JP2007189364A - International roaming system, device to be used therefor, program, and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a communication cost in the international roaming of a mobile communication terminal. <P>SOLUTION: An international roaming system includes a domestic operator device for controlling the connection of the mobile communication terminal having a communication service range in a first country, and an international roaming destination operator device for controlling connection so as to use the mobile communication terminal in a second country. The international roaming destination operator device has a function of allocating a second communication number to the mobile communication terminal, by which calling and receiving are possible in the second country, relating the allocated second communication number to identification information of the mobile communication terminal, and reporting them to the domestic operator device as roaming information via a network. The domestic operator device has a function of connecting communication connecting control relative to the mobile communication terminal to the international roaming destination operator device via a cable line, based on the roaming information reported from the international roaming destination operator device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an international roaming system, and more particularly to an international roaming system used when a portable communication terminal is used overseas.

  In recent years, mobile phones that are used in Japan can be used overseas. This means that the service of a telecommunications carrier that has subscribed to a mobile phone can be received using the facilities of the affiliated foreign operator even if it is outside the scope of the service of the operator, that is, in a foreign country. This is because the various roaming services are provided by various businesses.

  Here, the international roaming method in the conventional example will be described with reference to FIG. Normally, a mobile phone is connected using a mobile phone number (ID) starting with “090” when used in Japan. However, if this mobile phone is taken overseas and roamed, The caller ID is the caller ID plus country code. In other words, even if you are overseas, you need to make an international call once through Japan. Then, communication between the overseas roaming destination operator and the domestic operator is required, which is very expensive.

  In order to solve the above communication cost problem, Patent Document 1 below discloses a technique in which a mobile phone roaming overseas (second country) separately acquires a telephone number in that country. According to this, the telephone number in the home country (first country) can be used, and the telephone number for the second country can be used in the new second country, so that it can be used as a call in the second country. .

JP 2003-18644 A JP 2003-274012 A

  However, even when the above-described conventional technology is used, when a call is made from a home country to a mobile phone located at an international roaming destination, as described above, high communication between the overseas roaming destination operator and the domestic operator is still present. There may be a problem of cost. On the other hand, as shown in Patent Document 2, a technology for connecting an access point in one's home country and an access point in another country with a dedicated communication line is disclosed, but a line with low communication cost is selected as a part of the communication path. In international roaming that requires partnership between operators in their own country and other countries as described above, it cannot be said that effective means for reducing call costs are disclosed, It is difficult to solve the problems described above. Further, as shown in the drawing of Patent Document 2, even when a call is made from the home country to a telephone located in the home country, since the call is sent to the other country, there is a possibility that extra communication costs may be required. There is a problem.

  Therefore, an object of the present invention is to solve the disadvantages in the conventional example described above, and in particular, to reduce the communication cost in the international roaming of the portable communication terminal.

Then, the international roaming system which is one form of this invention is
A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country, and an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country. An international roaming system with
The overseas roaming destination operator device assigns a second communication number that can be made / received in the second country to the portable communication terminal, and roams by associating the assigned second communication number with identification information of the portable communication terminal. In addition to providing a function for notifying domestic operator devices as information via a network,
Based on the roaming information notified from the overseas roaming destination operator device, the domestic operator device has a function of performing communication connection control for the portable communication terminal by connecting to the overseas roaming destination operator device via a wired line.
It is characterized by that.

Furthermore, specifically,
A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country, and an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country. An international roaming system with
The overseas roaming destination operator device assigns a second communication number that can be sent and received in the second country to the portable communication terminal, and the assigned second communication number and the portable communication terminal. Roaming information storage means for associating and storing identification information as roaming information, and roaming information notification means for notifying the domestic operator device of roaming information via a network,
The domestic operator device comprises notification roaming information storage means for storing the notified roaming information, and connection control means for performing communication connection control for the portable communication terminal based on the roaming information,
The connection control means connects to the overseas roaming destination operator device via a wired line and performs communication connection with the portable communication terminal.
It is characterized by that.

  Then, the connection control means included in the domestic operator device reads the second communication number assigned to the portable communication terminal from the notification roaming information storage means when receiving a call request to the portable communication terminal, and reads the second communication It is characterized by making a call to a number. Further, the identification information of the portable communication terminal associated with the second communication number as roaming information is a communication number in the first country of the portable communication terminal.

  According to the above invention, first, the second communication number is assigned to the portable communication terminal in the second country, and this is notified and registered to the domestic operator device in the first country. Then, when the portable communication terminal is used thereafter, domestic communication is performed in the overseas roaming destination operator device using the newly assigned second communication number in the second country. In addition, when there is a call request from another communication device located in the first country, the domestic operator device reads the second communication number of the portable communication terminal that is the call destination and makes a call to the number. At this time, the overseas roaming destination operator apparatus is connected via a wired line.

  As described above, since the communication connection between the domestic operator device and the overseas roaming destination operator device is performed using a wired line with no or low communication cost, the overall communication cost at the time of international roaming is reduced. be able to. In the second country, since the communication connection in the second country is performed using the second communication number, the communication cost can be reduced. In addition, the identification process of a portable communication terminal becomes easy by associating the 2nd communication number allocated and the communication number in a 1st country.

  Further, the second communication number assigning means possessed by the overseas roaming destination operator device operates when it receives a location registration request from a portable communication terminal in the second country. Accordingly, since the second communication number is assigned at the same time as the use of the portable communication terminal is started in the second country, the above-described service can be used quickly, and the convenience of the user can be improved.

  The first domestic domestic wired operator device and the second domestic foreign wired operator device connected by a wired line are provided, and the domestic operator device connection control means includes the domestic wired operator device and the overseas wired operator device. Communication connection control is performed via a wired line to be connected. As a result, even a communication company that does not have a wired line can provide the above-described service by using the wired line of another provider.

In addition, the domestic operator device which is another embodiment of the present invention,
A domestic operator device that controls connection of a portable communication terminal having a communication service range in the first country,
The second communication number assigned to the portable communication terminal at the overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country, and the second communication number that can be made / received in the second country Roaming information receiving means for receiving roaming information associated with identification information of a portable communication terminal from an overseas roaming destination operator device, notification roaming information storage means for storing the received roaming information, and portable type based on roaming information Connection control means for performing communication connection control to the communication terminal,
The connection control means connects to the overseas roaming destination operator device via a wired line and performs communication connection with the portable communication terminal.
It is characterized by that.

Moreover, the program which is the other form of this invention is:
In a domestic operator device that controls connection of a portable communication terminal having a communication service range in the first country,
The second communication number assigned to the portable communication terminal at the overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country, and the second communication number that can be made / received in the second country Roaming information receiving means for receiving roaming information associated with identification information of a portable communication terminal from an overseas roaming destination operator device and storing the received roaming information, and an overseas roaming destination via a wired line based on the roaming information Connection control means for connecting to an operator device and performing communication connection control for a portable communication terminal;
It is characterized by realizing.

Furthermore, the international roaming method according to another embodiment of the present invention is as follows.
A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country, and an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country. A method for international roaming of a portable communication terminal using each device,
The overseas roaming destination operator device assigns a second communication number that can be made / received in the second country to the portable communication terminal, and roams by associating the assigned second communication number with identification information of the portable communication terminal. Information is sent to the domestic operator device via the network as information,
Based on the roaming information notified from the overseas roaming destination operator device, the domestic operator device performs communication connection control for the portable communication terminal by connecting to the overseas roaming destination operator device via a wired line.
It is characterized by that.

More specifically,
A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country, and an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country. A method for international roaming of a portable communication terminal using each device,
The overseas roaming destination operator device assigns a second communication number that can be sent and received in the second country to the portable communication terminal, and the assigned second communication number and the portable communication terminal Roaming information notification step of associating identification information and storing it as roaming information and notifying roaming information to a domestic operator device via a network,
A domestic operator device stores the notified roaming information, and connects to an overseas roaming destination operator device via a wired line based on the roaming information, and performs a connection control process for controlling communication connection to the portable communication terminal. Have
It is characterized by that.

  Then, the connection control step by the domestic operator device reads the second communication number assigned to the portable communication terminal from the roaming information when receiving a call request for the portable communication terminal, and sends the call to the second communication number. It is characterized by that.

  Even the apparatus, program, and method having the above-described configuration operate in the same manner as the above-described international roaming system, and thus the above-described object of the present invention can be achieved.

  Since the present invention is configured and functions as described above, according to this, the communication connection between the domestic operator device and the overseas roaming destination operator device is performed using a wired line with a low or low communication cost. The overall communication cost during international roaming can be reduced, and in the second country, the communication connection in the second country is performed using the second communication number, so that the communication cost is also reduced. It has an unprecedented excellent effect of being able to.

  In the portable communication terminal, when used in an overseas roaming area (second country), the mobile communication terminal makes a call to the portable communication terminal from the first country, which is a normal communication service area, and the second It is characterized by a mechanism for reducing call costs when making calls in Japan.

  Hereinafter, in the embodiment, a mobile phone will be described as an example of a portable communication terminal, and the first country will be described as Japan and the second country as a foreign country. However, the portable communication terminal is not limited to the mobile phone, and the first country is not limited to Japan.

  A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the overall configuration of the international roaming system, and FIGS. 2 to 3 are functional block diagrams showing the configuration of each device. 4 to 6 are explanatory diagrams showing the operation of the international roaming system.

[Constitution]
As shown in FIG. 1, the international roaming system according to the present embodiment includes a domestic operator device 1 that controls connection of a mobile phone 5 having a communication service range RA in Japan A, which is the first country, and the mobile phone 5 described above. And an overseas roaming destination operator device 2 that performs connection control so that it can be used in a foreign country B (overseas) that is two countries. Also, a domestic wired operator device 3 in Japan A connected to the domestic operator device 1 and a foreign wired operator device 4 in foreign country B connected to the overseas roaming destination operator device 2 are provided. Are connected by a wired line 10. Hereinafter, each device will be described in detail.

  First, as described above, the mobile phone 5 is a mobile phone 5 that is normally capable of making calls within the call service area of a carrier in Japan A, and in particular, the call area RA of the domestic operator device 1 shown in FIG. You can receive service at Further, this mobile phone has a function capable of international roaming so that a call service can be received in the foreign country B using the facilities of the foreign B carrier. In particular, in the foreign country B, a call can be made in the call area RB by the overseas roaming destination operator device 2 shown in FIG.

  The overseas roaming destination operator device 2 is a server computer managed by a foreign B mobile phone operator company that can accept roaming as described above. The configuration of this overseas roaming destination operator device 2 is shown in FIG. As shown in this figure, the overseas roaming destination operator device 2 includes a location registration acceptance processing unit 21 that accepts a location registration request from the mobile phone 5 in the foreign country B by incorporating a predetermined program in an arithmetic device such as a CPU. , A domestic number assignment processing unit 22 (second communication number assigning means) for assigning a second communication number that can be made / received in a foreign country B to a mobile phone, and the second communication number and mobile phone identification information (ID) Roaming information notification processing unit 23 (roaming information notification means) for notifying the domestic operator device 23 via the network of roaming information associated with and a call connection processing unit for performing call connection control for the mobile phone 5 in the foreign country B 24 is constructed. In addition, a storage device such as a hard disk is provided with a roaming information storage unit 25 (roaming information storage unit) that stores the assigned second communication number and the identification information (ID) of the mobile phone 5 as roaming information in association with each other. ing. Hereinafter, a configuration characteristic of the present invention will be described in detail.

  First, the domestic number assignment processing unit 22 receives a location registration request from the mobile phone 5 in the location registration reception processing unit 21 and operates when notified to that effect. 2 communication numbers are assigned. In other words, this second communication number is different from the phone number in Japan A of the mobile phone 5, and when calling from another telephone terminal in the foreign B, the second communication number is sent as a domestic phone in the foreign B can do. Further, the domestic number assignment processing unit 22 associates the assigned second communication number with the identification information (ID) of the mobile phone 5 and stores them in the roaming information storage unit 25 as roaming information. The identification information (ID) of the mobile phone 5 is, for example, a telephone number (communication number) in Japan A assigned in advance to the mobile phone 5. The second communication number and the like are passed to the roaming information notification processing unit 23.

  The roaming information notification processing unit 23 indicates that the mobile phone 5 is receiving the roaming service in the foreign country B and the roaming information in which the second communication number and the identification information (ID) are associated with each other in Japan A The operator apparatus 1 is notified via the Internet network or the like.

  Further, when a call is made to the mobile phone 5 using the above-described second communication number in the foreign country B, the call connection processing unit 24 calls the mobile phone 5 with the number and performs a call connection. Further, when a call is made from another telephone terminal in Japan A to the mobile phone 5, as described later, a call, that is, a call connection request is received via the overseas wired operator device 4 to establish a call connection. Control as follows.

  Next, the configuration of the domestic operator device 1 will be described with reference to FIG. As described above, the domestic operator device 1 is a server computer managed by an operator in Japan to which the mobile phone 5 is subscribed and registered in Japan A. The operator company in Japan has a mutual roaming contract with the overseas roaming destination operator described above.

  As shown in FIG. 2, the domestic operator device 1 has a predetermined program incorporated in an arithmetic device such as a CPU so that the mobile phone 5 notified from the overseas roaming destination operator device 2 is roaming. And a roaming registration processing unit 11 (roaming information receiving means) for receiving the roaming information, a call reception processing unit 12 for receiving a call request from another telephone terminal 6 in the country A to the mobile phone 5, and making a call in the country A A call processing unit 13 (connection control means) for controlling connection between the other telephone terminal 6 and the mobile phone 5 is constructed. A storage device such as a hard disk is provided with a roaming information storage unit 14 (notification roaming information storage means) that stores the roaming information described above. Details will be described below.

  The roaming registration processing unit 11 receives the roaming notice notified from the overseas roaming destination operator device 2 and the roaming information described above, and registers the information in the roaming information storage unit 14. That is, the roaming information storage unit 14 stores the fact that the mobile phone 5 is roaming in the foreign country B, and the phone number (ID) in the domestic country A of the mobile phone 5 and the telephone number (first number in the foreign country B). 2 call numbers) are stored in association with each other.

  The call reception processing unit 12 receives a call request to the mobile phone 5 with a telephone number in Japan A from a telephone terminal 6 such as a landline phone or a mobile phone in Japan A, and notifies the call processing unit 13 of the call request. .

  When the call processing unit 13 receives a call request to the mobile phone 5, the call processing unit 13 refers to the information in the roaming information storage unit 14 to determine whether the mobile phone 5 is roaming or not. In some cases, the telephone number (second communication number) in foreign country B receiving roaming is checked based on the telephone number in Japan A. Then, using the second communication number, call and call connection control is performed via the domestic wired operator device 3. That is, the call and call connection from the domestic A is performed by connecting to the overseas roaming destination operator device via the wired line 10 via the domestic wired operator device 3 and the overseas wired operator device 4.

  The domestic wired operator device 3 is a server computer managed by a wired operator company that is a wired operator in Japan A and has an interconnection contract for an international call request from a domestic operator. The overseas wired operator device 4 is a server computer managed by a wired operator company that belongs to the same country as the overseas roaming destination operator and has an interconnection contract for international calls with domestic wired operators.

[Operation]
Next, the operation of the international roaming system described above will be described with reference to FIGS. FIG. 4 is an explanatory diagram showing an operation during an international call. FIG. 5 is a sequence diagram showing the operation of the entire system, and FIG. 6 is a flowchart showing the operation of the domestic operator device. In the following, description will be made mainly with reference to FIG.

  First, the mobile phone 5 located in the foreign country B performs location registration for roaming with the overseas roaming destination operator device 2 (step S1). Subsequently, the overseas roaming destination operator device 4 that has received the request authenticates whether the mobile phone 5 is a terminal having an invalid ID number, and then returns a location registration acceptance (step S2), and at the same time roaming destination The second communication number to be a telephone number in foreign country B is assigned (step S3, second communication number assignment step).

  Thereafter, it notifies the domestic operator device 1 of the domestic operator (subscriber operator) in Japan A who is subscribed to the mobile phone 5 that has requested location registration that the roaming has been accepted. At this time, the second communication number which is the domestic number of the roaming destination assigned by the overseas roaming destination operator is also notified together with the ID number (step S4, roaming information notifying step). The notified second communication number is stored in the overseas roaming destination operator device 2 together with identification information (ID) which is a telephone number of the mobile phone 5 in Japan A. Then, the domestic operator device 1 receives and stores the notified information (step S5). In particular, identification information (ID) that is a telephone number in Japan A of the mobile phone 5 and a second communication number that is a domestic number in a foreign country B are stored in association with each other (steps S21 and S22 in FIG. 6).

  Thereafter, when a call is made from another telephone terminal 6 in Japan A to the mobile phone 5 in foreign country B (step S11), the domestic operator apparatus 1 accepts the call request (in step S23 in FIG. 6). Affirmative determination) Referring to the telephone number in Japan A of the mobile phone 5 received from the telephone terminal 6, the second communication number which is the domestic number of the roaming destination notified from the stored overseas roaming destination operator device 2 (Step S12, step S24 in FIG. 6).

  Then, the domestic operator device 1 makes an international call to the overseas wired operator device 4 via the domestic wired operator device 3 using the second communication number (step S13, step S25 in FIG. 6, step S25 in FIG. 4). (See arrows Y1 and Y2), the telephone terminal 6 in Japan A and the mobile phone 5 in foreign country B are connected via the overseas roaming destination operator device 2 (step S14, step S26 in FIG. 6, arrow in FIG. 4). Y3 and Y4 reference, connection control step).

  In this way, mobile phone charges in each country are mainly charged in Japan A and foreign B, which is the roaming destination, and communication costs between Japan A and Foreign B are free or By using the inexpensive wired line 10, the communication cost can be reduced as compared with the case where the overseas roaming destination operator device 2 and the domestic operator device 1 are directly connected. In addition, a call in the foreign country B only costs a normal domestic mobile phone call using the second communication number. Therefore, it is possible to reduce the total communication cost when roaming overseas.

  In the above description, the domestic operator device 1 and the overseas roaming destination operator device 2 have been described as being configured by a single server computer. However, a plurality of computers are used together with other computers that perform location registration and the like. It may be configured.

  INDUSTRIAL APPLICABILITY The present invention can be used in an international roaming system for mobile phones that can reduce call costs, and has industrial applicability.

It is a block diagram which shows the whole structure of the international roaming system in Example 1. FIG. It is a functional block diagram which shows the structure of the domestic operator apparatus disclosed in FIG. It is a functional block diagram which shows the structure of the overseas roaming destination operator apparatus disclosed in FIG. It is explanatory drawing which shows the operation | movement at the time of the international call in the international roaming system disclosed in FIG. It is a sequence diagram which shows operation | movement of the whole international roaming system disclosed in FIG. It is a flowchart which shows operation | movement of the domestic operator apparatus disclosed in FIG. It is explanatory drawing which shows the international roaming system in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Domestic operator apparatus 2 Overseas roaming destination operator apparatus 3 Domestic wired operator apparatus 4 Overseas wired operator apparatus 5 Cellular phone 6, 7 Telephone terminal 10 Wired line 11 Roaming registration process part 12 Call reception process part 13 Call process part 14 Roaming information Storage unit 21 Location registration reception processing unit 22 Domestic number assignment processing unit 23 Roaming information notification processing unit 24 Call connection processing unit 25 Roaming information storage unit

Claims (12)

A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country; an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country; An international roaming system with
The overseas roaming destination operator device assigns a second communication number that can be made / received in the second country to the portable communication terminal, and the assigned second communication number and identification information of the portable communication terminal; And a function to notify the domestic operator device via the network as roaming information
Based on the roaming information notified from the overseas roaming destination operator device, the domestic operator device performs communication connection control for the portable communication terminal by connecting to the overseas roaming destination operator device via a wired line. Has function,
International roaming system characterized by that. A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country; an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country; An international roaming system with
The overseas roaming destination operator device assigns a second communication number assignable to the portable communication terminal to a second communication number that can be made / received in the second country, and the assigned second communication number and the portable Roaming information storage means for associating and storing the identification information of the communication terminal as roaming information, and roaming information notification means for notifying the roaming information to the domestic operator device via a network,
The domestic operator device includes a notification roaming information storage unit that stores the notified roaming information, and a connection control unit that performs communication connection control for the portable communication terminal based on the roaming information,
The connection control means connects to the overseas roaming destination operator device via a wired line and performs communication connection with the portable communication terminal.
International roaming system characterized by that.   The connection control means included in the domestic operator device reads out the second communication number assigned to the portable communication terminal from the notification roaming information storage means when receiving a call request to the portable communication terminal. 3. The international roaming system according to claim 2, wherein a call is made to two communication numbers.   4. The international roaming system according to claim 3, wherein the identification information of the portable communication terminal associated with the second communication number as the roaming information is a communication number in the first country of the portable communication terminal. . The second communication number assigning means of the overseas roaming destination operator device operates when receiving a location registration request from the portable communication terminal in the second country;
The international roaming system according to claim 2, 3 or 4. A first domestic domestic wired operator device and a second domestic foreign wired operator device connected by the wired line;
The connection control means of the domestic operator device performs communication connection control via the wired line connecting the domestic wired operator device and the overseas wired operator device.
The international roaming system according to claim 2, 3, 4 or 5. A domestic operator device that controls connection of a portable communication terminal having a communication service range in the first country,
Second communication that can be made / received in the second country assigned to the portable communication terminal by an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country Roaming information receiving means for receiving roaming information in which the number and identification information of the portable communication terminal are associated from the overseas roaming destination operator device, notification roaming information storage means for storing the received roaming information, and the roaming information Connection control means for performing communication connection control for the portable communication terminal based on
The connection control means connects to the overseas roaming destination operator device via a wired line and performs communication connection with the portable communication terminal.
Domestic operator equipment characterized by that.   The connection control unit reads the second communication number assigned to the portable communication terminal from the notification roaming information storage unit when receiving a call request to the portable communication terminal, and transmits the second communication number to the second communication number. The domestic operator device according to claim 7, wherein: In a domestic operator device that controls connection of a portable communication terminal having a communication service range in the first country,
Second communication that can be made / received in the second country assigned to the portable communication terminal by an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country Roaming information receiving means for receiving roaming information in which the number and identification information of the portable communication terminal are associated from the overseas roaming destination operator device and storing the received roaming information; and a wired line based on the roaming information A connection control means for connecting to the overseas roaming destination operator device through the communication connection control for the portable communication terminal,
Program to realize. A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country; an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country; A method of performing international roaming of the portable communication terminal using each of the devices,
The overseas roaming destination operator device assigns a second communication number that can be made / received in the second country to the portable communication terminal, and the assigned second communication number and identification information of the portable communication terminal; And informing the domestic operator device via the network as roaming information
Based on the roaming information notified from the overseas roaming destination operator device, the domestic operator device performs communication connection control for the portable communication terminal by connecting to the overseas roaming destination operator device via a wired line. ,
International roaming method characterized by that. A domestic operator device that performs connection control of a portable communication terminal having a communication service range in the first country; an overseas roaming destination operator device that performs connection control so that the portable communication terminal can be used in the second country; A method of performing international roaming of the portable communication terminal using each of the devices,
The overseas roaming destination operator device assigns a second communication number that can be sent and received in the second country to the portable communication terminal, and the assigned second communication number and the portable Roaming information notification step of associating the identification information of the type communication terminal and storing it as roaming information and notifying the roaming information to the domestic operator device via a network,
Connection control in which the domestic operator device stores the notified roaming information, and connects to the overseas roaming destination operator device via a wired line based on the roaming information and performs communication connection control to the portable communication terminal And having a process
International roaming method characterized by that. In the connection control step by the domestic operator device, the second communication number assigned to the portable communication terminal is read out from the roaming information when a call request for the portable communication terminal is received, and the second communication number is read. The international roaming method according to claim 11, wherein a call is made to.

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