JPH0278353A - Control system for isdn terminal equipment - Google Patents

Abstract

PURPOSE:To limit an incoming opposite terminal equipment properly by realizing the selection reception mode limiting an opposite terminal equipment for incoming reply from an outgoing subaddress included in a call setting message. CONSTITUTION:An outgoing terminal equipment sends a call setting message SETUP to an ISDN and sends the SETUP to a designated incoming terminal equipment designated to make dialing. Moreover, the incoming terminal equipment sends a call message ALERT to call the incoming terminal equipment. When an incoming call is replied, a reply message CONN is sent to inform it that the incoming terminal equipment receives the call. Thus, the information channel for the transmission is established between the outgoing terminal equipment and the incoming terminal equipment. When the data transmission is finished, a cut-off message DISC is sent to the incoming terminal equipment to restore the information channel. Thus, the information channel between the outgoing terminal equipment and the incoming terminal equipment is completely released.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to an ISD using ISDN as a data transmission path.
This invention relates to a control method for N terminal devices.

[Background Art] In recent years, ISDN (Integrated Service Digital Communication Network) has been developed, and data terminal devices that exchange data using ISDN are gradually coming into use.

This ISDN will replace the previous PSTN (Public Telephone Network) in the future, but until this replacement is completely completed, both ISDN and PS-TN will be used. . Also, in this case, ISDN and PSTN
It is considered that data terminal devices connected to the ISDN and data terminal devices of the same type connected to the PSTN can exchange data.

By the way, when a data terminal device is connected to an open public network such as ISDN or PSTN, it may respond to unnecessary incoming calls and suffer damage.

For example, with a telephone, you may be bothered or uncomfortable by prank calls or unnecessary sales calls, or with a facsimile machine, you may receive unwanted direct mail or harassing images. This may lead to inconveniences such as wasted resources and the inability to use unattended facsimile machines.

On the other hand, in ISDN, the call setup message that the terminating terminal receives when a call arrives includes a calling number information element that indicates the telephone number of the calling terminal. It is possible to limit the terminals that respond to incoming calls.

That is, all the calling numbers of the other party's terminals that respond to incoming calls are registered in advance, and when a call setting message with an unregistered calling number is received, the incoming call is ignored.

[Problems to be Solved by the Invention] However, in this conventional method, the calling numbers of all the terminals that respond to incoming calls are registered, and as the number of terminals increases, the registration process becomes complicated. cause inconvenience. Furthermore, as the number of calling numbers to be registered increases, the risk of erroneous registration of the calling number increases accordingly, which may cause the inconvenience of responding to an incoming call from a terminal that has been erroneously registered.

Furthermore, when the calling party number of the other party's terminal is changed, an inconvenience arises in that it is necessary to update the calling number.

The present invention has been made in view of these circumstances, and can appropriately limit the activity of the other party who responds to one incoming call.
Another object of the present invention is to provide a control method for an ISDN terminal device that is easy to operate.

[Means for Solving the Problems] The present invention realizes a selective reception mode in which the destination terminals that respond to incoming calls are restricted by the originating subaddress included in the call setting message.

[Function] Therefore, by registering only one piece of identification information, it is possible to limit the terminals that respond to incoming calls, which greatly simplifies the operation.

Furthermore, even if the calling number of the other party's terminal changes, there is no need for an update operation on the receiving terminal side, making it very convenient to use.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a Group 4 facsimile machine according to one embodiment of the invention.

In the figure, a system control unit 1 executes control processing for the entire group 4 facsimile device,
The system memory 2 stores a control processing program executed by the system control unit 1 and various data necessary for the control processing program. The parameter memory 3 is for storing various information specific to this Group 4 facsimile device, such as speed dial information and a calling sub-address to be referred to when setting a selective reception mode.

The scanner 4 is for reading a transmitted document at a predetermined resolution, and the plotter 5 is for recording and outputting an image at a predetermined resolution.

The operation display section 6 is for operating this facsimile device, and the encoding/decoding section 7 encodes and compresses the image signal and decodes the compressed image information into the original image signal. It is for.

The image storage device 8 is for storing encoded and compressed image information, and the group 4 transmission control unit 9
The ISDN line control unit 10 is for executing transmission control procedure processing of group 4 facsimile equipment.
This is to realize the line control processing of the basic interface function of SDN, and is the ISDN interface circuit 1.
1 is for connecting this Group 4 facsimile device to ISDN.

Here, the ISDN line control unit 1o is the ISDN line controller 3
The ISDN interface circuit 11 realizes the line control functions of ISDN layers 1 and 2.

System control unit 1, system memory 2. Parameter memory 3, scanner 4, plotter 5. The operation display section 6 encoding/decoding section 71, image storage device 8, and group 4 facsimile transmission control section 9 exchange various necessary information with each other via the system bus 12.

In addition, the group 4 facsimile transmission control unit 9, ISDN
The line control unit IO1 and the ISDN interface circuit 11 use the local bus 13 to exchange signals on the D channel (signal channel), and use the local bus 14 to exchange signals on the B channel (information channel). exchanging information. Also, this local bus 13,1
4 is also connected to the system bus 12, and ISDN
Line control unit 10 and ISDN interface circuit 11
exchanges various necessary information with the system control unit 1 via the local buses 13 and 14 and the system bus 12.

FIG. 2 shows an example of the operation surface of the operation display section 6. As shown in FIG.

In the figure, a start key 68 is used to start the sending and receiving operations of the facsimile machine, and a stop key 6b is used to stop the operation of the facsimile machine.

The numeric keypad 6c is used to input numerical information such as telephone numbers and speed dials, and the selective reception mode key 6d is used to set a selective reception mode that limits the terminals that respond to incoming calls. The calling sub-address key 6e is used to WB a calling sub-address for restricting partner terminals in the selective reception mode, or a calling sub-address to be included in a call setting message (described later) at the time of one outgoing call.

The enter key 6f is used to confirm the numerical information entered manually using the numeric keypad 6c and to set the timing for importing it into the system.

The liquid crystal display 6g is for displaying and outputting various display information such as operation guidance messages from the facsimile machine to the operator and usage charges.

Here, the ISD of this group 4 fax machine etc.
The basic data transmission procedure performed by the N terminal device will be explained.

As shown in FIG. 3, the originating terminal first sends a call setup message 5ETUP to the ISDN to request call setup with the terminating terminal, and the ISDN sends a call setup message SET[JP] to the specified terminating terminal. Send/call.

Further, the ISDN sends a call setup acceptance message CALL-PROC to the originating terminal to notify the call setup status.

When the destination terminal detects an incoming call, it sends a paging message A to the rsDN.
LERT is sent, ISDN sends a calling message ALER
T is sent to the calling terminal to notify that the calling terminal has started calling.

When the destination terminal responds to the incoming call, it sends a response message C0NN to I
The ISDN sends a response message C0NN to the calling terminal to notify that the called terminal has accepted the call.

In addition, ISDN sends a response confirmation message C0N to the destination terminal.
NJCK is sent and the response from the destination terminal is confirmed, at which point an information channel for data transmission is established between the originating terminal and the right terminal.

Thereby, data transmission between the originating terminal and the right terminal is executed according to the transmission # control procedure set for each transmission function. For example, a Group 4 facsimile device performs data transmission based on the Group 4 Facsimile Transmission II control procedure.

When the data transmission is finished, the first terminal sends a disconnection message DISC to the ISDN to request release of the information channel, and the ISDN sends a disconnection message orsc to the right terminal to notify that the information channel has been restored.

As a result, when the destination terminal responds to the ISDN with a release message REL notifying completion of channel disconnection, the ISDN sends a release message REL to the originating terminal. When the channel release is completed, the originating terminal sends a release completion message RE.
L-COMP is sent to the ISDN to notify the ISDN, and the ISDN then sends a release completion message REL, -
By sending COMP to the destination terminal, the information channel is released, and the information channel set between the originating terminal and the destination terminal is completely released.

In this way, an information channel is established between the originating terminal and the destination terminal, data transmission is performed, and the information channel is released.

Now, each message for call setup is shown in Figure 4 (a).
), a protocol identifier for identifying the protocol specifications (format, sequence, etc.) that define the layer 3 call control message, and a call number for identifying which call the message is related to. , a message type to identify the content of each message, and mandatory information elements that are always added to each message.

and additional information elements added to each message as necessary. Note that the required information elements are 0. 1 or a plurality of additional information elements are set, and 0.1 or a plurality of additional information elements are arranged depending on the situation.

As shown in FIG. 5(b), the call setup message 5ETUP has a "transmission ability" as an essential information element, and has 1 as an additional information element, for example, a "progress identifier", "calling number",
1st sub-address, 1st sub-address, called number, 1st sub-address.
, "low layer compatibility", and "high layer compatibility j".

The additional information elements of the call setup message 5ETUP are as follows:
Depending on the situation at the time, more information elements may be included.

An overview of these information elements will be explained below.

The "Transmission Capability" information element indicates the content of the information to be transmitted.

Audio, Unrestricted Digital Information, Restricted Digital Information, 3.1
KIlz audio, 7KHz audio, or.

Information transfer ability that indicates which video is.

Transfer mode indicating whether the switching function to be used is circuit switching or packet switching, information transfer rate indicating the information transfer speed, information indicating the information transfer form, and information indicating the user information protocol. Consists of etc.

The "Progress Identifier" information element indicates events that occurred during the origination of the call, such as that the call is not an industrial SDN end-end, that the terminating terminal is a non-ISDN terminal, that the originating terminal is a non-ISDN terminal.
This is used to display information such as that it is a terminal.

The "calling number" information element indicates the ISDN address (number) of the calling terminal, and the "calling subaddress" information element is for identifying multiple terminal devices that use the same calling number. However, in the present invention, this "originating subaddress" information element is used to identify the originating terminal that responds to an incoming call in the selective reception mode.

The ``r called party number'' information element indicates the ISDN address of the called terminal, and the information element ``1st called party subaddress'' is for identifying a plurality of terminal devices using the same called number.

The "lower layer compatibility" information element is used to check the possibility of communication with a partner terminal, and its basic content is the same as the "transmission capability" information element.

Furthermore, this "lower layer compatibility" information element includes further details.

The "higher layer compatibility" information element is used to check the compatibility with the other terminal, and is used for group 2/group 3 facsimile, group 4 facsimile, mixed mode, teletex, videotex, telex,
Alternatively, it is used to display which message handling system is provided as a terminal function.

With the above configuration, the operator of this Group 4 facsimile device registers in advance in the Group 4 facsimile device the originating sub-address to be used as identification information when setting the selective reception mode.

This registration operation is performed, for example, as follows.

That is, when the group 4 facsimile machine is in the standby state, the 1 selection reception mode key 6d and the origination subaddress key 6e are pressed simultaneously to set the registration state of the origination subaddress used as identification information in the selection reception mode.

As a result, the system control unit 1 displays a guidance message for registering the calling sub-address on the liquid crystal display 6g, which allows the operator to input up to 40 digits of the calling sub-address by operating the numeric keypad 60 and correct the calling sub-address. After entering the calling subaddress, press the enter key 6f,
Confirm the input sub-address.

As a result, the system control unit 1 registers the information on the calling sub-address inputted at that time in the parameter memory 3 as the reception-selected calling sub-address.

In this state, when the ISDN line control unit 10 receives one call and receives a layer 3 activation request from one calling terminal.

Group 4 facsimile transmission processing is performed by executing the processing shown in FIG.

That is, at that time, the ISDN interface circuit 11
The "protocol identifier" information element of the input message is extracted and checked to see if it is a layer 3 call control message (decision 101).

When the result of judgment 101 is YES, the "call number"
The information element is fetched (process 102), and it is checked whether the content of the "message type" information element is the call setup message 5IETUP (decision 103).

When the result of judgment 103 is YES, "extract the contents of the transmission capability J information element and check whether it matches the transmission capability set for the own terminal (judgment 104).
When the result of decision 104 is YES, it is checked whether the own terminal is set to receive selection mode at that time (decision tOS).

Here, if the selective reception mode key 6d of the operation display section 6 is turned on in advance and the selective reception mode is set, the result of judgment 105 becomes YES, and as a result, the information element up to the "originating subaddress" information element is The information elements are extracted and processing corresponding to each information element is executed (process 106).

Then, it is checked whether the "one-shot subaddress" information element is included (decision 107), and the result of determination 107 is YES.
When the ISDN line control unit 10 becomes S, the ISDN line control unit 10 requests the system control unit 1 to read out the receiving selective calling subaddress registered in its own terminal, thereby reading out the content notified by the system control unit 1 and the content notified at this time. It is checked whether the contents of the ``1-call subaddress'' information element included in the call setup message 5IETLIP received in 2008 match (decision 108).

When the result of judgment 108 is YES, the information elements up to the "lower layer consistency" information element are extracted and processing corresponding to each information element is executed (process 109).
).

Then, it is checked whether the "lower layer consistency" information element is included (decision 110), and the result of decision 110 is Y.
[When becoming an ES, it is checked whether the contents of the "low layer compatibility" information element match the low layer compatibility of the own terminal and communication is possible (determination 111).

When the result of decision 111 is YES, it is checked whether the "higher layer compatibility" information element is included (decision 112), and when the result of decision 112 is YES, the "higher layer compatibility" information element is checked (decision 112). It is checked whether the contents of the terminal match the high layer compatibility of the own terminal and whether communication is possible (determination 113).

When the result of the judgment 113 is YES, the process moves to the subsequent process 114) to send the calling message ALIERT or the response message C0NN depending on the situation.

Further, if the protocol identifiers do not match and the result of 1 judgment 101 is No, the incoming call is ignored and processed 115
), returns to call waiting state.

Ignoring such an incoming call means that when the transmission capabilities do not match and the result of judgment 104 is No, the call setup message 5ETUP is sent even though the selective reception mode is set.
does not contain a calling sub-address and the result of judgment 107 is NO, in the case where the selective reception mode is set and the calling sub-address is included in the call setup message 5ETUP, but the calling sub-address is not a selective receiving sub-address. When the result of decision 108 is NO because it does not match what is registered as a subaddress, when the result of decision 111 is NO because low layer consistency does not match, and
The result of decision 113 is NO because the higher layer consistency does not match.
It is also performed when the call is reached, and no further call receiving operations are performed.

In this way, if the ISDN transitions to the ignore state in the middle of a call receiving operation, the ISDN will not be able to obtain a specified response signal from the called terminal even after a certain period of time has elapsed.

At that point, the call setting operation is interrupted and the originating terminal is notified of this.

As a result, communication from the originating terminal is interrupted.

Also, if the first message input from the ISDN interface circuit 11 is 1 other than the call setup message 5ETUP,
When the result of judgment 103 is NO, a release message REL is sent (process 116), and the process shifts to an incoming call standby state.

In addition, when the selective reception mode is not set and the result of judgment 105 is NO, the information elements from the "Transmission Capability" information element to the "Low Layer Consistency" information element are extracted, and each The processing corresponding to the information element is executed (process 117), and the process moves to judgment 110.

Further, if the result of 1 judgment 110 is NO, judgment 111
If the result of the judgment 112 is No, the judgment 113 is skipped and the process proceeds to the process 11.
Move to 4.

In this way, in this embodiment, when the selective reception mode is set, when it is detected that the call setup message 5ETUP received from the calling terminal does not include the "calling subaddress" information element; , 1 subaddress" information element but does not match the reception selection subaddress registered in the own terminal, the incoming call operation is interrupted at that point and no further response signals are output. Image information for image information transmission set by a sender who does not know the specified sender sub-address is not received.

That is, this group 4 facsimile'! The operator of Am notifies the operator of the Group 4 facsimile device, which may be the sender, of the calling sub-address in advance.

When transmitting image information to this group 4 facsimile device, the operator of the originating terminal sets the transmission document on the scanner 4, inputs the ISDN address of the destination terminal from the numeric keypad 6c of the operation display section 6, and Enter the settings for the transmission function at that time.

At the same time, prior to the call initiation operation, the calling sub-address key 60 of the operation display section 6 is turned on to set the calling sub-address registration mode, and the first destination terminal is notified according to the guidance message displayed on the liquid crystal display 6g. Enter the calling subaddress.

Then, the start key 68 is turned on to start image information transmission.

As a result, the call setup message 5ETUP is sent to the single-originating terminal.
The message is then sent to the ISDN, including the calling subaddress that was input at that time.

As a result, the call setting message 5ETUP in which the specified calling sub-address is inserted is sent to the destination terminal, so that the destination terminal can receive the call normally, and thereby the group 4 facsimile image information can be transmitted.

By the way, for example, by setting the same reception selection/originating sub-address for all Group 4 facsimile devices connected in a closed area, the closed area connection function can be realized without using the services provided by ISDN.

In the above-mentioned embodiment, the present invention is applied to a group 4 facsimile device that uses ISDN as a transmission line, but the present invention can also be applied to other l5-DN terminal devices 5, such as telephones, etc. can be applied.

Furthermore, in the embodiment described above, the number of digits of the receiving selective origination subaddress is limited to 40 digits, but this number of digits is limited to:
Depends on ISDN. Further, the number of digits is not limited as long as it is within the limit.

[Effects of the Invention] As explained above, according to the present invention, the destination terminals that respond to incoming calls are restricted by the calling sub-address included in the call setup message, so by registering only one piece of identification information, You can limit the number of terminals that can answer incoming calls, making operation very easy. Furthermore, even if the calling number of the other party's terminal is changed, there is no need for an update operation on the receiving terminal side, resulting in an effect of very good usability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a Group 4 facsimile device according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of an operation display section, and FIG. 3 is an example of a transmission procedure in ISDN. 4(a) is a schematic diagram showing the basic format of a message for call setup, and FIG.
) is a schematic diagram showing an example of information elements of a message for call setting, and FIG. 5 is a flowchart showing an example of processing at the time of incoming call operation. 1... System control unit, 2... System memory, 3
...Parameter memory, 6...Operation display section, 6C.
...Numeric keypad, 6d...Selection reception key, 6e...Calling sub address key, 10...ISDN line control unit, 1
1...ISDN interface circuit. Figure 1 @ Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] ISD that transmits data using ISDN as a transmission path
In the control method of the N terminal device, there is a calling sub-address setting input means for setting and inputting a calling sub-address, a selective receiving mode setting means for setting a selective receiving mode for restricting destinations at the time of an incoming call, and a selective receiving mode setting means for setting a selective receiving mode for restricting destinations when a call is received; A receiving selection calling sub-address registration means is provided for registering a calling sub-address for specifying a permitted destination, and the calling side inserts the calling sub-address set and inputted by the calling sub-address setting input means into a call setting message at the time of making a call. However, on the called side, when the selective reception mode is set by the selective reception mode setting means, the caller registered in the reception selective calling subaddress registration means is added to the call setting message received after detecting an incoming call. A control method for an ISDN terminal device, characterized in that only when a subaddress is included, subsequent transmission procedure processing is executed.