held media recorded in the means to the second user terminal under the control of the switch means.

According to another embodiment of the present invention, when receiving a call hold event from the first user terminal, if it is determined that the first user occupying the first user terminal is subscribed to the call hold service Send a suspend success message to the second user terminal and then transmit a call suspend success message to the first user terminal. That is, the call flow diagram shown in FIG. 3 is only one example, and the illustrated call flow may have various modifications. Various time series configurations can exist in the call flow between the first and second user terminals and the switch between the call hold event input from the first user terminal and the control of the hold media transmission to the second user terminal.

4 is a call flow diagram illustrating a first embodiment of a call flow with first and second user terminals for providing call hold service in an exchange means according to the present invention.

The call holding service providing call flow shown in FIG. 4 corresponds to the first specific embodiment of the call flow shown in FIG. 3, and more specifically, the method using the INFO method of the session establishment protocol.

A method is a kind of request for running a SIP server. In the SIP protocol, a method type is included in a request message. Examples of such methods include INVITE, OPTION, ACK, BYE, INFO, NOTIFY, MESSAGE, and the like, and various types of application methods have been developed and proposed.

The call holding service providing method according to the first embodiment of the present invention shown in FIG. 4 is a method using an INFO method. The INFO method is used to transmit application layer information through the SIP signaling path, as defined in RFC-2976. The mid-session signaling information along the signaling path for the call is defined. It is designed to transmit and receive. The INFO method may be included in all messages including the call hold event according to the present invention and transmitted.

First, the first user terminal sends a call hold event INFO message to notify the switch that a call hold event has occurred. The exchange responds with a 200 OK (INFO) message to the received call hold event INFO message. As will be appreciated by those skilled in the art, 1xx means an acknowledgment (ACK) that has a preliminary nature before session establishment, 2xx means a success acknowledgment for a given request, and 3xx means a redirection request ( redirection). In the present embodiment, 200 OK (INFO) is a message for notifying that the call holding event INFO message transmitted from the first user terminal has been successfully received.

The exchange transmits a call hold success INFO message, and the first user terminal transmits a 200 OK (INFO) message to the exchange in response. The exchange receiving the 200 OK (INFO) message for the call hold successful INFO message transmits a call hold performed INFO message to the second user terminal. The second user terminal transmits a 200 OK (INFO) message for the call hold performance INFO message to the exchange, and the exchange receives the predetermined hold media to the second user terminal.

Similar to the description of FIG. 3 described above, there may be various modifications to the call flow shown in FIG. 4. It will be appreciated that various time series configurations can exist in the call flow between the first and second user terminals and the switch between the call hold event INFO message from the first user terminal and the control of the hold media transmission to the second user terminal. Will be self-explanatory.

5 is a call flow diagram illustrating a second embodiment of call flow with first and second user terminals for providing call hold service in an exchange means in accordance with the present invention.

The call hold service providing call flow shown in FIG. 5 corresponds to a second specific embodiment of the call flow shown in FIG. 3, and more specifically, a method using the NOTIFY method of the session establishment protocol.

The NOTIFY method is a method used to notify a subscriber of a change in the status of a subscription that the subscriber has, as defined in RFC-3265. All messages including a call pending event according to the present invention can be transmitted by including a NOTIFY method.

First, the first user terminal sends a call pending event NOTIFY message to notify the switch that a call pending event has occurred. The exchange responds with a 200 OK (NOTIFY) message to the received call pending event NOTIFY message. As described above with reference to FIG. 4, 2xx means a success acknowledgment for a predetermined request. In the present embodiment, 200 OK (NOTIFY) is a message for notifying that a call hold event NOTIFY message transmitted from the first user terminal has been successfully received.

The exchange sends a call pending successful NOTIFY message to the first user terminal, and the first user terminal sends a 200 OK (NOTIFY) message to the exchange in response. The exchange receiving the 200 OK (NOTIFY) message for the call hold successful NOTIFY message transmits a call hold performed NOTIFY message to the second user terminal. The second user terminal transmits a 200 OK (NOTIFY) message for the call hold performed NOTIFY message to the exchange, and the exchange receives the predetermined hold media to the second user terminal.

3, the call flow illustrated in FIG. 5 may have various modifications. It will be appreciated that various time series configurations may exist in the call flow between the first and second user terminals and the switch between the call hold event NOTIFY message from the first user terminal and the control of the hold media transmission to the second user terminal. Will be self-explanatory.

6 is a call flow diagram illustrating a third embodiment of a call flow with first and second user terminals for providing call hold service in an exchange means according to the present invention.

The call hold service providing call flow shown in FIG. 6 corresponds to a third specific embodiment of the call flow shown in FIG. 3, and more specifically, is a hybrid method using the INFO and INVITE methods of the session establishment protocol. .

The INVITE method, defined in RFC-3261, is a method included in a request related to call establishment between a caller and a called party. The INVITE method must include header fields for accept and support for the request. The INVITE and Re-INVITE methods may be included and transmitted in all messages including call hold events according to the present invention.

First, the first user terminal sends a call hold event INFO message to notify the switch that a call hold event has occurred. The exchange responds with a 200 OK (INFO) message to the received call hold event INFO message. As described above with reference to FIG. 4, 2xx means a success acknowledgment for a predetermined request. In the present embodiment, 200 OK (INFO) is a message for notifying that the call holding event INFO message transmitted from the first user terminal has been successfully received.

The exchange transmits a call hold success Re-INVITE message to the first user terminal, and the first user terminal transmits a 200 OK (INVITE) message to the exchange in response. The exchange receiving the 200 OK (INVITE) message for the call hold successful Re-INVITE message transmits an ACK (INVITE) message to the first user terminal. The ACK (INVITE) message means an acknowledgment for the 200 OK (INVITE) message.

The exchange sends a call hold perform Re-INVITE message to the second user terminal. The second user terminal transmits a 200 OK (INVITE) message for the call hold re-INVITE message to the exchange, and the exchange transmits an ACK (INVITE) message to the second user terminal. Subsequently, the exchange controls sending the predetermined held media to the second user terminal.

Similar to the description of FIG. 3 described above, there may be various modifications to the call flow shown in FIG. 6. It will be appreciated that various time series configurations can exist in the call flow between the first and second user terminals and the switch between the call hold event INFO message from the first user terminal and the control of the hold media transmission to the second user terminal. Will be self-explanatory.

7 is a call flow diagram illustrating a fourth embodiment of a call flow with first and second user terminals for providing call holding service in an exchange means according to the present invention.

The call hold service providing call flow shown in FIG. 7 corresponds to the fourth specific embodiment of the call flow shown in FIG. 3, and more specifically, is a hybrid method using the NOTIFY and INVITE methods of the session establishment protocol. .

First, the first user terminal sends a call pending event NOTIFY message to notify the switch that a call pending event has occurred. The exchange responds with a 200 OK (NOTIFY) message to the received call pending event NOTIFY message. In the present embodiment, 200 OK (NOTIFY) is a message for notifying that a call hold event NOTIFY message transmitted from the first user terminal has been successfully received.

The exchange transmits a call hold successful Re-INVITE message to the first user terminal, and the first user terminal transmits a 200 OK (INVITE) message to the exchange in response. The exchange receiving the 200 OK (INVITE) message for the call hold successful Re-INVITE message transmits an ACK (INVITE) message to the first user terminal. The ACK (INVITE) message means an acknowledgment for the 200 OK (INVITE) message.

The exchange sends a call hold perform Re-INVITE message to the second user terminal. The second user terminal transmits a 200 OK (INVITE) message for the call hold re-INVITE message to the exchange, and the exchange transmits an ACK (INVITE) message to the second user terminal. Subsequently, the exchange controls sending the predetermined held media to the second user terminal.

Similar to the description of FIG. 3 described above, there may be various modifications to the call flow shown in FIG. 7. It will be appreciated that various time series configurations can exist in the call flow between the first and second user terminals and the switch between the call hold event NOTIFY message from the first user terminal and the control of the hold media transmission to the second user terminal. Will be self-explanatory.

4 to 7 illustrate various embodiments of the call hold service providing call flow according to the present invention shown in FIG. 3, but those skilled in the art to which the present invention pertains have described above with reference to FIGS. 4 to 7. In addition to the call holding service providing method, one or more various methods including the MESSAGE method may be utilized to recognize that various modified call flows exist. It is apparent that such modified call flow is also within the scope of the present invention described herein.

Embodiments of the invention also include computer-readable media containing program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The medium or program instructions may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

According to the method and the switch for providing the call holding service in the exchange according to the present invention, it is possible to obtain the effect that the call holding service providing function can be implemented in the central exchange stage instead of the user terminal.

In addition, according to the method and the switch for providing a call holding service in the exchange according to the present invention, the information of the user terminal is recorded in the recording means of the switch means, and by using the same, the form suitable for the user terminal connected to the switch means is used. The effect of providing call hold service can be obtained.

In addition, according to the method and the switch for providing a call holding service in the switch according to the present invention, by minimizing the function of the user terminal, it is possible to provide a function implemented in the user terminal in the switch means, waste of resources of the user terminal The effect can be prevented.

In addition, according to the method and the switch for providing a call holding service in the exchange according to the present invention, it is possible to obtain the effect that the efficient use of resources can be improved by implementing the above-described functions of the user terminal in the switch means.

In addition, according to the method and the switch for providing a call holding service in the switch according to the present invention, by using the session establishment protocol (SIP), it is possible to obtain the effect that it is easy to implement and to provide various application services.

Claims (12)

In a call holding method using an exchange, Maintaining a recording device for recording subscriber information of the user terminal; Receiving a call hold event, which is one of a hook flash operation, a flash key input located at the first user terminal, and a call hold dedicated key input located at the first user terminal, from a first user terminal; ; Retrieving subscriber information corresponding to the input call hold event with reference to the recording device; Determining, by a predetermined call controller, whether the input call hold event can be processed according to the retrieved subscriber information; If the call controller determines that the call hold event can be processed, transmitting a call hold success message to the first user terminal; Transmitting a call pending execution message to a second user terminal having a call setup with the first user terminal; And Controlling the transmission of the held media to the second user terminal Call hold method comprising a. In a call holding method using an exchange, Maintaining a recording device for recording subscriber information of the user terminal; Receiving a call hold event, which is one of a hook flash operation, a flash key input located at the first user terminal, and a call hold dedicated key input located at the first user terminal, from a first user terminal; ; Retrieving subscriber information corresponding to the input call hold event with reference to the recording device; Determining, by a predetermined call controller, whether the input call hold event can be processed according to the retrieved subscriber information; If the call controller determines that the call hold event can be processed, transmitting a call hold execution message to a second user terminal having a call setup with the first user terminal; Sending a call hold success message to the first user terminal; And Controlling the transmission of the held media to the second user terminal Call hold method comprising a. delete The method according to claim 1 or 2, The call holding method is performed according to Session Initiation Protocol (SIP), And the first user terminal or the second user terminal is a SIP terminal supporting the session establishment protocol. The method according to claim 1 or 2, The call holding method is performed according to Session Initiation Protocol (SIP), The call hold event is sent to the exchange using a method of any one of INFO, NOTIFY, and MESSAGE of the session establishment protocol, The call hold success message includes one of Re-INVITE, INFO, NOTIFY, and MESSAGE methods of the session establishment protocol, The call hold performing message may include any one of Re-INVITE, INFO, NOTIFY, and MESSAGE methods of the session establishment protocol. The method of claim 5, The step of receiving a call hold event from the first user terminal, And if the input call hold event is normally received, sending a 200 OK message for each method to the first user terminal. The method according to claim 1 or 2, The switch may be any one of IP Internet Protocol-Private Branch Exchange (PBX), IP-Centrex, a soft switch, a SIP proxy server, and a gateway that supports a Session Initiation Protocol (SIP). delete An exchange system for providing call hold service, A recording device for recording terminal information of the user terminal; Receiving a call hold event, which is one of a hook flash operation, a flash key input located at the first user terminal, and a call hold dedicated key input located at the first user terminal, from a first user terminal; An interface module for transmitting a call hold control signal to the first user terminal or the second user terminal corresponding to the call hold event; And Search for subscriber information corresponding to the input call suspension event by referring to the recording device, determine whether the input call suspension event can be processed according to the retrieved subscriber information, and process the call suspension event; If it is determined that, the call control unit for transmitting a call hold success message to the first user terminal, a call hold performance message to the second user terminal, and controls the transmission of the hold media Exchanger system comprising a. delete The method of claim 9, The exchange system is any one of IP Internet Protocol-Private Branch Exchange (PBX), IP-Centrex, soft switch, SIP proxy server and gateway that supports Session Initiation Protocol (SIP) . The method of claim 11, And the first user terminal or the second user terminal is a SIP terminal that supports the session establishment protocol.

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