JP2820734B2 - Control method for ISDN terminal device and control method for group 4 facsimile terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling an ISDN terminal device and a group 4 control method.
The present invention relates to a method for controlling a facsimile terminal device.

2. Description of the Related Art For example, in an ISDN terminal device such as a group 4 facsimile device that uses ISDN (Integrated Services Digital Network) as a transmission path, if the destination of a call has moved and the ISDN number has been changed, From then on, the call is rejected along with the notification that the other terminal has changed the number.

[Problems to be Solved by the Invention] Therefore, conventionally, when the ISDN number of the destination is changed as described above, until the operator of the terminal device can know the ISDN number after the transfer of the destination, There has been an inconvenience that images cannot be transmitted to the destination. Also, the operator has to do the work for that.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a control method of an ISDN terminal device and a control method of a group 4 facsimile terminal device capable of automatically calling a transfer destination ISDN number.

[Means for Solving the Problems] The present invention relates to a method for controlling an ISDN terminal device using ISDN as a transmission path, wherein a call setting procedure signal for rejecting a call from ISDN during a call setting procedure with ISDN is provided. When received via the signaling channel, while determining that the call was rejected and aborting the call setup operation at that time, when the rejection cause notified by the call setup procedure signal received at that time is a change of the partner terminal number, The new destination terminal number added to the call setup procedure signal is extracted, and a re-call operation is performed using the new destination terminal number.
This is a visual indication that the ISDN number of the specified destination has been changed.

Also, in a control method of an ISDN terminal device using ISDN as a transmission path, when a predetermined call setup procedure signal for rejecting a call from ISDN is received via a signal channel during a call setup procedure with ISDN, the call is rejected. While the call setting operation is terminated and the call setting operation at that time is aborted, if the rejection cause notified by the call setting procedure signal received at that time is a change of the partner terminal number, the new call setting procedure Extracts the destination terminal number, performs a recall operation using the new destination terminal number, and records and outputs a report to the user notifying that the ISDN number of the specified destination has changed. Things.

Also, in the control method of a group 4 facsimile terminal device using ISDN as a transmission path, when a predetermined call setting procedure signal for rejecting a call from ISDN is received via a signal channel during a call setting procedure with ISDN, Is determined to have been rejected and the call setting operation at that time is aborted, while the rejection cause notified by the call setting procedure signal received at that time is a change of the destination terminal number, the call setting procedure signal is added. The new remote terminal number is extracted, and the new call operation is performed using the new remote terminal number.
This is for visually displaying to the user that the ISDN number of the designated destination has been changed.

[Operation] Therefore, even when the destination terminal is moved and its ISDN number is changed, the relocation destination can be appropriately re-called, so that quick data transmission can be performed. In addition, the user visually reminds that the ISDN number has been changed due to the transfer of the partner terminal or a report notifying the user of the change is recorded and output, so the user re-registers the ISDN number for the partner terminal. Can take appropriate measures such as IS
Smooth communication between the DN terminal device and the group 4 facsimile terminal device becomes possible.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a group 4 facsimile apparatus according to an embodiment of the present invention.

The system control section 1 performs processing for controlling the operation of each section of the group 4 facsimile apparatus.
The system memory 2 stores a control processing program to be executed by the system control unit 1 and various constants necessary for executing the control processing program, and constitutes a work area of the system control unit 1.
The parameter memory 3 is for storing various data unique to the group 4 facsimile machine.
The parameter memory 3 is backed up by a battery.

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

The operation display unit 6 is used to operate the group 4 facsimile apparatus, and includes various operation keys such as numeric keys and one-touch dial keys, and various display devices such as a liquid crystal display.

The encoding / decoding unit 7 encodes and compresses the image signal and decodes the encoded and compressed image information into the original image signal.

The image storage device 8 stores an image signal file and an image information file, and is composed of a large-capacity external storage device.

The ISDN interface circuit 9 is for connecting the ISDN to the facsimile apparatus, and the layer 1 signal control section 10 is for controlling the signal of the ISDN layer 1, and is mainly used for call control. It also has a function of separating / integrating a D-channel (signal channel) signal used and a B-channel (information channel) signal used for data transmission.

The D channel transmission control unit 11 is for performing ISDN call setting control using the D channel and transmission control processing for packet transmission. The B channel transmission control units 12 and 13 Is used to perform a transmission control process for data transmission performed by using.

System control unit 1, system memory 2, parameter memory 3, scanner 4, plotter 5, operation display unit 6, encoding / decoding unit 7, image storage device 8, D-channel transmission control unit
11 and the B-channel transmission control units 12 and 13 are connected to a system bus 14, respectively, and various types of data such as control information and transmission data between these elements are exchanged via the system bus 14. Done.

The two B-channel signals and the D-channel signals on the ISDN are transmitted to the layer 1 signal control unit 10 and the B channel transmission control units 12 and 13 and the layer 1 signal control unit 10 and the D channel transmission control unit 11 respectively. Are exchanged between them.

Here, a call control procedure performed by a terminal device using ISDN with ISDN will be described.

As shown in FIG. 2 (a), the calling terminal first sends a call setup message SETUP designating the destination terminal to the destination to the ISDN to request a call setup with the destination terminal. A call setup message SETUP is sent to the called terminal to make a call. ISDN sends a call setting acceptance message CALL_PROC for notifying the call setting status to the calling terminal.

Upon detecting an incoming call, the called terminal sends out a calling message ALERT to ISDN continuously at a predetermined interval when the own terminal is in a state where it can receive a call.
T is transmitted to the calling terminal to notify that calling of the called terminal has started.

When the called terminal answers the incoming call, the response message CONN is sent to ISDN.
ISDN sends a response message CONN to the calling terminal to notify that the called terminal has accepted the call.

Also, ISDN sends a response confirmation message CONN_ACK to the called terminal.
To confirm the response of the called terminal, at which point an information channel (B channel) for data transmission is established between the calling terminal and the called terminal.

Thus, data transmission using the information channel is performed between the calling terminal and the called terminal according to the transmission control procedure set for the transmission function of each terminal.

When the data transmission is completed, the originating terminal sends a disconnection message DISC to the ISDN to request release of the information channel, and the ISDN sends a disconnection message DISC to the destination terminal to notify the destination of the restoration of the information channel.

As a result, when the destination terminal responds to the ISDN with a release message REL for notifying the completion of the channel disconnection, the release message REL is transmitted from the ISDN to the calling terminal. When the channel release is completed, the calling terminal issues a release completion message REL_COMP to the ISDN.
To notify that fact, ISDN sends a release completion message REL_COMP to the destination terminal, the release of the information channel is established, and the information channel set between the calling terminal and the destination terminal Is completely released.

Thus, an information channel is set between the calling terminal and the called terminal, data transmission is performed, and when the data transmission ends, the information channel is released.

Also, for example, when the number of the designated called terminal is missing or the number has been changed, so that it is impossible to make a call connection with the terminal of the designated called number, IS
The DN responds to the calling terminal with a release completion message REL_COMP including the reason for the rejection, and rejects the calling from the calling terminal, as shown in FIG. As a result, the calling terminal releases the call.

For example, when the data terminal is moved and the user of the data terminal signs a new ISDN number with an ISDN line carrier, the ISDN number of the data terminal is changed, and A service for notifying the calling side of the new ISDN number after the change can be contracted for a certain period. In this case, the call is rejected because it is basically a missing number.

With the above configuration, when the operator sets the transmission original on the scanner 4 and inputs the ISDN number of the destination from the operation display unit 6 to instruct the start of transmission, the image information is processed by the processing as shown in FIG. A transmission operation is performed.

That is, first, with the ISDN number input at that time set as the called number (process 101), the call setting message S
ETUP is sent to ISDN to call the destination (process 102), and ISDN
(Step 103).

Then, it is determined whether the content of the response received at that time is a response message CONN, a release completion message REL_COMP, or another message (decisions 104 and 105).

If the received content is neither the response message CONN nor the release completion message REL_COMP (the result of the determination 105 is NO), a process corresponding to the received message is performed (process 106), and the process 103 Return, receive either the response message CONN or the release completion message REL_COMP.

When the release completion message REL_COMP is received and the result of the determination 105 becomes YES, the call is rejected, so the calling operation at that time is terminated, and the reason indication included in the release completion message REL_COMP is displayed. The cause of disconnection is identified based on the content of the information element (process 107), and it is determined whether the reason is a change in the partner terminal number (decision 108).

When the result of the determination 108 is NO, the fact that image information cannot be transmitted and the cause of the failure are displayed and output from the operation display unit 6 (process 109), and this transmission process ends.

When the result of the determination 108 is YES, with the new destination terminal number included in the release completion message REL_COMP set as the called number (process 110), the process returns to the process 102 to call the new ISDN number. (Recall).

When the response message CONN is received and the result of the determination 104 is YES, the B channel is established (step 11).
1), a pre-transmission procedure is performed to negotiate a transmission function with the partner terminal (step 112). When transmission preparation is completed, a predetermined data transmission procedure is executed between the partner terminal and the scanner 4.
Then, the image information obtained by reading the image information is further compressed and encoded by the encoding / decoding unit 7 and transmitted to the partner terminal (process 113).

When the transmission of the image information is completed, a predetermined post-data transmission procedure is executed to terminate the image information transmission with the partner terminal (processing 114), release the B channel (processing 115),
The call is restored (process 116), and this communication process ends.

In this way, in this embodiment, when the call is rejected at the time of calling, if the reason is the change of the remote terminal number, the new remote terminal number notified by ISDN at that time is stored, Since the new destination terminal number has been recalled, the designated destination can be immediately called.

At this time, for example, the fact that the ISDN number of the designated destination has been changed, and that the new IS
A report for notifying the DN number may be formed, and the image may be recorded and output from the plotter 5. Also, by displaying on the operation display section 6 that the ISDN number of the designated destination has been changed and the ISDN number after the change,
The operator may be notified that the ISDN number of the destination has been changed.

Although the present invention is applied to the group 4 facsimile apparatus in the above-described embodiment, the present invention can be similarly applied to other ISDN terminal apparatuses.

[Effect of the Invention] As described above, according to the present invention, as a transmission path
In a control method of an ISDN terminal device using ISDN, when a predetermined call setup procedure signal for rejecting a call from ISDN is received via a signal channel during a call setup procedure with ISDN, it is determined that the call is rejected. While the call setup operation at that time is aborted, if the rejection cause notified by the call setup procedure signal received at that time is a change of the other party's terminal number, a new partner terminal number added to the call setup procedure signal is extracted. The new destination terminal number is used to perform a recall operation and the user is made to visually indicate that the designated destination's ISDN number has been changed. Even if your ISDN number changes,
Since the relocation destination can be appropriately re-called, there is an effect that quick data transmission can be performed. In addition, the user is visibly notified that the other terminal has moved and the ISDN number has been changed.
Appropriate measures such as re-recording of the ISDN number can be taken, and the effect of enabling smooth communication of the ISDN terminal device can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a group 4 facsimile apparatus according to an embodiment of the present invention, FIG. 2 (a) is a time chart showing an example of a call control procedure between an ISDN and a terminal, and FIG. ) Is a time chart showing a procedure example when the ISDN rejects a call, and FIG. 3 is a flowchart showing an example of an operation at the time of calling. 1. System control unit 2. System memory

Claims (3)

(57) [Claims] 1. A method for controlling an ISDN terminal device using ISDN as a transmission path, comprising: receiving a predetermined call setting procedure signal for rejecting a call from ISDN via a signal channel during a call setting procedure with ISDN;
While determining that the call was rejected and aborting the call setting operation at that time, when the rejection cause notified by the call setting procedure signal received at that time is a change in the other terminal number,
The new destination terminal number added to the call setup procedure signal is extracted, a re-call operation is performed using the new destination terminal number, and the IS of the designated destination is notified to the user.
A method for controlling an ISDN terminal device, wherein a visual indication that a DN number has been changed is displayed. 2. A method for controlling an ISDN terminal device using ISDN as a transmission path, comprising: receiving a predetermined call setup procedure signal for rejecting a call from ISDN via a signal channel during a call setup procedure with ISDN;
While determining that the call was rejected and aborting the call setting operation at that time, when the rejection cause notified by the call setting procedure signal received at that time is a change in the other terminal number,
The new destination terminal number added to the call setup procedure signal is extracted, a re-call operation is performed using the new destination terminal number, and the IS of the designated destination is notified to the user.
A method for controlling an ISDN terminal device, comprising recording and outputting a report notifying that a DN number has been changed. 3. A method for controlling a group 4 facsimile terminal device using ISDN as a transmission line, wherein a predetermined call setting procedure signal for rejecting a call from ISDN during a call setting procedure with ISDN is received via a signal channel. Then
While determining that the call was rejected and aborting the call setting operation at that time, when the rejection cause notified by the call setting procedure signal received at that time is a change in the other terminal number,
The new destination terminal number added to the call setup procedure signal is extracted, a re-call operation is performed using the new destination terminal number, and the IS of the designated destination is notified to the user.
A method for controlling a group 4 facsimile terminal device, wherein the fact that a DN number has been changed is visually displayed.