JP4441526B2 - Data communication system and communication control method - Google Patents

Description

The present invention relates to a data communication system constituted by a large number of terminal devices connected via telephone lines (public communication lines) and a host computer , and a communication control method in a host computer constituting such a data communication system. .

  There are cases where a data communication system is configured by arranging a large number of terminal devices having communication functions at remote locations and connecting them to a host computer via a telephone line including a telephone exchange network. In such a data communication system, when there is a line connection request from a remote terminal device to the host computer, the host computer confirms the legitimacy of the terminal device before starting communication. The confirmation is performed on the communication after connecting the line once.

  In such a data communication system, a large number of terminal devices are arranged, and each terminal device is connected to a host computer only when necessary to transmit / receive information. However, the terminal device that requested connection is a legitimate terminal device. Therefore, there is a case where it is necessary to respond to an unscheduled connection request of a terminal device.

  In some cases, the operating environment of the data communication system is outside the management range of the system (for example, the customer environment). In such a case, the change of the operating environment by changing the telephone number, changing the telephone line mode (dial line or push line), or inserting a PBX (private branch exchange) is performed regardless of the setting of the data communication system. It is common.

Therefore, for example, when data communication is performed other than when the FAX is used using an existing FAX line, the environment of the company is changed by changing the organization of the company, changing the system configuration of the system, or changing the line. When there is a change, it may not be possible to call the partner terminal device from the host computer.
In this case, the host computer has to wait for a call from the terminal device, and cannot determine whether the terminal device has become unable to connect due to a failure or whether it has become unable to connect due to movement or removal of the line.

  The present invention has been made to solve such a problem, and in a data communication system comprising a host computer and many terminal devices connected via a telephone line, the operating environment on the terminal device side is changed. The object of the present invention is to make it possible for the host computer to recognize it and to ensure the connectivity between the host computer and the terminal device continuously even when the system environment changes.

In order to achieve the above object, the present invention provides a plurality of terminal devices connected to a telephone line including a telephone switching network that provides a service for notifying a caller number, and is connected to the telephone line and notified from the telephone line. A caller number detection notifying means for detecting and notifying a caller number to be sent, a host computer connected to the telephone line for data communication with the terminal device after receiving notification of the caller number detected from the means; Each of the terminal devices includes an identification code for distinguishing from other terminal devices and means for transmitting its own identification code prior to data communication with the host computer. Have.

The host computer is means for registering each identification code of a plurality of terminal devices constituting the system and a telephone number corresponding to each identification code, and a plurality of identification codes are provided for one identification code of the terminal device. The registration means that can register the telephone number of the telephone number, the caller number notified from the caller number detection notification means, and each telephone number registered in the registration means Discrimination means for discriminating whether or not there is, communication control means for controlling communication via the caller number detection notification means according to the discrimination result, and the caller regardless of the discrimination result by the discrimination means Connect to the telephone line via the number detection notification means to start communication with the terminal device that requested the communication, and the caller number notified from the caller number detection notification means is sent to the registration means. If the determination means determines that none of the recorded telephone numbers match, the identification code transmitted from the terminal device is acquired, and the identification code registered in the registration means is acquired. The communication control means is configured to check whether or not it matches any of the codes, and to continue communication with the terminal device if they match, and to stop connection to the telephone line if they do not match any of the codes. When the identification code acquired from the terminal means and the identification code acquired from the terminal device coincides with any one of the identification codes registered in the registration means, the caller number notified from the caller number detection notification means is matched. And a means for newly registering the telephone number for the identification code while leaving the previously registered number in the registration means.

In such a data communication system, when the identification code acquired from the terminal device does not match any of the identification codes registered in the registration means, the host computer displays or prints it. It is desirable to have means for outputting, notifying to the outside, or recording .

In that case, the determination means of the host computer is such that the caller number notified from the caller number detection notification means matches one of one or more telephone numbers for the identification code registered in the registration means. Then, it may be a means for discriminating that the request is a communication request from a terminal device in which the identification code is registered.
Furthermore, in these data communication systems, the host computer has means for storing the caller number notified from the caller number detection notification means and the information of the final confirmation history of the identification code acquired from the terminal device. Is desirable.

The communication control method according to the present invention also provides a caller number detection notification for detecting and notifying a caller number notified from a telephone line including a telephone switching network that provides a service for notifying the caller number. In the communication control method in the host computer connected to the telephone line and receiving the notification of the caller number detected from the means, connected to the telephone line, and data communication with the terminal device connected to the telephone line, The terminal device is a device having an identification code for distinguishing it from other terminal devices and means for transmitting its own identification code prior to data communication with the host computer. Each identification code of a terminal device that is a communication partner and a telephone number corresponding to each identification code are assigned to one identification code of the terminal device. A plurality of telephone numbers are registered in a registration unit that can register, and the host computer compares the caller number notified from the caller number detection notification unit with each telephone number registered in the registration unit. Then, a determination procedure for determining whether or not there is a matching number and a communication control procedure for controlling communication via the caller number detection notification means according to the determination result are executed, and the communication control Regardless of the determination result in the determination procedure, the procedure starts communication with the terminal device that requested communication by connecting to the telephone line via the caller number detection notification means, and the caller number detection notification means If it is determined in the determination procedure that the caller number notified from does not match any of the telephone numbers registered in the registration means, the identification code transmitted from the terminal device is And checking whether the identification code matches any of the identification codes registered in the registration means. If they match, the communication with the terminal device is continued. Including a procedure for canceling connection with a telephone line, when the identification code acquired from the terminal device matches any of the identification codes registered in the registration means, the caller ID detection notification The procedure for newly registering the caller number notified from the means as the telephone number corresponding to the matched identification code while leaving the previously registered number in the registration means is executed.

  According to the data communication system of the present invention, in a data communication system composed of a host computer connected via a telephone line and a large number of terminal devices, the host computer can recognize changes in the operating environment on the terminal device side. Even when the system environment is changed, the connectivity between the host computer and the terminal device can be continuously secured.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of a data communication system according to the present invention. As shown in the figure, the data communication system according to the present invention includes a telephone line 50 including a telephone switching network 51 for providing a service for notifying a number of terminal devices 100 and a caller number detection notifying means 200. And a host computer 300 is connected to the caller ID detection notifying means 200 via a modem (modem) 250.
Caller number detection notifying means 200 and host computer 300 are also connected by a control line 210. In this example, an external system 400 is also connected to the host computer 300.

  Each terminal device 100 is a terminal device having a communication function that is located in a remote place as viewed from the host computer 300. As shown in FIG. 2, the terminal device 100 stores an input / output unit 101 for performing operation input and display of data, an adding unit 102, and an identification code for distinguishing from other terminal devices. Means 103 and transmission control means 104 for controlling line connection operation with the telephone line 50 and transmission / reception of information to / from the host computer 300 are provided.

  Each terminal device 100 has a function of transmitting and receiving necessary information in a system (management system) managed on the illustrated data communication system. That is, the information input by the input / output unit 101 is transmitted to the host computer 300 via the telephone line 50 by operating the transmission control unit 104, or the information from the host computer 300 is received and the information is received. Can be displayed on the display unit of the input / output unit 101 or stored in the storage unit 103. Each of these terminal devices 100 can read and write information with each other through transmission and reception with the host computer 300.

  The adding means 102 instructs the transmission control means 104 in accordance with the operation input of the input / output means 101, and makes the caller number notification valid for its own telephone number (also called the caller number) used by each terminal device 100. This is a means for adding a number (hereinafter referred to as “instruction number”) to transmit to the telephone line 50. Further, the adding means 102 is provided with a switching means 102a for selectively switching by the input / output means 101 whether or not to add the instruction number to the caller number.

  Returning to FIG. 1, caller number detection notifying means 200 (hereinafter simply referred to as “detection notifying means 200”) detects the caller number of terminal device 100 making a communication request notified through telephone line 50. In addition to notifying the host computer 300, connection and disconnection of the telephone line 50 and the host computer 300 are controlled, and the received data is demodulated through the modem 250 and sent to the host computer 300. Further, the data transmitted from the host computer 300 and modulated through the modem is sent to the telephone line 50.

  The caller ID notification service is a service provided to a subscriber by a business entity that installs a telephone line 50 including the telephone switching network 51 or borrows and provides a telecommunication service. This service notifies the receiving side of the caller ID (caller's phone number) when a call is made from a telephone line that is set to enable notification of the caller ID.

  The modem 250 is a device that performs data communication using the telephone line 50 and is connected between the detection notification means 200 and the host computer 300. The host computer 300 exchanges data with each terminal device 100. A signal (data) modulation / demodulation process is executed so that transmission is possible.

  As shown in FIG. 3, the host computer 300 includes a registration unit 301, a storage unit 302, an operation input display unit 303, a CPU 304, a ROM 305, a RAM 306, and a communication control unit 307. Is connected.

  The registration means 301 registers each identification code of all terminal devices 100 scheduled to communicate with the host computer 300 through the telephone line 50 in correspondence with the caller number of each terminal device. The registration is performed by being stored in the storage unit 302. When the terminal device 100 can be connected to a plurality of lines having different telephone numbers (when using an extension telephone that can be connected to a plurality of external lines), a plurality of identification codes for the terminal device are used. Enable phone number registration.

  The storage means 302 is constituted by a storage device such as a hard disk, and is generated along with the permanent data and processing necessary for caller number processing in addition to the identification code of each terminal device and the corresponding telephone number. Information, various management information related to each terminal device 100, information related to the user, and the like can be stored.

  The operation input display unit 303 includes an input unit for an operator to input information and a display unit for displaying information. The input unit includes information to be registered in the registration unit 301 by using a keyboard or a mouse, information for operating a document creation / editing or other application program realized by the CPU 304, and operation information for operating the registration unit 301. Enter. The display unit is composed of an LCD or the like, and displays information input by an input operation of the input unit, an operation state of the host computer 300, operation guidance information, and the like.

The CPU 304 is a central processing unit that controls the entire host computer 300. The CPU 304 constitutes a microcomputer together with the ROM 305 and the RAM 306, and executes processing as discrimination means according to the present invention and other processing according to a program stored in the ROM 305. To do.
The ROM 305 is a program memory that stores programs executed by the CPU 304 and permanent data, and the RAM 306 stores information necessary for execution by the CPU, temporary data during a process execution operation, and the like.

  The communication control unit 307 controls data communication processing performed with the detection notification unit 200 illustrated in FIG. 1 according to a communication protocol. That is, the communication control unit 307 receives a command from the CPU 304, controls the line connection operation with the telephone line 50 via the modem 250 and the detection notification unit 200, and connects the host computer 300 and the terminal device 100.

Next, the operation content of the data communication system having the above configuration will be specifically described.
First, it is assumed that any of the terminal devices 100 shown in FIG. 1 needs to communicate with the host computer 300. In that case, when there is an operation input from the input / output unit 101, the terminal unit 100 transmits the additional unit 102 regardless of whether or not the connected telephone line 50 can provide a caller ID notification service. An instruction is sent to the control means 104. Then, the transmission control means 104 sends a number (additional caller number) with an instruction number added to the head of the caller number to the telephone line 50 and calls the host computer 300 via the telephone exchange network 51 to make a call. .

  On the other hand, when the additional caller number is transmitted from the terminal device 100, the telephone exchange network 51 transmits the caller number to the detection notification means 200 side. Then, the detection notification means 200 receives it, detects the caller number, and notifies the host computer 300 through the control line 210.

When the host computer 300 receives the caller number by the communication control means 307 shown in FIG. 3, it sends it to the CPU 304. Then, the CPU 304 executes the following processing according to the flowchart shown in FIG. In this flowchart, step is abbreviated as “S”.
First, in step 1, the telephone number registered in the registration means 301 is searched, and in the subsequent step 2, the notified caller number is compared with the searched telephone number, that is, there is a matching number, that is, the call origination. It is determined whether or not a person number is registered.

  If it is determined that there is a matching number, the process proceeds to step 3. If it is determined that there is no matching number, a notification for permitting line connection is received from the terminal device in which the identification code is registered. Since it is not a communication request, the process proceeds to step 4 to operate the communication control unit 307 so as to send a notification not permitting connection of the line to the detection notification unit 200.

  When the connection permission is notified in step 3, the detection notification means 200 connects the host computer 300 to the telephone line 50, and in the next step 5, the communication control is performed so that the detection notification means 200 continues the line connection operation. The means 307 is operated.

  From step 4, the process proceeds to step 6, and predetermined information indicating that the caller number is not registered (for example, the unregistered caller number and message information indicating that the caller number is not registered) is displayed as an operation input. This is displayed on the part 303. In this case, the predetermined information may be notified from the communication control unit 307 to the external system 400, printed on a sheet by a printer (not shown), or may be stored in the storage unit 302.

  Further, in the subsequent step 7, the unregistered caller number is newly registered in the registration means 301 and the process proceeds to step 8. In step 8, the detection notification means 200 is rejected and the subsequent connection operation is stopped. Thus, the communication control means 307 is operated. Accordingly, the identification number is received from the terminal device that has made the connection request, and it is not determined whether or not it is registered, and data communication is not performed.

  As described above, the host computer 300 determines whether or not the terminal device identification code is registered by the search based on the caller number notified from the detection notification means 200 when a connection request is received from the terminal device 100. It is possible to connect the line after confirming whether the other party is a legitimate terminal device.

  In general, methods for confirming the validity of the other party in such a data communication system include: a) whether a call can be received; There are (hierarchical) levels (levels), and the hierarchical level increases in the order of a), b) and c). Therefore, using the caller ID notified as a service from the telephone line as in the present invention, when determining the appropriateness of the other party when deciding whether to accept the incoming call, the hierarchy is low and the confirmation is made at an early stage. It becomes possible to reject incoming calls (line connections).

  In addition, since it is confirmed whether or not the identification code of the terminal device 100 has been registered based on the caller number that is a telephone number, even if the telephone number to be used is changed, the changed telephone number is stored in the terminal device. If registered in correspondence with the identification code, the line can be connected as a regular terminal device even if the system environment such as a telephone number is changed. Therefore, the connectivity between the terminal device 100 and the host computer 300 can be continuously secured.

  Then, in step 6 of FIG. 4, when the caller ID of the terminal device requested to connect to the host computer 300 is not registered, predetermined information is displayed. When it is confirmed that the terminal device is authentic, subsequent actions such as registering an unregistered caller number by an operation input of the operation input display unit 303 can be easily performed. Further, since the unregistered caller ID is automatically registered in step 7, it becomes easy to confirm the terminal device that has made a subsequent connection request.

Note that both Step 6 and Step 7 may be omitted, or only one of them may be performed.
Furthermore, if the caller ID of the terminal device that requested the connection is unregistered, the line connection operation is canceled without determining whether the identification code is registered, so communication is scheduled. Unauthorized access from a terminal device that has not been performed can be reliably prevented.

  On the other hand, the adding means 102 of the terminal device 100 shown in FIG. 2 is provided with switching means 102a for selectively switching whether or not to add an instruction number to the caller number. Therefore, as described above, whether to add an instruction number when making a call from the terminal device 100 or whether to make a call without adding an instruction number can be switched as necessary.

  By the way, the telephone line 50 to which the terminal device 100 is connected is shared not only with the telephone but also with a facsimile machine or the like, and the caller ID notification service is not always used. In such a case, when the telephone line 50 is another person's line, it is left to the subscriber of the telephone line 50 whether or not the caller number notification service can be used. Not always available.

  However, when the switching unit 102a is provided, for example, in normal communication such as facsimile communication, communication is performed without adding an instruction number, and the switching unit 102a is switched as necessary or periodically. You can make a call by adding a number. In this way, the notification of the caller ID is limited to the case of performing communication according to the present invention, and by not making it in other communication, the inconvenience caused by always notifying the other party of the caller ID notification can be prevented. it can.

  Further, even if there is a line that does not use the caller ID notification service in the entire system including each terminal apparatus 100, communication from the line is also required by providing the switching means 102a in each terminal apparatus 100. The caller ID will be used according to the request. As a result, the connectivity of the entire system can be ensured.

  On the other hand, the registration means 301 can register a plurality of telephone numbers for one identification code. Therefore, even when it is assumed that the terminal device 100 requests connection of a line by any of a plurality of telephone numbers (caller numbers), if the plurality of telephone numbers are registered, Even a number can be determined to be a legitimate partner and a line can be connected.

  For example, in a factory or office, the telephone line 50 can be communicated by arranging a large number of extension telephones along with the PBX on the premises and connecting each of the extension telephones to one of a plurality of telephone lines (external lines) via the PBX. In some cases, a terminal device is connected to the extension.

  At this time, when a connection request is made from the terminal device connected to the extension to the host computer 300, an unused line is allocated among a plurality of lines, and therefore the telephone number varies without being constant. In such a case, if all the telephone numbers that can be used for the identification code of each terminal device are registered on the host computer 300 side, the legitimate terminal device can accept calls from any line. It becomes possible to determine that there is a connection.

In the above description, when the caller ID of the terminal device that requested connection to the host computer 300 is not registered, the line connection is refused and data communication with the terminal device 100 is not performed. Explained.
Next, even when the caller ID of the terminal device 100 that has requested connection to the host computer 300 is not registered, the operation when the line is connected to communicate with the terminal device 100 is shown in FIG. It demonstrates according to a flowchart. Also in this flowchart, the step is abbreviated as “S”.

  Also in this case, as in the case described above with reference to FIG. 4, when the CPU 304 shown in FIG. 3 receives the caller number from the communication control means 307, the processing shown in the flowchart of FIG.

First, the telephone number registered in the registration means 301 in step 1 is searched, and in step 2, it is determined whether there is a matching number.
If there is a matching number, the process proceeds to step 3; if there is no matching number, the process proceeds to step 10. In either case, the communication control unit 307 is set so as to notify the detection notification unit 200 of connection permission. Make it work. Accordingly, the detection notification unit 200 performs an operation of connecting the host computer 300 to the telephone line 50.

  After step 3, the process proceeds to step 5, where the communication control unit 307 is operated so that the detection notification unit 200 continues the line connection operation so that data communication with the connected terminal device 100 can be performed. In step 17, the final confirmation history of the caller ID is stored in the storage means 302, and this process is terminated.

On the other hand, after step 10, the process proceeds to step 11 where the identification code is acquired by communication with the terminal device 100 and the identification code registered in the registration unit 301 is searched. In step 12, it is determined whether or not any of the acquired identification code and the registered identification code match.
As a result, if they coincide with each other, the process proceeds to step 13, and the communication control unit 307 is operated so that the detection notification unit 200 continues the line connection operation, so that data communication can be performed with the terminal device 100 that has made the connection request.

  Then, the process proceeds to step 16, and the caller number notified from the detection notification unit 200 is newly registered in the registration unit 301 as the telephone number corresponding to the identification code matched in step 12, or the telephone number previously registered Instead of change registration. Thereafter, in step 17, the caller number and the final confirmation history of the identification code are stored in the storage means 302, and this process is terminated.

  If it is determined in step 12 that the acquired identification code does not match any of the registered identification codes, the process proceeds to step 14 to display a predetermined display for notifying on the operation input display unit 303. . In this case, the predetermined information may be notified from the communication control unit 307 to the external system 400, printed on a sheet by a printer (not shown), or may be stored in the storage unit 302.

  Next, in step 15, the communication control unit 307 is operated so that the detection notification unit 200 stops the line connection operation, and data communication with the terminal device 100 is not performed. In step 17, the unregistered identification code and caller number are stored in the storage means 302 as a final confirmation history, and the process is terminated.

In this way, after establishing a line connection with the terminal device 100 that has made a connection request, if the caller ID is not registered prior to data communication with the terminal device 100, an identification code is acquired. If it is confirmed whether it is registered or not, even if the telephone number is different from the registered telephone number due to the transfer of the terminal device 100 or the change of the line to be used, If the identification code is registered, the line can be connected.
Since data communication is performed after confirming whether or not the identification code is registered, communication can be performed only with an authorized terminal device, and access from an unauthorized terminal device is eliminated.

  In this case, by registering the caller number that has not been registered in step 16 as a telephone number corresponding to the matched identification code, when there is a subsequent connection request from the same terminal device, the detection notification means 200. Since the caller number notified from the terminal is registered in the host computer 300, the line connection can be continued without confirming the identification code, and the data communication can be started.

  If neither the caller number notified from the detection notifying means 200 nor the identification code acquired after the line connection is registered, predetermined information notifying that is displayed or printed at step 14. Since it is output, it is easy to handle afterwards, such as when checking the terminal device separately.

  Further, by storing the final history when the caller ID and the identification code are confirmed (in the case of coincidence or non-coincidence) in step 17, the history information is read from the storage means 302 later, and the operation input display unit The information can be displayed on the screen 303, printed on a sheet by a printer (not shown), and output.

As a result, it becomes easy to confirm the change of the telephone number, the unregistered terminal device for which a connection request has been made, and the like. In that case, it is possible to make a connection request from the host computer to the terminal device.
In addition, it is possible to grasp the status of changes in the system environment from the entire system. In addition, when any trouble occurs, it is possible to respond quickly by analyzing the final history information.

  As described above, the data communication system according to the present invention uses the service for notifying the caller number of the telephone line, and the partner computer is notified by the caller number notified when the host computer requests connection from the terminal device. It is possible to check at an early stage because it is confirmed whether or not the terminal is a legitimate terminal device, and if it cannot be confirmed as a legitimate terminal device, the connection of the line can be rejected. Become.

  If the caller ID is not registered in the host computer, the line with the terminal device is once connected to obtain the identification code. If the identification code is registered, the line connection is continued. If data communication is started, data communication can be performed even when the telephone number used by the legitimate terminal device is changed. If the changed telephone number is registered corresponding to the registered identification code, the line can be connected as a regular terminal device even if the system environment such as the telephone number changes. The connectivity between the terminal device and the host computer can be continuously secured.

It is a block diagram which shows the whole structure of one Embodiment of the data communication system by this invention. It is a block diagram which shows the internal structure of the terminal device in FIG. It is a block diagram which shows the internal structure of the host computer in FIG. It is a flowchart which shows an example of the process which concerns on this invention in a host computer. It is a flowchart which similarly shows the other example of the process concerning this invention in a host computer.

Explanation of symbols

50: Telephone line 51: Telephone switching network 100: Terminal device 101: Input / output means 102: Additional means 102a: Switching means 103: Storage means 104: Transmission control means 200: Caller number detection notification means 250: Modulator / demodulator (modem)
300: Host computer 301: Registration unit 302: Storage unit 303: Operation input display unit 304: CPU
305: ROM 306: RAM
307: Communication control means 400: External system

Claims (5)

A plurality of terminal devices connected to a telephone line including a telephone exchange network that provides a service for notifying a caller number, and a call that is connected to the telephone line and detects and notifies the caller number notified from the telephone line A data communication system comprising a party number detection notification means and a host computer connected to the telephone line and performing data communication with the terminal device after receiving notification of the caller number detected from the means,
In each terminal device,
An identification code for distinguishing from other terminal devices,
Prior to data communication with the host computer, a means for transmitting its own identification code is provided,
In the host computer,
A means for registering each identification code of the plurality of terminal devices constituting the system and a telephone number corresponding to each identification code, wherein a plurality of telephone numbers are registered for one identification code of the terminal device. A registration means that is obtained;
A determination unit that compares the caller number notified from the caller number detection notification unit with each telephone number registered in the registration unit to determine whether there is a matching number;
Communication control means for controlling communication via the caller number detection notification means according to the determination result;
Regardless of the discrimination result by the discrimination means, the caller number detection notification means is connected to the telephone line to start communication with the terminal device that requested the communication, and is notified from the caller number detection notification means. If the determination means determines that the caller number does not match any of the telephone numbers registered in the registration means, an identification code transmitted from the terminal device is obtained, and the identification code is Check whether it matches any of the identification codes registered in the registration means. If they match, the communication with the terminal device is continued. If they do not match, the connection with the telephone line is stopped. Means for operating the communication control means;
When the identification code acquired from the terminal device matches any of the identification codes registered in the registration means, the caller number notified from the caller number detection notification means is replaced with the telephone number corresponding to the matched identification code. And a means for newly registering the registration means while leaving a previously registered number . The data communication system according to claim 1, wherein
When the identification code acquired from the terminal device does not match any of the identification codes registered in the registration means, the host computer displays it, prints it out, or notifies the outside Or a data communication system comprising means for recording.   The determination means of the host computer, when the caller number notified from the caller number detection notification means matches one of one or more telephone numbers for the identification code registered in the registration means, 3. The data communication system according to claim 1, wherein the data communication system is means for determining that the request is a communication request from a terminal device in which an identification code is registered. The data communication system according to any one of claims 1 to 3,
The data communication system characterized in that the host computer has means for storing a caller number notified from the caller number detection notification means and information on a final confirmation history of an identification code acquired from the terminal device. Connected to a telephone line including a telephone exchange network that provides a service for notifying a caller number via a caller number detection notification means for detecting and notifying a caller number notified from the telephone line, and from the means A communication control method in a host computer connected to the telephone line and performing data communication with a terminal device connected to the telephone line after receiving notification of the detected caller number,
The terminal device is a device having an identification code for distinguishing from other terminal devices, and means for transmitting its own identification code prior to data communication with the host computer,
In the host computer, registration that can register a plurality of telephone numbers for one identification code of the terminal device, and each identification code of a terminal device that is a proper communication partner and a telephone number corresponding to each identification code Register with the means,
In the host computer,
A determination procedure for comparing the caller number notified from the caller number detection notification means and each telephone number registered in the registration means to determine whether there is a matching number;
A communication control procedure for controlling communication via the caller number detection notification means according to the determination result;
Regardless of the determination result in the determination procedure, the communication control procedure is connected to a telephone line via the caller number detection notification means and starts communication with a terminal device that has requested communication, and the caller ID If the determination procedure determines that the caller number notified from the detection notification means does not match any of the telephone numbers registered in the registration means, an identification code transmitted from the terminal device is acquired. Then, it is checked whether the identification code matches any of the identification codes registered in the registration means. If they match, the communication with the terminal device is continued, and if they do not match, the telephone Including the procedure to stop the connection with the line,
Further, when the identification code acquired from the terminal device matches any of the identification codes registered in the registration means, the caller number notified from the caller number detection notification means matches the host computer. A communication control method characterized by causing a new registration procedure to be executed while leaving a previously registered number in the registration means as a telephone number for the identification code.

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