JP5492422B2 - Call control system, extension telephone connection method, and program - Google Patents

Description

  The present invention relates to a technique for using a general mobile phone for making a call via a mobile phone network as an extension phone.

  A service that enables a mobile phone to be used as an extension telephone is provided by each mobile phone carrier.

  As a technique for using a mobile phone as an extension telephone, for example, a technique for constructing a wireless IP telephone network in a mobile telephone network and performing an extension call using the mobile telephone in the wireless IP telephone network, In addition, there is a technology for implementing an extension call by installing a small wireless base station and an exchange. In addition, there is a technology that enables extension calls using a mobile phone without installing an exchange or the like on the premises by providing a conversion function between a mobile phone number and an extension number in a public mobile phone network. In addition, there exists a technique described in patent document 1 as a prior art relevant to this application.

JP-A-8-172673

  However, since there is a difference in service provision methods among mobile phone operators, it is not possible to make an extension call between a mobile phone of one mobile phone operator and a mobile phone of another mobile phone operator. Even if each mobile phone carrier adopts a method of providing a conversion function between a mobile phone number and an extension number in the mobile phone network, the conversion function is closed in each mobile phone network, so a different mobile phone It is not possible to make an extension call between mobile phones of business operators.

  Because of this problem, for example, when a department X uses the extension service of the mobile phone operator A company and another department Y uses the extension service of the mobile phone operator B company, An extension call using a mobile phone could not be performed between X and department Y, and convenience was low.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a technique that enables a mobile phone to be used as an extension telephone without depending on a contracted mobile phone operator. .

In order to solve the above problems, the present invention provides a plurality of first telephone networks, which are a telephone network of a plurality of carriers, and a second telephone network via a plurality of gateway devices corresponding to the respective carriers. A call control system provided in the second telephone network in the interconnected telephone network, wherein the first telephone is connected to the telephone terminal connected to the first telephone network and used as an extension telephone. A telephone number and extension number for the second telephone network are assigned in addition to a telephone number for the network, and the call control system is assigned to a telephone terminal connected to the first telephone network An inter-network telephone number storage means for storing the telephone number for the first telephone network and the telephone number for the second telephone network in association with each other; the telephone number and the extension number for the second telephone network; And an extension number storage means for storing the information in association with each other, When a call connection signal originating from the telephone network and having an extension number as a called number is received via a gateway device corresponding to the first telephone network, by referring to the extension number storage means, By referring to the extension number converting means for converting the extension number in the call connection signal into a telephone number for the second telephone network corresponding to the extension number, the extension number by referring to the inter-network telephone number storage means Network number conversion means for converting the telephone number for the second telephone network in the call connection signal whose callee number has been converted by the conversion means into the telephone number for the first telephone network corresponding to the telephone number; , Identifying the gateway device of the operator corresponding to the called number included in the call connection signal whose called number has been converted by the inter-network number converting means, and sending the call connecting signal to the gateway device Transfer means for transferring a call control system comprising: a, the identification information of the telephone terminals connected to said second telephone network, the telephone number for the second telephone network of the telephone terminal And the second telephone network in the call connection signal in which the called number is converted by the extension number converting means with reference to the identification information of the telephone terminal stored in the storage means. The telephone connection number is the telephone number of the telephone terminal connected to the second telephone network, the call connection signal is transferred to the telephone terminal, and the telephone number for the second telephone network is the first telephone number. And a means for transferring the call connection signal to the inter-network number conversion means when the telephone number is not the telephone number of the telephone terminal connected to the second telephone network .

  The first telephone network is, for example, a mobile telephone network, and the second telephone network is, for example, an IP telephone network.

  According to the present invention, by applying a mobile phone network as the first telephone network, a technique for using a mobile phone as an extension telephone can be realized without depending on a contracted mobile phone operator.

1 is a configuration diagram of a telephone network according to an embodiment of the present invention. 3 is a functional configuration diagram of an inter-network number conversion device 5. FIG. It is a figure which shows the example of the table information stored in the number information storage part. It is a figure which shows the example of the table information stored in the routing information storage part. 3 is a functional configuration diagram of a call control device 6. FIG. It is a figure which shows the example of the table information stored in the extension number information storage part. It is a figure which shows the example of the table information stored in the extension number information storage part. It is a figure which shows the example of the table information stored in the routing information storage part. It is a sequence chart which shows the operation example of the system which concerns on embodiment of this invention. It is a sequence chart which shows the operation example of the system which concerns on embodiment of this invention. It is a sequence chart which shows the operation example of the system which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. Hereinafter, a cellular phone network and an IP telephone network will be described as examples of the first telephone network and the second telephone network that are interconnected. The present invention is a telephone network in which the cellular phone network and the IP telephone network are interconnected. It is applicable not only to.

(System configuration)
FIG. 1 shows a configuration diagram of a telephone network according to an embodiment of the present invention. As shown in FIG. 1, in the telephone network according to the present embodiment, the cellular phone network 1 and the IP telephone network 2 of each cellular phone carrier are connected via a gateway device 3 (denoted as GW in the figure). Take the configuration. As shown in FIG. 1, the gateway device 3 is provided corresponding to each mobile phone carrier.

  Each mobile telephone network 1 includes an exchange device 4, and the IP telephone network 2 includes an inter-network number conversion device 5 and a call control device 6.

  In the telephone network according to the present embodiment, an IP telephone number (referred to as “050” in the present embodiment) is assigned to an IP telephone terminal connected to the IP telephone network 2 and connected to each mobile telephone network 1. A mobile phone number (in this embodiment, 090 number) is assigned to the mobile phone. In this embodiment, an IP telephone number (050 number) is assigned to a mobile phone that is also used as an extension telephone as a number used inside the network. Furthermore, extension numbers are assigned to IP telephone terminals and mobile phones that are also used as extension telephones.

  In the following description, each terminal, a telephone number corresponding to the terminal, and the like are identified by an English letter at the end. For example, the 090 number, 050 number, and extension number of the cellular phone A are written as 090-A, 050-A, and extension number A, respectively.

  In addition to the normal routing function, the switching device 4 of each mobile phone network 1 functions to transfer the call connection signal to the gateway device 3 when receiving a call connection signal in which the called number is designated by an extension number. Have A special number may be added to the extension number when making a call, and transfer to the gateway device 3 may be performed based on the special number. The call connection signal is a signal for establishing a voice communication path.

  The gateway device 3 has a function of mutually converting a call control signal such as a call connection signal for the mobile phone network 1 and a call control signal for the IP phone network 2, and voices flowing through the mobile phone network 1 and the IP phone network 2. And a function of mutually converting voice packets flowing in. Although not specifically described below, it is assumed that the gateway device 3 performs conversion of a call control signal (call connection signal or the like) and audio media. The call control signal conversion function and the voice media conversion function may be physically separated.

  The inter-network number conversion device 5 converts an IP telephone number (050 number) included as a called number in a call connection signal into a mobile phone number (090 number), or converts a mobile phone number (090 number) included as a calling number into an IP telephone. This is a device having a function of converting to a number (050 number) and a routing function of transferring the call connection signal subjected to the number conversion to an appropriate transfer destination. The inter-network number conversion device 5 is called an inter-network number conversion device because it performs number conversion between the telephone number in the IP telephone network 2 and the telephone number in the mobile telephone network 1. In addition, it is good also as providing the function of the network number conversion apparatus 5 in the gateway apparatus 3 instead of providing the network number conversion apparatus 5 as an independent apparatus.

  The call control device 6 is a device for performing call connection control in the IP telephone network 2, and in addition to a general routing function for transferring a call connection signal to an IP telephone terminal or other call control device based on the called number. In addition, a correspondence table that associates 050 numbers with extension numbers is provided, and has a function of transferring a call connection signal based on the extension number.

  In the present embodiment, call connection control in the IP telephone network 2 is performed based on SIP, and both the inter-network number conversion device 5 and the call control device 6 are SIP servers that transmit and receive call control signals based on SIP. It has a function.

  FIG. 2 shows a functional configuration diagram of the inter-network number conversion device 5. As shown in FIG. 2, the inter-network number conversion device 5 includes a signal transmission / reception unit 51, an inter-network number conversion unit 52, a routing function unit 53, a number information storage unit 54, and a routing information storage unit 55.

  The signal transmission / reception unit 51 is a functional unit for transmitting / receiving a call control signal such as a call connection signal via the IP telephone network 2. The inter-network number conversion unit 52 refers to the number information storage unit 54, converts the calling number in the call connection signal to 090 number, converts it to the corresponding 050 number, and the called number is 050 number. In some cases, it has a function of converting it into a corresponding 090 number. The routing function unit 53 has a function of transferring a call control signal such as a call connection signal to an appropriate transfer destination by referring to the routing information storage unit 55.

  FIG. 3 shows an example of table information stored in the number information storage unit 54. As shown in FIG. 3, the number information storage unit 54 stores mobile phone numbers and IP phone numbers in association with each other. FIG. 4 shows an example of table information stored in the routing information storage unit 55. As shown in FIG. 4, the routing information storage unit 55 stores the called number and the transfer destination (IP address or the like) to which the call control signal is transferred in correspondence with the called number. In FIG. 4, for example, if the called number in the call connection signal is an extension number, the call connection signal is transferred to the call control device 6, and the called number is a number included in a predetermined number band of 090. It is shown that the data is transferred to the gateway device of the corresponding provider. For example, an extension number is a number to which numbers other than 050, 090, etc. are assigned as numbers at the beginning of the extension number, so that it can be easily identified as an extension number.

  FIG. 5 shows a functional configuration diagram of the call control device 6. As shown in FIG. 5, the call control device 6 includes a signal transmission / reception unit 61, an extension number conversion unit 62, a routing function unit 63, an extension number information storage unit 64, and a routing information storage unit 65.

  Of course, the call control device 6 includes a function related to a prior art (not shown) for performing call control and call management in the IP telephone network 2. FIG. 5 mainly shows the parts related to the embodiment of the present invention. Further, it goes without saying that each mobile phone network 1, IP phone network 2, gateway device 3 and the like include functions related to the prior art not shown in order to realize the functions.

  The signal transmission / reception unit 61 is a functional unit for transmitting / receiving a call control signal such as a call connection signal via the IP telephone network 2. The extension number conversion unit 62 refers to the extension number information storage unit 54 to convert the call number into a corresponding 050 number when the called number in the call connection signal is an extension number, and the call connection signal When the calling number is 050, the telephone number is converted into a corresponding extension number. The routing function unit 63 has a function of transferring a call control signal such as a call connection signal to an appropriate transfer destination by referring to the routing information storage unit 65.

  FIG. 6 shows an example of table information stored in the extension number information storage unit 64. As shown in FIG. 6, the extension number information storage unit 64 stores an IP telephone number and an extension telephone number in association with each other.

  As shown in FIG. 7A, the table information stored in the extension number information storage unit 64 may be provided for each group forming the extension system. In this case, as shown in FIG. 7B, a correspondence table between 050 numbers allocated to terminals (including IP telephone terminals and mobile phones) included in the extension system and group identification information is an extension number information storage unit. 64. The extension number conversion unit 62 identifies a group corresponding to the 050 number (called number or calling number) included in the call connection signal by referring to the correspondence table shown in FIG. 7B, and corresponds to the group. The table information shown in FIG. 7 (a) is used. In this way, even if there is an extension number that overlaps between groups, it can be identified.

  FIG. 8 shows an example of table information stored in the routing information storage unit 65. As shown in FIG. 8, in the routing information storage unit 55, a called number and a transfer destination (IP address or the like) to which a call control signal is transferred corresponding to the called number are stored in association with each other. The example of FIG. 8 shows that a call connection signal having another 050 number that cannot be specified as the destination telephone terminal is transferred to the inter-network number conversion device 5.

  In the present embodiment, the inter-network number conversion device 5 and the call control device 6 are separate devices, but the inter-network number conversion unit 52 and the routing function of the inter-network number conversion device 5 are included in the call control device 6. The call control device 6 including the function corresponding to the unit 53 may be realized as a call control system.

  In this case, when the call control system receives a call connection signal having an extension number as a called number, the call control system refers to the extension number storage unit 64 to correspond the extension number in the call connection signal to the extension number. Network number conversion for converting an IP telephone number in the call connection signal into a mobile telephone number corresponding to the IP telephone number by referring to an extension number converting means for converting the telephone number into an IP telephone number And a transfer means for transferring the call connection signal with the called number converted to the gateway device 3.

  This apparatus can be realized by causing a computer to execute a program having a function corresponding to the call control system. The program may be installed in a computer from a recording medium such as a memory, or may be downloaded from a server on the Internet and installed.

  The network number conversion device 5 and the call control device 6 having the configuration according to the present embodiment can also be realized by causing a computer to execute a program having a function corresponding to the device. The program may be installed in a computer from a recording medium such as a memory, or may be downloaded from a server on the Internet and installed.

(System operation)
Next, operation examples of the system according to the embodiment of the present invention will be described with reference to the sequence charts of FIGS. In the example described below, the table information shown in FIGS. 3, 4, 6, and 8 is used.

  By using the technology according to the present embodiment, not only an extension call between mobile phones but also an extension call between a mobile phone and an IP phone terminal can be performed. Therefore, in the following, the operation will be described for three cases: connection from a mobile phone to an IP phone terminal, connection from an IP phone terminal to a mobile phone, and connection from a mobile phone to another mobile phone.

<Operation when connecting from mobile phone A to IP phone terminal Z>
First, the operation when the mobile phone A is connected to the IP phone terminal Z will be described with reference to FIG.

  When the extension number Z is dialed as the called number in the mobile phone A having the number 090-A, a call connection signal including 090-A as the calling number and the extension number Z as the called number is issued from the mobile phone A. (Step 1).

  The call connection signal is transferred within the cellular phone network 1 and reaches the gateway device 3. The gateway device 3 transfers the call connection signal to the inter-network number conversion device 5 (step 2).

  In the inter-network number conversion device 5 that has received the call connection signal, the inter-network number conversion unit 52 refers to the number information storage unit 54 (FIG. 3) to change the calling number in the call connection signal from 090-A to 050-A. (Step 3). Then, the routing function unit 53 refers to the routing information storage unit 55 (FIG. 4) to transfer a call connection signal having the extension number Z as the called number to the call control device 6 (step 4).

  In the call control device 6 that has received the call connection signal, the extension number conversion unit 62 converts the called number of the call connection signal from the extension number Z to 050-Z by referring to the extension number information storage unit 64 (FIG. 6). At the same time, the calling number is converted from 050-A to extension number A (step 5).

  Then, the routing function unit 63 refers to the routing information storage unit 65 (FIG. 8) to transfer the call connection signal to the IP telephone terminal Z which is the transfer destination corresponding to the called number 050-Z (step 6). ). In the IP telephone terminal Z that has received the call connection signal, the bell rings and the user is called, and a response is returned when the user goes off-hook (step 7). As a result, a call path is formed, and a voice call is made between the mobile phone A and the IP telephone terminal Z via the call path (step 8). In step 5, the extension number Z may be added in addition to 050-Z as the call connection signal destination number. As a result, the extension number Z is transmitted to the IP telephone terminal Z in step 6 so that the IP telephone terminal Z can identify that it is an incoming call and generates a ringing sound different from the ringing sound in the case of an external line incoming call. be able to.

  The connection method is not limited to the above method. Any connection method may be used as long as a call path for establishing a voice call between the mobile phone A and the IP telephone terminal Z is finally established by the call connection signal. The same applies to other operation examples.

<Operation when connecting from IP phone terminal Z to mobile phone A>
Next, the operation of the system when connecting from the IP telephone terminal Z to the mobile phone A will be described with reference to FIG.

  When the extension number A is dialed as the called number at the IP telephone terminal Z having the telephone number 050-Z, a call connection signal including the calling number 050-Z and the extension number A is transmitted to the IP telephone terminal Z. (Step 11). The call connection signal is sent to the call control device 6.

  In the call control device 6 that has received the call connection signal, the extension number conversion unit 62 refers to the extension number information storage unit 64 (FIG. 6) and converts the called number in the call connection signal from the extension number A to 050-A. At the same time, the calling number 050-Z is converted into the corresponding extension number Z (step 12).

Next, the routing function unit 63 refers to the routing information storage unit 65 (FIG. 8) to determine that the transfer destination of the call connection signal whose called number is 050-A is the inter-network number conversion device 5. Then, the call connection signal is transferred to the network number converter 5 (step 13).
In the inter-network number conversion device 5 that has received the call connection signal, the inter-network number conversion unit 52 refers to the number information storage unit 54 (FIG. 3), so that the called number in the call connection signal is changed from 050-A. The mobile phone number is converted to 090-A (step 14).

  Then, the routing function unit 53 in the inter-network number conversion device 5 refers to the routing information storage unit 55 (FIG. 4), and transfers the call connection signal to the gateway device 3 corresponding to the mobile phone operator of 090-A. (Step 15). The gateway device 3 issues the call connection signal to the mobile phone network 1, and the mobile phone network 1 receives the call connection signal via the switching device 4 to the mobile phone A (step 16), and the mobile phone A rings. A user call is made. Then, when the user off-hooks the mobile phone A, a response is returned (step 17), and a call between the mobile phone A and the IP phone terminal Z is started (step 18).

<Operation when mobile phone A connects to another mobile phone B>
Next, the operation in the case of connection from the mobile phone A to the mobile phone B will be described with reference to the sequence chart of FIG. Mobile phone A and mobile phone B may be of the same mobile phone operator or different mobile phone operators, but in the following, mobile phone A and mobile phone B are of different mobile phone operators. It is assumed that the mobile phone carrier A and the mobile phone carrier B are respectively. Further, a gateway device and a mobile phone network corresponding to the mobile phone operator A are referred to as a gateway device 3A and a mobile phone network 1A, respectively. The same applies to mobile phone operator B.

  When the extension number B is dialed as the called number in the mobile phone A having the number 090-A, a call connection signal including the extension number B including 090-A is issued from the mobile phone A as the called number. The The call connection signal is transferred within the cellular phone network 1A and reaches the gateway device 3A (step 21). The gateway device 3A transfers the call connection signal to the inter-network number conversion device 5 (step 22).

  In the inter-network number conversion device 5 that has received the call connection signal, the inter-network number conversion unit 52 refers to the number information storage unit 54 (FIG. 3) to change the calling number in the call connection signal from 090-A to 050-A. (Step 23). Then, the routing function unit 53 refers to the routing information storage unit 55 (FIG. 4) to transfer the call connection signal having the extension number B as the called number to the call control device 6 (step 24).

  In the call control device 6 that has received the call connection signal, the extension number conversion unit 62 refers to the extension number information storage unit 64 (FIG. 6) to convert the called number of the call connection signal from the extension number B to 050-B. At the same time, the calling number is converted from 050-A to extension number A (step 25).

Next, the routing function unit 63 refers to the routing information storage unit 65 (FIG. 8) to determine that the transfer destination of the call connection signal whose called number is 050-B is the inter-network number conversion device 5. Then, the call connection signal is transferred to the network number converter 5 (step 26).
In the inter-network number conversion device 5 that has received the call connection signal, the inter-network number conversion unit 52 refers to the number information storage unit 54 (FIG. 3), so that the called number in the call connection signal is changed from 050-B. The mobile phone number is converted into 090-B (step 27).

  Then, the routing function unit 53 in the inter-network number conversion device 5 refers to the routing information storage unit 55 (FIG. 4) to send the call connection signal to the gateway device 3B corresponding to the mobile phone operator B of 090-B. Transfer (step 28).

  The gateway device 3B issues the call connection signal to the mobile phone network 1B. In the mobile phone network 1B, the call connection signal reaches the mobile phone B via the switching device 4B (step 29), and the mobile phone B rings. A user call is made. Then, when the user off-hooks the mobile phone B, a response is returned (step 30), and a call between the mobile phone A and the mobile phone B is started (step 31).

  In FIG. 11, the voice communication path between the mobile phone B and the gateway device 3B, the voice communication path between the gateway device 3A and the gateway device 3B, and the voice communication path between the mobile phone A and the gateway device 3A are shown. Although an example in which a call is made between the mobile phone A and the mobile phone B by connection is shown, the audio path between the mobile phone A and the mobile phone B is not limited to this.

  As described above, by adopting the above system, it becomes possible to use an extension call between mobile phones of different operators. Therefore, it becomes possible to use the mobile phones of a plurality of business operators in different departments or the same department, and the mobile phone business operators can be selected according to the usage applications of the departments or individuals, thereby improving convenience. In addition, since the extension telephone can be used between different mobile operators, the call charge is free and the cost can be reduced for the user.

  The present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Mobile telephone network 2 IP telephone network 3 Gateway apparatus 4 Switching apparatus 5 Internet number conversion apparatus 6 Call control apparatus 51 Signal transmission / reception part 52 Internet number conversion part 53 Routing function part 54 Number information storage part 55 Routing information storage part 61 Signal Transmission / reception unit 62 Extension number conversion unit 63 Routing function unit 64 Extension number information storage unit 65 Routing information storage unit

Claims (4)

The second telephone in the telephone network in which a plurality of first telephone networks that are telephone networks of a plurality of companies and a second telephone network are interconnected via a plurality of gateway devices corresponding to the respective companies. A call control system provided in a network,
In addition to the telephone number for the first telephone network, a telephone number and an extension number for the second telephone network are assigned to a telephone terminal connected to the first telephone network and used as an extension telephone. The call control system is
Inter-network telephone number storage for storing the telephone number for the first telephone network assigned to the telephone terminal connected to the first telephone network and the telephone number for the second telephone network in association with each other Means,
Extension number storage means for storing the telephone number and the extension number for the second telephone network in association with each other;
When a call connection signal originating from the first telephone network and having an extension number as a called number is received via a gateway device corresponding to the first telephone network, the extension number storage means is referred to An extension number converting means for converting the extension number in the call connection signal into a telephone number for the second telephone network corresponding to the extension number;
By referring to the inter-network telephone number storage means, the telephone number for the second telephone network in the call connection signal whose destination number is converted by the extension number conversion means is the first corresponding to the telephone number. Network number conversion means for converting to a telephone number for the telephone network of
Transfer means for identifying a gateway device of a business operator corresponding to the called number included in the call connection signal whose call number is converted by the inter-network number conversion means, and transferring the call connection signal to the gateway device; A call control system comprising :
Storage means for storing identification information of a telephone terminal connected to the second telephone network and a telephone number for the second telephone network of the telephone terminal in association with each other;
The telephone number for the second telephone network in the call connection signal in which the called number is converted by the extension number conversion means with reference to the identification information of the telephone terminal stored in the storage means is the second telephone network. The telephone connection number is transferred to the telephone terminal, and the telephone number for the second telephone network is transferred to the telephone terminal of the telephone terminal connected to the second telephone network. And a means for transferring the call connection signal to the inter-network number conversion means when the telephone number is not a telephone number .   The call control system according to claim 1, wherein the first telephone network is a mobile telephone network, and the second telephone network is an IP telephone network. An extension telephone connection method in a telephone network in which a plurality of first telephone networks that are telephone networks of a plurality of carriers and a second telephone network are interconnected via a plurality of gateway devices corresponding to the respective carriers. There,
In addition to the telephone number for the first telephone network, a telephone number and an extension number for the second telephone network are assigned to a telephone terminal connected to the first telephone network and used as an extension telephone. In addition,
Inter-network telephone number storage for storing the telephone number for the first telephone network assigned to the telephone terminal connected to the first telephone network and the telephone number for the second telephone network in association with each other Means and an extension number storage means for storing the telephone number and the extension number for the second telephone network in association with each other. The extension telephone connection method comprises:
The extension number conversion means provided in the second telephone network sends a call connection signal that is transmitted from the first telephone network and has the extension number as a called number to the gateway device corresponding to the first telephone network. Extension number conversion for converting the extension number in the call connection signal into a telephone number for the second telephone network corresponding to the extension number by referring to the extension number storage means when received via Steps,
The second inter-network number conversion means provided in the second telephone network refers to the second inter-network telephone number storage means, whereby the second number in the call connection signal in which the called number is converted by the extension number conversion means. An inter-network number conversion step of converting a telephone number for the telephone network into a telephone number for the first telephone network corresponding to the telephone number;
The transfer means provided in the second telephone network identifies the gateway device of the business operator corresponding to the called number included in the call connection signal converted by the inter-network number converting means, and the gateway Transferring the call connection signal to a device;
The gateway device of the carrier corresponding to the called number sends the call connection signal to the first telephone network corresponding to the carrier, and the telephone terminal corresponding to the called number for the first telephone network and the call A communication path establishment step for establishing a telephone communication path with a transmission source telephone terminal of a connection signal, and an extension telephone connection method comprising :
The second telephone network further includes storage means for storing identification information of a telephone terminal connected to the second telephone network and a telephone number for the second telephone network of the telephone terminal in association with each other. Provided,
The telephone number for the second telephone network in the call connection signal in which the called number is converted by the extension number conversion means with reference to the identification information of the telephone terminal stored in the storage means is the second telephone network. The telephone connection number is transferred to the telephone terminal, and the telephone number for the second telephone network is transferred to the telephone terminal of the telephone terminal connected to the second telephone network. An extension telephone connection method comprising a step of transferring the call connection signal to the inter-network number conversion means when it is not a telephone number . The computer in the telephone network in which a plurality of first telephone networks that are telephone networks of a plurality of companies and a second telephone network are interconnected via a plurality of gateway devices corresponding to the respective companies. A program for functioning as a call control system provided in the telephone network of No. 2,
In addition to the telephone number for the first telephone network, a telephone number and an extension number for the second telephone network are assigned to a telephone terminal connected to the first telephone network and used as an extension telephone. Further, the second telephone network includes a telephone number for the first telephone network assigned to a telephone terminal connected to the first telephone network, and the second telephone network. Network telephone number storage means for storing the telephone numbers in association with each other, and extension number storage means for storing the telephone numbers for the second telephone network and the extension numbers in association with each other. The computer,
When a call connection signal originating from the first telephone network and having an extension number as a called number is received via a gateway device corresponding to the first telephone network, the extension number storage means is referred to An extension number conversion means for converting the extension number in the call connection signal into a telephone number for the second telephone network corresponding to the extension number;
By referring to the inter-network telephone number storage means, the telephone number for the second telephone network in the call connection signal whose callee number has been converted by the extension number conversion means is the first telephone number corresponding to the telephone number. An inter-network number conversion means for converting to a telephone number for one telephone network;
Function as transfer means for identifying the gateway device of the business operator corresponding to the called number included in the call connection signal whose called number has been converted by the inter-network number converting means and transferring the call connection signal to the gateway device is a program to be,
The second telephone network has storage means for storing the identification information of the telephone terminal connected to the second telephone network and the telephone number for the second telephone network of the telephone terminal in association with each other. The program further comprises the computer,
The telephone number for the second telephone network in the call connection signal in which the called number is converted by the extension number conversion means with reference to the identification information of the telephone terminal stored in the storage means is the second telephone network. The telephone connection number is transferred to the telephone terminal, and the telephone number for the second telephone network is transferred to the telephone terminal of the telephone terminal connected to the second telephone network. A program which further functions as means for transferring the call connection signal to the inter-network number conversion means when it is not a telephone number .

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