KR20100094813A - System and method providing extension switching service by intelligent network system - Google Patents

Abstract

PURPOSE: A method and a system for providing an extension switching service by an intelligent network system are provided to immediately connect a call with a corresponding receiver if a caller attempts the call to an extension number from the outside. CONSTITUTION: A common switch requests an extension switch service of an originating terminal by an intelligent network device(S403). The intelligent network device checks PBX routing information based on identification information of the originating terminal(S405). The intelligent network device transmits the common switch routing information to the common switch(S407). The common switch requests call connection to a PBX using the routing information(S409). The common switch sets a call between an extension terminal corresponding to the extension number and the originating terminal.

Description

Method and system for providing extension service using intelligent network system {SYSTEM AND METHOD PROVIDING EXTENSION SWITCHING SERVICE BY INTELLIGENT NETWORK SYSTEM}

The present invention relates to an extension exchange service providing technology, and more particularly, to a method and system for providing an extension exchange service to a mobile terminal using an intelligent network system in a communication network.

In general, a business employing a large number of employees establishes a private exchange to integrate and manage internal telephones. The internal switch connects a plurality of internal telephones. Each line to which the internal telephones are connected is assigned an independent extension telephone number rather than a public telephone number. In addition, one private exchange is established in a single workplace that can connect dozens of people, but a company having multiple workplaces in each region or country establishes a plurality of private exchanges in order to connect tens of thousands of station terminals.

Such a private exchange handles a call to be performed between users when an extension telephone number is input without passing through an external communication network. That is, when a user inside a workplace attempts a call to an extension terminal, the call is set up through the private exchange without using a public network that charges a separate fee. In this way, the private exchange can be given a separate independent internal telephone number on the administrative side, and in charge, it is widely used in the workplace because it does not charge a call fee for calls established between internal lines.

However, if a specific user wants to try to call the extension terminal of his workplace from the outside, he must first try to call the representative telephone number of the workplace and then enter the extension number additionally, or inform the receptionist's name. . The former is a case where a call is transmitted from a private exchange when a call is connected to a representative telephone number of a workplace, and the caller enters an extension number according to the announcement and calls the called party. In the latter case, the call is first received when the call is connected to the representative phone number of the operator. The caller first establishes a call by calling the guide and requesting the guide to connect with the called party.

However, this conventional method requires a double action from the caller outside, causing inconvenience to the caller. In particular, the method of specifying the guide as a telephone connector also has the problem of wasting the guide's labor in unnecessary places.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide a method and system for providing an extension exchange service using an intelligent network system that immediately connects a caller with a corresponding caller when a caller attempts to call an extension from the outside. .

In addition, another object of the present invention is to provide a method and system for providing an extension exchange service capable of establishing a low-cost international call based on a public IP network and a private network.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above object, a method for providing an extension exchange service in a communication system including a private exchange, a common exchange, and an intelligent network device according to the first aspect of the present invention is provided. Receiving a call connection request that is an extension number; (b) requesting, by the common exchange, the extension exchange service of the calling terminal to the intelligent network device; (c) checking, by the intelligent network device, the private exchange routing information based on the identification information of the calling terminal, and transmitting the private exchange routing information to the common exchange; And (d) requesting a call connection to the private exchange using the routing information to establish a call between the extension terminal corresponding to the extension number and the calling terminal.

A system for providing an extension exchange service to a mobile terminal according to a second aspect of the present invention for achieving the above object comprises: an intelligent network device for storing and managing private network information for each terminal; And receiving a call connection request from the calling terminal with the extension number, requesting an extension exchange service from the intelligent network device to receive the private exchange routing information of the calling terminal, and using the routing information to the private exchange. And requesting a call connection to establish a call between the extension terminal corresponding to the extension number and the calling terminal.

The present invention establishes an instant call between the caller who attempts to connect to the extension number from the outside and the called party corresponding to the extension number, and connects to the representative telephone number of the conventional private network, and then enters the extension number to the attendant secondly. This has the advantage of eliminating the caller's hassle to announce the name of the called party.

In addition, the present invention provides a call forwarding service between the mobile terminal and the extension terminal, there is an advantage that allows the user to receive an incoming call connected to the extension terminal from the outside.

In particular, the present invention provides the user with an international call service set up through a private network and a public IP network, thereby saving the user's international call cost.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred 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 system for providing an extension exchange service to an originating terminal using an intelligent network system in a mobile communication network according to an embodiment of the present invention.

As shown in FIG. 1, the extension exchange service system according to the preferred embodiment of the present invention includes a base station 120, a base station controller 130, a common exchange 140, a private exchange 150, and a home location register (HLR). Home Location Register (160) and intelligent network system (170).

The mobile terminal 110 may attempt to connect to another mobile terminal 110 by wirelessly communicating with the base station 120, and may try to connect to the extension terminal 180 by inputting an extension number. The mobile terminal 110 includes a PDA, a cellular phone, a PCS phone, a GSM phone, a WCDMA phone, a DMB phone, a Wibro phone, a Wifi phone, and the like.

The extension terminal 180 may be connected to the private exchange 150 and may call the other extension terminal 180 of the private network by attempting to connect a call by inputting an extension number.

The base station 120 is a BTS (Base Station Transceiver Subsystem) or NodeB, and is controlled by the base station controller 130 to transmit / receive radio signals, radio channel encoding and decoding, signal strength and quality measurement, baseband signal processing, radio resource management, and Perform self maintenance functions.

The base station controller 130 is responsible for allocating and releasing radio channels for the mobile station 110, controlling transmission outputs of the mobile station 110 and the base station 120, determining intercell soft handoff and hard handoff, transcoding and It performs vocoding, operation and maintenance functions for the base station 120, and the like. The base station controller 130 is a base station controller (BSC) or a radio network controller (RNC).

The common exchange 140 is a mobile switching center (MSC) or a serving GPRS support node (SGSN), and provides an interface function with the base station controller 130, and controls voice calls, data transmission, and various additional services. In addition, the common exchange 140 handles the call connection of the mobile terminal 110, and provides a connection function with other external networks or private networks.

In particular, when the common exchange 140 receives a call connection request including the extension number from the mobile terminal 110, the common switch 140 transmits the extension number and the identification number of the mobile terminal 110 to the intelligent network system 170. Accordingly, the routing information of the corresponding private exchange 150 is received and a call connection is requested to the private exchange 150 corresponding to the routing information. In addition, when the extension terminal 180 is switched to the mobile terminal 110, the common exchange 140 receives the called party's mobile terminal identification number from the intelligent network system 170 instead of the routing information of the private exchange 150. Then, it attempts to connect the call to the mobile terminal 110 of the identification number.

The private exchange 150 is located at a particular workplace and provides the call service to the user of that workplace. In particular, when the private exchange 150 receives the call connection request including the extension number from the common exchange 140, it attempts to connect the call to the called terminal corresponding to the extension number. In addition, when the private exchange 150 receives a call connection request including the identification number and country information of the mobile terminal 110 from the common exchange 140, the private exchange 150 calls the private exchange 150 of the other country corresponding to the country information. Ask for consolation. Meanwhile, the private exchange 150 belonging to a specific company may be installed by region or country. The private exchanges 150 installed for each country are connected through the public IP network 100, and thus, the private exchanges 150 between countries communicate with each other through the public IP network 100 instead of the international line.

The home location register 160 stores location information and subscriber profile information of the mobile terminal 110. In addition, the home location register 160 stores the presence or absence of the extension service for each mobile terminal (110).

The intelligent network system 170 includes a Service Control Point (SCP) and a Service Switching Point (SSP), and provides an extension exchange service to the mobile terminal 110. Specifically, when the intelligent network system 170 receives the identification number of the originating terminal and the extension number of the called party from the common exchange 140, the intelligent network system 170 checks whether the called party has set the call forwarding from the extension terminal 180 to the mobile terminal 110. When the incoming call is transferred to the mobile terminal 110, the common exchange 140 transmits the identification number of the mobile terminal 110. At this time, the intelligent network system 170 additionally transmits the private exchange routing information of the calling terminal and the national information of the mobile terminal 110 to the common exchange 140 when the forwarded mobile terminal 110 is located outside the country. . On the other hand, the intelligent network system 170 transmits the private exchange routing information and the extension number of the calling terminal to the common exchange 140, if the call forwarding is not set to the mobile terminal (110).

The intelligent network system 170 receives and stores extension exchange service data such as private network information, a mobile terminal identification number, and an extension number of a user who subscribes to an intelligent network service from a customer information system (not shown). That is, when a user visits a dealer or subscribes to an extension exchange service through the Internet, and inputs the mobile terminal identification number, the private network information of the user, the mobile terminal identification number, and his extension number, etc., the customer information system. Transmits the extension exchange service data to the intelligent network system 170, and the intelligent network system 170 stores the extension exchange service data. In addition, the intelligent network system 170 receives and stores the mobile terminal identification number and the country information that the incoming call of the extension terminal is received when the call transfer from the user who requested the call transfer.

2 is a diagram illustrating a mapping table for an extension exchange service stored in an intelligent network system according to an embodiment of the present invention.

As shown in FIG. 2, the mapping table for the extension exchange service (hereinafter referred to as the "extension exchange table") is the private network information 210, the private exchange routing information 220, the extension number 230, the called mobile number. 240, country information 250, call forwarding activation information 260, and subscriber terminal information 270.

The private network information field 210 indicates private network information of a specific company group, and classifies each company that has built a private network. In addition, the private exchange routing information field 220 records routing information of each private exchange 150 installed in the country, and the extension number field 230 of the extension terminal 180 connected through the specific private exchange 150. Record your extension.

The called mobile number field 240 records the mobile terminal 110 identification number of the user who requested the call transfer from the extension terminal 180 to the mobile terminal 110, and the country information field 250 indicates the forwarded mobile terminal ( Record the country information where 110 is located. In addition, the call forward activation field 260 records information on whether call forwarding is activated. In addition, the subscriber station field 270 records the mobile terminal identification number of the user subscribed to the extension exchange service.

3 is a flowchart illustrating a method for providing an extension exchange service to a mobile terminal in an intelligent network system according to an embodiment of the present invention.

Referring to FIG. 3, the intelligent network system 170 receives an IDP (Initial Detection Point) message including the identification number of the calling terminal and the extension number of the called terminal from the common exchange 140 (S301). Then, the intelligent network system 170 checks the private network information 210 corresponding to the identification number of the calling terminal in the extension exchange table (S303). That is, the intelligent network system 170 checks the identification number corresponding to the calling number in the subscriber station field 270 and checks the private network corresponding to the identification number in the private network information field 210. For example, if the calling number is 010-1111-XXXX, the intelligent network system 170 confirms that the private network information of the calling terminal is A company.

Next, the intelligent network system 170 checks whether the called terminal corresponding to the extension number is forwarded call forward activated (S305). Specifically, the intelligent network system 170 checks the extension number corresponding to the extension number received in step S301 from the extension number field 230 of the private network corresponding to the calling number, and activates the call forwarding corresponding to the extension number. Check that the information is "true" or "false".

The intelligent network system 170 checks whether the incoming call is activated or switched (ie, when the call forwarding activation information is true), whether the location of the forwarded mobile terminal 110 is international or domestic (S307). . That is, the intelligent network system 170 checks whether domestic information or other country information is recorded in the country information field 250 corresponding to the extension number. Subsequently, when the mobile terminal 110 is located in a foreign country, the intelligent network system 170 routes a domestic private exchange that corresponds to an identification number (foreign identification number), country information, and the private network information of the mobile terminal 110. Information is included in the connect message and the connection message is transmitted to the common exchange 140 (S309). On the other hand, the intelligent network system 170 includes the identification number (that is, the domestic identification number) of the mobile terminal 110 in the access message, if the forwarded mobile terminal 110 is located in the domestic, and the access message is shared The transfer to the exchange 140 (S313).

On the other hand, the intelligent network system 170 accesses the private exchange routing information corresponding to the extension number and the private network of the calling terminal when the call forwarding of the called terminal is deactivated (that is, the call forwarding activation information is false) in step S305. The message is included in the message and the connection message is transmitted to the common exchange 140 (S311).

Hereinafter, a method for providing an extension exchange service according to the present invention will be described in more detail with reference to FIGS. 4 to 7.

4 is a flowchart illustrating a method for setting up a call between a mobile station that attempts to connect a call to an extension number in an extension service system according to an embodiment of the present invention and a domestic extension terminal that is inactive for call forwarding.

In the following description with reference to FIGS. 4 and 5, the caller's mobile terminal will be described assuming 110a-1 of FIG. 1, the caller's mobile terminal 110a-2 and the caller's extension terminal 180a-1.

4, the common exchange 140 receives a call connection request whose extension number is the called number from the calling terminal 110a-1 (S401). Then, the common exchange 140 checks whether the calling terminal 110a-1 is subscribed to the extension exchange service. The common exchange 140 receives the extension exchange service subscription information of the calling terminal 110a-1 from the home location register 160 when registering the calling terminal 110a-1, and stores the information. . Preferably, the common exchange 140 stores the extension exchange service subscription information in a visitor location register (VLR), and whether the calling terminal 110a-1 is subscribed to the extension exchange service based on the subscription information. Check whether or not.

The common exchange 140, when the calling terminal 110a-1 is subscribed to the extension exchange service, an intelligent detection point (IDP) message including the extension number and the identification number of the calling terminal 110a-1 The system 170 transmits the data to the system 170 (S403). On the other hand, the common exchange 140, if the calling terminal (110a-1) is not subscribed to the extension exchange service, the terminal does not receive a message, such as "the number is not dialed now. Please check and try again." Transmit to 110a-1. Alternatively, the common exchange 140 transmits an extension exchange service unavailable message to the calling terminal 110a-1 such as "You are not subscribed to the extension exchange service. Please use the extension exchange service after joining."

The intelligent network system 170 receiving the IDP message checks the sender's private network information based on the identification number of the calling terminal 110a-1, and if the called terminal is not forwarded, the extension number in the private network. Routing information of the private exchange 150 corresponding to the extracted (S405). Subsequently, the intelligent network system 170 transmits a connect message including the extension number and the routing information of the extracted private exchange 150 to the common exchange 140 (S407).

Then, the common exchange 140 requests a call connection to the private exchange 150 corresponding to the routing information of the access message (S409). At this time, the common exchange 140 transmits the extension number to the private exchange 150. Then, the private exchange 150 attempts to connect the call to the extension terminal 180a-1 of the called party corresponding to the extension number (S411).

For example, assume that the intelligent network system 170 receives an IDP message including the originating number of 010-1111-XXXX and the extension number of 0033 from the common exchange 140 in step S403. Then, the intelligent network system 170 designates the calling terminal 110a-1 as its service network to the private network of the company A through the subscriber station field 270 and the private network information field 210 of the extension exchange table of FIG. 2. It is confirmed that the extension terminal 180a-1 of 0033 is forwarded inactivated through the call forwarding activation field 260. The intelligent network system 170 transmits the RN1 routing information corresponding to the private network information of the calling terminal 110a-1 to the common exchange 140. Then, the common exchange 130 requests the call establishment to the private exchange 150 corresponding to the routing information of the RN1, and the private exchange 150 connects the call with the extension terminal 180a-1 having the extension number of 0033. Try.

Through this process, even if the caller attempts to make a call by entering only the extension number from the outside, the caller can call the called party of the extension terminal 180a-1 belonging to his private network.

FIG. 5 is a flowchart illustrating a method for setting up a call between an originating terminal attempting a call to an extension number and a domestic mobile terminal which is switched to a call in an extension exchange service system according to an embodiment of the present invention.

Referring to FIG. 5, the common exchange 140 receives a call connection request whose extension number is the called number from the calling terminal 110a-1, and determines whether the calling terminal 110a-1 is subscribed to the extension exchange service. Check (S501). The common exchange 140, when the calling terminal 110a-1 is subscribed to the extension exchange service, sends an IDP (Initial Detection Point) message including the extension number and the identification number of the calling terminal 110a-1. Transfer to 170 (S503).

The intelligent network system 170 receiving the IDP message checks the sender's private network information based on the identification number of the calling terminal 110a-1, and the called party's extension terminal 180a-1 based on the private network information and the extension number. ) Is transferred to the mobile terminal 110a-2 and confirms that the mobile terminal 110a-2 is located outside the country (S505). Accordingly, the intelligent network system 170 extracts the identification number of the forwarded mobile terminal 110a-2, and transmits the access message including the identification number to the common exchange 140 (S507). Then, the common exchange 140 attempts to connect the call to the called party's mobile terminal 110a-2 corresponding to the mobile terminal identification number of the access message (S509).

For example, assume that the intelligent network system 170 receives an IDP message from the common exchange 140 including an originating number of 010-4444-XXXX and an extension number of 0110 in step S503. Then, the intelligent network system 170 recognizes that the calling terminal 110a-1 belongs to the private company B of the B company through the subscriber station field 270 and the private network information field 210 of the extension exchange table of FIG. It is confirmed that the extension terminal 180a-1 of 0110 is forwarded through the transfer activation field 260 and the mobile terminal 110a-2 forwarded through the country information field 250 is located in Korea. .

The intelligent network system 170 confirms that the extension terminal 180a-1 is forwarded to the domestic mobile terminal 110a-2. The mobile number 110 is called 010-XXXX-5555, which is the identification number of the mobile terminal 110a-2. It extracts from the field 240, and transmits the access message including the identification number to the common exchange 140. Then, the common exchange 130 attempts to connect the call to the called party's mobile terminal 110a-2 having the number 010-XXXX-5555.

In summary, when the called party sets the call forwarding from the extension terminal 180a-1 to the domestic mobile terminal 110a-2, the intelligent network system 170 replaces the extension number of the called party in response to an IDP message. The connection message including the identification number of the forwarded mobile terminal (110a-2) is transmitted to the common exchange 140, inducing the common exchange 140 to connect to the mobile terminal (110a-2). Such a call forwarding method may be set by the user accessing a specific server, and the call forwarding activation or call forwarding deactivation is performed by inputting a service shortcut key (for example, ** 1324) + a call button to the mobile terminal 110 or the extension terminal 180. Torch can be set. Then, the intelligent network system 170 receives the call forwarding information from the mobile terminal 110, the extension terminal 180 or a specific server to update the extension exchange table.

FIG. 6 is a flowchart illustrating a method for setting up a call between a mobile terminal that attempts to connect a call to an extension number in an extension exchange service system and an external extension terminal that is not forwarded to a call transfer according to an embodiment of the present invention.

In the following description with reference to FIGS. 6 and 7, the caller's mobile terminal will be described assuming 110a-1 of FIG. 1, the caller's mobile terminal 110b-1 and the caller's extension terminal 180b-1.

Referring to Figure 6, the domestic public exchange 140a receives a call connection request with the extension number is the destination number from the calling terminal (110a-1) subscribed to the extension exchange service, the extension number and the calling terminal (110a-) The IDP (Initial Detection Point) message including the identification number of 1) is transmitted to the intelligent network system 170 (S601 and S603).

Upon receiving the IDP message, the intelligent network system 170 checks the private network information of the calling terminal 110a-1, and if the extension terminal 180b-1 of the called party is deactivated, the domestic network corresponding to the private network information is transmitted. Routing information of the private exchange 150a is extracted (S605). Subsequently, the intelligent network system 170 transmits a connect message including the extension number and the routing information of the extracted domestic private exchange 150a to the common exchange 140a (S607).

Then, the domestic public exchange 140a requests a call connection to the domestic private exchange 150a corresponding to the routing information of the access message (S609). At this time, the domestic public exchange 140a transmits the extension number to the domestic private exchange 150a. Then, the domestic private exchange 150a requests a call connection to the foreign private exchange 150b that manages the line of the extension number based on the extension number (S611). At this time, the domestic private exchange 150a requests a call connection including the extension number to the foreign private exchange 150b through the public IP network 100. Also, the domestic private exchange 150a converts the message into a message commonly used in the public IP network 100 and requests the call connection request to the foreign private exchange 150b. For example, the domestic private exchange 150a converts an ISUP (ISDN User Part) based call request message into a TCP / IP or Session Initiation Protocol (SIP) based message commonly used in the public IP network 100, thereby converting a foreign private exchange ( 150b).

Then, the foreign private exchange 150b converts the call connection request message based on the public IP network 100 into a message commonly used in its communication network, and the extension terminal 180b-1 corresponding to the extension number of the call connection message. Attempt to connect to the call (S613).

That is, when the calling terminal 110 subscribed to the extension exchange service attempts to make a call to an external extension number, the calling terminal 110a-1 is a domestic public exchange 140a, a domestic private exchange 150a, a public IP network ( 100) and the call to the extension terminal 180b-1 of the called party are established via the foreign private exchange 150a.

7 is a flowchart illustrating a method for setting up a call between an originating terminal attempting a call to an extension number and a mobile station of a call forwarded station in an extension exchange service system according to an embodiment of the present invention.

Referring to FIG. 7, the domestic common exchange 140a receives a call connection request whose extension number is the called number from the calling terminal 110a-1 subscribed to the extension exchange service, and the extension number and the calling terminal 110a-. The IDP (Initial Detection Point) message including the identification number of 1) is transmitted to the intelligent network system 170 (S701 and S703).

Then, the intelligent network system 170 checks the sender's private network information based on the identification number of the calling terminal 110a-1, and the extension terminal 180b-1 of the called party is the mobile terminal based on the private network information and the extension number. Call forward to (110b-1) and confirm that the mobile terminal (110b-1) is located in the foreign country (S705). Subsequently, the intelligent network system 170 extracts the called party's mobile terminal 110b-1 identification number (i.e., foreign identification number), the country information where the mobile terminal 110b-1 is located, and the domestic exchange routing information of the private network. . The intelligent network system 170 transmits the access message including the extracted domestic exchange routing information, the called party's mobile terminal identification number, and the country information to the domestic public exchange 140a (S707).

Next, the domestic common exchange 140a transmits a call connection request message including the called party's mobile terminal identification number and country information to the domestic private exchange 150a based on the domestic private exchange routing information of the received access message. (S709). Then, the domestic private exchange 150a transmits a call connection request message to the private exchange 140b established in a country matching the country information among the foreign private exchanges included in its private network (S711). At this time, the domestic private exchange 150a includes the called party's mobile communication identification number in the call connection request message, and converts it into a form commonly used in the message public IP network 100 and transmits it to the foreign private exchange 150b. .

Then, the foreign private exchange 150b converts the call connection request message based on the public IP network 100 into a message commonly used in its communication network, and the converted call connection message includes a mobile communication identification number rather than an extension number. In accordance with the request to the call connection to the common exchange (140b) established in their country (S713).

The international common exchange 140b received the call connection request obtains the location information of the mobile terminal 110b-1 of the mobile communication identification number from the home location register 160b or the visitor location register (not shown), and moves the location information. Attempt to connect the call with the terminal (110b-1) (S715).

That is, when the calling terminal 110a-1, which is subscribed to the extension exchange service, attempts to make a call to an external extension terminal 180b-1, which has been forwarded to the call, the calling terminal 110a-1 is a domestic common exchange 140a, a domestic private exchange. A call is established with the called party's mobile terminal 110b-1 via the exchange 150a, the public IP network 100, the foreign private exchange 150a, and the foreign shared exchange 140b.

For example, assume that the intelligent network system 170 receives an IDP message including the originating number of 010-2222-XXXX and the extension number of 0010 from the domestic public exchange 140a in step S703. Then, the intelligent network system 170 designates the private network of the A company as its service network through the subscriber station field 270 and the private network information field 210 of the extension exchange table of FIG. 2. It is recognized that the extension terminal 180a-1 of 0010 is forwarded through the call forwarding activation field 260. The intelligent network system 170 extracts, from the destination mobile number field 240, 084-XXXX-4567, the Japanese identification number of the called party's mobile terminal 110b-1 corresponding to the extension number 0010, from the called mobile number field 240, and the country information field ( Through 250), the receiver's mobile terminal 110b-1 is located in Japan. Subsequently, the intelligent network system 170 publicly accesses the access message including the national information of the called party (Japan), the mobile terminal identification number (084-XXXX-4567), and the domestic private exchange routing information (RN1) corresponding to the extension number. Transfer to the exchange 140a.

Then, the common exchange 130 requests a call connection to the domestic private network exchange 150a of the company A based on the routing information RN1, and the domestic private exchange 150a of the company A is based on the recipient's country information (Japan). Request a call connection to our Japanese private exchange 150b. Then, the Japanese private exchange 150b of the A company requests the public exchange 140b in Japan to call the call to 084-XXXX-4567, which is the called party's mobile terminal identification number, and the Japanese public exchange 140b requests the 084-XXXX-. A call connection is attempted to the mobile terminal 110b-1 of 4567. When the response message is received from the mobile terminal 110b-1, the called party's mobile terminal 110b-1, the Japanese common exchange 140b, the Japanese private exchange 150b of the A company, the public IP network 100, A call path is formed with the originating terminal 110a-1 via A's domestic private exchange 150a and the domestic public exchange 140a.

Therefore, when a caller attempts to call a foreign recipient, the caller may pass through the foreign section through its private exchange 150 and the public IP network 100, and thus may use a cheap international call. That is, a caller generally uses an interstate line having a high communication fee when an international call is attempted. However, when a system according to the present invention is used, the caller uses an international network between a private switch 150 and a public IP network 100, rather than an international line. By using the telephone, you can receive international call service at a lower call rate.

While this specification includes many features, such features should not be construed as limiting the scope of the invention or the claims. Also, the features described in the individual embodiments herein can be implemented in combination in a single embodiment. Conversely, various features described in a single embodiment herein can be implemented individually in various embodiments or in combination as appropriate.

Although the operations are described in a particular order in the drawings, they should not be understood as being performed in a particular order as shown, or in a sequence of successive orders, or all described actions being performed to obtain a desired result. . In certain circumstances, multitasking and parallel processing may be advantageous. In addition, it should be understood that the division of various system components in the above-described embodiments does not require such division in all embodiments. The program components and systems described above may generally be packaged in a single software product or multiple software products.

The method of the present invention as described above may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, serve to further understand the technical spirit of the present invention. It should not be construed as limited to.

1 is a diagram illustrating a configuration of a system for providing an extension exchange service to an originating terminal using an intelligent network system in a mobile communication network according to an embodiment of the present invention.

2 is a diagram illustrating a mapping table for an extension exchange service stored in an intelligent network system according to an embodiment of the present invention.

3 is a flowchart illustrating a method for providing an extension exchange service to a mobile terminal in an intelligent network system according to an embodiment of the present invention.

4 is a flowchart illustrating a method for setting up a call between a mobile station that attempts to connect a call to an extension number in an extension service system according to an embodiment of the present invention and a domestic extension terminal that is inactive for call forwarding.

FIG. 5 is a flowchart illustrating a method for setting up a call between an originating terminal attempting a call to an extension number and a domestic mobile terminal which is switched to a call in an extension exchange service system according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating a method for setting up a call between a mobile terminal that attempts to connect a call to an extension number in an extension exchange service system and an external extension terminal that is not forwarded to a call transfer according to an embodiment of the present invention.

7 is a flowchart illustrating a method for setting up a call between an originating terminal attempting a call to an extension number and a mobile station of a call forwarded station in an extension exchange service system according to an embodiment of the present invention.

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

100: public IP network 120: base station

130: base station controller 140: common exchange

150: private exchange 160: home location register

170: intelligent network system

Claims (8)

A method for providing an extension exchange service in a communication system including a private exchange, a common exchange, and an intelligent network device, (a) receiving, by the common exchange, a call connection request whose called number is an extension number from a calling terminal; (b) requesting, by the common exchange, the extension exchange service of the calling terminal to the intelligent network device; (c) checking, by the intelligent network device, the private exchange routing information based on the identification information of the calling terminal, and transmitting the private exchange routing information to the common exchange; And (d) requesting a call connection to the private exchange using the routing information to establish a call between the extension terminal corresponding to the extension number and the originating terminal by using the routing information. The method of claim 1, Confirming, by the intelligent network device, whether the extension is activated on the extension terminal; When the extension terminal is in the call forwarding state, extracting, by the intelligent network device, the call forwarding terminal identification number of the extension terminal and transmitting the identification number to the common exchange; And And setting the call between the call forwarding terminal and the calling terminal based on the identification number of the call forwarding terminal. The method of claim 2, Confirming, by the intelligent network device, whether the call forwarding terminal is located outside the country; The intelligent network device checks the routing information of the domestic private exchange corresponding to the location information of the call forwarding terminal, the international identification number of the call forwarding terminal and the identification number of the calling terminal when the call forwarding terminal is located in the foreign country. Transmitting to the common exchange; And The public exchange is between the call forwarding terminal and the originating terminal of the foreign identification number via the domestic private exchange in which the routing information is confirmed, a private exchange outside the country corresponding to the location information, and a foreign public network to which the call forwarding terminal is connected. And setting up a call. The method of claim 3, wherein And the domestic private exchange and the foreign private exchange are connected to each other via a public IP network. As a system for providing an extension exchange service to a mobile terminal, An intelligent network device storing and managing private network information for each terminal; And Upon receiving a call connection request from the calling terminal with the extension number, requesting an extension exchange service from the intelligent network device to receive the private exchange routing information of the calling terminal, and using the routing information to call the private exchange. Extension exchange service providing system comprising a; public exchange for establishing a call between the extension terminal and the calling terminal corresponding to the extension number by requesting a connection. The method of claim 5, The intelligent network device checks whether the extension terminal is activated for call forwarding when the extension exchange service is requested, extracts the identification number of the call forwarding terminal when the extension terminal is activated, and transmits the identification number to the common exchange. And the common exchange establishes a call between the call forwarding terminal and the calling terminal based on the identification number of the call forwarding terminal. The method of claim 6, The intelligent network apparatus checks whether the call forwarding terminal is located in a foreign country, and if the call forwarding terminal is located in a foreign country, the domestic private information corresponding to the location information of the call forwarding terminal, an international identification number of the call forwarding terminal, and an identification number of the calling terminal. Check the routing information of the exchange and transmit it to the common exchange, The common exchange exchanges between the forwarding terminal of the foreign identification number and the calling terminal via a domestic private exchange having the routing information checked, a foreign private exchange corresponding to the location information, and a foreign public network to which the call forwarding terminal is connected. Extension exchange service providing system, characterized in that the call setup. The method of claim 7, wherein And the domestic private exchange and the foreign private exchange are connected to each other via a public IP network.

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