KR100969457B1 - Apparatus and method for providing POTS phone with MID-CALL services on NGN - Google Patents

Abstract

The present invention relates to a mid-call service apparatus and a method of a general telephone in a next-generation communication network, and receives a hook flash event (service request) requested from a general telephone user in an Internet protocol (IP) -based next-generation communication network, Provides call service (especially call forwarding service, three-person call service, etc.), and provides various services for general telephones and IP terminals, enabling mid-call of general telephones to activate telephone use and improve network utilization rate A service device and a method thereof are provided.

To this end, the present invention, a mid-call service apparatus, the application server for performing the call control service logic; A media server for transmitting a midcall service announcement on a corresponding channel under the control of the application server; And controlling and interoperating with the access gateway AG in a packet network to perform a call processing control function for the first terminal, wherein the call transfer service from the first terminal is in a state where the first terminal and the second terminal are in a call. Upon receiving the request, a new call path between the at least one third terminal to which the first terminal intends to transfer the call and the second terminal is established, and the call connection between the first terminal and the second terminal is released. It includes a soft switch, and is used for mid-call service devices in next-generation communication networks.

Next Generation Network, Midcall, Application Server, Hook Flash, POTS Terminal, SIP

Description

Apparatus and method for providing POTS phone with MID-CALL services on NGN}             

1 is a configuration diagram of an embodiment of a mid-call service apparatus for a general telephone in a next-generation communication network according to the present invention.

Figure 2 is a configuration diagram of an embodiment of a soft switch (SSW) of the mid-call service device of the general telephone in the next-generation communication network according to the present invention.

FIG. 3 is a diagram illustrating an embodiment of a mapping process between an INAP origination and call model and a MEGACO call flow performed by a MEGACO call processor in the soft switch of FIG. 2. FIG.

FIG. 4 is a diagram illustrating an embodiment of a mapping process between an INAP origination call model and a SIP call flow performed by a SIP call processor in the soft switch of FIG.

FIG. 5 is a diagram for explaining an operation of an application service processor of the soft switch of FIG. 2; FIG.

6 is an exemplary diagram illustrating an internal protocol conversion table in the protocol conversion unit of FIG. 2.

7 is a flowchart illustrating an embodiment of a mid-call service method for a general telephone in a next-generation communication network according to the present invention.                 

8 is a flowchart illustrating a message processing procedure of a call forwarding service in a mid-call service method of a general telephone in a next-generation communication network according to the present invention.

* Explanation of symbols for the main parts of the drawings

11: general telephone terminal (POTS terminal) 12: SIP terminal

13 access gateway (AG) 14 NGN packet network

15: mid-call service device 151: application server

152: media server 153: soft switch

The present invention relates to a mid-call service apparatus and method for a general telephone in a next generation network (NGN), and more particularly, to a general telephone (here, a general telephone is public exchange in an internet protocol (IP) -based next-generation network). Receives the requested hook flash event (service request) from the user and provides mid-call service (especially call forwarding service, three call service, etc.) during the telephone call. The present invention relates to a mid-call service apparatus and a method of a general telephone in a next-generation communication network that provides various services for a telephone and an IP terminal, thereby enabling activation of telephone use and improving network utilization.

In general, the MID-CALL service refers to a service that allows another service to be provided by a request from one of the callers and the called party. A call waiting service that allows you to be notified of a call arriving from this third party, alternating with an ongoing call, or a call hold service that allows the calling or called party to hold a call that is currently in progress during a call. ', A call forwarding service that allows the calling or called party to forward the call by entering a third phone number during a call, or by entering a third number at the request of the calling or called party during the call. An example would be a three-party call service that participates in an ongoing call.

The request for the midcall service is transmitted to the network by briefly pressing the hook button on the calling or receiving terminal (ordinary telephone terminal) in a call (hook flash) or by pressing the flash button in case of an IP terminal. Done. Ordinary telephone terminals can also use the flash button.

In general, the mid-call service on a telephone in such a communication network is provided to a telephone user included in a private network using a private exchange (PBX), or a subscriber of a local exchange using a local exchange equipped with an intelligent network function. It can provide, but it is expensive and difficult to maintain, making it difficult for small businesses or individual users to use such services.

Therefore, there is an urgent need to provide such services in telecommunications networks so that they can be used on regular telephones without the investment and maintenance of private networks or regional exchanges.

Moreover, the mid-call service provided on the existing PBX is limited to the telephone function because it is designed for the telephone terminal, but in the next-generation communication network, the customized application service logic by the subscriber (by the application server) and Since there is an advantage of providing a higher value-added mid-call service by various announcements (by a media server), the mid-call service in the next generation communication network is more urgently required.

The present invention has been proposed to meet the above-mentioned demands, and receives a hook-flash event (service request) requested from a general telephone user in an Internet Protocol (IP) -based next-generation communication network, and provides a mid-call service during a telephone call ( In particular, by providing a call forwarding service, a three-person call service, etc., by providing a variety of services for the general telephone and IP terminals, the mid-call service device of the general telephone that can activate the use of the telephone and improve the network utilization rate; The purpose is to provide a method.

An apparatus of the present invention for achieving the above object is a mid-call service apparatus, comprising: an application server for performing a call control service logic; A media server for transmitting a midcall service announcement on a corresponding channel under the control of the application server; And controlling and interoperating with the access gateway AG in a packet network to perform a call processing control function for the first terminal, wherein the call transfer service from the first terminal is in a state where the first terminal and the second terminal are in a call. Upon receiving the request, a new call path between the at least one third terminal to which the first terminal intends to transfer the call and the second terminal is established, and the call connection between the first terminal and the second terminal is released. It includes a soft switch.

In addition, another apparatus of the present invention, a mid-call service apparatus, comprising: an application server for performing the call control service logic; A media server for transmitting a midcall service announcement on a corresponding channel under the control of the application server; And controlling and interoperating with the access gateway AG in a packet network to perform a call processing control function for the first terminal, wherein the multi-party call service is provided from the first terminal while the first terminal and the second terminal are in a call. Upon receiving the request, the call connection is set to 'at least one third terminal to which the first terminal wants to participate in the call' to establish a call path established between the first terminal and the second terminal. It includes a soft switch to extend to the terminal.

On the other hand, the method of the present invention, a mid-call service method, comprising: accommodating a first terminal in a packet network through an access gateway; A service request detection step of detecting a mid-call service request from the first terminal while the first terminal and the second terminal are in a call; A guide broadcast sending step of transmitting a guide broadcast for inducing a service selection input; And in response to the announcement, when a call transfer service request is received from the first terminal, sets a new call path between the at least one third terminal to which the first terminal intends to transfer and the second terminal. And a mid-call service step of releasing a call connection between the first terminal and the second terminal.

In addition, another method of the present invention, a mid-call service method, comprising: accommodating a first terminal in a packet network through an access gateway; A service request detection step of detecting a mid-call service request from the first terminal while the first terminal and the second terminal are in a call; A guide broadcast sending step of transmitting a guide broadcast for inducing a service selection input; And upon receiving a multi-party call service request from the first terminal, establish a call connection to 'at least one third terminal to which the first terminal wants to participate in the call', and thus, between the first terminal and the second terminal. And a mid-call service step of extending the set call path to the at least one third terminal.

In still another aspect of the present invention, there is provided a midcall service method, comprising: a service request step of an access gateway notifying a soft switch of an event when a service request (event) occurs from a terminal during a telephone call; The service processing request step of finding a detection point matching the event transmitted by the soft switch to the application service processing unit, and requesting the service processing to the application server when the detection point and the predetermined detection point received by the application service processing unit matches. ; A call processing request step of requesting a call connection to the soft switch by receiving the information collected through the announcement broadcast to the terminal by making a call connection request to the media server for the service requested by the application server; The soft switch receives the call processing request from the application server and finds a matching call processing point and transmits it with the SIP message to the SIP call processing unit or the protocol conversion unit; And controlling a corresponding SIP terminal by performing a call processing according to a call processing point received by the SIP call processing unit, or converting a call processing point and a MEGACO message into a MEGACO message after the protocol conversion unit receives a SIP message. And transmitting to a call processor to control the access gateway by performing the call processing on the MEGACO call processor.

The above-mentioned objects, features and advantages will become more apparent from the following detailed description in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to explaining the present invention, in the present embodiment, for convenience of explanation, the telephone terminal is used as the first and second means for transmitting and receiving, and for call forwarding when a hook user causes a hook flash event during a call. Or limited to the third means for call connection to the third telephone terminal for the three-person call, it will be appreciated that this number can be adaptively changed according to the number of telephone terminals.

1 is a configuration diagram of an embodiment of a mid-call service apparatus for a general telephone in a next-generation communication network according to the present invention.

As illustrated in FIG. 1, in a next-generation communication network, the mid-call service device 15 of a general telephone, under the control of an application server 151 and an application server 151 for performing call path control service logic, performs a corresponding call. The media server 152 for transmitting the midcall service announcement on the channel and the NGN packet network 14 control and interact with the access gateway (AG) 154 to call processing for the general telephone terminal 11. While performing the control function, when the call forwarding service request from the general phone terminal 11 is received while the general phone terminal 11 and the SIP terminal 12 are in a call, 'the general phone terminal 11 is intended to transfer the call. And a soft switch 143 for establishing a new call path between the terminal (not shown) and the SIP terminal 12, and for releasing a call connection between the general telephone terminal 11 and the SIP terminal 12. .

In addition, the present invention further includes an access gateway (AG) 13 connected to the NGN packet network 14 to accommodate a general telephone network-based general telephone terminal (POTS) 11 in the NGN packet network 14. .

As described above, the mid-call service apparatus in the next generation communication network according to the present invention is characterized in that each component operates based on SIP.

The operation of the mid-call service device in the next-generation communication network of the present invention having the above structure will be described in detail as follows.

As shown in FIG. 1, a general telephone terminal (POTS terminal) 11 is a wired / wireless telephone terminal based on a public switched telephone network, and a Session Initiation Protocol (SIP) terminal 12 is an IP terminal based on a SIP protocol. The POTS terminal 11 connects to the NGN packet network 14 through the access gateway 13, and the SIP terminal 12 can directly connect to the NGN packet network 14.

The Access Gateway (AG) 13 packetizes voice and directly connects to the NGN packet network 14 to be controlled by the soft switch 153 through the MEGACO protocol. Perform the function.

SoftSWitch (SSW) 153 provides a call processing control function to support voice in NGN packet network 14, and controls and interacts with access gateway 13.

The application server (AS) 151 provides a creation and execution environment of various high value-added application services in addition to the basic services provided by the soft switch 153, and provides an intelligent network service of a public switched telephone network (PSTN). Service control device), which can respond quickly to new service demands.

Media Server (MS) is an IP-based Voice-over-IP (VoIP) system that provides various types of resources for service using the SIP standard protocol, and provides announcements and voice recognition through IP networks. As a component for providing voice synthesis, voice XML, or FAX service, it performs call control, codec, and packet conversion functions.

2 is a configuration diagram of an embodiment of a soft switch (SSW) 153 of a mid-call service apparatus in a next-generation communication network according to the present invention.                     

As shown in FIG. 2, the soft switch 153 includes a SIP call processing unit 21 for controlling a Session Initiation Protocol (SIP) terminal and a MEGACO (Media Gateway Control) call for controlling the access gateway 13. A processing unit 22, a protocol conversion unit 23 for converting a MEGACO message into a SIP message used inside the system, and a detection point information management unit for managing detection point information of an application service controlled by the access gateway 13; It includes an application service processing unit 24 consisting of a call processing operation control unit for controlling the call processing operation.

In addition, each of the internal modules of the soft switch 153 except for the MEGACO call processing unit 22 for controlling the access gateway 13 operates based on SIP, and works in conjunction with the application server 151 or the SIP terminal 12. It easily operates to the service processing request of the application server 151, but interworking with the access gateway 13 is interlocked and controlled through the MEGACO call processing unit 22 and the protocol conversion unit 23.

In addition, the soft switch 153 uses an intelligent network part (INAP) call model, which is an intelligent network protocol, to find a detection point when the MEGACO message is input and to activate the call processing point when the call processing point is received. MEGACO including a call processing unit 22 and a SIP call processing unit 21 for locating a detection point when receiving a SIP message using an INAP call model for SIP call processing and activating the corresponding call processing point when receiving a call processing point. Mapping messages and SIP messages to the INAP call model facilitates call processing, facilitating protocol conversion between MEGACO and SIP messages.

In the next-generation communication network of the present invention having the structure as described above, the operation of the soft switch (SSW) of the mid-call service device of the general telephone is described in detail as follows.

When the telephone user of the originating terminal POTS terminal 11 makes a call in the next generation communication network, the access gateway 13 converts the message into a MEGACO protocol message and transmits the message to the soft switch 153.

The soft switch 153 finds a detection point by using the MEGACO call model in the MEGACO call processing unit 22, converts the message into a SIP message through the protocol conversion unit 23, and passes the message to the application service processing unit 24.

The application service processing unit 24 triggers a service to the application server 151 when there is a service request to process the input detection point. The application server 151 performs triggered service logic to transmit the corresponding call processing message to the application service processing unit 24, and the application service processing unit 24 performs call processing control on the received call processing message to the SIP terminal. If the message is sent to the SIP call processing unit 21, if the message to the POTS terminal 11 is sent to the protocol conversion unit 23 is converted into a MEGACO message to be delivered to the MEGACO call processing unit 22. The SIP call processor 21 transmits the transmitted message to the corresponding SIP terminal 12 through the SIP stack, and the MEGACO call processor 22 transmits the transmitted message to the corresponding POTS terminal via the MEGACO stack and the access gateway 13. 11) to transmit.

FIG. 3 is a diagram illustrating an embodiment of a mapping process between an INAP origination and call model and a MEGACO call flow performed by the MEGACO call processor in the soft switch of FIG. 2.

As shown in FIG. 3, the MEGACO call processing unit is composed of an outgoing INAP call model and an incoming INAP call model, and the call processing point related to the MEGACO call processing and the detection point related to the INAP call processing are matched to each other. Alternatively, the MEGACO message transmitted from the called party access gateway transmits the detection point information mapped in FIG. 3 to the application service processor through the protocol converter and activates the call processing point according to the call flow from the application service processor through the protocol converter.

FIG. 4 is a diagram illustrating an embodiment of a mapping process between an INAP origination call model and a SIP call flow performed by a SIP call processing unit among the soft switches of FIG. 2.

As shown in FIG. 4, the SIP call processing unit is composed of an outgoing INAP call model and an incoming INAP call model, and the call processing point related to the SIP call processing and the detection point related to the INAP call processing are matched. Alternatively, the SIP message transmitted from the called SIP terminal transmits the detection point information mapped in FIG. 4 to the application service processor and activates the call processing point according to the SIP call flow in association with the application service processor.

FIG. 5 is a diagram for explaining an operation of an application service processor of the soft switch of FIG. 2. FIG.

As shown in FIG. 5, the application service processing unit includes a detection point information management unit and a call processing operation control unit.

Here, the detection point information management unit performs a function of managing the detection point information for the application service of the application server (AS), consisting of information on the detection point number, the type of detection point, the triggered service processing request to detect the application server Point is set, and when the registered detection point is transmitted from the SIP call processing unit or the MEGACO call processing unit through the protocol conversion unit, the corresponding service processing request that is mapped is found and the corresponding service of the application server is triggered. The detection point type of the detection point information management unit includes trigger detection and event detection, and trigger detection means detection of a signaling message related to initial call connection between originating and receiving, and event detection means terminal user is generated after call connection between originating and receiving. It means the detection of events.

FIG. 6 is an exemplary diagram illustrating an internal protocol conversion table in the protocol conversion unit of FIG. 2. The protocol conversion unit performs one-to-one mapping between each message by performing conversion between a MEGACO message and a SIP message as in the protocol conversion table of FIG. 6. .

Hereinafter, with reference to FIG. 7 attached to the mid-call service process of the general telephone in the next generation communication network according to the present invention with the above-described configuration will be described in detail.

7 is a flowchart illustrating a method for mid-call service of a general telephone in a next-generation communication network according to the present invention.

As shown in FIG. 7, in order to perform a midcall service of a general telephone in a next generation communication network, a hook flash event occurs through a telephone terminal during a call (701). Select a service (702). For example, an announcement is made to select 1 for a call transfer request and 2 for a 3 call request.

Subsequently, after confirming the received contents as described above (703), if a call forwarding request message is selected, the user is guided to enter a phone number to forward the call, receives a call forwarding number, connects a new call line between the called party and the forwarding number, Call connection ends (704-707).

On the other hand, when confirming the received content as described above (703) when the three-call request message is selected (that is, when the user who caused the hook flash event requested a three-way call), likewise to participate in the call The phone number of the new user is input and the current call is connected (708, 709) to check whether the connection is successful (710).

As a result, if the call connection result is successful, a three-person call is started (708), if no answer is terminated (709), or if the terminal is not accessible, the terminal is not attached to the network (712). In case of network congestion, network congestion announcement broadcasts (713).

8 is a flowchart illustrating a message processing process of a call forwarding service in a mid-call service method of a general telephone in a next-generation communication network according to the present invention.

As shown in FIG. 8, when the access gateway 81 notifies the caller's off-hook event to the soft switch 82 (801), the soft switch 82 sends a dial tone to the access gateway 81 (802). After requesting to receive the number of the corresponding digit map and to monitor the on-hook event, a request for generating the outgoing leg is requested (803). At this time, the originating access gateway 81 determines whether the subscriber is a service for the service provided by the application server 83, and if so, the soft switch 82 transmits the SIP message about the call connection request to the application server 83 and again. After receiving the message, if the number of the corresponding digit map is input, it recognizes it as the called number and generates a called leg to open a call path between the caller and the called party (804 to 806).

At this time, when the caller causes a hook flash event, the access gateway 81 notifies the soft switch 82 of the event in a Notify message of the MEGACO protocol (807), and the soft switch 82 sends the message to the SIP. The INFO method of the protocol is converted to the application server 83 and informed (808). The application server 83 first requests the softswitch 82 to hold the called party's phone (809) and the softswitch 82 holds the incoming leg information to the called party's access gateway 85 to do this. Modify to (HOLD) and request on-hook (On hook) monitoring (810).

Subsequently, the application server 83 sends a SIP INVITE message to the media server 84 to request a call connection with the caller (811,812), and also to the soft switch 82 to re-INVITE. By sending a message (813) requesting a call connection with the media server 84, the softswitch 82 modifies the outgoing leg information to request the access gateway 81 to modify the destination and port information to be connected, thereby connecting between the sender and the media server. The call path is connected (814).

When the application server 83 sends the corresponding announcement to the media server 84 in an info message (815), the media server 84 broadcasts the announcement to the caller, collects the digits, and sends the announcement to the application server 83. (816, 817). The application server 83 sends a BYE message to the media server 84 to terminate the call connection (818, 819).

The application server 83 dials the collected digit when the collected digit is the call forwarding number, and sends a re-INVITE message to the soft switch 82 for connection with the called party when the call is connected. The switch 82 connects the called party's access gateway 81 with the connection address and port number information of the called leg and monitors the on-hook event, thereby connecting a new call path between the called party and the forwarding number (820 to 826). The application server 83 sends a BYE message to the soft switch 82 to release the caller's call connection so that the soft switch 82 deletes the originating leg (827 to 830).

In the present embodiment, the terminal making the midcall request is described as a case of POTS phone, which is a telephone terminal, but in the case of a SIP terminal, the midcall request can be performed in the same manner. . In this case, however, the Info (INFO) method, which is a mid-call request SIP message, is directly transmitted from the SIP terminal to the application server 83.

In the present embodiment, but illustrated as the case of call forwarding and three-person call, it can be applied to a variety of additional services using midcall, such as call waiting, internal call reservation, it is obvious that it should also be seen as the same as the present invention.

The method of the present invention as described above may be implemented as a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.). 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 not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention can provide a variety of mid-call services provided by the next generation communication network to existing POTS telephone users and IP terminal users, thereby activating telephone use and improving network utilization rate. There is.

Claims (14)

In the mid-call service device, An application server for performing control service logic with a call; A media server for transmitting a midcall service announcement on a corresponding channel under the control of the application server; And Access and control the access gateway (AG) in the packet network to perform a call processing control function for the first terminal, the call transfer service request from the first terminal while the first terminal and the second terminal is busy Upon reception, a software for establishing a new call path between the at least one third terminal to which the first terminal intends to transfer the call and the second terminal and releasing the call connection between the first terminal and the second terminal. switch Midcall service device comprising a. The method of claim 1, The access gateway (AG), And a first call terminal connected to the packet network and accommodating the first terminal based on a general telephone network in the packet network. In the mid-call service device, An application server for performing control service logic with a call; A media server for transmitting a midcall service announcement on a corresponding channel under the control of the application server; And Access and control the access gateway (AG) in the packet network to perform a call processing control function for the first terminal, the multi-party call service request from the first terminal while the first terminal and the second terminal is busy Upon reception, the call connection is set to 'at least one third terminal which the first terminal wants to participate in the call', thereby establishing a call path established between the first terminal and the second terminal. Softswitch to extend Midcall service device comprising a. The method of claim 3, wherein The access gateway (AG), And a first call terminal connected to the packet network and accommodating the first terminal based on a general telephone network in the packet network. The method according to any one of claims 1 to 4, The first terminal, the second terminal, and the at least one third terminal are any one of a wired / wireless telephone terminal (POTS terminal) or an Internet terminal (SIP terminal) based on a public switched telephone network. The mid-call service device, the mid-call service device, characterized in that operating on the basis of SIP. The method of claim 5, The soft switch, A SIP call processor for controlling the Session Initiation Protocol (SIP) terminal; A MEGACO (Media Gateway Control) call processing unit for controlling the access gateway; A protocol conversion unit for converting the MEGACO message into a SIP message used in the system; And Application service processing unit for managing the detection point information of the application service controlled by the access gateway and control the call processing operation Midcall service device comprising a. The method of claim 6, The MEGACO call processing unit, For the MEGACO call processing, we use the INAP call model to input the MEGACO message to find the detection point and the call processing point to activate the call processing point. The SIP call processing unit, A mid-call service device, characterized in that a SIP message is input using an INAP call model for SIP call processing, a detection point is detected, and a call processing point is received to activate a corresponding call processing point. In the mid-call service method, Accepting a first terminal in a packet network through an access gateway; A service request detection step of detecting a mid-call service request from the first terminal while the first terminal and the second terminal are in a call; A guide broadcast sending step of transmitting a guide broadcast for inducing a service selection input; And In response to the announcement, upon receiving a call transfer service request from the first terminal, a new call path is established between the at least one third terminal to which the first terminal wants to transfer and the second terminal. Mid-call service step of releasing the call connection between the first terminal and the second terminal Midcall service method comprising a. In the mid-call service method, Accepting a first terminal in a packet network through an access gateway; A service request detection step of detecting a mid-call service request from the first terminal while the first terminal and the second terminal are in a call; A guide broadcast sending step of transmitting a guide broadcast for inducing a service selection input; And Upon receiving the multi-party call service request from the first terminal, establish a call connection to 'at least one third terminal to which the first terminal wants to participate in the call', and is established between the first terminal and the second terminal. Mid-call service step of extending a call path to the at least one third terminal Midcall service method comprising a. 10. The method according to claim 8 or 9, The first terminal, the second terminal, and the at least one third terminal are any one of a wired / wireless telephone terminal (POTS terminal) or an Internet terminal (SIP terminal) based on a public switched telephone network. The mid-call service method, the mid-call service method characterized in that the operation based on SIP. In the mid-call service method, A service request step of an access gateway notifying a soft switch of the event when a service request (event) occurs from a terminal during a telephone call; The service processing request step of finding a detection point matching the event transmitted by the soft switch to the application service processing unit, and requesting the service processing to the application server when the detection point and the predetermined detection point received by the application service processing unit matches. ; A call processing request step of requesting a call connection to the soft switch by receiving the information collected through the announcement broadcast to the terminal by making a call connection request to the media server for the service requested by the application server; The soft switch receives the call processing request from the application server and finds a matching call processing point and transmits it with the SIP message to the SIP call processing unit or the protocol conversion unit; And The SIP call processing unit performs a call processing according to the received call processing point to control the corresponding SIP terminal, or after the protocol conversion unit receives the SIP message and converts it into a mapped MEGACO message, the call processing point and the MEGACO message are converted into the MEGACO call. A control step of transmitting to the processing unit so that the MEGACO call processing unit performs call processing to control the access gateway; Midcall service method comprising a. The method of claim 11, The soft switch, And receiving a hook flash event generated during a call on a general telephone terminal through the access gateway and loading the hook flash event in an info method of a SIP protocol to the application server. The method of claim 11, The soft switch, If the hook-flash button is pressed during the call on the SIP terminal and the mid-call service is requested, the mid-call service method receives the info (INFO) method from the SIP terminal and transmits it to the application server. The method according to any one of claims 11 to 13, The MEGACO call processing unit, For the MEGACO call processing, we use the INAP call model to input the MEGACO message to find the detection point and the call processing point to activate the call processing point. The SIP call processing unit, Method for receiving a SIP message using the INAP call model for the SIP call processing, and finds the detection point and receives the call processing point to activate the call processing point.

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