KR20050022805A - System and method for providing callback service using short message - Google Patents

Abstract

PURPOSE: A callback service system using a short message and a method thereof are provided to make a communication path between an originating terminal and a receiving terminal by performing a call connection from the receiving terminal to the originating terminal, thereby providing a callback service at low cost. CONSTITUTION: A message receiving unit receives a short message from an originating terminal(S600). A callback confirming unit confirms whether the short message is a callback request message(S610). If so, an information extracting unit extracts callback request information including each phone number of an originating terminal and a receiving terminal, and an authentication number from the short message(S620). A message transmitting unit transmits callback request information to a determined call service system(S670). The determined call service system authenticates a callback request on the basis of the authentication number(S680). The determined call service system sets a call of the receiving terminal and the originating terminal, and make a communication path for a callback call by connecting the set calls(S690).

Description

System and method for providing callback service using short message

The present invention relates to a callback service system and method, and more particularly, a callback for establishing a communication path between a calling terminal and a called terminal by a call connection from a called terminal or a call relay system to a calling terminal using a text message. A service system and method.

The callback service is a service that connects a call by calling a domestic user in a third country when the domestic user makes a phone call to an exchange of a third-party communication line distributor and hears only a dial tone. In addition, there is a callback service of a method in which a third party automatically dials a domestic caller so that the caller can dial a desired number directly. In these callback services, call charges are charged on a third-party basis.

Meanwhile, with the development of communication technology and the wide spread of the Internet, international telephone service using VoIP (Voice over Internet Protocol) as well as existing international telephone service using optical cable or satellite are being provided. In addition, the restrictions on the provision of telecommunications services have been relaxed, and various companies are providing international call services. As a result, operators with competitive solutions in the international telephony market, low prices, or high call quality can use their differentiated sales strategies and gain a competitive advantage over other service providers.

The rates for international telephony services currently offered in the international telephony market depend on the network conditions that make up the call route (such as the type of connection between the International Private Leased Circuits). In particular, if the node connection between countries is not established, it is necessary to go through the detour route to other countries, and there are cases where expensive rates are applied depending on the telephone network construction conditions and lake capacity of the contact country. Therefore, the call charges according to the call connection by the international call system installed in the country where the receiver is located may be charged less than the call charges by the call connection by the international telephone system installed in the country where the caller is located. Under such a communication environment, a callback request by a caller can provide an environment in which a caller can call at a lower price. However, the callback service provided so far has the inconvenience that the caller has to make a call to the receiver or the relay system.

An object of the present invention is to provide a system and method for providing a callback service using a short message without the user making a call to the callback service providing system.

In order to achieve the above technical problem, a preferred embodiment of the callback service system using a short message according to the present invention, receiving a short message from the calling terminal, the identification information of the calling terminal, the receiver terminal from the received short message A message processing unit which extracts the identification information and the authentication information of the identification information and transmits the identification information; An authentication unit for authenticating a callback request based on the authentication information received through the communication network; And upon receiving authentication for the callback request from the authentication unit, sets a first call with the receiver terminal based on the identification information of the receiver terminal received through the communication network, and based on the identification information of the caller terminal. A call connection unit for setting a second call with the calling terminal and establishing a communication path for a callback call by connecting the first call with the second call.

Preferably, the short message includes the identification information, the information separator and the authentication information of the receiver terminal.

Preferably, the message processing unit, the receiving unit for receiving the short message; A callback confirmation unit detecting the authentication information from the received short message and confirming whether the received short message is the callback request message; And when the received short message is identified as the callback request message, transmits authentication information extracted from the short message to the authentication unit, and the identification information of the receiver terminal extracted from the short message and the caller added to the short message. And a transmission unit for transmitting identification information of the terminal to the call connection unit.

Preferably, the authentication unit and the call connection unit is installed in an area where a communication network for providing a communication service for the receiver terminal is established.

Preferably, a preferred embodiment of the callback service system using a short message according to the present invention is based on the billing period from the connection point of the callback call to the end point of the callback call for the first and second calls And a charging unit for calculating a service fee and subtracting the service fee from the available amount corresponding to the authentication information.

Another preferred embodiment of the callback service system using the short message according to the present invention, in response to a callback request from the first country to the second country, identification information of the calling terminal to the first connection system located in the first country In the callback service system using a short message to request the connection of the callback call by the first call connection system that has approved the callback request on the basis of the authentication information by transmitting identification information, and authentication information of the receiver terminal, Message receiving unit for receiving a short message from the caller terminal; A callback confirmation unit detecting the authentication information from the received short message and confirming whether the received short message is the callback request message; An information extracting unit extracting callback request information including identification information of a calling party terminal, identification information of a receiver terminal, and authentication information from the received short message when the received short message is confirmed as the callback request message; And a message transmitter for transmitting the extracted callback request information to the first call connection system through a communication network.

Preferably, the short message includes the identification information, the information separator and the authentication information of the receiver terminal.

Preferably, another preferred embodiment of a callback service system using a short message according to the present invention is a billing table for a call from the first country to the second country and from the second country to the first country. A storage unit for storing a billing table for international calls, including a billing table for calls; And identifying the first country in which the receiver terminal is located based on a country code included in the identification information of the receiver terminal, and based on the charging table between the first country and a second country in which the calling party terminal is located. If the service charge for the call from the first country to the second country is lower than the service charge for the call from the second country to the first country, the first call connection system is determined as the call service system. If the service charge for the call from the first country to the second country is higher than the service charge for the call from the second country to the first country, the second call connection system located in the second country is referred to as the call service system. And a service system determination unit for determining the message transmission unit to the extracted call service system by the service system determination unit. It transmits the requested information.

In order to achieve the above another technical problem, a preferred embodiment of the callback service method using the short message according to the present invention comprises a first location located in the first country in response to a callback request from the first country to the second country. Requesting connection of the callback call by the first call connection system that has approved the callback request based on the authentication information by transmitting identification information of the calling terminal, identification information of the receiver terminal, and authentication information to the call connection system; A callback service method using a short message, the method comprising: (a) receiving a short message from the calling terminal; detecting whether the received short message is the callback request message by detecting the authentication information from the received short message; (c) if the received short message is identified as the callback request message, extracting callback request information including identification information of the calling party terminal, identification information of the receiver terminal, and authentication information from the received short message; And (d) transmitting the extracted callback request information to the first call connection system through a communication network.

Preferably, a preferred embodiment of the callback service method using a short message according to the present invention, (e) the first call connection system authenticating a callback request based on the authentication information received through the communication network; ; And (f) after performing authentication on the callback request, the first call connection system establishes a first call with the receiver terminal based on identification information of the receiver terminal received through the communication network, and the caller And establishing a second call with the caller terminal based on the identification information of the terminal, and establishing a communication path for the callback call by connecting the first call with the second call.

Preferably, a preferred embodiment of the callback service method using a short message according to the present invention, (g) the first and the second based on the billing period from the connection point of the callback call to the end point of the callback call; Calculating a service charge for the second service and subtracting the service charge from the available amount corresponding to the authentication information.

Preferably, the short message includes the identification information, the information separator and the authentication information of the receiver terminal.

Preferably, the step (b) comprises the steps of: (b1) detecting information consecutive to the information separator based on the information separator as the authentication information; And (b2) confirming whether the received short message is the callback request message by checking whether the number of digits of the detected authentication information or the detected authentication information matches the issued authentication information.

Preferably, the step (d) comprises: (d1) identifying the first country in which the receiver terminal is located based on a country code included in the identification information of the receiver terminal; And (d2) if the service charge for the call from the first country to the second country is lower than the service charge for the call from the second country to the first country, the extracted call to the first call connection system. And transmitting callback request information.

Another preferred embodiment of the callback service method using a short message according to the present invention comprises the steps of: (a) receiving a short message from a calling terminal; (b) detecting authentication information from the received short message and confirming whether the received short message is the callback request message; (c) if the received short message is identified as the callback request message, extracting callback request information including identification information of the calling party terminal, identification information of the receiver terminal, and authentication information from the received short message; (d) performing authentication on a callback request based on the extracted authentication information; And (e) setting up a first call with the receiver terminal on the basis of the extracted identification information of the receiver terminal after performing authentication on the callback request, and based on the identification information of the extracted caller terminal. And establishing a second call with the terminal and establishing a communication path for a callback call by connecting the first call with the second call.

Accordingly, the user can be provided with a callback service using a text message without going through a complicated procedure.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a callback service system and method using a short message according to the present invention.

1 is a diagram showing the configuration of a network having a callback service system using a short message according to the present invention.

Referring to FIG. 1, the entire network includes a first network 100 located in a first country and a second network 190 located in a second country. The first network 100 and the second network 190 are connected through the Internet 145 and the International Private lease line (IPLC) 150. The first network 100 is the calling terminal 110, SMS gateway 115, authentication server 120, SMS application server 250, base station 130, user terminal 135, and public telephone network (PSTN) ( 140). The second network 190 includes a callback server 150, an authentication server 155, an exchange station 160, a user terminal 165, a receiver terminal 170, a base station 175, and a public telephone network 180. .

The sender creates and sends a short message including the phone number, information separator, and authentication number of the receiver terminal 170 using his terminal 110. The short message is added to the phone number of the calling terminal 110 is transmitted to the SMS gateway 115. The SMS gateway 115 transmits the received short message to the SMS application server 125. The SMS application server 125 extracts the authentication number from the short message and confirms the callback request message and transmits the authentication number to the authentication server 155 provided in the second country when the received short message is confirmed as the callback request message. . At this time, the authentication number may be transmitted to the authentication server 155 through the callback server 150 provided in the second country. In addition, the SMS application server 125 extracts the telephone numbers of the receiver terminal 170 and the calling terminal 170 from the short message and transmits it to the callback server 150 provided in the second country. On the other hand, SMS application server 125 transmits the authentication number to the authentication server 120 provided in the first country, when receiving the authentication signal from the authentication server 120 from the short message from the receiver terminal 170 and the sender terminal The telephone number of 170 may be extracted and transmitted to the callback server 150 provided in the second country.

The callback server 150 provided in the second country transmits the received telephone number of the receiver terminal 170 to the switching center 160. Switching station 160 connects a call with receiver terminal 170. At this time, if the receiver terminal 170 is a general telephone, the call is connected through the public telephone network 185. If the receiver terminal 170 is a mobile telephone, the call is connected through the base station 175 via the mobile communication company system 180. . On the other hand, the callback server 160 connects the call with the caller terminal 110 through the IPLC (185) or the Internet (145). At this time, the call between the callback server 160 and the caller terminal 110 is implemented by the VoIP technology, VoIP technology can be easily understood by those of ordinary skill in the art to which the present invention belongs, detailed description thereof will be omitted. do. The call introduced into the first country is established through the base station 130 or the public telephone network 140 according to the type of the calling party terminal 110.

2 is a block diagram showing the configuration of an embodiment of a callback service system using a short message according to the present invention.

2, an embodiment of a callback service system using a short message according to the present invention includes a message processing unit 210, an authentication unit 220, a call connection unit 230, and a charging unit 240. .

The message processing unit 210 receives a short message from the caller terminal 110, extracts identification information of the caller terminal 110, identification information of the receiver terminal 170, and authentication information from the received short message via a communication network. send. The caller terminal 110 is a device capable of creating and transmitting a short message, and is provided with a unique telephone number to enable a voice call. The caller terminal 110 may be a mobile phone, a PDA, a wired or wireless telephone, a computer, or the like. In the case of a computer, the caller terminal 110 should have a function of providing a voice call function through a line to which a unique telephone number is assigned. The receiver terminal 170 may be a wired / wireless telephone, a mobile phone, a PDA, etc. as a device capable of making a voice call, and a device used as the caller terminal 110 may be used as the receiver terminal 170.

The message processing unit 210 receives a short message from the caller terminal 110 through wired or wireless communication only. 3 shows an example of a short message. Referring to FIG. 3, the short message 300 includes a phone number 310, an information separator 320, and a PIN number 330 of the receiver terminal, and the phone number of the caller terminal is a short message ( 300). '/' Is used as the information separator 320, but a letter or symbol that can be distinguished from a phone number or an authentication number of a receiver terminal may be used as the information separator 320. The message processing unit 210 is preferably provided in the SMS gateway 115.

4 is a block diagram illustrating a detailed configuration of the message processing unit 210.

Referring to FIG. 4, the message processor 210 includes a receiver 410, a callback checker 420, and a transmitter 430.

The receiver 410 receives a short message transmitted from the caller terminal 110. The callback confirmation unit 420 detects the authentication number from the received short message and checks whether the received short message is a callback request message. At this time, the callback confirmation unit 420 detects an authentication number consisting of letters, numbers, symbols, etc., following the information separator based on the information separator included in the short message. The callback confirmation unit 420 confirms whether the received short message is a callback request message based on the detected authentication number type. At this time, if the received short message is confirmed as a callback request message, the callback confirmation unit 420 transmits the extracted authentication number to the authentication unit 220, and transmits the phone numbers of the caller terminal 110 and the receiver terminal 170. Transmission to the call connection unit 230. On the contrary, if it is confirmed that the received short message is not a callback request message, the callback confirmation unit 420 transmits or discards the received short message to an SMS server (not shown).

The authentication number is a unique number that the caller has been given in advance from the callback service system, and the callback service system transmits the authentication number assigned to the caller to the authentication unit 220. The verification number is listed on the prepaid card and provided to the sender. In addition, a method in which an authentication number is assigned to a caller who accesses a callback service system and inputs a payment means may be adopted. In this case, the callback service system will settle the call charge later.

When the short message received by the callback confirmation unit 420 is confirmed as the callback request message, the transmission unit 430 transmits the authentication number extracted from the short message to the authentication unit 220, and extracts the recipient terminal (extracted from the short message) ( 170, the phone number and the phone number of the caller terminal 110 is added to the short message is transmitted to the call connection unit 230.

The authentication unit 220 authenticates the callback request based on the authentication number received through the communication network. The authentication unit 220 stores an authentication number issued by the callback service system, and the authentication unit 220 transmits an authentication confirmation signal to the call connection unit 230 when an authentication number received through the communication network exists among the stored authentication numbers. To provide. If the authentication for the callback request fails, the authentication unit 220 transmits an authentication failure message including a description of the cause of the authentication failure to the calling terminal 110. The reasons for the authentication failure include an error in the authentication number, a lack of available fee corresponding to the authentication number (including a case where an available fee exists but does not meet the minimum standard amount).

When the call connection unit 230 receives the authentication confirmation signal from the authenticator 220, the call connection unit 230 establishes a call between the receiver terminal 170 based on the telephone number of the receiver terminal 170 received through the communication network. In addition, the call connection unit 230 establishes a call between the caller terminal 110 based on the received phone number of the caller terminal 110. Finally, the call connection unit 230 establishes a communication path for the callback call between the caller terminal 110 and the receiver terminal 170 by connecting the set call.

The billing unit 240 calculates a service fee for a call with the receiver terminal 170 and the caller terminal 110 based on the billing period from the connection point of the callback call to the end point, and can use the prepaid card corresponding to the authentication number. Deduct the service charge from the amount. In this case, the authentication number is provided on the prepaid card and provided to the sender. Therefore, the charging unit 240 deducts the service fee from the available amount of the prepaid card to which the corresponding authentication number is assigned. On the contrary, when the service fee is settled by a postpaid payment means such as a credit card, the charging unit 240 charges the calculated service fee to the holder of the credit card corresponding to the corresponding authentication number. On the other hand, after deducting the service fee and the service fee, it is preferable that the settlement statement including the balance of the prepaid card is notified to the sender. The settlement history may be prepared by the charging unit 240 and transmitted by the short message to the caller terminal 110 through the message processing unit 210.

In the above-described embodiment, when the caller terminal 110 is located in the first country and the receiver terminal 170 is located in the second country, the message processing unit 210 is installed in the first country and the call connection unit 230 and The charging unit 240 is installed in the second country. The authentication unit 220 may be selectively installed in the first country or the second country, and further, the callback confirmation unit 420 of the message processing unit 210 may be configured to perform the function of the authentication unit 220. .

5 is a block diagram showing the configuration of another preferred embodiment of a callback service system using a short message according to the present invention. The callback service system shown in FIG. 5 is a first connection system located in a first country in response to a callback request from a first country to a second country. Send a request for the callback call connection by the first connection system that approved the callback request based on the authentication number.

Referring to Figure 5, another preferred embodiment 500 for a callback service system using a short message according to the present invention, the message receiving unit 510, callback confirmation unit 520, information extraction unit 530, message transmission A unit 540, a storage unit 550, and a service system determination unit 560. The configuration and function of the message receiver 510 and the callback confirmation unit 520 are the same as those of the message processing unit 210 and the callback confirmation unit 220 described with reference to FIG.

When the received short message is confirmed as a callback request message, the information extracting unit 530 extracts callback request information including a phone number of the calling party terminal 110, a phone number of the called terminal, and an authentication number from the received short message. do. The message transmitter 540 transmits the extracted callback request information to the first call connection system 580 through a communication network.

The first call connection system 580 sets up a call to the caller terminal 110 located in the first station and a call to the callee terminal 170 located in the second station based on the received callback call request information. Connect to establish a communication path between the sender terminal 110 and the receiver terminal 170. The first call connection system 580 includes an authentication unit, a call connection unit, a charging unit, and the like, and the configuration and function of each component are the same as those described with reference to FIG. 4. At this time, the authentication unit may be provided in the first call connection system 580 or may be provided separately from the first call connection system 580. In addition, the authentication unit may be provided in the first station or the callback confirmation unit 520 may perform authentication for the callback request from the calling terminal 110 based on the authentication number. In this case, the authentication result is transmitted from the authenticator through the communication network to the first call connection system 580 or through the message transmitter 540 together with the callback request information to the first call connection system 580.

The storage unit 550 stores a billing table for inter-country calls including a billing table for calls from a first country to a second country and a billing table for calls from a second country to a first country.

The service system determination unit 560 checks the first country in which the receiver terminal 170 is located based on the country code included in the phone number of the receiver terminal 170, and the first country and the calling party terminal 110 are located. If the service charge for the call from the first country to the second country is lower than the service charge for the call from the second country to the first country, based on the billing table between the second countries, the first connection system 580 is determined. Determined by call service system. In contrast, the service system decision unit 560 determines whether the service fee for the call from the first country to the second country is higher than the service fee for the call from the second country to the first country. The call connection system 590 is determined as a call service system. In this case, the message transmission unit 540 transmits the callback request information extracted to the call service system determined by the service system determination unit 560. The second connection system 590 has the same configuration as the first connection system 580.

In the embodiment described with reference to FIG. 5, the callback service system may be integrated into the SMS gateway 115. Meanwhile, the message receiver 510 may be installed in the SMS gateway 115 and other components may be configured to configure a separate callback service server 130.

6 is a flowchart illustrating a preferred embodiment of a callback service method using a short message according to the present invention.

Referring to FIG. 6, the message receiver 510 receives a short message from the caller terminal 110 located in the second country (S600). The callback confirmation unit 520 detects an authentication number from the received short message and checks whether the received short message is a callback request message (S610). At this time, the callback confirmation unit 520 detects the information consecutive to the information separation code as the authentication number based on the information separation code included in the short message, and the number of digits of the detected authentication number or the detected authentication information and issuance issued. Check whether the received short message is a callback request message by checking whether the received authentication information matches. The information extraction unit 530, if the received short message is confirmed as a callback request message, a callback request including a phone number of the calling party terminal 110, a phone number of the receiver terminal 170, and an authentication number from the received short message. Information is extracted (S620). If it is confirmed that the received short message is not a callback request message, the callback confirmation unit 520 transmits or discards the short message to an SMS server (not shown) (S625).

The service system determination unit 560 checks the first country in which the receiver terminal 170 is located based on the country code included in the telephone number of the receiver terminal 170 extracted from the short message (S630). The service system determination unit 560 compares the service fee for the call from the first country to the second country where the calling party terminal 110 is located and the service fee for the call from the second country to the first country (S640). . If the service charge for the call from the first country to the second country is low, the first call connection system 580 is determined as the call service system (S645). In contrast, the service system determination unit 560 determines that the service fee for the call from the first country to the second country where the calling party terminal 110 is located is higher than the service fee for the call from the second country to the first country. The call connection system 590 is determined as a call service system (S650). The message transmitter 540 transmits callback call request information to the determined call service system (S660).

The first call connection system 580 or the second call connection system 590 determined as the call service system authenticates the callback request based on the authentication number received through the communication network (S670). In addition, the first call connection system 580 or the second call connection system 590 determined as a call service system based on the telephone number of the receiver terminal 170 received through the communication network after performing authentication for the callback request. Set a call with the receiver terminal 170, set a call with the caller terminal 110 based on the phone number of the caller terminal 110, and establishes a communication path for the callback call by connecting the set call (S680) .

Finally, the first connection system 580 or the second connection system 590 determined as the call service system calculates a service fee for each call based on the billing period from the connection point to the termination point of the callback call. The service fee is subtracted from the available amount of the prepaid card corresponding to the authentication number (S690).

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific preferred embodiments described above, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

According to the callback service system and method using a short message according to the present invention, a user can be provided with a callback service at a low cost by using a short message without having to perform a complicated dialing process. In addition, since the user uses the short message, the user does not have to wait until the ringing tone is heard, thereby ensuring the convenience of the user. Furthermore, telecommunications operators can gain a competitive advantage over other telecommunications operators by providing services using a system of a country that can provide international telephone services at a lower cost based on phone rates between countries.

1 is a block diagram showing the configuration of an embodiment of a callback service system using a short message according to the present invention;

2 is a diagram illustrating an example of a short message;

3 is a block diagram showing a detailed configuration of the message processing unit 110;

Figure 4 is a block diagram showing the configuration of another preferred embodiment for a callback service system using a short message according to the present invention, and

5 is a flowchart illustrating a preferred embodiment of a callback service method using a short message according to the present invention.

Claims (15)

A message processing unit which receives a short message from the calling terminal, extracts identification information of the calling terminal, identification information of the receiver terminal, and authentication information from the received short message and transmits the same through the communication network; An authentication unit for authenticating a callback request based on the authentication information received through the communication network; And Upon receiving the authentication for the callback request from the authentication unit, a first call with the receiver terminal is set based on the identification information of the receiver terminal received through the communication network, and based on the identification information of the caller terminal. And a call connection unit for establishing a second call with a caller terminal and establishing a communication path for a callback call by connecting the first call with the second call. The method of claim 1, The short message is a callback service system using a short message, characterized in that the identification information, the information separator and the authentication information of the receiver terminal. The method of claim 1, The message processing unit, Receiving unit for receiving the short message; A callback confirmation unit detecting the authentication information from the received short message and confirming whether the received short message is the callback request message; And When the received short message is confirmed as the callback request message, the authentication information extracted from the short message is transmitted to the authentication unit, and identification information of the receiver terminal extracted from the short message and the caller terminal are added to the short message. Callback service system using a short message comprising a; transmission unit for transmitting the identification information of the call connection unit. The method of claim 1, The authentication unit and the call connection unit is a callback service system using a short message, characterized in that installed in the area where the communication network for providing a communication service for the receiver terminal. The method of claim 1, The service fee for the first and second calls is calculated based on the billing period from the connection point of the callback call to the end point of the callback call, and the service fee is subtracted from the available amount corresponding to the authentication information. Callback service system using a short message, characterized in that it further comprises; In response to the callback request from the first country to the second country, the identification information of the calling party terminal, the identification information of the receiver terminal, and the authentication information are transmitted to the first call connection system located in the first country based on the authentication information. In the callback service system using a short message requesting the connection of the callback call by the first call connection system that has approved the callback request, Message receiving unit for receiving a short message from the caller terminal; A callback confirmation unit detecting the authentication information from the received short message and confirming whether the received short message is the callback request message; An information extracting unit extracting callback request information including identification information of a calling party terminal, identification information of a receiver terminal, and authentication information from the received short message when the received short message is confirmed as the callback request message; And And a message transmitter for transmitting the extracted callback request information to the first call connection system through a communication network. The method of claim 6, The short message is a callback service system using a short message, characterized in that the identification information, the information separator and the authentication information of the receiver terminal. The method of claim 6, A storage unit for storing a billing table for inter-country calls including a billing table for calls from the first country to the second country and a billing table for calls from the second country to the first country; And Identify the first country in which the receiver terminal is located based on a country code included in the identification information of the receiver terminal; and based on the billing table between the first country and a second country in which the calling party terminal is located. If the service charge for the call from the country to the second country is lower than the service charge for the call from the second country to the first country, the first call connection system is determined as the call service system, and the first If the service charge for the call from the state to the second country is higher than the service charge for the call from the second country to the first country, the call connection system located in the second country is determined as the call service system. Further comprising a; service system determination unit, The message transmitting unit transmits the extracted callback request information to the call service system determined by the service system determining unit. In response to the callback request from the first country to the second country, the identification information of the calling party terminal, the identification information of the receiver terminal, and the authentication information are transmitted to the first call connection system located in the first country based on the authentication information. In the callback service method using a short message requesting connection of the callback call by the first call connection system that has approved the callback request, (a) receiving a short message from the calling terminal; detecting whether the received short message is the callback request message by detecting the authentication information from the received short message; (c) if the received short message is identified as the callback request message, extracting callback request information including identification information of the calling party terminal, identification information of the receiver terminal, and authentication information from the received short message; And (d) transmitting the extracted callback request information to the first call connection system through a communication network; and a callback service method comprising a short message. The method of claim 9, (e) authenticating, by the first call connection system, a callback request based on the authentication information received through the communication network; And (f) after performing authentication on the callback request, the first call connection system establishes a first call with the receiver terminal based on the identification information of the receiver terminal received through the communication network, and the caller terminal. Establishing a second call with the caller terminal based on the identification information of the caller, and establishing a communication path for a callback call by connecting the first call with the second call; Callback service method using message. The method of claim 10, (g) calculating the service charge for the first and second calls based on the billing period from the point of connection of the callback call to the end of the callback call and calculating the service charge from the available amount corresponding to the authentication information. Deducting a; Callback service method using a short message, characterized in that it further comprises. The method of claim 9, The short message is a callback service method using a short message, characterized in that the identification information, the information separator and the authentication information of the receiver terminal. The method of claim 12, In step (b), (b1) detecting information consecutive to the information separator based on the information separator as the authentication information; And (b2) confirming whether the received short message is the callback request message by checking whether the number of digits of the detected authentication information or the detected authentication information matches the issued authentication information. Callback service method using a short message. The method of claim 9, In step (d), (d1) identifying the first country in which the receiver terminal is located based on a country code included in the identification information of the receiver terminal; And (d2) if the service charge for the call from the first country to the second country is lower than the service charge for the call from the second country to the first country, the extracted callback to the first call connection system. Sending the request information; Callback service method using a short message comprising a. (a) receiving a short message from a calling terminal; detecting whether the received short message is the callback request message by detecting authentication information from the received short message; (c) if the received short message is identified as the callback request message, extracting callback request information including identification information of the calling party terminal, identification information of the receiver terminal, and authentication information from the received short message; (d) performing authentication on a callback request based on the extracted authentication information; And (e) after authenticating the callback request, establish a first call with the receiver terminal based on the extracted identification information of the receiver terminal, and based on the extracted identification information of the called terminal, And establishing a second call, and establishing a communication path for a callback call by connecting the first call to the second call and using the short message.