KR100330545B1 - Method and system of duplication of transmitting billing data for duplicated automatic call distributer system - Google Patents

Abstract

The present invention relates to a server redundancy method and system, and more particularly, in an automatic call distribution system, in the event of a failure of a local network connecting a redundant server and a charging centralization center, the data can be transmitted to the charging centralization center without dropping the charging data. Provide technology.

The present invention provides an automatic call distribution system, wherein a redundant server for transmitting billing data to a billing center is provided with a reflective memory in which a redundant server is updated in real time, and billing data is transmitted to the billing center. In this case, the transfer information of the billing data file is stored in the reflective memory so that the first server in the active state is kept in the standby state even if a failure occurs in the first local network during the transfer of the billing data using the first local network. The second server reads the transmission information of the billing data file stored in its reflective memory, grasps the billing data transmitted to date, and uses the second local network connecting the second server and the billing concentration center. The billing data file can be transferred to the billing concentration center without missing billing data.

Description

Method and system for duplication of billing data transmission in redundant automatic call distribution system {METHOD AND SYSTEM OF DUPLICATION OF TRANSMITTING BILLING DATA FOR DUPLICATED AUTOMATIC CALL DISTRIBUTER SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplication technology of a network server, and in particular, a duplication method and system for billing data transmission in an automatic call distributer system (ACD). It is about.

Currently, many social fields provide a variety of services using data communication, and a company providing a service using data communication has secured many users due to the convenience of data communication. Therefore, a company that provides a network service is using server duplication technology to reduce network burden by many users and to efficiently manage stable services and data.

In the case of automatic call distribution system, in order to provide stable service to telephone subscribers and to efficiently manage billing data generated by service use, a server generating service and control process is active and standby by ) The system is dualized into a structure, and a billing concentration center is installed to process billing data in a batch.

However, even if the server providing the service is duplicated, in the case of transmitting the charging data generated by the user's use of the service, if the local network connecting the charging centralization center and the duplicated server fails, There is a problem that omission occurs.

1 is a block diagram of a system for charging data transmission in an automatic call distribution system according to the prior art. Referring to FIG. 1, an automatic call distribution system according to the related art is connected to a network 11 for providing a service to a telephone subscriber and to a network 11 in an active and standby structure to form a redundant server system 10. The billing concentration center 14 for processing billing data generated by the first server 12, the second server 13, and the redundant server system 10 is configured. In addition, the automatic call distribution system according to the prior art is a duplication of the first local network 15, the second local network 16 in order to transmit the charging data generated in the redundant server system 10 to the charging centralization center 14 It has a transmission path.

The redundant server system 10 according to the prior art has a sharing means 17 for sharing data between the first server 12 and the second server 13 to synchronize the charging data generated by the active server, Through the communication channel 18 connecting the server 12 and the second server 13, it is possible to communicate whether a system failure occurs between the redundant servers 12 and 13.

According to the prior art, the first server 12 in the active state that provides the service through the network 11 generates charging data according to the use of the service, and the second server in the standby state using the data sharing means 17. The billing data is shared with the bill 13, and the billing data is transmitted to the billing centralization center 14 using the first local network 15.

If a failure occurs in the first local network 15 connecting the first server 12 in an active state, the first server 12 recognizes a failure of the first local network 15 and communicates with the communication channel ( 18, the second server 13 in the standby state is notified of the failure of the first local network 15 and is switched to the standby state, and the second server 13 is switched to the active state so that the second local network ( 16) the billing data is transmitted.

According to the related art, when the first server 12 which is active transmits the generated charging data to the charging centralization center 14, the charging data is transmitted to the charging centralization center 14 for the service case provided to the telephone accessor. In the case of transmission, since a huge traffic occurs in the charging centralization center 14 receiving the charging data, in order to reduce such a network burden, the charging data is batched and transmitted to the charging centralization center. .

However, in the charging data transmission system according to the related art, the first local network 15 fails while the active first server 12 transmits the charging data batch to the charging centralization center 14 so that the second server 13 fails. Is converted to an active state, the second server 13 cannot know to which of the charging data batches the first server 12 has transmitted before failure of the first local network 15. Therefore, the prior art suspends the transmission of the billing data batch of the corresponding period in which the first local network 15 has failed in order to prevent the billing data from being duplicated in the billing concentration center 14, and billing incurred from the next cycle. It will send you a batch of data. That is, a missing portion of the charging data due to the first local network failure occurs.

In order to solve such a problem, the conventional technology is inconvenient that the operator of the billing concentration center must check the missing part of the billing data by hand, and request the billing data for the missing part to the redundant server to receive and manage the missing part separately. There was this.

Currently, a technique for guaranteeing transmission of data without missing data on such a network is disclosed in Korean Patent Laid-Open Publication No. 1999-0050226 and US Patent No. 4,390,984.

However, according to the prior art described in the aforementioned Korean Patent Laid-Open Publication No. 1999-0050226, by simultaneously transmitting the same data through both network lines while the network line for transmitting data is duplicated, a failure occurs in one network line. Even if the data is transmitted through another network line to prevent data loss, when applied to the automatic call distribution system, there is a problem in that the charging data is doubled and the user is charged an unfair fee.

In addition, according to the aforementioned U.S. Patent No. 4,390,984, a network for transmitting data for transmission of data without omission is composed of a plurality of transmission control devices and a local network connecting them, and thus the abnormality of the local network through the transmission control device from time to time. It checks for the presence and transmits data without missing through the network line without any problem. However, the above-mentioned technique guarantees transmission without missing data, but requires a huge installation cost.

Therefore, in the automatic call distribution system, it solves the inconvenience of the prior art that the operator must manually check and update the missing part manually by missing the billing data according to the failure of the local network, and missing the billing data for consumption There is an urgent need for a new billing data transmission method that ensures no transmission.

Accordingly, a first object of the present invention is to provide a data transmission method and system capable of reliably transmitting billing data generated in a redundant server constituting an automatic call distribution system to a billing concentration center without data loss.

The second object of the present invention is to prevent the omission of billing data and to ensure reliable transmission in the event of a failure of the local network connecting the redundant server constituting the automatic call distribution system and the charging centralization center in addition to the first object. The present invention provides a method and system for duplication of billing data transmission.

1 is a block diagram of a redundant server system according to the prior art.

2 is a block diagram of a redundant server system according to an embodiment of the present invention.

3 is a diagram illustrating an operation flow of a redundant server system when a failure occurs in a local network according to an exemplary embodiment of the present invention.

4A-4B are flow diagrams illustrating the workflow of redundant server system data transmission in accordance with an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

11, 310: network

12, 320: first server

13, 330: second server

14, 340: intensive charging center

15, 350: local network connecting the first server and the centralized charging center

16, 360: local network connecting the second server and the centralized charging center

17: data sharing means for data sharing

18, 380: system failure monitoring communication channel

322, 332: hard disk

323, 333: Reflective Memory (RFM)

370: reflective memory connection transmission means (optical cable)

In order to achieve the above object, the present invention provides a multiplexing server system for providing a network service as a plurality of servers, the plurality of servers to drive the charging data processing process for the network service regardless of whether the active state or standby state A reflective memory configured to store charging data for the network service provided by the multiplexing system, file storage information of the charging data, and file transfer information of the charging data; Local storage means for storing the charging data in accordance with file storage information of the charging data; Reflective memory data transmission means for connecting the reflective memories provided in each of the plurality of servers to each other to synchronize the contents stored in the plurality of reflective memories in real time; It provides a multiplexing server system including a local network means for connecting the plurality of servers and the billing concentration center for processing the billing data.

In order to achieve another object of the present invention, a method for transmitting the billing data generated as a result of the service provided by the multiplexed server of the automatic call distribution system to the charge centralization center, the active state of the plurality of servers The charging data generated as a result of the service provided by the charging data processing process running on the first server is synchronized to the local storage means of each of the plurality of servers, and stored in the reflective memory of each of the plurality of servers. Storing storage information of the billing data file; The reflective memory provided by each of the plurality of servers, wherein the charging data processing process running on the first server transmits the charging data to the charging centralization center at predetermined time intervals through a first local network. Storing transmission information of the billing data file in a; Detecting, by the server, a standby state of an abnormality of the first local network when the first local network fails while the first server transmits the charging data to the charging centralization center through the first local network; And charging the billing data processing process driven by the server in the standby state to read transmission information of the billing data file stored in the reflective memory included in the standby server, and receiving the transmission of the billing data file. It provides a data transmission method of the multiplexing server.

Hereinafter, with reference to the accompanying drawings Figures 2 to 5 will be described in detail an embodiment of a duplication method and system of charging data transmission of the automatic call distribution system according to the present invention. The data transmission technology of the server according to the present invention can be extended to a redundant server system or a system multiplexed with a plurality of servers. The data transmission technique according to the present invention is a preferred embodiment, which is described above by applying the charging data to the centralized concentration center in the redundant server of the automatic call distribution system, but the idea of the present invention is not only an automatic call distribution system. Those skilled in the art should recognize that the data generated by the multiplexed active or standby server can be extended to other hosts without missing them.

2 is a block diagram of a charging data transmission redundancy system in an automatic call distribution system according to the present invention. Referring to Fig. 2, there is shown a redundant server system 300 and a billing concentration center 340 constituting an automatic call distribution system.

The redundant server system according to the present invention includes a first server 320 and a second server 330 connected to the network 310 in an active and standby structure. The redundant servers 320 and 330 can provide services to telephone subscribers via the network 310 using microprocessors 321 and 331, respectively. In addition, the redundant servers 320 and 330 may generate billing data according to a user's service use, and have hard disks 322 and 332 for storing the generated billing data, respectively. The first server 320 and the second server 330 may include a communication channel 380 for system monitoring, and may monitor a system failure of the other party by exchanging heartbeats with each other.

In a preferred embodiment according to the present invention, the communication channel 380 for system monitoring may be a local network using TCP / IP or UDP / IP protocol. In addition, the redundant servers 320 and 330 according to the present invention may be connected to the local networks 350 and 360 to transmit the billing data generated according to the service usage to the billing centralization center 340.

The redundant servers 320 and 330 according to the present invention are characterized by having a reflective memory (RFM) 323 and 333 in addition to the hard disks 322 and 332 capable of storing charging data. The RFMs 323 and 333 may be mounted and used in the PCI slots of the first server 320 and the second server 330, respectively. The RFMs 323 and 333 mounted in the respective servers 320 and 330 may be mutually connected. Connection may be made using the transmission means 370.

As a preferred embodiment according to the present invention, the transmission means 370 may be an optical cable, and since the optical cable 370 used transmits data at a fast transmission speed of less than nanoseconds, each redundant The RFMs 323 and 333 mounted to the servers 320 and 330 may synchronize data in near real time through the optical cable 370.

Therefore, when the first server 320 in the active state records the transmission information in the first RFM 323 while transmitting the charging data through the first local network 350, the second server is almost in real time via the optical cable 370. The server 330 may read transmission information of billing data stored in the second RFM 333.

Figure 3 is a diagram showing the flow of work for the duplication of billing data transmission in the automatic call distribution system according to the present invention. Referring to FIG. 3, the first server 320 may provide a service to the user through the network 310 in an active state, and the second server 330 may be in a standby state and may communicate with the communication channel 380. Monitor the system failure of the first server 320 by using.

The microprocessor 321 of the first server 320 that is active generates a service providing process 410 for providing a service to a telephone subscriber, and generates charging data generated by the service providing process 410 according to service usage. A charging data processing process 420 is created for storage on the hard disk 322. In addition, the microprocessor 331 of the second server 330 in the standby state is a charging data processing process for storing the charging data generated by the first server 320 to the hard disk 332 of the second server 330. Generate 430.

The billing data generated by the service providing process 410 of the first server 320 is stored in the first RFM 323 by the data processing process 420, and in real time through the optical cable 370, the second RFM ( 333). In addition, the billing data stored in the first RFM 323 and the second RFM 333 are equally stored in the hard disks 322 and 332 by the billing data processing processes 420 and 430 of the respective servers 320 and 330. The charging data processing processes 420 and 430 of the servers 320 and 330 store the storage information of the charging data stored in the hard disks 322 and 332 in the RFMs 323 and 333 mounted on the server.

As a preferred embodiment according to the present invention, the billing data stored in the hard disks 322 and 332 may be stored in a file form, and the name of the stored file may be a current time of storing. As a preferred embodiment according to the present invention, the current time stored as a file name may include the current year, month, day, hour, minute, and second stored.

In a preferred embodiment according to the present invention, the file storage information of the billing data stored in the RFMs 323 and 333 of each server 320 and 330 is stored in the hard disks 322 and 332 of each server 320 and 330. File name of the charging data, a sequence ID indicating the order in which the files are stored, and one bit data indicating whether the charging data is transmitted to the charging centralization center 340.

Meanwhile, the active first server 320 may transmit the charging data stored in the hard disk 322 to the charging centralization center 340 using the first local network 350 at a predetermined time period. The first server 320 transmitting the charging data generated within the predetermined period to the charging centralization center 340 transmits the charging status information of the charging data to the first RFM 323 mounted on the first server 320 during the charging data transmission. The transmission state information stored in the first RFM 323 may be stored in the second RFM 333 of the second server 330 through the optical cable 370.

According to a preferred embodiment of the present invention, the predetermined period for transmitting the charging data to the charging centralization center 340 by the first server 320 in the active state may be 5 minutes.

In a preferred embodiment according to the present invention, the billing data transmission status information stored in the RFMs 323 and 333 of each server 320 or 330 may include a start sequence ID, an end sequence ID, and a transmission completion of the billing data file to be transmitted. The sequence ID of the billing data file, the status of the local network being used as a data transmission path, and the like.

Figure 4a is a flow chart showing the workflow of the first server by the charging data transmission redundancy method in the automatic call distribution system according to the present invention. Referring to FIG. 4A, the first server 320 provides a service to the telephone accessor in an active state, and then generates charging data according to service use (step S501).

Each server (320, 330) stores the billing data in the form of a file on the hard disk (322, 332) using the first RFM 323 and the second RFM (333), RFM (323, In step 333, the charging data storage information is stored (step S502). Subsequently, the first server 320 determines the start sequence ID and the end sequence ID of the billing data file to be transmitted to the billing concentration center from the billing data storage information stored in the first RFM 323 at predetermined intervals, and the sequence ID is determined. The transmission information for the charging data to be stored is stored in the first RFM 323 (step S503). Subsequently, the first server 320 checks whether the first local network 350 has failed to transmit the charging data to the charging centralization center 340 (S504).

If there is a failure in the first local network 350, the second server 330 is notified of the failure of the first local network 350 (step S505).

If there is no failure in the first local network 350, the first server 320 reads the transmission information stored in the first RFM 323 and determines the sequence ID of the charging data file to be transmitted, and the first local network 350. The charging data file having the corresponding sequence ID is transmitted to the charging centralization center 340 using step S506. Then, it is checked whether or not the charging data file having the sequence ID transmitted from the charging concentration center 340 has been received (step S507).

Upon confirming receipt of the billing data file from the billing concentration center 340 according to the present invention, the transmission information is updated by storing the sequence ID of the billing data file received in the first RFM 323 (step S508). Subsequently, it is checked whether all billing data files to be transmitted are completed (step S509), and when not completed, the first server 320 transmits the billing data files until the completion of the transfer of all billing data files to be transmitted ( Step S506), and storing the transmission information (step S508) is repeated.

According to a preferred embodiment of the present invention, when the transfer of the billing data file batch is completed, transmission information is stored in the first RFM 323 of the start sequence ID and the end sequence ID of the billing data to be transmitted among the billing data generated during the predetermined period. (Step S502), and confirming the completion of transfer of the charging data file to be transmitted (step S509).

If the acknowledgment message of the billing data file is not transmitted from the billing concentration center 340 within a predetermined time, the second server 330 is notified of the failure of the first local network 350 (step S505).

In a preferred embodiment of the present invention, the first server 320 to notify the second server 330 of the failure of the first local network 350 may notify the failure using the communication channel 380, In another preferred embodiment of the present invention, the RFMs 323 and 333 may record whether the first local network 350 has failed.

In a preferred embodiment of the present invention, the first server 320 may transmit the charging data to the charging centralization center 340 by using FTP, and the charging centralization center 340 may be transferred to the first server 320. The transmission of the acknowledgment message may be the transmission of one bit data. In addition, as a preferred embodiment of the present invention, the transmission state information stored in the first RFM 323 may be stored in the second RFM 333 in real time through the optical cable 370.

In a preferred embodiment of the present invention, confirming the completion of the transfer of all billing data files to be transmitted at a predetermined cycle time may be performed by comparing the sequence ID of the billing data file to be transmitted and the end sequence ID of the billing data file batch to be transmitted. .

In a preferred embodiment of the present invention, the predetermined time to receive the acknowledgment message of the billing data file from the billing concentration center 340 may be shorter than the time required to transmit all billing data.

Figure 4b is a flow chart showing the workflow of the second server by the charging data transmission redundancy method in the automatic call distribution system according to the present invention. 4B, the second server 330 is notified of the failure of the first local network 350 from the first server 320 (step S510), and transmits the transmission information stored in the second RFM 333. It reads out and recognizes the sequence ID of the most recently transferred billing data file (step S511). Subsequently, the billing data is transferred to the billing concentration center 340 from the sequence ID to start the transmission to the end sequence ID of the billing data file to be transmitted (step S512).

In a preferred embodiment of the present invention, the second server 330 is notified of the abnormality of the first local network from the first server 320 is a communication connecting the first server 320 and the second server 330 A notification may be received through the channel 380. In another preferred embodiment, the notification may be received from state information of the first local network 350 stored in the RFMs 323 and 333.

In a preferred embodiment of the present invention, transmitting the charging data to the charging centralization center 340 from the sequence ID to start transmission to the ending sequence ID of the charging data file to be transmitted is repeated steps S502 to S509. can do.

The foregoing has outlined rather broadly the features and technical advantages of the present invention to better understand the claims of the invention which will be described later. Additional features and advantages that make up the claims of the present invention will be described below. It should be appreciated by those skilled in the art that the conception and specific embodiments of the invention disclosed may be readily used as a basis for designing or modifying other structures for carrying out similar purposes to the invention.

In addition, the inventive concepts and embodiments disclosed herein may be used by those skilled in the art as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. In addition, such modifications or altered equivalent structures by those skilled in the art may be variously changed, substituted, and changed without departing from the spirit or scope of the invention described in the claims.

As described above, the present invention includes a redundant memory constituting an automatic call distribution system having a reflective memory that is updated in real time to store transmission status information of a billing data file transmitted when billing data is transmitted to a billing concentration center. Thus, when the second server in the standby state takes over the transfer process of the billing data file using the second local network, the billing data transfer status information stored in its reflective memory is read out to troubleshoot the first local network. It can prevent the omission of transmission of the billing data file.

As a result, even in the event of a failure of the first local network, the billing data can be transmitted to the billing concentration center stably without missing.

Claims (19)

In the multiplexing server system for providing a network service as a plurality of servers, the plurality of servers run the billing data processing process for the network service regardless of whether the active state or standby state, A reflective memory for storing charging data for the network service provided by the multiplexing system, file storage information of the charging data, and file transfer information of the charging data; Local storage means for storing the charging data in accordance with file storage information of the charging data; Reflective memory data transmission means for connecting the reflective memories provided in each of the plurality of servers to each other to synchronize the contents stored in the plurality of reflective memories in real time; Local network means for connecting said plurality of servers with a charging concentration center for processing said charging data; Multiplexed server system, including. The multiplexing server system of claim 1, wherein the reflective memory is mounted in a PCI slot of the server. The multiplexing server system according to claim 1, wherein the reflective memory data transmission means has a data transmission / reception port and is connected to each other by an optical cable. The data transfer rate of the reflective memory data transfer means is faster than the rate at which the billing data processing process stores the billing data in a local storage means, and the rate of processing for transfer to a billing concentration center. Multiplexing server system characterized by having a transmission rate. The multiplexing server system of claim 1, wherein the multiplexing server further comprises a communication network for monitoring a failure of a local network of a server in an active state among the plurality of servers. 2. The multiplexing server system of claim 1, wherein the multiplexing server system comprises an automatic call distribution system. The multiplexing server system of claim 1, wherein the billing data includes service usage information of a user generated in connection with a service of the multiplexing server providing a network service. In the automatic call distribution system, A method for transmitting the billing data generated as a result of the multiplexed server to provide a service to the billing concentration center, The billing data generated as a result of providing a service by a billing data processing process running in a first server active among the plurality of servers is stored in synchronization with local storage means of each of the plurality of servers, and the plurality of servers Storing storage information of the billing data file in each reflective memory; The reflective memory provided by each of the plurality of servers, wherein the charging data processing process running on the first server transmits the charging data to the charging centralization center at predetermined time intervals through a first local network. Storing transmission information of the billing data file in a; Detecting, by the server, a standby state of an abnormality of the first local network when the first local network fails while the first server transmits the charging data to the charging centralization center through the first local network; And Acquiring transmission information of the charging data file stored in the reflective memory provided in the standby server by the charging data processing process running in the standby server, and receiving the transmission of the charging data file; Data transmission method of the multiplexing server comprising a. The method of claim 8, wherein each of the plurality of servers stores charging data in a local storage means, and storing the storage information of the charging data file in the reflective memory. The charging data processing process running on the first server generates the charging data, stores the charging data file in the local storage means of the first server, and stores the charging data file in the reflective memory of the first server. Storing the name and sequence ID of the; And The billing data processing process running on the server in the standby state among the plurality of servers is synchronized with the reflective memory of the first server to its reflective memory connected to the reflective memory of the first server. Storing the charging data in its local storage means by using the stored charging data and the storage information of the charging data file Data transmission method of the multiplexing server comprising a. The billing data processing process of claim 9, wherein the billing data processing process running on the first server stores the billing data file in a local storage means of the first server, and the billing data file in a reflective memory of the first server. The step of storing the name and the sequence ID of the data transmission method of the multiplexing server comprises storing the current time stored in the local storage means of the first server as the name of the billing data file. 9. The method of claim 8, wherein each of the plurality of servers stores billing data in a local storage means, and storing the storage information of the billing data file in the reflective memory. The data transmission method of the multiplexing server further comprising storing data that can indicate the presence or absence of transmission. The billing data processing process of claim 8, wherein the billing data processing process running on the first server transmits the billing data to the billing concentration center at predetermined time intervals through a first local network, wherein each of the plurality of servers is provided. Storing the transmission information of the charging data file in the reflective memory, Determining a start sequence ID and an end sequence ID of the billing data to be transmitted from the storage information of the billing data file stored in the reflective memory of the first server, and storing them in the reflective memory; Transmitting the corresponding charging data having a sequence ID to be transmitted from the local storage means of the first server to the charging centralization center via the first local network; Receiving, by the first server, a transmission confirmation message of charging data transmitted from the charging concentration center; And Storing, by the first server, a sequence ID of charging data received from the charging concentration center in the reflective memory; Data transmission method of the multiplexing server comprising a. The method of claim 12, wherein the start sequence ID and the end sequence ID of the charging data to be transmitted are determined from the storage information of the charging data file stored in the reflective memory of the first server, and stored in the reflective memory. The multiplexing server may include determining a start sequence ID and an end sequence ID by reading data identifying the presence or absence of the transmission to a charging concentration center among storage information of the charging data file stored in the reflective memory. Method of data transfer. The method of claim 12, wherein the start sequence ID and the end sequence ID of the billing data to be transmitted are determined from the storage information of the billing data file stored in the reflective memory of the first server, and stored in the reflective memory. The method may further include determining a start sequence ID and an end sequence ID based on any one or a combination of sequence IDs of billing data generated within the predetermined period. 13. The multiplexing of claim 12, wherein the transmitting of the corresponding charging data having a sequence ID to be transmitted from the local storage means of the first server to the charging centralization center via the first local network comprises transmitting by FTP. How the server sends data. The billing data processing process of claim 8, wherein the billing data processing process running on the first server transmits the billing data to the billing concentration center at predetermined time intervals through the first local network, wherein each of the plurality of servers is provided. Storing the transmission information of the billing data file in the reflective memory further comprises storing in the reflective memory whether or not the first local network used for transmission has failed. . 10. The method of claim 8, wherein when the first local network fails while the first server transmits the charging data to the charging centralization center through the first local network, an abnormality of the first local network is in a standby state. Sensing by the server comprises connecting the plurality of servers through a communication channel for monitoring the failure of the local network through the transmission method of the multiplexing server. 10. The method of claim 8, wherein when the first local network fails while the first server transmits the charging data to the charging centralization center through the first local network, an abnormality of the first local network is in a standby state. The detecting of the server further includes reading and detecting transmission information stored in a reflective memory mounted on the standby server of the standby server among the plurality of servers. The billing data processing process of claim 8, wherein the billing data processing process running on the standby server reads the transmission information of the billing data file stored in the reflective memory included in the standby server and transmits the billing data file. The step of watering the Reading a sequence ID of a most recently transferred charging data file from transmission information of the charging data file stored in a reflective memory provided in the standby server; Reading an end sequence ID of a charging data file to be transmitted from transmission information of the charging data file stored in a reflective memory provided in the standby server; And Transmitting the charging data file to the charging centralization center until the charging data file with the termination sequence ID is transmitted using a second local network connected to the server in the standby state. Data transmission method of the multiplexing server comprising a.