JP6208432B2 - Telephone transfer device, telephone transfer method, and program - Google Patents

Description

  The present invention relates to a telephone transfer device, a telephone transfer method, and a program.

  Generally, a 0AB to J number (subscription telephone number) is assigned to a wired subscriber telephone, and a technique for transferring an incoming call to this subscriber telephone number to another telephone is known. For example, in Patent Document 1, when an incoming call is received to a subscriber telephone number, the incoming call is forwarded to an IP telephone (forwarding destination) assigned with an IP (Internet Protocol) telephone number that is preset as forwarding destination information. A telephone transfer device is disclosed.

JP-A-2005-45382

  However, the telephone transfer device performs the transfer via a SIP (Session Initiation Protocol) server that manages the entire IP telephone system. For this reason, when the telephone transfer device and the transfer destination exist on the same premises, and the facilities for connecting to the IP network are shared, there is a problem that the load on the facilities increases during the transfer. As a result, transmission delay, fluctuation, and packet loss are likely to occur during voice communication, and the call quality between the transfer destination and the caller may deteriorate.

  The present invention is for solving such a problem, and even when the transfer destination and equipment for connecting to a predetermined public network are shared, the call quality between the transfer destination and the call source is improved. It is an object to provide a telephone transfer device, a telephone transfer method, and a program that can be maintained.

A telephone transfer device according to a first aspect of the present invention provides:
First public network communication means for connecting to the first public network;
A second public network communication means for connecting to the second public network;
A local area network communication means for connecting to the local area network;
Detecting means for detecting an incoming call to the first telephone number via the first public network communication means;
A predetermined request is made to the telephone sharing the second telephone number via the local area network communication means, and it is determined whether or not the telephone is connected via the local area network according to whether there is a response from the telephone. Connection possibility determination means to perform,
When the detection unit detects the incoming call, the telephone connected via the local network is called via the local network communication unit based on the determination result by the connection possibility determination unit, and the local network communication unit Calling means for calling the telephone not connected via a network via the second public network communication means;
When a telephone called via the local area network communication means responds to the call, the incoming call is transferred to the telephone via the local area network communication means, and via the second public network communication means Transfer means for transferring the incoming call to the telephone via the second public network communication means when the called telephone responds to the call;
The calling means is preset when the number of the telephones connected via the local network satisfies a predetermined number as a condition for not calling the telephone via the second public network communication means. A case where the telephone is connected via the local network is preset, and the telephone is not connected via the local network based on the determination result by the connection determination unit and the preset condition. Calling the telephone determined to be via the second public network communication means,
It is characterized by that.

The detecting means accepts a call by the first telephone number from a telephone sharing the second telephone number via the local area network communication means or the second public network communication means,
The transfer means performs communication between the caller telephone and the callee telephone via the local network communication means when the detection means accepts the call via the private network communication means, When the detection means accepts the call via the second public network communication means, the communication between the caller telephone and the call destination telephone may be performed via the second public network communication means. good.

The detection means accepts a transfer from a telephone communicating via the local area network communication means or the second public network communication means to another telephone sharing the second telephone number;
The call means determines whether or not the other telephone set as a transfer destination is connected via the local network when the detecting means accepts transfer to the other telephone set. If the other telephone is determined to be connected via the local network, the other telephone is called via the local network communication means, and the other telephone is If it is determined that the telephone is not connected via the local network, the other telephone is called via the second public network communication means,
When the other telephone called through the local network communication means responds to the call, the transfer means performs the transfer to the other telephone through the local network communication means, and the second telephone When the other telephone called via the public network communication means responds to the call, the transfer to the other telephone may be performed via the second public network communication means.

The telephone transfer method according to the second aspect of the present invention is:
The telephone transfer device
A detection step of detecting an incoming call to the first telephone number via the first public network communication unit;
Whether a plurality of telephones sharing the second telephone number make a predetermined request via the local area network communication unit, and whether or not each of the plurality of telephones is connected via the local area network according to the presence or absence of a response from the telephone A connectability determination step for determining whether or not
When the incoming call is detected in the detecting step, based on a result of determining whether the plurality of telephones are connected via the local network in the connection possibility determining step, The telephone connected via the local network is called via the local network communication unit, and the telephone not connected via the local network is called via the second public network communication unit. A calling step to call,
When a telephone called via the local network communication unit responds to the call, the incoming call is transferred to the telephone via the local network communication unit, and via the second public network communication unit A transfer step of transferring the incoming call to the telephone through the second public network communication unit when the called telephone responds to the call ;
In the calling step, a condition for not calling the telephone through the second public network communication unit is set in advance as a case where the number of the telephones connected through the local network satisfies a predetermined number. The telephone is connected via the local network in advance, and is not connected via the local network based on the determination result in the connection determination step and the preset condition. Calling the telephone determined to be via the second public network communication unit,
It is characterized by that.

The program according to the third aspect of the present invention is:
Computer
First public network communication means for connecting to the first public network;
A second public network communication means for connecting to the second public network;
Local network communication means for connecting to the local network;
Detecting means for detecting an incoming call to the first telephone number via the first public network communication means;
A predetermined request is made to a plurality of telephones sharing the second telephone number via the local area network communication means, and the plurality of telephones are respectively connected via the local area network according to the presence or absence of a response from the telephone. A connectability determination means for determining whether or not there is,
When the detection means detects the incoming call, the connection possibility determination means determines whether the plurality of telephones are connected via the local network, respectively. The telephone connected via the local network is called via the local network communication means, and the telephone not connected via the local network is called via the second public network communication means. Calling means to call,
When a telephone called via the local area network communication means responds to the call, the incoming call is transferred to the telephone via the local area network communication means, and via the second public network communication means When the called telephone responds to the call, the telephone is functioned as a transfer means for transferring the incoming call to the telephone via the second public network communication means ,
The calling means is preset when the number of the telephones connected via the local network satisfies a predetermined number as a condition for not calling the telephone via the second public network communication means. A case where the telephone is connected via the local network is preset, and the telephone is not connected via the local network based on the determination result by the connection determination unit and the preset condition. Calling the telephone determined to be via the second public network communication means,
It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, even when the equipment for connecting with a forwarding destination and a predetermined | prescribed public network is shared, the call quality of a forwarding destination and a transmission origin can be maintained favorable.

It is a figure which shows the installation aspect of the telephone transfer apparatus which concerns on embodiment of this invention. It is a block diagram which shows the structure of the telephone transfer apparatus shown in FIG. It is a figure which shows the structure of the own apparatus information memorize | stored in the memory | storage part of the telephone transfer apparatus shown in FIG. It is a figure which shows the structure of the connection permission information memorize | stored in the memory | storage part of the telephone transfer apparatus shown in FIG. FIG. 3 is a diagram showing a configuration of own device information stored in the IP telephone shown in FIG. 1. It is a figure which shows the structure of the extension telephone information memorize | stored in the IP telephone shown in FIG. It is a figure which shows the structure of the registration information memorize | stored in the SIP server shown in FIG. It is a flowchart for demonstrating the connection availability information update process which the telephone transfer apparatus which concerns on one embodiment of this invention performs. It is a flowchart for demonstrating the transfer process at the time of the subscriber telephone call which the telephone transfer apparatus which concerns on one embodiment of this invention performs. It is a flowchart for demonstrating the transfer process at the time of the subscriber telephone transmission which the telephone transfer apparatus which concerns on one embodiment of this invention performs. It is a flowchart for demonstrating the transfer process at the time of a subscriber telephone call which the telephone transfer apparatus which concerns on one embodiment of this invention performs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, an installation example of the telephone transfer device 10 will be described with reference to FIG. The telephone transfer device 10 includes a router having a PBX (Private Branch eXchange) function and a VoIP (Voice over Internet Protocol) conversion function.

  The telephone transfer device 10 includes a LINE port P1 for connecting to the public switched network TN and a WAN (Wide Area Network) port P2 for connecting to the wide area communication network WN. The telephone transfer device 10 is used in a state where predetermined cables are connected to the LINE port P1 and the WAN port P2, respectively, and makes / receives calls using a subscriber telephone number or an IP telephone number. The telephone transfer device 10 includes a TEL port P3 for connecting to the fixed telephone T, and is used together with the fixed telephone T in a state where a predetermined cable is connected to the TEL port P3.

  The subscriber telephone number is a unique telephone number assigned by a telephone company that provides a general wired subscriber telephone service.

  On the other hand, the IP telephone number is a unique telephone number assigned by an ISP (Internet Services Provider) company that provides an IP telephone service. The IP telephone number is shared by a preset number (for example, “4”). Assume that the same IP telephone number is assigned to the telephone transfer device 10, the PC 20a, and the portable terminals 20b and 20c shown in FIG. Information for uniquely identifying each device is assigned to each device (telephone transfer device 10, PC 20a, portable terminals 20b and 20c) sharing the IP telephone number.

  When voice communication is performed via the public switched network TN, that is, when voice communication is performed using a subscriber telephone number, the telephone transfer device 10 uses the PC 20a, portable terminals 20b and 20c (IP Used as a base unit of the telephone 20). The telephone transfer device 10 performs various transfer processes with each IP telephone 20 used as its own handset.

  The telephone transfer device 10 has a function for connecting to the local area network LN. The connection to the local network LN may be either wired or wireless. The telephone transfer device 10 communicates with a PC 20a in which a wired cable is connected to the LAN port P4. In addition, the telephone transfer device 10 performs wireless communication with the mobile terminal 20b existing in a predetermined area.

  The telephone transfer device 10 determines whether or not the IP telephone 20 as the transfer destination is connected via the local network LN, and in accordance with the determination result, either the local network LN or the wide area communication network WN communicates. A network is selected, and transfer to the IP telephone 20 is performed via the selected communication network.

  When transferring to the IP telephone 20 (for example, the portable terminal 20c) via the wide area communication network WN, the telephone transfer device 10 communicates with the SIP server 30. The SIP server 30 is a server for operating the IP telephone service. The SIP server 30 relays the transfer to the IP telephone 20 in accordance with a request from the telephone transfer device 10.

  The telephone transfer apparatus 10 is a facility for connecting to the IP telephone 20 used as a slave unit via the wide area network WN when performing communication via the public switched network TN (when using a subscriber telephone number). To reduce the load. Thereby, transmission delay and fluctuation at the time of telephone transfer, occurrence of packet loss can be suppressed, and good call quality can be maintained.

  Next, the configuration of the telephone transfer device 10 shown in FIG. 1 will be described with reference to FIG.

  The telephone transfer device 10 includes a control unit 11, a storage unit 12, a local area network communication unit 13, a public switched network communication unit 14, a wide area network communication unit 15, a telephone communication unit 16, an operation unit 17, And a display unit 18.

  The local network communication unit 13 is for connecting to the local network LN, and includes a wired communication unit 13a and a wireless communication unit 13b. The wired communication unit 13a and the wireless communication unit 13b perform packet communication with the local area network LN. Under the control of the control unit 11, the wired communication unit 13a and the wireless communication unit 13b perform processing (encoding, packetization, etc.) for transmitting various types of information to the local area network LN, and various types of information received from the local area network LN. Processing for extraction (reverse packetization, decoding, etc.) is performed.

  The wired communication unit 13a includes a wired LAN interface device. The wired communication unit 13a communicates with the IP telephone 20 (PC 20a shown in FIG. 1) connected to the LAN port P4 under the control of the control unit 11.

  On the other hand, the wireless communication unit 13b includes a wireless LAN interface device. Under the control of the control unit 11, the wireless communication unit 13 b performs wireless communication with the IP telephone 20 (mobile terminal 20 b shown in FIG. 1) existing in the communication area via the antenna.

  The public switched network communication unit 14 includes a PSTN (Public Switched Telephone Networks) interface device. The public exchange network communication unit 14 is for connecting to the public exchange network TN via the LINE port P1. The public exchange network communication unit 14 performs analog communication with the public exchange network TN under the control of the control unit 11. The public switched network communication unit 14 performs outgoing / incoming calls using a subscriber telephone number for one line assigned to the telephone transfer device 10.

  The wide area network communication unit 15 includes an IP network interface device. The wide area communication network communication unit 15 is for connecting to the wide area communication network WN via the WAN port P2. The wide area network communication unit 15 performs packet communication with the wide area communication network WN under the control of the control unit 11. Calls are made using the IP telephone number for one line assigned to the telephone transfer device 10. Under the control of the control unit 11, the wide area communication network communication unit 15 performs processing (encoding, packetization, etc.) for transmitting various types of information to the wide area communication network WN, and extracts various types of information received from the wide area communication network WN. To perform processing (reverse packetization, decoding, etc.).

  The telephone communication unit 16 includes an analog telephone interface device such as FXS (Foreign eXchange Station). The telephone communication unit 16 is for connecting to the fixed telephone T via the TEL port P3. The telephone communication unit 16 performs analog communication with the fixed telephone T under the control of the control unit 11. The telephone communication unit 16 performs various operations such as dialing, forwarding, holding, off-hook, on-hook, etc., calling of the fixed telephone T, voice communication, etc. performed in the fixed telephone T.

  The operation unit 17 includes a user input interface device that receives user input operations. The operation unit 17 supplies an operation signal corresponding to a user input operation to the control unit 11.

  The display unit 18 includes a display device such as a liquid crystal display device or an organic EL (Electro Luminescence) display device. The display unit 18 displays various corresponding images based on various image data supplied from the control unit 11 under the control of the control unit 11.

  The storage unit 12 includes a storage device such as a hard disk drive (HDD), a read only memory (ROM), and a flash memory. The storage unit 12 stores various programs and data used by the control unit 11 to perform various processes, and various data generated or acquired by the control unit 11 performing various processes.

  Further, the storage unit 12 stores a program 12a, own device information 12b, and connectability information 12c.

  The program 12a is executed by the control unit 11 when the power of the telephone transfer device 10 is turned on, for example, and performs a transfer process described later. The program 12a is executed by the control unit 11 until the telephone transfer device 10 is turned off or until the user performs an operation to stop the execution of the program 12a.

  For example, as shown in FIG. 3, the own device information 12b includes an IP telephone number, a user ID, a password, an extension number, a SIP server address, a WAN IP address, and the like. Among these, the IP telephone number, user ID, and password are information (login information) for performing login authentication in the SIP server 30 and are separately notified to the user (IP telephone service subscriber) in advance. The own device information 12b is the authentication information notified in advance by the user (or the substitute) when the program 12a stored in the telephone transfer device 10 is executed for the first time, and the SIP server 30 authenticates normally. Is obtained from the SIP server 30. The IP telephone number, user ID, password, and extension number are identification information given to the telephone transfer device 10 that functions as a base unit. The SIP server address is information for accessing the SIP server 30 and is used when communication is performed via the SIP server 30. The WAN IP address is information for specifying the position of the telephone transfer device 10 on the wide area communication network WN.

  For example, as shown in FIG. 4, the connection permission / prohibition information 12c includes an IP telephone number, user ID, extension number, connection state, LAN IP address, and the like. The connectability information 12c is information indicating whether or not the IP telephone 20 sharing the IP telephone number assigned to the telephone transfer device 10 main body is connected via the local network LN. The user ID and extension number are identification information assigned to the IP telephone 20 shared with itself. The connection state is information indicating whether or not the IP telephone 20 corresponding to the user ID is connected to the local area network LN. The LAN IP address is information for specifying the position of the IP telephone 20 on the local area network LN. The connection permission / prohibition information 12c is acquired from the SIP server 30 when the SIP server 30 is normally authenticated, such as when the program stored in the telephone transfer device 10 is executed for the first time, as with the own device information 12b. The The connection availability information 12c is updated at a predetermined timing. The process for updating the connection availability information 12c will be described later.

  The control unit 11 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory) that functions as a main memory of the CPU, and the like. Further, the control unit 11 may include an integrated logic IC (Integrated Circuit) such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The control unit 11 controls the entire telephone transfer device 10 by controlling each part of the telephone transfer device 10.

  Further, the control unit 11 functions as a detection unit 11a, a connectability determination unit 11b, a calling unit 11c, and a transfer unit 11d by executing the program 12a stored in the storage unit 12. The control unit 11 functions as the units 11a to 11d, thereby realizing a PBX function and a VoIP conversion function.

  Next, with reference to FIG. 5, the configuration of own device information 21 stored in each IP telephone 20 shown in FIG. 1 will be described.

  The own device information 21 includes an IP telephone number, a user ID, a password, an extension number, a SIP server address, a LAN IP address, a WAN IP address, and the like. Among them, the IP phone number, user ID, and password are information (login information) for performing login authentication in the SIP server 30 in the same manner as the own device information 12b, and are separately notified to the user (IP phone service subscriber) in advance. Is done. The own machine information 21 is inputted with the authentication information notified in advance by the user (or the substitute) when the program stored in the IP telephone 20 is first executed, and the SIP server 30 is normally authenticated. Is acquired from the SIP server 30. The IP telephone number, user ID, password, and extension number are identification information given to the IP telephone 20 that functions as a slave unit of the telephone transfer device 10. The SIP server address is used when communication is performed via the SIP server 30 connected to the wide area communication network WN. The LAN IP address is information for specifying the position of the IP telephone 20 on the local network LN, and is given by the telephone transfer device 10 when connected via the local network LN. The WAN IP address is information for specifying the position of the IP telephone 20 on the wide area communication network WN, and is not registered when connected via the local area network LN.

  Next, the configuration of the extension telephone information 22 stored in the IP telephone 20 shown in FIG. 1 will be described with reference to FIG.

  The extension telephone information 22 includes an IP telephone number, a user ID, an extension number, a WAN IP address, and the like. The user ID and the extension number are identification information given to the telephone transfer device 10 or the IP telephone 20 that shares the IP telephone number with itself, like the connection permission / inhibition information 12c. The WAN IP address is information for specifying the position of the telephone transfer device 10 on the wide area communication network WN, and is registered when connected to the telephone transfer device 10 via the local area network LN. The extension telephone information 22 is acquired from the SIP server 30 when the SIP server 30 is normally authenticated, such as when the program stored in the IP telephone 20 is executed for the first time, as with the own machine information 21. .

  Next, the configuration of the registration information 31 stored in the SIP server 30 shown in FIG. 1 will be described with reference to FIG.

  The registration information 31 includes an IP telephone number, a user ID, a password, a registration state, a WAN IP address, and the like. The registration information 31 includes, for each IP telephone number assigned by the ISP company, a registration state corresponding to the telephone transfer apparatus 10 and the IP telephone 20 that share the IP telephone number, the telephone transfer apparatus 10 on the wide area network WN, and Information for specifying the position of the IP telephone 20 is shown. The registration state is information indicating whether or not the telephone transfer device 10 and the IP telephone 20 that share the IP telephone number are normally registered. When the SIP server 30 is normally authenticated in accordance with a request from the telephone transfer device 10 or the IP telephone 20, the registration state corresponding to the telephone transfer apparatus 10 or the IP telephone 20 is updated to registered, and the telephone is not authenticated. The registration state corresponding to the transfer device 10 or the IP telephone 20 remains unregistered. The WAN IP address is acquired from the telephone transfer device 10 or the IP telephone set 20 based on the communication performed with the telephone transfer apparatus 10 or the IP telephone set 20 connected to the wide area communication network WN.

Next, processing when a subscriber telephone number is used in the telephone transfer apparatus 10 having the above configuration will be described. In this case, the telephone transfer device 10 performs the following processes (1) to (4).
(1) Processing for updating the connection availability information 12c at a predetermined timing (connection availability information updating processing).
(2) A process of transferring an incoming call to the IP telephone 20 that shares the IP telephone number when the incoming call arrives at the subscriber telephone number (transfer process when the incoming telephone call arrives).
(3) A process of making a call using a subscriber telephone number in response to a request from the IP telephone 20 (a transfer process at the time of calling the subscriber telephone).
(4) Processing for transferring to another IP phone 20 in response to a request from the IP phone 20 performing voice communication (transfer processing at the time of joining telephone call).

  When the power of the telephone transfer device 10 is turned on, the control unit 11 reads the program 12a from the storage unit 12 and executes it. As a result, the control unit 11 functions as the detection unit 11a, the connectability determination unit 11b, the calling unit 11c, and the transfer unit 11d. Processing is performed in a time-sharing manner.

  With reference to FIG. 10, the update process of the connectability information 12c shown in (1) above will be described.

  The connectability determination unit 11b determines whether a preset timing for updating the connectability information 12c stored in the storage unit 12 has arrived (step SA01). The timing for updating the connection permission / prohibition information 12c is, for example, when a request for obtaining a LAN IP address is received from the IP telephone set 20, or every certain time (for example, 30 minutes).

  The connectability determination unit 11b determines whether or not the timing for updating the connectability information 12c has arrived (step SA01), and enters a standby state until the update timing arrives (step SA01; NO). When it is determined that the timing for updating the connection availability information 12c has arrived (step SA01; YES), the connection availability determination unit 11b updates the connection availability information 12c (step SA02).

  Specifically, the connectability determination unit 11b reads the connectability information 12c from the storage unit 12, and generates inquiry information for each IP phone 20 represented by the connectability information 12c. The inquiry information includes, for example, the IP telephone number, user ID, LAN IP address, etc., of the IP telephone set 20 extracted from the connection availability information 12c. The connectability determining unit 11b transmits the generated inquiry information via the local area network communication unit 13 (wired communication unit 13a and wireless communication unit 13b).

  The IP telephone 20 (PC 20a and portable terminal 20b shown in FIG. 1) connected to the local network LN receives the inquiry information transmitted from the telephone transfer device 10 and generates response information in response to the received inquiry information. To do. The IP telephone 20 transmits the generated response information to the telephone transfer device 10 via the local area network LN.

  When receiving the response information via the local area network communication unit 13 (wired communication unit 13a and wireless communication unit 13b), the connection enable / disable determining unit 11b of the telephone transfer device 10 transmits the response information in the connection enable / disable information 12c. The connection state of the telephone 20 is updated to a connection state (connectable) indicating that the telephone 20 is connected via the local area network LN.

  In this way, the connectability determination unit 11b inquires whether each IP telephone set 20 represented by the connectability information 12c is connected via the local area network LN, and updates the connection state based on whether there is a response to the inquiry. As a result, the entire connectability information 12c is updated.

  Next, with reference to FIG. 11, the transfer process at the incoming time of the incoming call shown in (2) will be described.

  When the subscriber telephone number assigned to the telephone transfer device 10 is dialed in the caller telephone, a call signal is transmitted from the public switched network TN to the telephone transfer device 10.

  The detecting unit 11a of the telephone transfer device 10 determines that an incoming call to the subscriber telephone number has been detected when the call signal is received via the public switched network communication unit 14 (step SB01; YES). In this case, the detection unit 11 a transmits a calling signal to the fixed telephone T via the telephone communication unit 16. As a result, the fixed telephone T outputs a ringing tone according to the calling signal from the telephone transfer device 10. On the other hand, the detection unit 11a is in a standby state until receiving the call signal (step SB01; NO).

  Further, when the incoming call to the subscriber telephone number is detected, the calling unit 11c determines whether or not the connectability information 12c is stored in the storage unit 12 (step SB02). If the connection enable / disable information 12c is not stored in the storage unit 12 (step SB02; NO), the calling unit 11c does not perform incoming call transfer and returns to step SB01.

  On the other hand, when the connection availability information 12c is stored in the storage unit 12 (step SB02; YES), the calling unit 11c connects via the local network LN based on the connection status included in the connection availability information 12c. It is determined whether or not there is an IP telephone 20 that has been set (step SB03).

  For example, among the connection states included in the connection availability information 12c shown in FIG. 4, the connection states corresponding to the user IDs “** 001” and “** 002” indicate that the connection is made to the local area network LN. In this case, the calling unit 11c determines that there is an IP telephone 20 connected to the local network LN (step SB03; YES), and calls the IP telephone 20 via the local network communication unit 13 (step SB04). .

  In this case, the calling unit 11c generates call information for each IP telephone 20 to be called. The call information includes, for example, the IP telephone number, user ID, LAN IP address, etc. of the IP telephone 20 extracted from the connection availability information 12c. The calling unit 11c transmits the generated call information via the local area network communication unit 13 (wired communication unit 13a and wireless communication unit 13b).

  The IP telephone 20 (PC 20a and portable terminal 20b shown in FIG. 1) connected to the local network LN receives the call information transmitted from the telephone transfer device 10 and outputs a ringing tone based on the received call information. To do. That is, when an incoming call is received by the telephone transfer apparatus 10, a ringing tone is output not only from the fixed telephone T but also from the IP telephone 20 connected to the telephone transfer apparatus 10 via the local network LN. Is done.

  The call unit 11c is connected to the local network LN when it is determined in step SB02 that there is no IP telephone 20 connected to the local network LN (step SB03; NO) or after performing the process of step SB04. It is determined whether or not there is an IP telephone 20 that is not connected (step SB05).

  For example, among the connection states included in the connection availability information 12c shown in FIG. 4, the connection state corresponding to the user ID “** 003” represents that the connection is not connected to the local area network LN. In this case, the calling unit 11c determines that there is an IP telephone 20 that is not connected to the local area network LN (step SB05; YES), and calls the IP telephone 20 via the wide area network communication unit 15 (step SB06). ).

  In this case, the calling unit 11c generates call information for each IP telephone 20 to be called. The call information includes, for example, the IP telephone number and user ID of the IP telephone 20 extracted from the connection availability information 12c, the user ID of the telephone transfer apparatus 10 extracted from the local apparatus information 12b, the SIP server address, the WAN IP address, and the like. . The calling unit 11 c transmits the generated call information via the wide area network communication unit 15.

  In this case, the SIP server 30 connected to the wide area communication network WN receives the call information transmitted from the telephone transfer device 10. The SIP server 30 extracts the WAN IP address corresponding to the IP telephone 20 represented by the received call information from the registration information 31 and generates new call information by excluding the SIP server address from the original call information. This is transmitted to the wide area communication network WN.

  The IP telephone set 20 (mobile terminal 20c shown in FIG. 1) connected to the wide area network WN receives the call information transmitted from the SIP server 30, and outputs a ring tone based on the received call information. That is, when the telephone transfer device 10 receives an incoming telephone number, a ringing tone is also output from the IP telephone 20 connected via the wide area communication network WN. At this time, the IP telephone set 20 acquires the WAN IP address of the telephone transfer device 10 included in the call information, so that the communication via the telephone transfer device 10 and the wide area network WN does not go through the SIP server 30. (It becomes possible to perform direct packet communication)

  The transfer unit 11d determines in step SB05 that there is no IP telephone 20 that is not connected to the local network LN (step SB05; NO), or performs the process of step SB06 and then calls the IP telephone 20 that is called in step SB04. Whether or not the IP telephone 20 called in step SB06 responds (step SB07, step SB09). The transfer unit 11d performs the monitoring until there is a response from any IP telephone 20 (step SB07; NO, step SB09; NO).

  If any of the IP telephones 20 connected to the local network LN (PC 20a and portable terminal 20b shown in FIG. 1) detects an off-hook according to the user's operation, the IP telephone 20 Generate response information to answer the call. The IP telephone 20 transmits the generated response information to the telephone transfer device 10 via the local area network LN.

  The transfer unit 11d of the telephone transfer device 10 receives the response information via the local area network communication unit 13, and determines that the IP telephone 20 connected to the local area network LN has responded (step SB07; YES). Also, the transfer unit 11d specifies the IP phone 20 that is the transfer destination to which the incoming call is detected in step SB01, from the IP phone number, user ID, LAN IP address, etc. of the IP phone 20 included in the received response information. The transfer unit 11d performs incoming call transfer to the identified IP telephone 20 via the local area network LN (step SB08).

  In this case, the transfer unit 11d transmits a response signal to the public switched network TN via the telephone communication unit 16. When the caller telephone receives the response signal via the public switched network TN, the caller telephone can perform voice communication (call) with the destination IP telephone 20 via the telephone transfer device 10. It becomes a state. Note that a ringing tone is output to the caller telephone until voice communication is possible.

  On the other hand, when an off-hook is detected according to the user's operation in any of the IP telephones 20 not connected to the local network LN (the mobile terminal 20c shown in FIG. 1), the IP telephone 20 Generate response information to answer the call. The IP telephone 20 transmits the generated response information to the telephone transfer device 10 via the wide area communication network WN.

  The transfer unit 11d of the telephone transfer device 10 receives the response information via the wide area network communication unit 15, and determines that the IP telephone 20 not connected to the local area network LN has responded (step SB09; YES). Also, the transfer unit 11d specifies the IP phone 20 as the transfer destination to which the incoming call transfer detected in step SB01 is made, based on the IP phone number of the IP phone 20, the user ID, etc. included in the received response information. In addition, the transfer unit 11b acquires the WAN IP address of the IP phone 20 included in the response information. As a result, communication via the telephone transfer device 10 and the wide area communication network WN can be performed without going through the SIP server 30 (direct packet communication can be performed). The transfer unit 11d performs incoming call transfer to the identified IP telephone 20 via the wide area communication network WN (step SB10).

  In this case, the transfer unit 11d transmits a response signal to the public switched network TN via the telephone communication unit 16 as in step SB08. When the caller telephone receives the response signal via the public switched network TN, the caller telephone can perform voice communication (call) with the destination IP telephone 20 via the telephone transfer device 10. It becomes a state.

  The transfer unit 11d generates call stop information for stopping the call to the IP telephones 20 other than the IP telephone 20 that has responded to the call when performing the processing of Step SB08 and Step SB10.

  The transfer unit 11d transmits the call stop information to the IP telephone 20 connected to the local network LN via the local network communication unit 13 (wired communication unit 13a and wireless communication unit 13b). On the other hand, the transfer unit 11d transmits the call stop information to the IP telephone 20 that is not connected to the local network LN via the wide area network communication unit 15. The IP telephone 20 that has received the call stop information stops outputting the ringing tone based on the received call stop information. Note that the transfer unit 11d also stops the transmission of the calling signal to the fixed telephone T via the telephone communication unit 16. As a result, the fixed telephone T stops outputting the ringing tone.

  Thereafter, the transfer unit 11d returns to Step SB01 and repeats the same processing as described above.

  As described above, when the incoming call to the subscriber telephone number is received, the telephone transfer device 10 calls the IP telephone 20 connected via the local network LN via the local network LN and is not connected via the local network LN. The IP telephone 20 is called through the wide area network WN. In addition, when the IP telephone 20 connected via the local network LN responds to the call, the telephone transfer device 10 transfers the incoming call to the IP telephone 20 via the local network LN. When the IP telephone 20 that is not connected via the telephone responds to the call, the incoming call transfer to the IP telephone 20 is performed via the wide area network WN.

  When the off-hook is detected in the fixed telephone T according to the user's operation, the transfer unit 11d transmits the call stop information to all the IP telephones 20 represented by the connection availability information 12c, and all the IP telephones 20 The ringing tone output from the telephone 20 is stopped.

  Next, with reference to FIG. 10, the subscriber telephone call transfer process shown in (3) above will be described.

  When the user operates the IP phone 20 and performs a call operation by inputting a destination number with a predetermined number (for example, “0000”) added before the destination phone number, the IP phone 20 Make a call by phone number.

  Specifically, when the IP telephone 20 is connected to the telephone transfer device 10 via the local network LN, the IP telephone 20 includes the destination number input by the user, the IP telephone number of the telephone transfer device 10, Call request information including a user ID, a WAN IP address, a user ID of the caller IP telephone 20, a LAN IP address, and the like is generated and transmitted to the telephone transfer device 10 via the local network LN.

  On the other hand, when the IP telephone 20 is not connected to the telephone transfer device 10 via the local network LN, the IP telephone 20 has the destination number input by the user, the IP telephone number of the telephone transfer device 10, the user ID, Call request information including the user ID, SIP server address, WAN IP address, etc. of the caller IP telephone 20 is generated and transmitted to the wide area network WN.

  In this case, the SIP server 30 connected to the wide area communication network WN receives the call request information transmitted from the IP telephone set 20. The SIP server 30 extracts a WAN IP address corresponding to the telephone transfer device 10 represented by the received call request information from the registration information 31, and excludes the SIP server address from the original call request information to create a new call. Request information is generated and transmitted to the wide area communication network WN.

  The detection unit 11a of the telephone transfer device 10 accepts a request for outgoing call from the IP telephone 20 using a subscriber telephone number. When receiving the call request information via the local area network communication unit 13 or the wide area network communication unit 15, the detection unit 11a determines that there is a call request from the IP telephone 20 using the subscriber telephone number (step SC01; YES). On the other hand, the detection unit 11a is in a standby state until receiving the transmission request information (step SC01; NO).

  When the transfer unit 11d determines that the detection unit 11a has received the call request information via the local area network communication unit 13 (step SC02; YES), the IP phone of the caller IP telephone set 20 included in the call request information From the number, user ID, LAN IP address, etc., the IP telephone 20 that made the call request is specified. Further, the transfer unit 11d transmits a calling signal from the telephone communication unit 16 via the public switched network TN based on the destination number included in the transmission request information. Thereafter, when an off-hook is detected in the destination telephone and the transfer unit 11d receives a response signal from the public switched network TN via the telephone communication unit 16, the telephone transfer device 10 communicates with the destination telephone. Voice communication can be performed. The transfer unit 11d transfers the voice communication from the destination telephone to the identified IP phone 20 that has made a request (requested a call) via the local area network communication unit 13 (wired communication unit 13a or wireless communication unit 13b). .

  On the other hand, the transfer unit 11d determines that the detection unit 11a has received the call request information without going through the local area network communication unit 13 (step SC02; NO), that is, the call request through the wide area network communication unit 15. The IP telephone 20 that made the call request is specified from the user ID of the caller IP telephone set 20 included in the call request information that received the information. The IP telephone 20 that made the call request is specified from the IP telephone number, user ID, etc. of the IP telephone 20 that is the caller. In addition, the transfer unit 11d acquires the WAN IP address of the caller IP telephone set 20 included in the call request information. As a result, communication via the telephone transfer device 10 and the wide area communication network WN can be performed without going through the SIP server 30 (direct packet communication can be performed). The transfer unit 11d transmits a call signal from the telephone communication unit 16 via the public switched network TN based on the destination number included in the call request information. Thereafter, when an off-hook is detected in the destination telephone and the transfer unit 11d receives a response signal from the public switched network TN via the telephone communication unit 16, the telephone transfer device 10 communicates with the destination telephone. Voice communication can be performed. The transfer unit 11d transfers the voice communication from the destination telephone to the identified IP telephone 20 (which has made a call request) via the wide area network communication unit 15 (step SC04).

  Thereafter, the transfer unit 11d returns to Step SB01 and repeats the same processing as described above.

  In this way, when a call request from the subscriber telephone number by the IP telephone 20 is made via the local area network LN, the telephone transfer device 10 relays voice communication between the caller IP telephone 20 and the callee telephone. Is performed via the local network LN. On the other hand, when a call request from the subscriber telephone number by the IP telephone 20 is made via the wide area network WN, the voice communication relay between the caller IP telephone 20 and the call destination telephone is made via the wide area network WN. Do.

  Next, with reference to FIG. 11, the transfer process at the time of a subscriber telephone call shown in the above (4) will be described.

  The IP telephone 20 that performs voice communication via the public switched network TN accepts a transfer request to the telephone transfer device 10 that shares the IP telephone number or another IP telephone 20. For example, the user confirms the extension number represented by the extension telephone information 22 on the screen of the IP telephone 20 performing voice communication, and performs an operation of designating the extension number corresponding to the transfer destination. According to this operation, the IP telephone 20 generates transfer request information including the extension number, user ID, etc. of the IP telephone 20 (transfer destination) designated by the user, and transmits this to the telephone transfer apparatus 10.

  When the transfer source IP telephone 20 is connected to the telephone transfer apparatus 10 via the local network LN, the IP telephone 20 transmits the generated transfer request information to the telephone transfer apparatus 10 via the local network LN.

  On the other hand, when the IP telephone 20 as the transfer source is not connected to the telephone transfer device 10 via the local network LN, the IP telephone 20 transmits the generated transfer request information to the wide area communication network WN. In this case, the transfer request information does not include the WAN IP address of the telephone transfer device 10 but includes the SIP server address, and the transfer request information is transmitted to the SIP server 30.

  In this case, the SIP server 30 connected to the wide area communication network WN receives the call request information transmitted from the IP telephone 20 that is the transfer source. The SIP server 30 extracts the WAN IP address corresponding to the telephone transfer device 10 represented by the received transfer request information from the registration information 31 and excludes the SIP server address from the original transfer request information to create a new transfer. Request information is generated and transmitted to the wide area communication network WN.

  In this manner, the telephone transfer device 10 receives a transfer request from the IP telephone 20 during a subscriber telephone call to another telephone via the local area network LN or the wide area communication network WN.

  When receiving the transfer request information via the local area network communication unit 13 or the wide area network communication unit 15, the detection unit 11a determines that there is a transfer request from the IP telephone 20 (step SD01; YES). On the other hand, the detection unit 11a is in a standby state until receiving the transmission request information (step SD01; NO).

  The calling unit 11c refers to the connection availability information 12c stored in the storage unit 12 and determines the transfer destination based on the connection state corresponding to the user ID and extension number of the transfer destination IP phone 20 included in the transfer request information. It is determined whether or not the IP telephone 20 is connected to the local network LN (step SD02).

  When the call unit 11c determines that the IP phone 20 as the transfer destination is connected to the local network LN (step SD02; YES), the call unit 11c generates call information for calling the IP phone 20. The call information includes, for example, the IP telephone number, user ID, LAN IP address, etc. of the IP telephone 20 extracted from the connection availability information 12c. The calling unit 11c transmits the generated call information via the local area network communication unit 13 (wired communication unit 13a and wireless communication unit 13b) (step SD03).

  The destination IP telephone 20 receives the call information transmitted from the telephone transfer device 10 and outputs a ringing tone based on the received call information. Thereafter, when an off-hook is detected in accordance with a user operation in the transfer destination IP telephone 20, the IP telephone 20 generates response information that responds to a call from the telephone transfer apparatus 10. The IP telephone 20 transmits the generated response information to the telephone transfer device 10 via the local area network LN.

  After transmitting the call information, the transfer unit 11d of the telephone transfer device 10 determines whether or not there is a response from the transfer destination IP telephone 20 (step SD04). When receiving the response information via the local area network communication unit 13, the transfer unit 11d determines that there is a response from the IP telephone 20 as the transfer destination (step SD04; YES). In this case, the transfer unit 11d terminates the transfer of the voice communication to the IP telephone 20 that is the transfer source, and performs the voice communication with the public switched network TN (the other party) to the private network communication unit 13 (the wired communication unit 13a or the wireless The data is transferred to the IP telephone 20 as the transfer destination via the communication unit 13b), and mutual voice communication is controlled (step SD05). It should be noted that a ringing tone is output to the caller telephone set from when the transfer request is made at the transfer destination IP telephone 20 until voice transfer is possible at the transfer source IP telephone 20.

  In step SD02, the call unit 11c generates call information for calling the IP telephone set 20 when it is determined that the transfer destination IP telephone set 20 is not connected to the local area network LN (step SD02; NO). To do. The call information includes, for example, the IP telephone number and user ID of the IP telephone 20 extracted from the connection availability information 12c, the user ID of the telephone transfer apparatus 10 extracted from the local apparatus information 12b, the SIP server address, the WAN IP address, and the like. . The calling unit 11c transmits the generated call information via the wide area network communication unit 15 (step SD06).

  In this case, the SIP server 30 connected to the wide area communication network WN receives the call information transmitted from the telephone transfer device 10. The SIP server 30 extracts the WAN IP address corresponding to the IP telephone 20 represented by the received call information from the registration information 31 and generates new call information by excluding the SIP server address from the original call information. This is transmitted to the wide area communication network WN.

  The IP telephone set 20 (mobile terminal 20c shown in FIG. 1) connected to the wide area network WN receives the call information transmitted from the SIP server 30, and outputs a ring tone based on the received call information. At this time, the IP telephone set 20 acquires the WAN IP address of the telephone transfer device 10 included in the call information, so that the communication via the telephone transfer device 10 and the wide area network WN does not go through the SIP server 30. (Direct packet communication can be performed). Thereafter, when the off-hook is detected in the IP telephone 20 as the transfer destination, the IP telephone 20 generates response information responding to the received call information and transmits it to the telephone transfer device 10 via the wide area network WN. .

  After transmitting the call information, the transfer unit 11d of the telephone transfer device 10 determines whether or not there is a response from the transfer destination IP telephone 20 (step SD07). When receiving the response information via the wide area network communication unit 15, the transfer unit 11d determines that there is a response from the IP telephone 20 as the transfer destination (step SD07; YES). In this case, the transfer unit 11d terminates the voice communication with the IP phone 20 as the transfer source, and performs the voice communication with the public switched network TN (call partner) via the wide area network communication unit 15 as the destination IP. It transfers to the telephone 20 and controls mutual voice communication (step SD08).

  Thereafter, the transfer unit 11d returns to step SD01 and repeats the same processing as described above.

  In this way, the telephone transfer device 10 is configured such that the transfer destination IP telephone 20 designated by the IP telephone 20 performing voice communication via the public switched network TN is connected via the local network LN. In this case, the transfer to the IP telephone 20 of the transfer destination is performed via the local network LN, and when the transfer is not made via the local network LN, the transfer to the IP telephone 20 of the transfer destination is performed in the wide area communication network. Performed via WN.

  When the transfer unit 11d of the telephone transfer device 10 receives an on-hook signal or a disconnection signal from one telephone that is performing voice communication using a subscriber telephone number, the transfer unit 11d transfers the signal to the other telephone, thereby End voice communication when ending a call (end relay)

  As described above, according to the telephone transfer device 10 according to the present embodiment, when communication is performed via the public switched network TN (when a subscriber telephone number is used), the IP telephone 20 used as a slave unit And the load on the equipment for connecting via the wide area network WN. As a result, transmission delay and fluctuation at the time of telephone transfer, occurrence of packet loss can be suppressed, and good call quality can be maintained.

  Note that the telephone transfer device 10 may set in advance in the storage unit 12 a condition for not performing communication via the wide area network WN when an incoming call is received at the subscriber telephone number. As a condition for not calling the IP telephone set 20, for example, a preset IP telephone set 20 that does not perform communication via the wide area network WN when the number of IP telephone sets 20 connected to the local area network LN satisfies a predetermined number. When connected to the local network LN, communication via the wide area communication network WN is not performed. The calling unit 11 selects an IP telephone set 20 determined not to be connected via the local network based on a connection state for each IP telephone set 20 represented by the connection permission information 12 and a preset condition. You may call via the wide area network communication part 15.

  In addition, the telephone transfer device 10 may set in advance in the storage unit 12 the order and communication timing of the communication network used when an incoming call is received to the subscriber telephone number, the order of calling the IP telephone 20, the communication timing, and the like. For example, when an incoming call is received at a subscriber telephone number, a call is made in the order of the fixed telephone T connected to the telephone transfer device 10, the IP telephone 20 connected to the local network LN, and the IP telephone 20 connected to the wide area network WN. Further, the respective communication timings may be set such that 10 seconds have elapsed from the incoming call, 30 seconds have elapsed, or the like. The same applies to the order of calling the IP telephone 20 and the communication timing.

  In addition, the number of IP telephones 20 sharing the IP telephone number can be arbitrarily changed.

  The telephone transfer device 10 can be realized by a normal computer. Further, the telephone transfer device 10 may be configured by installing a program for executing the operation described in the above embodiment in a computer, and executing the installed program by the computer. The program may be recorded on a portable recording medium or the like. Examples of portable recording media include CD-ROM, DVD-ROM, BD-ROM, and MO. Further, the program may be installed in the computer from various portable recording media via various reading devices.

  Moreover, the method of providing a program to a computer is arbitrary. For example, the program may be uploaded to a bulletin board (BBS: Bulletin Board System) on a communication line and distributed to a computer via the communication line. The program may be transmitted by a modulated wave obtained by modulating a carrier wave with a signal representing the program, and a device that receives the modulated wave may demodulate the modulated wave to restore the program. Then, the computer activates this program and executes it in the same manner as other applications under the control of an OS (Operating System). Thus, the computer functions as the telephone transfer device 10 that performs the above-described operation.

DESCRIPTION OF SYMBOLS 10 Telephone transfer apparatus 11 Control part 11a Detection part 11b Connection availability determination part 11c Calling part 11d Transfer part 12 Storage part 12a Program 12b Own apparatus information 12c Connection availability information 13 Private network communication part 13a Wired communication part 13b Wireless communication part 14 Public exchange Network communication unit 15 Wide area communication network communication unit 16 Telephone communication unit 17 Operation unit 18 Display unit P1 LINE port P2 WAN port P3 TEL port P4 LAN port 20 IP telephone 20a PC (IP telephone)
20b, 20c Mobile terminal (IP phone)
21 Self-machine information 22 Extension telephone information 30 SIP server 31 Registration information TN Public exchange network (first public network)
WN wide area network (second public network)
LN Local network T Fixed telephone

Claims (5)

First public network communication means for connecting to the first public network;
A second public network communication means for connecting to the second public network;
A local area network communication means for connecting to the local area network;
Detecting means for detecting an incoming call to the first telephone number via the first public network communication means;
A predetermined request is made to the telephone sharing the second telephone number via the local area network communication means, and it is determined whether or not the telephone is connected via the local area network according to whether there is a response from the telephone. Connection possibility determination means to perform,
When the detection unit detects the incoming call, the telephone connected via the local network is called via the local network communication unit based on the determination result by the connection possibility determination unit, and the local network communication unit Calling means for calling the telephone not connected via a network via the second public network communication means;
When a telephone called via the local area network communication means responds to the call, the incoming call is transferred to the telephone via the local area network communication means, and via the second public network communication means Transfer means for transferring the incoming call to the telephone via the second public network communication means when the called telephone responds to the call;
The calling means is preset when the number of the telephones connected via the local network satisfies a predetermined number as a condition for not calling the telephone via the second public network communication means. A case where the telephone is connected via the local network is preset, and the telephone is not connected via the local network based on the determination result by the connection determination unit and the preset condition. Calling the telephone determined to be via the second public network communication means,
A telephone transfer device. The detecting means accepts a call by the first telephone number from a telephone sharing the second telephone number via the local area network communication means or the second public network communication means,
The transfer means performs communication between the caller telephone and the callee telephone via the local network communication means when the detection means accepts the call via the private network communication means, When the detection means accepts the call via the second public network communication means, communication between the caller telephone and the call destination telephone is performed via the second public network communication means.
The telephone transfer device according to claim 1 . The detection means accepts a transfer from a telephone communicating via the local area network communication means or the second public network communication means to another telephone sharing the second telephone number;
The call means determines whether or not the other telephone set as a transfer destination is connected via the local network when the detecting means accepts transfer to the other telephone set. If the other telephone is determined to be connected via the local network, the other telephone is called via the local network communication means, and the other telephone is If it is determined that the telephone is not connected via the local network, the other telephone is called via the second public network communication means,
When the other telephone called through the local network communication means responds to the call, the transfer means performs the transfer to the other telephone through the local network communication means, and the second telephone When the other telephone called through the public network communication means responds to the call, the transfer to the other telephone is performed through the second public network communication means.
The telephone transfer apparatus according to claim 1 or 2 , wherein The telephone transfer device
A detection step of detecting an incoming call to the first telephone number via the first public network communication unit;
Whether a plurality of telephones sharing the second telephone number make a predetermined request via the local area network communication unit, and whether or not each of the plurality of telephones is connected via the local area network according to the presence or absence of a response from the telephone A connectability determination step for determining whether or not
When the incoming call is detected in the detecting step, based on a result of determining whether the plurality of telephones are connected via the local network in the connection possibility determining step, The telephone connected via the local network is called via the local network communication unit, and the telephone not connected via the local network is called via the second public network communication unit. A calling step to call,
When a telephone called via the local network communication unit responds to the call, the incoming call is transferred to the telephone via the local network communication unit, and via the second public network communication unit A transfer step of transferring the incoming call to the telephone through the second public network communication unit when the called telephone responds to the call ;
In the calling step, a condition for not calling the telephone through the second public network communication unit is set in advance as a case where the number of the telephones connected through the local network satisfies a predetermined number. The telephone is connected via the local network in advance, and is not connected via the local network based on the determination result in the connection determination step and the preset condition. Calling the telephone determined to be via the second public network communication unit,
A telephone transfer method. Computer
First public network communication means for connecting to the first public network;
A second public network communication means for connecting to the second public network;
Local network communication means for connecting to the local network;
Detecting means for detecting an incoming call to the first telephone number via the first public network communication means;
A predetermined request is made to a plurality of telephones sharing the second telephone number via the local area network communication means, and the plurality of telephones are respectively connected via the local area network according to the presence or absence of a response from the telephone. A connectability determination means for determining whether or not there is,
When the detection means detects the incoming call, the connection possibility determination means determines whether the plurality of telephones are connected via the local network, respectively. The telephone connected via the local network is called via the local network communication means, and the telephone not connected via the local network is called via the second public network communication means. Calling means to call,
When a telephone called via the local area network communication means responds to the call, the incoming call is transferred to the telephone via the local area network communication means, and via the second public network communication means When the called telephone responds to the call, the telephone is functioned as a transfer means for transferring the incoming call to the telephone via the second public network communication means ,
The calling means is preset when the number of the telephones connected via the local network satisfies a predetermined number as a condition for not calling the telephone via the second public network communication means. A case where the telephone is connected via the local network is preset, and the telephone is not connected via the local network based on the determination result by the connection determination unit and the preset condition. Calling the telephone determined to be via the second public network communication means,
A program characterized by that.

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