KR20140055036A - Service apparatus and method for call service in wiress data network - Google Patents

Abstract

The present invention relates to a support system, a service, and a method for a wireless data communications network based call service. When the service device receives an error message representing session update failure from an exchange device connected to a receiving-side terminal device after delivering an update message regularly transmitted from the receiving-side terminal device, the present invention generates charging information including information on a call connection time of a disconnected call and information on a call end reason representing that a call is ended due to the session update failure, and transmits the charging information to a charging device so that the charging device may perform a charging process except for a delay time until the session update failure is recognized.

Description

TECHNICAL FIELD [0001] The present invention relates to a support system, a service apparatus, and a method for a call service based on a wireless data communication network,

The present invention relates to a call service based on a wireless data communication network, and in particular, to provide a call service based on a wireless data communication network, it is possible to minimize a charging error at the time of an abnormal termination due to a network disconnection during a call, And more particularly, to a supporting system, service apparatus and method for a wireless data communication network-based call service.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

As wireless data communication technologies evolve, users want to perform communications with better communication quality and speed. Recently, high-speed wireless data communication (LTE) technology has been developed to enable communication at a high speed, and this high-speed wireless data communication technology can communicate 12 times faster than 3G mobile communication HSDPA And the downloading speed reaches a maximum of 173 Mbps, so that a movie having a capacity of 700 MB can be downloaded at a speed as high as one minute. In addition, all services that can be enjoyed in online environments such as high-definition video and network games can be conveniently used on the go. Therefore, it is attracting attention as a next generation mobile communication method that can cope with the data demand which is accompanied by a smartphone craze.

Meanwhile, data and video call services are provided through the LTE network. However, voice calls do not utilize the LTE network, and related voice call systems (VoLTE) based on a high-speed wireless data communication network, Is being developed.

The VoLTE system refers to providing not only data but also voice signals through the data network. Both callers and recipients can make clear and clear calls with HD quality sound when calling through VoLTE. In addition, since VoLTE services voice and data through the same LTE network, it can provide various services combining voice, video and data services. For example, you can send and receive pictures while sharing a voice call, or share a file.

When a voice or video call is terminated in the VoLTE system, a call is charged. Since a voice or video call signal is transmitted as an RTP (Real-Time Transport Protocol) packet, a service apparatus (TAS) . Therefore, the service apparatus must calculate billing information using only the SIP message.

However, in the wireless data network, a packet loss may occur due to various causes. In the past, a charge is charged more than a real call because the charge is processed without considering a billing error due to the packet loss. Therefore, there is a need for measures to minimize errors in time billing.

The present invention has been proposed in order to solve the inconvenience of the prior art. In order to provide a call service on the basis of a wireless data communication network, the present invention provides a wireless communication system for minimizing a call charging error at an abnormal termination due to a network disconnection, And a support system, service apparatus and method for a data communication network-based call service.

In particular, the present invention has been proposed in order to overcome the inconvenience of the prior art, and it is an object of the present invention to provide a communication disconnection period A service apparatus and a method for a call service based on a wireless data communication network that can calculate a real talk time and add a communication fee based on the calculated talk time.

According to an aspect of the present invention, there is provided a support system for a call service based on a wireless data communication network, comprising: And generating billing information including information on a call connection time of the call call and information on a call termination cause indicating a call termination due to a session update failure, and transmitting the generated billing information to the billing apparatus; And a charging unit for calculating an actual talk time of the terminal device considering the call termination cause upon receiving the charging information from the service apparatus and performing a charging process according to the calculated actual talk time.

The support system for a call service based on the wireless data communication network, wherein the billing apparatus, when the call termination due to the failure of the session update is terminated, It is possible to calculate the actual talk time by subtracting a response message reception waiting time according to the update message transmission of the exchange apparatus.

In addition, a service apparatus for a call service based on a wireless data communication network according to an embodiment of the present invention includes a communication unit for transmitting and receiving a control message for call processing of terminal devices to which a call is connected; And receiving an error message indicating failure of session update of the called terminal from the exchange apparatus to which the called terminal is connected among the terminal apparatuses to which the call is connected through the communication unit, And a control unit for generating billing information including information on a call termination cause indicating that the call is ended and transmitting the generated billing information to the billing apparatus.

Upon receipt of the error message, the control unit of the service apparatus can control the calling terminal unit to transmit a call termination message to the calling terminal unit to which the calling terminal unit is connected.

In addition, when the control unit of the service apparatus receives an error message indicating failure of session update of the called terminal apparatus from the exchange apparatus to which the called terminal apparatus is connected among the terminal apparatuses to which the call call is connected, the control unit of the service apparatus performs call termination to the calling terminal apparatus An accounting termination confirmation unit for extracting information on a call connection time of the calling terminal apparatus; And information on a call connection time of the calling terminal apparatus and information on a call termination cause indicating a call termination due to a failure of session update, And a charging information generating unit for generating the charging information.

Here, the information on the call connection time may be a start time and a call end time of a call connection, or a total call connection time corresponding to an elapsed time from a call connection start time to a call end time, 499 response message.

In addition, a method for a wireless data communication network-based call service according to an embodiment of the present invention includes receiving an error message indicating failure of a session update from an exchange apparatus to which a called terminal unit is connected, Transmitting a call termination message to the switching apparatus to which the calling terminal apparatus is connected according to the error message; Generating billing information including information on a call connection time of the calling terminal and information on a call termination cause indicating that the call is terminated due to a session update failure; And transmitting the generated charging information to the charging apparatus.

The method may further include, before receiving the error message, transmitting the update message transmitted from the switching device to which the calling terminal device is connected to the switching device to which the called terminal device is connected.

The present invention relates to a method and apparatus for providing a call service on the basis of a wireless data communication network, in which, when an abnormal termination occurs due to a network disconnection or battery disconnection, By calculating the time, it is possible to improve the satisfaction of the user while preventing the excessive addition of communication charges.

In particular, in the present invention, when an update message is periodically transmitted from a calling terminal device to a called terminal device to perform a session update, an abnormal call termination due to a failure of session update due to network disconnection or battery disconnection of the called terminal device is terminated , It is possible to calculate the actual talk time in consideration of the call disconnect time until the service apparatus recognizes the end of the call due to the failure of the session update and to perform the billing based on the actual talk time, It is possible to prevent overage of the communication charge in the service.

1 is a diagram illustrating a configuration of a support system for a call service based on a wireless data communication network according to an embodiment of the present invention.
2 is a diagram illustrating a configuration of a service apparatus for a call service based on a wireless data communication network according to an embodiment of the present invention.
3 is a flowchart illustrating a method for a call service based on a wireless data communication network according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary meanings and the inventor is not limited to the concept of terminology for describing his or her invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

First, a support system for a call service based on a wireless data communication network according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a support system for a call service based on a wireless data communication network according to an embodiment of the present invention.

Referring to FIG. 1, a support system for a call service based on a wireless data communication network according to the present invention manages call connection to a plurality of terminal devices 100a and 100b connected through a communication network 10, A billing apparatus 400 for billing the terminal device 100 based on the billing information generated from the service device 300, .

Here, the communication network 10 performs a call connection for voice or video communication between the terminal devices 100a and 100b, and transmits packet-based call data between the two terminal devices 100 connected in a call, . The communication network 10 may be, for example, a packet-based mobile communication network including an LTE network. At this time, one of the two terminal devices 100a and 100b connected to the call supports a call service based on a wireless data communication network, while the other terminal device 100b supports a call service based on a wireless data communication network It is assumed that it does not support. For example, the other terminal device 100b can use the call service through the 3G network, for example.

 The communication network 10 may include a connection device 11, an exchange device 12, and a call connection device 20. The communication network 10 may further include a plurality of communication devices, Descriptions of configurations that are not directly related to the description are omitted.

Here, the connection device 11 serves as a base station or an access point that performs a wireless data transmission / reception function with the terminal device 100. For example, the connection device 11 includes a base station (BS), a base transceiver station (BTS) , eNode B, and the like, and a wireless access pointer of the Wi-Fi network. These connection devices 11 are distributed in different areas and support the formation of a wireless communication channel for use of the communication service of the terminal device 100a located in the communication coverage. The connection device 11 transmits a call connection request message from the terminal device 100a to the switching device 12 and transmits a response to the call connection request transmitted from the opposite device via the switching device 12 to the terminal device 100a, and transmits and receives call data to and from the terminal device 100 after the call connection. Here, the call data for voice or video call is transmitted as a Real-time Transport Protocol (RTP) packet.

For example, the switching device 12 may be a CSCF (Call Session Control Function) of the IMS standard. The switching device 12 is a configuration for performing session management and routing functions in the communication network 10. For example, the switching device 12 may be a CSCF (Call Session Control Function) The switching device 12 performs a call control function between the terminal devices 100 and transmits call data for voice, voice, or video call between the terminal devices 100a and 100b to which the call is connected. In performing the session management and routing functions, the switching device 12 operates in cooperation with the service device 300 supporting the call service based on the wireless communication network according to the present invention.

Specifically, when the exchange apparatus 12 receives a call connection request message from one of the terminal apparatuses 100a and 100b, the exchange apparatus 12 transmits the call connection request message to the called apparatus via the service apparatus 300 Similarly, upon receiving a call termination message (SIP BYE message) from the connected terminal devices 100a and 100b, the call termination message is transmitted to the service device 300 so that the charging process can be performed.

In the embodiment of the present invention, the switching device 12 is connected to the terminal device 100a.

In addition, the call connection device 20 is a configuration for connecting a call between the communication network 10, which is a packet-based wireless data communication network, and another circuit-based communication network (not shown) And transmits them. Specifically, when the call connection device 20 performs a call connection between the terminal device 100a connected to the communication network 10 and the terminal device 100b connected to a communication network (not shown) for providing a circuit-based call service, For example, the SIP message may be converted into an ISUP message and transmitted to the terminal device 100b, or the ISUP message received from the terminal device 100b may be converted into a SIP message and transmitted to the terminal device 100a .

Particularly, in the present invention, when the call connection is made between the terminal device 100b and the call connection request of the terminal device 100b, the call connection device 20 periodically transmits the call connection request message from the calling party to the called party Instead of the terminal device 100b which can not transmit an update message (for example, an UPDATE message of the SIP) to be transmitted to the called party, the update message is periodically generated while the call is connected. The update message transmitted from the call connection device 20 is transmitted to the terminal device 100a via the switching device 12 to which the terminal device 100a is connected.

Upon receiving the update message transmitted from the calling side, the switching device 12 transmits the update message to the terminal device 100a and transmits a response message (for example, SIP And transmits the update message to the terminal device 100b. At this time, the terminal device 100b counts the elapsed time since the update message is transmitted to the terminal device 100b, and transmits the update message to the terminal device 100b If the response message is not received, it is determined that the session is failed to be updated due to the disconnection of the destination network or the disconnection of the battery of the terminal device 100b, and an error message is generated and transmitted to the service device 300.

The service device 300 is an apparatus for supporting a call service based on a wireless data communication network and includes an additional service operation of the terminal devices 100a and 100b, And a subscriber information management function. The service device 300 may be an application server (AS) of the IMS network.

The service device 300 is connected to the terminal devices 100a and 100b through a control message including a call connection request message related to the terminal devices 100a and 100b, You can manage the state.

Specifically, when the service device 300 receives the call connection message and the call termination message of the terminal device 100a through the switching device 12, the service device 300 manages the call connection start time and the call connection call end time, And extracts information on a call connection time for charging according to call connection of the terminal device 100a. The information on the call connection time may include a call start time and a call end time, or may include a total call connection time from the call start time to the call end time. Here, the call start time means a time at which the session connection is started, and the call end time means a time at which the call end is performed by receiving the call end message.

However, when an abnormal termination situation such as a network disconnection or battery disconnection occurs, the service apparatus 300 can not normally receive the above-mentioned control message, in particular, the call termination message and also can not monitor the RTP packet of the call data The above abnormal termination situation can not be recognized.

To this end, the service apparatus 300 recognizes an abnormal termination status such as network disconnection or battery disconnection using an update message periodically transmitted from the terminal devices 100a and 100b to which a call is connected, Can be performed.

Specifically, when the service device 300 receives the update message transmitted from the calling party, that is, the call connection device 20 to which the terminal device 100b is connected, the service device 300 transmits the update message to the called party, Transfers the update message to the exchange 12 to which it is connected, and waits to receive a response message from the exchange 12 to the exchange.

At this time, after the exchange apparatus 12 transmits the update message to the terminal apparatus 100a, the exchange apparatus 12 receives the response message of the terminal apparatus 100a and transmits the response message to the service apparatus 300, If the response message of the terminal device 100a is not received, an error message indicating failure of the session update is generated and transmitted to the service device 300.

Accordingly, the service apparatus 300 terminates the call in response to the failure of the session update and generates billing information corresponding thereto. Upon receiving the error message indicating the failure of the session connection from the switching device 12, the service device 300 according to the present invention transmits a call termination message to the calling party so that the call connection to the calling- End. In addition, the service device 300 generates billing information for the call. Specifically, the service device 300 receives information on the call connection time of the terminated call and information on a call termination cause To generate billing information. Then, the service device 300 transmits the generated billing information to the billing apparatus 400.

The billing apparatus 400 is a device that performs billing processing according to use of a call service for each of the terminal apparatuses 100a and 100b and is provided with billing information transmitted from the service apparatus 300 and subscriber information of the terminal apparatuses 100a and 100b And performs a billing process for using a call service and an additional service for a predetermined period.

Specifically, the billing apparatus 400 calculates the actual talk time using the billing information received from the service apparatus 300, and calculates the call charge by accumulating the actual talk time for a predetermined period. At this time, the billing apparatus 400 confirms the information on the call termination cause included in the billing information transmitted from the service apparatus, and calculates the actual talk time of the terminal apparatus 100 based on the information. Specifically, when the information on the call termination cause indicates that the call is terminated due to the failure of the session update, the billing apparatus 400 updates the total call connection time extracted from the information on the call connection time of the billing information, (I.e., a session renewal period) of the exchange apparatus 12 and a response message reception waiting time of the terminal apparatus 100a in response to the update message transmission of the exchange apparatus 12 is calculated as an actual talk time, Processing is performed. That is, the call rate is calculated by subtracting a delay corresponding to the transmission period of the update message and the waiting time in the switching device 12.

The billing apparatus 400 may be configured such that when the billing apparatus 400 is abnormally terminated due to battery disconnection or network disconnection of the terminal apparatus 100a and the terminal apparatuses 100a and 100b It is possible to add a call charge except the time when the packet is not normally received, that is, the time required for the service device 300 to confirm the failure of the session update, so that the satisfaction and reliability of the user can be further increased.

2, a configuration of a service apparatus 300 for a call service based on a wireless data communication network according to an embodiment of the present invention will be described in detail.

The service device 300 may include a control unit 310, a communication unit 320, and a storage unit 330.

The control unit 310 controls the overall operation of the service device 300 and controls operations such as operations for the call service and controls communication between the switching device 12 and the billing device 400. [ Basically, the control unit 310 receives the call connection and termination messages of the terminal apparatuses 100a and 100b, in particular, the call connection request message and the call termination message through the switching apparatus 12, And performs billing information generation according to the call control function. When the control unit 310 receives the update message for the session connection of the terminal device 100b through the call connection device 20, the control unit 310 transmits the update message to the terminal device 100a ), And waits for a response thereafter. Upon receiving the error message indicating the failure of the session connection from the switching device 12, the control unit 310 determines that the termination of the session due to the disconnection of the called party network or the battery separation of the terminal device 100a has failed, Transmits a call termination message to the terminal device 100b through the call connection device 20, and generates charging information for the released call. Specifically, the control unit 310 generates advertisement information including information on the call connection time of the call call and information on a call termination cause indicating that the call termination is completed in response to the session update failure, and transmits the advertisement information to the charging apparatus 400 through the communication unit 320. [ Lt; / RTI >

For this, the controller 310 may use a timer (Session Expiry Timer) for counting the lapse of the preset time. That is, the control unit 310 initializes the timer every time the update message of the terminal device 100 is received. Accordingly, if the update message is not continuously received, the controller 310 expires after the lapse of the predetermined time, and the controller 310 generates an event related to the abnormal end status for the terminal 100, A call termination and generation of billing information can be performed. Here, the period of the timer, i.e., the predetermined time may be set to a multiple of the transmission period of the update message, for example, the time until the update message is received twice.

For this, the control unit 310 may include an accounting termination confirmation unit 311 and a billing information generation unit 312.

The billing end confirmation unit 311 waits for a response to the update request from the switching device 12 to which the terminal device 100a is connected and receives an error message indicating the failure of the session update from the switching device 12 , It generates and transmits a call termination message for the call terminal apparatus 100b to the call connection apparatus 20 side so as to terminate the call of the terminal apparatus 100b.

The billing information generating unit 312 extracts information on a call termination cause and a call connection time for the terminated call through the billing end confirmation unit 311, and transmits information on the call connection time and a call termination cause And generates accounting information including information on the accounting information. The billing information generated here is transmitted to the billing apparatus 400. At this time, the information on the call termination cause included in the billing information is information indicating termination of the call due to the session renewal failure.

The communication unit 320 is configured to transmit and receive a control message for a call service of the terminal devices 100a and 100b processed by the control unit 310 through the communication network 10. [ Here, the control message may include a SIP message. The communication unit 320 can transmit and receive data through various communication methods as well as wire and wireless methods. In addition, the communication unit 320 may transmit and receive data using one or more communication methods. For this purpose, the communication unit 320 may include a plurality of communication modules for transmitting and receiving data according to different communication methods, respectively. Particularly, the communication unit 320 can receive and transmit the update message of the terminal apparatus 100b to the switching apparatus 12, receive an error message indicating the session failure from the switching apparatus 12, And may transmit a call termination message of the device 100b. In addition, the communication unit 320 may transmit the billing information generated by the control unit 310 to the billing apparatus 400. [

The storage unit 330 stores relevant information for providing a call service in the service device 300. [ For example, the storage unit 330 may store information necessary for generating a call termination message, billing information generated upon termination of an abnormal call, information on a call connection time of a terminated call, and the like. The storage unit 330 may be an optical storage medium such as a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a CD-ROM (Compact Disk Read Only Memory), a DVD (Digital Video Disk) A magneto-optical medium such as a floppy disk and a ROM, a random access memory (RAM), and a flash memory.

A method for a call service based on a wireless data communication network for minimizing a billing error based on the thus configured system will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating a method for a wireless data communication network-based call service according to an embodiment of the present invention.

In the following description, it is assumed that a call is connected between a terminal device 100b that does not support a call service based on a wireless communication network and a terminal device 100a that supports a call service based on a wireless communication network. In particular, the call was connected by a call connection request of the terminal device 100b.

The terminal apparatuses 100a and 100b transmit and receive the control message and the call data for the call processing through the call connection apparatus 20, the call connection apparatus 20 described in FIG. 1 and the exchange apparatus 12, 3, the switching device connected to the terminal device 100a is denoted by 12a and the switching device connected to the call connecting device 20 is denoted by 12b for convenience of explanation.

3, any one of the terminal devices 100a and 100b to which a call is connected through the communication network 10, in particular, the terminal device 100b as a calling side, transmits an update message through the call connection device 20 do. That is, the terminal device 100b that does not support the call service based on the wireless data communication network can not perform the process for updating the session of the SIP. Therefore, in step 1101, the call connection device 20 transmits the terminal device 100b The service device 300 periodically generates and transmits an update message to the called party, which is transmitted to the calling party switching device 12b and the service device 300. In step 1102, the service device 300 transmits the update message to the called party To the terminal device 100a serving as the called party via the switching device 12a of the terminal device 100a.

Here, the update message may be an UPDATE message of the SIP. The SIP UPDATE message is simply used to check the session connection status.

On the other hand, the destination switching apparatus 12a transmits the received update message to the terminal device 100a, operates the predetermined timer according to the update request response wait time in step 1103, And confirms whether a response message is received from the device 100a. The response message is transmitted from the terminal device 100a that normally received the update message, and may be, for example, a SIP 200 OK message.

If the response message to the update message is received from the terminal device 100a before the expiration of the timer, it is recognized that the session update has succeeded and the response message is transmitted to the service device 300. [

On the other hand, if a response message is not received from the terminal device 100a within the waiting period of the update request response until the timer expires, the session is renewed by disconnecting the network of the called party or battery of the terminal device 100a The switching device 12a transmits an error message indicating failure of the session update to the service device 300 in step 1104. In this case, Here, the error message may be a SIP 499 response message.

When the service device 300 receives the error message indicating the failure of the session update from the switching device 12a after transmitting the update message, the service device 300 performs the call termination of the calling terminal device 100b in step 1105. [ Specifically, the service device 300 transmits a call termination message to the terminal device 100b to the caller's switching device 12b to which the call connection device 20 is connected.

In step 1106, the service device 300 generates accounting information for the terminated call. Specifically, the service apparatus 300 extracts information on the call connection time of the terminated call, and information on a call termination cause indicating that the call termination is terminated due to the session update failure, and generates billing information including the termination cause.

Then, the service apparatus 300 transmits the billing information generated in step 1107 to the billing apparatus 400.

Accordingly, in step 1108, the billing apparatus 400 calculates the actual billing time using the received billing information, and calculates and adds the call charge based on the calculated actual billing time. Specifically, when the call termination is the termination of the call due to the failure of the session update, the billing apparatus 400 determines from the information about the call connection time the session renewal period (i.e., the update message transmission period) The time when the response waiting time for the update message of the update message is subtracted from the actual talk time can be calculated. To this end, the billing apparatus 400 may previously store information about the session renewal period (i.e., the update message transmission period) and the response waiting time for the update message of the exchange apparatus 12b.

The method for a call service based on the wireless data communication network according to the present invention may be implemented as a program and recorded in a computer readable recording medium, wherein the program instructions are specifically designed and configured for the present invention, And may be those known and used by those skilled in the art. For example, the recording medium may be an optical recording medium such as a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a compact disk read only memory (CD-ROM), a digital video disk (DVD) Includes a hardware device that is specially configured to store and execute program instructions such as a magneto-optical medium such as a floppy disk and a ROM, a random access memory (RAM), a flash memory, do. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such a hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

The present invention relates to a method and apparatus for providing a call service on the basis of a wireless data communication network, in which, when an abnormal termination occurs due to a network disconnection or battery disconnection, By calculating the time, it is possible to improve the satisfaction of the user while preventing the excessive addition of communication charges.

In particular, in the present invention, when an update message is periodically transmitted from a calling terminal device to a called terminal device to perform a session update, an abnormal call termination due to a failure of session update due to network disconnection or battery disconnection of the called terminal device is terminated , It is possible to calculate the actual talk time in consideration of the call disconnect time until the service apparatus recognizes the end of the call due to the failure of the session update and to perform the billing based on the actual talk time, It is possible to prevent overage of the communication charge in the service.

10: communication network 100a, 100b:
12, 12a, 12b: switching device 300: service device
310 communication unit 320 control unit
330: Storage unit 400: Charging device

Claims (9)

When receiving an error message indicating failure of session renewal of the called terminal apparatus from the exchange apparatus to which the called terminal apparatus is connected among the two terminal apparatuses to which the call is connected, the information about the call connection time of the call call and the call A service device for generating billing information including information on an end cause and transmitting the billing information to the billing device; And
And a charging unit for calculating an actual talk time of the terminal device considering the cause of the call termination and performing a charging process according to the calculated actual talk time upon receiving the charging information from the service device, Support system for communication service based on network. The billing apparatus according to claim 1,
When the call termination due to the session update failure is completed, the session renewal period and the waiting time for receiving the response message due to the update message transmission of the exchange apparatus are subtracted from the total call connection time determined from the information about the call connection time, And a call control unit for controlling the call control unit and the call control unit. A communication unit for transmitting and receiving a control message for call processing of terminal devices to which a call is connected; And
When receiving an error message indicating failure of session update of the called terminal apparatus from the exchange apparatus to which the called terminal apparatus is connected among the terminal apparatuses to which the call call is connected through the communication unit, A control unit for generating billing information including information on a call termination cause indicating that the call is ended and transmitting the billing information to the billing apparatus;
And transmitting the service request message to the service providing apparatus. 4. The apparatus of claim 3, wherein the control unit
Upon receipt of the error message, controls the sending terminal device to transmit a call termination message to the calling terminal device to the connected exchange device. The apparatus of claim 3,
When an error message indicating failure in session update of the called terminal apparatus is received from the exchange apparatus to which the called terminal apparatus is connected among the terminal apparatuses to which the call is connected, the call termination to the calling terminal apparatus is terminated, An accounting termination confirmation unit for extracting information on the accounting period; And
When the call termination to the calling terminal apparatus is completed, information on the call connection time of the calling terminal apparatus and information on a call termination cause indicating that the call termination due to the session renewal failure is obtained, A billing information generating unit to generate billing information;
And transmitting the service request message to the service providing apparatus. 4. The method of claim 3, wherein the information on the call connection time
A call connection start time and a call end time, or a total call connection time corresponding to an elapsed time from a call connection start time to a call end time. 4. The method of claim 3, wherein the error message
And a 499 response message of the SIP. Receiving an error message indicating failure of a session update from an exchange apparatus to which a destination terminal apparatus is connected among terminal apparatuses to which a call is connected;
Transmitting a call termination message to the switching apparatus to which the calling terminal apparatus is connected according to the reception of the error message;
Generating billing information including information on a call connection time of the calling terminal and information on a call termination cause indicating that the call is terminated due to a session update failure; And
Transmitting the generated charging information to the charging device;
The method comprising the steps of: Further comprising the step of transmitting the update message transmitted from the switching device to which the calling terminal device is connected to the switching device to which the called terminal device is connected before the step of receiving the error message, .

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