JPH04150544A - Terminal adapter - Google Patents

Abstract

PURPOSE:To improve the degree of freedom of a termination response as keeping a security function by making communication possible by making forcedly respond to an incoming call in response to the operation of an operator when the incoming call with no registered origination address is received. CONSTITUTION:The information of a subscriber to be permitted to terminate is held beforehand in a storage means 119 for the sake of security, and at the time of call incoming, a comparing means 112 compares the subscriber information of a call originating side received from a network side with this held information of the storage means 119, and if they coincide with each other, it permits call termination, and if they do not coincide, it generates an alarm signal. Then, on the occurrence of the alarm signal, if the command of forced termination is given from an input means 125, a call termination control means 112 permits the call termination, and makes the communication between a calling terminal and the connection terminal of a terminal adapter possible. Thus, the degree of freedom of the termination response is improved as keeping the security function.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a terminal adapter connected to a subscriber premises bus of an integrated service digital network.

(Prior Art) In recent years, with the advancement of communication technology and the diversification of communication forms, various communication network systems have been developed.
egrated 5 services Digital
There is a digital public network called ``Network''. This 15DN is a system that digitizes everything from the switching system to the subscriber transmission system, thereby providing high quality and diverse services to subscribers.For example, existing telephone subscriber lines (2-wire metallic ), the basic interface uses 64kbp on one subscriber line.
s line (B channel) and 1Bkbps line (
D channel) can be multiplexed between the subscriber terminal and the I5DN switch.

In this way, the L5DN provides telephone, data, facsimile communications, and various communication processing services in a digital communication line, and a communication system using the L5DN is configured as shown in FIG. 9, for example. That is, this system has a digital communication line switch 14 to which a digital line switching network 11, a packet switching network 12, a public telephone network 13, etc. are connected, and a subscriber line 9 is connected to the digital communication line switch 14. The network terminal device 8 is connected to a network terminal device 8 in the user's home, and the network terminal device 8 is connected to a home bus 10 in the user's home, and the home bus 10 is equipped with existing telephone devices, facsimile devices, voice mail devices, printing devices, personal computers, etc. A communication terminal device 6 is connected.

Then, a plurality of communication channels are selectively used for each subscriber line 9 to perform desired communication between communication terminal devices. For example, for a basic interface with a transmission rate of 192 bits/second, two B channels at 64 bits/second and one D channel at 16 bits/second are time-division multiplexed, and these channels are used to transmit data. etc. will be transmitted.

A terminal adapter device called a terminal adapter (TA) is a terminal connected to the home bus IO in such a line. This TA is an adapter that enables existing communication terminal equipment that does not have a communication control function, etc., to connect to an I5DN line and use the D channel communication protocol, which is a communication protocol for the I5DN user/network interface. existing terminal interfaces, and one of these existing terminal interfaces can be
By matching the data communication speed and converting the communication protocol for one channel of the line, the existing terminal connected to the existing terminal interface can be connected to the I5DN line and used for communication.

The basic interface of 15DN is designed to allow up to 8 communication terminals to be connected to a private bus, and in addition to the subscriber telephone number for that line, each terminal has a sub-address set by the user. By calling the sub-address, you can have the call arrive at the communication terminal specified by that sub-address.

FIG. 10 is a block diagram showing an example of the configuration of a conventional terminal adapter, in which 1 is the terminal adapter body, 2 is a CPU (CPU), 3 is an existing terminal interface, 4 is an 15DN line interface, and 5 is a terminal adapter.
is a memory, 6 is an existing terminal, 7 is a printing device, 8 is a network termination device, and 9 is a digital subscriber line.

In the case of a basic interface, the digital subscriber line 9 is configured with two B channels of B4k bps and one D channel of IBk bps.

The existing terminal interface 3 is connected to the CPU node and is used to send and receive data to and from the existing terminal.

For example, if the existing terminal has an R8232C standard interface as a communication interface, the existing terminal interface 3 may be the well-known USART (Llniv
ersal 5 synchronus/Asynchronous
nous ReceiverTrans+gitter
In the case of a printer, it is constructed from an integrated circuit element such as a well-known PIO (Peripheral Input/Output Circuit).

! SDN line interface 7x-4 is LISAART and l
It consists of 5 ICs (S point interface; 8 points refer to access points in service) for 5DN. This 810 is a circuit element that includes, for example, a parallel boat and two 64k 1aps serial ports, and the parallel boat transmits and receives a D channel signal, and the serial boat transmits and receives a B channel signal.

When making a call to the 15DN, the CPU 2 writes necessary data (telephone number, etc.) to the parallel port (Dch) of the SIC. When sending data from an existing terminal to the line, write the data to tlsART, and from USART to SI
Sent to C's serial boat.

The memory 5 includes a data buffer for transmitting and receiving data, and a C
Execution programs etc. of PU 2 are stored, and CPt
Reference numeral 12 controls the entire system. Also, C
When the PU 2 receives a call from a terminal, it waits for dial input information from that terminal, and when it receives the dial input information, it sends it to the subscriber line 9, which is a central office line, via the ISDN line interface 4, and connects it to the 15DN network. send to In the 15DN network, a call is made to the called party based on this information, but at this time, the network side collects the calling party's information, including the data communication parameters of the calling terminal, the calling party's address, etc., the called party's information, etc. ,
A call setup message containing necessary information in a predetermined format is transmitted to the destination. Therefore, when a call arrives from the 15DN network via the ISDN line interface 4, a call setup message is received, and if there is a subaddress in the call setup message, the CPt12 of the terminal adapter directs the call to the existing terminal corresponding to the subaddress. Hopefully,
If there is no subaddress, processing is performed in accordance with the communication parameters of each existing terminal, and the call is received at each existing terminal.

In this way, the terminal adapter 1 described above performs normal IS communication between an existing terminal connected to its built-in existing terminal interface and a partner terminal connected to the 15DN network.
It is capable of communicating in accordance with the DN system. Furthermore, some terminal adapters 1 are built into existing terminals, thereby making it possible to use existing terminals that are not for 15DN as terminals for 15DN. In any case, this terminal adapter is inserted between an existing terminal and the Integrated Services Digital Network (ISDN), and by converting the interface between the terminal and the ISDN, data can be exchanged between the terminal and the ISDN. It is something to do.

By the way, the conventional l5DN terminal adapter (TA
), in order to restrict incoming calls for security purposes, the calling address, which is a list of parties to whom communication is permitted, is registered in a list, and when a call is received! Check whether the calling address of the calling terminal is registered in the calling address list by referring to the calling address (subscriber number of the calling terminal) included in the call setup message sent from the SDN network side. Some devices have a security function that allows incoming calls to be answered only if there is a match, and if there is no match, the call is left in a non-response state.

In such a configuration, if the called address is not present in the calling address list registered in the called terminal adapter, or because the calling terminal selects Even if the calling address information was not transmitted, there was a problem in that during a strike to dispute the registered calling address, the incoming call would not be answered as it was deemed not applicable.

(Problem to be Solved by the Invention) A terminal adapter performs communication based on the normal ISDN method between an existing terminal connected to its built-in existing terminal interface and a partner terminal connected to an SDN network. It is something that can be done.

Furthermore, some terminal adapters are built into existing terminals, thereby making it possible to use existing terminals that are not for 15DN as terminals for 15DN. In any case, this terminal adapter is inserted between the existing terminal and the LSDN network, and the terminal adapter and the LSDN network are connected to each other.
By performing interface conversion between DNs, it is possible to exchange data between the terminal and the 15DN.

By the way, in conventional ISDN terminal adapters, in order to restrict incoming calls for security reasons,
Register the calling address, which is a list of parties with whom communication is permitted, in the list, and refer to the calling address (subscriber number of the calling terminal) included in the call setup message sent from the ISDN network when a call is received. Check whether the originating address of this calling side terminal is registered in the originating address list, and only if it matches, will it be possible to respond to the incoming call, and if there is no match, will it be left in a non-responsive state? Some devices have security functions such as executing a disconnection procedure.

In other words, when a call arrives, the calling terminal receives a call setup message transmitted from the network side, searches for the calling address list of the calling terminal prepared in advance in the terminal adapter, and then selects the calling terminal. A search is made to see if there is a match to the originating address, and if there is a match, a response is returned to the network side, and for the existing terminal connected after the terminal adapter, it is treated as if it were receiving on a dedicated line. , was configured to work. In addition, if they do not match, for security reasons, this function either leaves the incoming call in a non-responsive state or executes a disconnection procedure.

With such a security function, if the calling party's address is not present in the calling party's address list registered in the calling party's terminal adapter, or if the calling party's terminal is Even if the calling address is not transmitted due to the selection of I had a problem where I couldn't get a response.

Therefore, if there is a new party whose calling address has not been registered or if the calling party's address information is not transmitted from the network due to the selection of the calling terminal, communication will not be possible, which is a problem even though it is for security reasons. . Even if the terminal adapter comes with operation keys that allow you to set memory data, etc.
Even if it is possible to add or correct caller address information using this key operation, registering a caller address is not easy or easy for anyone to do, and requires a certain degree of specialized knowledge. , - This is difficult to deal with when it becomes necessary to overtrust an unregistered terminal.

Furthermore, terminal adapters with security functions send information about conditions on the calling side, such as communication parameters, via the network, so compare this information with the settings on the own side. Some devices check whether communication is possible, but in this case, even if the call is received from the calling party registered in the calling address list, conditions such as overcall parameters etc. Even if there were some discrepancies with that of the above, there was a problem that communication could not be established as a result of the inconsistency.

Therefore, the purpose of this invention is to provide security that registers the calling address and controls the response to the call by comparing the calling address information in the call setup message sent from the network side when a call is received. When a terminal adapter with this function receives an incoming call that does not have a registered calling address or there is a mismatch in the communication condition settings, it will notify you and respond to the operator's instructions. To provide a terminal adapter which enables communication by forcibly responding to an incoming call, thereby improving the degree of freedom in responding to an incoming call while maintaining a security function.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, first, when a call is received, the network side sends out information including subscriber information of the calling side, and the called side is connected to a digital public network that allows the called side to receive this information. In a terminal adapter that converts a terminal device that does not conform to the interface standard of the digital public network to conform to the interface standard of this digital public network, a storage means for pre-holding information of subscribers who are permitted to receive calls, and for giving commands. The system compares the subscriber information of the calling side received from the network side at the time of an incoming call with the information held in this storage means, and if the input means agrees, the incoming call is permitted, and if there is a mismatch, an alarm signal is generated. and a call control means for permitting an incoming call when a forced incoming call is commanded from the input means when an alarm signal is generated.

Second, when a call arrives, the network side sends out information including the calling party's subscriber information and communication condition parameters, so that the called party can check this information. storage means for pre-holding information on permitted subscribers and communication condition parameters of the connected terminal; input means for giving commands; display means for displaying information; The subscriber information and communication condition parameters of the calling party are compared with the information held in this storage means,
a comparison means for permitting an incoming call when they match and generating an alarm signal when they do not match; and a display function means for displaying alarm contents on the display means based on the comparison result of the comparison means when an alarm signal is generated. When an alarm signal is generated, if a forced incoming call is commanded from the input means, the incoming call is permitted, and if the parameters do not match, the parameters are reset to match those of the calling party, and then the incoming call is allowed. and an incoming call control means for permitting incoming calls.

(Function) In the case of the first configuration of this device having such a configuration, the storage means stores in advance information of subscribers who permit incoming calls for security purposes, and the comparison means stores information on subscribers who permit incoming calls in advance for security purposes. The calling side subscriber information received from the network side is compared with the information held in this storage means, and if they match, the incoming call is permitted, and if they do not match, an alarm signal is generated. When an alarm signal is generated, when a forced call is commanded by the input means, the call control means permits the call and enables communication between the calling terminal and the terminal connected to the terminal adapter.

In the case of the second configuration, the storage means stores in advance the information of the subscriber who permits incoming calls and the communication condition parameters of the connected terminal, and the comparison means stores the outgoing calls received from the network side at the time of the incoming call. The calling side subscriber information and communication condition parameters are compared with the information held in the storage means, and if they match, the incoming call is permitted, and if they do not match, an alarm signal is generated. When an alarm signal is generated, the display function means displays the content of the alarm based on the comparison result by the comparison means on the display means. The operator knows from these that there is an incoming call that does not meet the conditions, and if communication is to be permitted depending on the content, he or she instructs forced incoming call through the input means. As a result, the incoming call control means allows the incoming call as is if the subscriber is not registered for incoming call permission, and if the parameters do not match, the incoming call control means resets the parameters to match the calling party. , then allow incoming calls.

In this way, even in the case of an incoming call that does not meet the conditions, it is possible to notify that the incoming call is unsuitable and to force the call to arrive through the operation of the operator on the called side, allowing overconfidence. .

Therefore, according to the present invention, the calling address, which is the subscriber number of the calling party that is permitted to receive the call, and the parameter information of the communication conditions, etc., are registered, and when the call is received, the call setting is sent from the network side. Incoming calls that do not have a registered calling address are handled by terminal adapters that have a security function that verifies the calling address information in the message or checks the integrity of parameter information and controls the incoming call response if communication is possible. If the communication parameters do not match, the system notifies you of the incoming call so that you can see this, and also forces the operator to answer the call according to the operator's operation. By modifying the communication parameters of the terminal warping adapter and the connected terminal, we are able to forcibly respond to incoming calls and communicate, thereby providing a terminal adapter that improves the flexibility of responding to incoming calls while maintaining security functions. can do.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 103 is a digital communication network subscriber line in-home bus, and 11 ports are network interface units, and this network interface unit 110 is The digital signals transmitted and received via the digital communication network subscriber line in-house bus 103 are
It decomposes a channel (information channel) and a D channel (signal channel), or assembles a digital signal from a B channel and a D channel. 114
is a data communication speed matching unit that matches the data communication speed between the network side and the terminal side, and the network interface unit 1
10 and the data overspeed matching section 114 are connected via B channel switches 113a and ll'lb. B
The channel switch 113a is an open/close switch for the receiving line, and the B channel switch 113b is an open/close switch for the transmitting line, and the opening/closing of each is controlled by the signal control unit 112.

The network interface unit 110 receives the B channel signal from this B channel.
Transmission and reception is performed with the data communication speed matching unit 114 via the channel switches 113a and 1L3b, and the D channel is transmitted and received with the signal control unit 1112.

Reference numeral 117 denotes an external terminal interface section that serves as an interface for connecting an existing terminal device and transmitting and receiving signals. It is connected to the terminal serial communication section 115. In addition, changeover switches 118a and 116b
is one of the external terminal serial communication section 115 and the data communication speed matching section 114, and the external terminal interface section 11.
7, and is a switch for connecting the signal control unit 11
2, and by switching this switch, the external terminal interface section 117
can communicate with either the external terminal serial communication section 115 or the data communication speed matching section 114.

The external terminal serial communication unit 115 is for exchanging data with an existing terminal connected to the external terminal interface 117.
It is possible to send various signals and information to existing terminals, and to receive various signals and information from existing terminals.

Further, the signal control unit 112 plays a central role in controlling the entire terminal attacher, and includes a switch 113a, an IL
3b, data overspeed matching unit 114, external terminal serial communication unit 115, and display unit 11g, and controls these. In addition, the key human power section 125 is connected to the signal control section 112, and the key human power section 125 is connected to the signal control section 112 to transmit instructions by the operator's key power to the signal control section 112.
Furthermore, a storage unit 119 is connected to the signal control unit 112 and stores the originating address, various overconfidence parameters, and the like. The display section 118 displays various information under the control of the signal control section 112.

Next, Fig. 2 shows a terminal using the terminal adapter of the present invention.
The schematic configuration of a 5DN network is shown in a block diagram.

In the figure, one system of digital communication network subscriber line in-house bus 1
03 and the terminal-adapter 100 of the present invention and other terminal-adapters 201 and the existing data terminal 151
, 152 and the 15DN exchange 102 are shown connected.

Here, the digital communication network subscriber line in-house bus IH has 6
Two 4Kbps (bit/5econd) B channels (information channels) and 18Kbps D channels (signal channels) are time-division multiplexed via the network interface unit and connected to the network termination device 104 and the 1G 15DN switch.
It is sent and received via 2.

FIG. 3 shows the bit structure of one frame on the reception line (R line) and transmission line (T line) of the digital communication network subscriber line home bus 103.

FIG. 14 shows the configuration of the signal control unit 112, which includes a communication protocol control unit 220, a serial data communication path control unit 22I, a speed matching control unit 222, an external terminal overconfidence control unit 223, a key input unit control unit 224, and a display device. It has various functional means such as a control means 225, a call control means 226, a calling address check means 227, and a communication possibility control means 228, and performs various controls by executing these means. The signal control unit 112 is composed of a processor circuit network, and these functions are executed by software of the processor circuit network.

Among these, the communication protocol control means 220 controls the communication protocol between the network interface section 110 and the signal control section 112 using the D channel.
The serial data communication path control means 221 is a changeover switch f.
lea, 118b and B channel switch 113a,
11(b), and the speed matching control means 222 is used to issue control commands to the speed matching section 114. Also, the external terminal communication control means 223 controls the external terminal serial communication section 115. The key input section control means 224 is for detecting the operation of the key input section 125 and obtaining the code of the operated key, and the key input section control means 224 is for controlling the display. Means 225
is for controlling the display of the display device l18. Further, the call control means 22B is for generating a warning sound, and the calling address checking means 227 extracts the calling address from the received call setting message and compares this with a pre-registered calling address. The communication possibility control means 228 checks the communication setting conditions such as overconfidence parameters obtained from the received call setting message and determines the communication parameters of the existing terminal device connected to its own terminal adapter. This is a determination function that checks whether or not the setting conditions for communication match, such as, and notifies that communication is possible if the conditions match.

Note that the warning sound is generated by providing a speaker in the terminal adapter, but if the terminal has a sound source or speaker, it may be used. When using the sound source or speaker on the terminal side, it is possible to do so by transmitting an instruction to the terminal side via the external terminal serial communication section 115.

FIG. 5 shows a calling terminal, 15DN, in accordance with the above protocol regarding call origination, call termination, and call disconnection related to communication control.

A sequence diagram of a communication protocol operation performed between a called terminal and an adapter is shown. As shown in the figure, when making a call, the calling side communication terminal sends a call setup message to the network side (5a). The network side issues a call setup message to the called terminal (5b) and returns a call setup acceptance message to the calling terminal (5c). In addition, the called terminal that receives the call setting message (5b) returns a call setting acceptance message to the network side (5d) and returns a paging message to the network (5e), and the network side sends a paging message to the calling terminal. Do (5r)
.

Then, when the called terminal Q adapter side is off-hook (response), the called terminal adapter sends a response message to the network side (5g), and the network returns a response message to the calling terminal (5h).

The calling terminal then returns a response confirmation message to the network side 51), and then returns a response confirmation message to the network side or the called terminal/adapter side 51), enabling communication with the calling terminal. Become. Here, when the communication is terminated on the called terminal side, the called terminal sends a disconnection message to the calling terminal side via the network (5k).

As a result, the calling terminal sends a release message to the called terminal via the network (51). Upon receiving this, the called terminal sends a release completion message to the calling terminal via the network (5
■).

FIG. 6 shows a part of the call setting message (5b) transmitted from the network to the above-mentioned called terminal.

Next, the operation of the terminal warping adapter 110 according to the present invention will be explained with reference to the flowcharts of FIGS. 7 and 8.

Assume that the terminal adapter 110 shown in FIG. 1 is now waiting for an incoming call. In this state, the signal control unit 11
2, the switches 113a and 113b are open, and the changeover switches 118a and 118b are switched to the external terminal sillimol overconfidence section 115 side (7a). In this state, the signal control unit 112 monitors the occurrence of incoming calls, but if an incoming call occurs during monitoring, a call setting message is sent from the network as shown by reference numeral 5b in FIG. . This signal is sent to the signal control unit 11 via the network interface unit 110.
2 receives (7b).

Then, the signal control section 112 controls the communication protocol control means 22.
The communication procedure is executed by the function of 0, and messages are sent and received via the network interface unit 110 according to the predetermined message sending and receiving procedure as shown in FIG. The originating address information element identifier x1, the low layer consistency information element identifier LLC, and the high layer consistency information element identifier HLC are extracted from (5b) and temporarily stored in the storage unit 119 (7c, 7d,
7e). Furthermore, a call setup acceptance message (5d) and a paging message (5e) are returned to the network (0, 7g).

Thereafter, the signal control section 112 checks the originating address check means 2.
27 is executed, and it is checked whether there is a matching originating address in the originating address list previously stored in the storage unit 119 (7h). This check is carried out at the step (5b) in FIG. 5 when the calling message is sent. The network side that receives this paging message sends a paging message to the calling party (5f) to inform it that it is being called.

When the calling address check results in a discrepancy, the signal control unit 112 executes the call control means 22B to sound a predetermined special ring tone (7-), notify the operator with a warning sound, and respond to the call control unit 22B. Waiting for key personnel to confirm. Then, when the operator inputs an arbitrary key of the key manual unit 125 within a certain period of time (first key manual operation) (7■, 7o), the signal control unit 112 activates the display control unit 224. Based on the result determined by the originating address check means 227, notification data of the cause of the alarm sound generation is created and displayed on the display unit 118 to inform the operator of the cause (7p). The operator looks at the displayed cause and sends a connection refusal command or a connection request command (7g). This is done by operating the key manual section 125.

When a connection refusal command (second key manual operation) is issued by operating the key manual unit 125 (7''), the signal control unit 112 executes a disconnection procedure (8j) and instructs the network interface unit 110 to disconnect the line. .

Further, in steps (7m, 7o), if the first key operation is not performed within a certain period of time, the signal control unit 11
2 executes the disconnection procedure (8q) and connects the network interface unit 1.
10 to disconnect the line.

As a result, the network interface unit 110 sends a disconnection message (5k) to the network, and the network performs an operation to disconnect the line. Connection request command (
If the third key (manual operation) is performed, the process is forced to proceed to the next step.

In the next step, the data communication parameters of the external data terminal connected to the external terminal interface 117 and the setting parameters of the data communication speed matching unit 114 and the low layer compatibility information element group LLC, which are stored in advance in the storage unit 119, The possibility of overreliability is checked by comparing with the high layer consistency information element group HLC (71, 7j). These are performed by the communication possibility control means 228.

As a result of the check, if there is no possibility of overreliance, that is, if the communication parameters etc. are different from the setting conditions of the external data terminal and terminal adapter on the called side, the call control means 226 causes the specific ring tone to sound again. (8a
, 86), notifies the operator with a warning sound and serves as a key operator for confirmation (8b, Ilm).

Here, when the operator operates any key of the key manual unit 125 (first key manual operation) (8c, 8n), the signal control unit 112 activates the display control unit 224 to enable communication. Create notification data of the cause of the warning sound based on the result determined by the control means 228, and display it on the display section t.
tS to inform the operator of the cause (8d, 8o)
).

The operator looks at the displayed cause and sends a connection refusal command or a connection request command. This is done by operating the key manual section 125. <8 hours when a connection refusal command (operator's second key manual operation) is issued by operating the key manual section 125.
, as), the signal control unit 112 executes a disconnection procedure and instructs the network interface unit 110 to disconnect the line. As a result, the network interface section 110 sends a disconnection message to the network, and the network performs an operation to disconnect the line. When a connection request command (fourth key manual operation) is issued by operating the key manual unit 125 (8e, 8p), the external terminal communication control means 123 is activated to match the data communication parameters, etc. with the calling party. and after this reset (8g, 8
r), the key is waiting for human power, and the operator is in the key human power section 125.
When a connection request command (third key manual operation) is issued by operating (8u, 8v), the signal control unit 112 activates the switches 113a, 113b, 118a, 116.
b is switched to connect the terminal device to the network interface section 110 (7, 71), and a response message is sent to the network (5g) to forcibly receive a call. If the terminal device is a data device, this secures a communication line with the calling terminal, and after the terminal device executes a predetermined procedure for linking with the calling terminal, data communication begins.

The above operation has been explained according to the flowcharts shown in FIGS. 7 and 8. Note that the operating procedure according to this flowchart is stored in advance in a storage section (not shown) of the signal control section 112, and the signal control section 112 performs control according to this flowchart.

As detailed above, this device is a terminal adapter that sends information including subscriber information and communication condition parameters of the calling party from the network side when a call arrives, and allows the called party to check this information. a storage means for storing in advance information of a subscriber who is permitted to receive a call and communication condition parameters of the connected terminal; and an input means for giving a command;
Compares the display means for displaying information and the caller's subscriber information and communication condition parameters received from the network side at the time of an incoming call with the information held in this storage means, and allows the incoming call if the information is correct. a comparison means for generating an alarm signal when there is a discrepancy; a display function means for displaying alarm content on the display means based on the comparison result of the comparison means when an alarm signal is generated; Incoming call control means allows the incoming call when a forced incoming call is commanded from the input means, and if the parameters do not match, resets the parameters so that they match those of the calling party, and then permits the incoming call. The storage means stores in advance the information of subscribers who permit incoming calls and parameters of the communication conditions of the connected terminal, and the comparison means stores the information of the subscriber who permits incoming calls and the parameters of the communication conditions of the connected terminal, and the comparing means The calling side subscriber information and communication condition parameters are compared with the information held in this storage means, and if they match, the incoming call is permitted, and if they do not match, an alarm signal is generated, and an alarm signal is generated. At this time, the display function means causes the display means to display warning contents based on the comparison result by the comparison means, and the operator knows from these that there is an incoming call that does not meet the conditions, and permits communication according to the contents. If the input means commands forced call termination, the call control means will allow the call to be received if the subscriber is not registered for call permission, and if the parameters do not match, the call control means will The parameters are reset to match the calling party, and then the incoming call is allowed.

In this way, even in the case of an incoming call that does not meet the conditions, it is possible to notify that the incoming call is incompatible, and to make communication possible by forcing the call to arrive through the operation of the operator on the called side. .

For security reasons, traditional terminal adapters
It checks the originating address, further checks low layer consistency and high layer consistency, checks communication parameters (condition settings for communication), etc. to check the possibility of communication, and determines whether or not communication is possible. If even one of them is inconsistent,
Although this improves security by preventing connections, it is inconvenient that communication parameters, etc., must be discussed and communicated in advance to enable communication; however, with this device, , by emitting a warning sound to the operator even if conditions such as overconfidence parameters do not completely match,
At this point, the operator makes corrections, etc., so that the receiving terminal matches the parameters of the transmitting terminal, allowing flexible data communication.

Therefore, this device has a security function that registers the calling address and, when an incoming call is received, checks the calling address information in the call setup message sent from the network side and controls the response to the incoming call. If the terminal φ adapter receives an incoming call that does not have a registered calling address, or if there is a mismatch in the overcall condition settings, it will notify you so that you can understand this, and will forcefully respond to the operator's instructions. This allows the user to respond to incoming calls and communicate, thereby improving the degree of freedom in responding to incoming calls while maintaining the security function.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope without changing the gist thereof.

[Effects of the Invention] As described in detail above, according to the present invention, a calling address is registered, and when an incoming call is received, the calling address information in the call setup message sent from the network side is checked to determine whether the call is received. If a terminal adapter that has a security function that controls responses receives an incoming call that does not have a registered calling address, or if there is a mismatch in the communication condition settings, it will notify you so that you can understand this, and It is possible to provide a terminal adapter that can forcibly answer an incoming call and communicate according to an operator's operation, thereby improving the degree of freedom in answering an incoming call while maintaining the security function.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an embodiment of the present invention.
Figure 2 shows an l5D using the terminal adapter of the present invention.
FIG. 3 is a system block diagram showing the schematic configuration of the N network; FIG. 3 is a diagram showing the transmission frame of I5DN; FIG. is the calling terminal. FIG. 6 is a diagram showing an example of a call setup message; FIGS. 7 and 8 are flowcharts showing an example of the operation of this system. , FIG. 9 is a diagram for explaining the conceptual system configuration of I5DN, and FIG. 10 is a block diagram for explaining an example of the configuration of a conventional terminal adapter. too 201...Terminal adapter, 102
...I SDN exchange, 103...Digital communication network subscriber line home bus, 1
10... Network interface section, 112... Signal control section, 113a, 113b... B channel switch,
114... Data communication speed matching unit, 115... External terminal serial communication unit, 18a 118b... Selector switch,... External terminal interface unit,... Display unit, 119... Storage unit, ...Key Human Resources Department, 2152...Existing data terminal.

Claims (2)

[Claims] (1) When a call is received, the network side sends out information including the calling party's subscriber information, and the called party receives this information.It is connected to a digital public network and has an interface with this digital public network. A terminal adapter that converts the interface of a terminal device that does not conform to the standard to conform to the interface standard of this digital public network, has a storage means for pre-holding information on subscribers who are permitted to receive calls, and an input for giving commands. and a comparison method that compares the subscriber information of the calling side received from the network side at the time of an incoming call with the information held in this storage means, and if they match, the incoming call is permitted, and if there is a mismatch, an alarm signal is generated. and a call control means for permitting an incoming call when a forced incoming call is commanded from the input means when an alarm signal is generated. (2) When a call is received, the network side sends information including subscriber information and communication condition parameters of the calling side, and the called side is connected to a digital public network that allows the called side to receive this information. In a terminal adapter that converts a terminal device that does not conform to the interface standard of the digital public network to conform to the interface standard of this digital public network, information of the subscriber who is permitted to receive calls and parameters of the communication conditions of the connected terminal an input means for giving commands; a display means for displaying information; a comparison means that compares the information held by the means with information held by the means, and when a match is found, the incoming call is permitted; and when there is a mismatch, an alarm signal is generated; a display function means for displaying on the display means; and when an alarm signal is generated, if a forced incoming call is commanded from the input means, the incoming call is permitted, and if the parameters do not match, the parameters are re-written to match those of the calling party. A terminal adapter comprising an incoming call control means that performs settings and then forcibly permits incoming calls.