JPH03274961A - Communication system for communication terminal equipment - Google Patents

Abstract

PURPOSE:To improve the communication efficiency by informing a time till the arrival to a communication enable state to a caller terminal equipment from a called terminal equipment when the called terminal equipment is in a facsimile communication disable state. CONSTITUTION:A caller terminal equipment sends a call setting message. Upon the receipt of the call setting message, the called terminal equipment does not reject a call but calculates and predicts in how much time a current busy state is released. This is implemented, for example, by reading a transmission original in advance at a read control section 71 and storing the result in a memory control section 74. Since transmission of page number is grasped in advance, the time required for the transmission is predicted. Then time information (code) obtained by the calculation is set to a user.user information area of the call message together with a busy state and its call message is sent to the caller terminal equipment. Thus, the caller terminal equipment surely recognizes a timing when the called terminal equipment reaches a communication enable state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication system for a communication terminal device that performs facsimile communication via an integrated service digital network.

[Prior Art] Conventionally, when a terminal device (A) which is a calling terminal device in a communication terminal device connected to an integrated service digital network (hereinafter referred to as 15DN) sets up a call for facsimile communication. When the called terminal device (B) is busy communicating with another device, the operation follows the communication sequence shown in FIG. 3.

In other words, when the terminal device (A) starts communication with the terminal device (B) using the D channel, which is a signal channel, if the terminal device (B) is in a busy state, the terminal device (^)
will cut off the line, wait for the redial time, call again after a certain period of time, and at this time the terminal device (B) is still connected.
If the line was in a busy state, the line was cut off again, and after a certain period of time the terminal device (^) made a call again, repeating this a preset limited number of times.

When the terminal device (B) becomes idle, that is, ready to communicate, during repeated calls, the subsequent terminal device (B)
In response to the call from A), the terminal device <8) responds, thereby enabling facsimile communication from the terminal device (A) to the terminal device (B) and transmitting the manuscript.

However, in this communication method, when the called terminal is busy, the calling terminal always waits for a certain period of time before dialing, and then calls again. Even if the busy state is released and the communication becomes possible, communication cannot be started immediately, resulting in poor communication efficiency.

Therefore, as seen in Japanese Utility Model Application Publication No. 1-113465, if a call is received from the other station and the own station is in a state where reception is not possible, this is notified to the other station, and the other station's information (
There is a known system that prevents the other station from re-calling many times by memorizing the caller's ID (ID, etc.) and notifying the other station of the receivable status based on the stored information when the own station becomes able to receive the call. .

[Problems to be Solved by the Invention] However, even if the called terminal device, which is the local station, notifies the calling terminal device, which is the other station, of the reception ready state when the busy state is released, It is not possible for the calling terminal to know when it will become ready for reception, and therefore the calling terminal may end up communicating with another terminal before being notified of the ready state from the called terminal. In such a case, the calling terminal device becomes busy with the called terminal device, making it impossible to smoothly start communication with the called terminal device.

Therefore, in the present invention, when a called terminal device is in a state where facsimile communication is not possible when a call is set up from a calling terminal device, the called terminal device notifies the calling terminal device how long it will take to become communicable. Therefore, the present invention aims to provide a communication system for a communication terminal device in which the calling terminal device can reliably know the timing when the called terminal device becomes ready for communication.

In addition, by re-calling the called terminal when the called terminal becomes ready for communication, the calling terminal can smoothly start facsimile communication between the calling terminal and the called terminal after communication is disabled. The present invention aims to provide a communication method for a communication terminal device that can improve efficiency.

[Means and effects for solving the problem] The invention corresponding to claim (1) provides that when facsimile communication is performed from a calling terminal device to a called terminal device via an integrated service digital network, the called terminal device If the facsimile communication is disabled when a call is received from the calling terminal, the system accepts the call, calculates the time until it becomes available for facsimile communication, and uses the calculated result to notify the calling terminal of the facsimile communication disabled state. The purpose is to send it along with notification information and disconnect the line. Therefore, the calling terminal device can know the timing when the called terminal device becomes ready for facsimile communication.

Further, the invention corresponding to claim (2) further provides that when the calling terminal device receives time information from the called terminal device together with information notifying that facsimile communication is disabled, it determines the re-calling time based on the time information, and the re-calling time is determined based on the time information. The purpose of this method is to re-call the called terminal device based on the call time.

[Example code] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a communication terminal device, in which 1 is a terminal control unit equipped with a microprocessor, and 2 is a ROM (read-only) that stores program data and the like for the terminal control unit 1 to control various parts. 3 is a RAM that stores various data such as one-touch dial number information, etc.
(Random access memory), 4 is a key input section for inputting destination dial numbers, etc., 5 is a display section for displaying information such as dial numbers and messages to the operator, and 6 is a voice communication section. 7 is a facsimile control unit for facsimile communication, and 8 is a line control unit that serves as an interface for connecting to the 15DN.

The terminal control unit 1, ROM 2, RAM 3, key power unit 4
, the display section 5 and each control section 6, 7.8 are electrically connected via a pass line 9.

The facsimile control section 7 includes a reading control section 71 that optically reads a document, and a printing control section 72 that prints out the document data sent from the INDS and prints out the document data read by the reading control section 71. , an encoding/decoding control section 73 connected to the reading control section 71 and the printing control section 72 and encoding and decoding data;
It is comprised of a memory control section 74 that temporarily stores transmitted document information and received document information.

Figure 2 shows a case where the calling terminal device (A) sets up a call for facsimile communication, but the called terminal device (B) is busy communicating with another device. In the communication sequence, the terminal device (A) first transmits a call setup message using the D channel, which is a signaling channel.

When the terminal device (B) receives the call setting message, it does not immediately reject the call, but calculates and predicts how long it will take to release the current busy state. For example, if the original to be transmitted is read in advance by the reading control section 71 and stored in the memory control section 74, it is possible to know whether the same page is to be transmitted, and therefore it is possible to predict the time required for transmission. Furthermore, if the transmission document information stored in the memory control section 74 is encoded data, the amount of transmission data can be detected accurately, and the time required for transmission can be predicted more accurately.

Then, the time information (code) obtained by the calculation is set in the user information area of the paging message along with "busy state", and the paging message is transmitted to the terminal device (A) using the D channel.

The terminal device (A) which has received the paging message from the terminal device (B) searches the user/user information area, and if there is information indicating "busy state", it searches for information on the next time when the message can be received. If there is time information, that time information is set as a time parameter for waiting for redial time. If there is no time information, preset time information for redial is set as the redial time waiting time parameter.

It then sends a "disconnect" message to disconnect the "call."

When the terminal device (B) receives the "disconnect" message,
Release the "call" by sending a "release" message.

Thereafter, the terminal device (A) enters a state of waiting for a re-calling time based on the value of the time parameter set earlier.

Eventually, the terminal device (B) is released from the busy state and enters the idle state.

On the other hand, when the setting time has elapsed, the terminal device (A) again sets up a call to the terminal device (B).

When the terminal device (B) receives the "call setup" message,
At this time, the busy state has already been released, so the call setup is accepted and a "response" message is sent to the terminal device (A).

When the terminal device (A) receives the response message, the terminal device (A) confirms the response, then reads the transmission document information from the memory of the memory control unit 74 and transmits it to the terminal device (B).

When the terminal device (A) finishes transmitting the document information, it disconnects the line and clears the document information from its memory.

In this embodiment with such a configuration, the terminal device (A)
When transmitting document information from a terminal device (B) to a terminal device (B) by facsimile communication, if the terminal device (B) is busy communicating with another device, the terminal device (B) will not receive a call from the terminal device (A). Calculate and predict how long the current busy state will last without rejecting the message, and set the predicted time information, for example 10 minutes, in the user area of the call message along with the "busy state". Send to the terminal device (A).

As a result, the terminal device (A) sets the received time information (10 minutes) as the time parameter of the redial waiting time.

In this way, the terminal device (A) starts waiting for redialing based on the set time parameter.

After a predetermined period of time has elapsed, the terminal device (B) ends communication with others and enters an idle state.

On the other hand, the terminal device (A) sets up a call to the terminal device (B) again after the time based on the set time parameter, that is, 10 minutes, has elapsed. At this time, the terminal device (B) has already been released from the busy state, so it accepts the call setup,
Sends a "response" message to the terminal device (A).

After confirming the response, the terminal device (A) reads the transmission document information from the memory of the memory control unit 74 and transmits it to the terminal device (B).

When the terminal device (^) finishes transmitting the document information, it disconnects the line and clears the document information from its memory.

When a call is set up from a terminal device (A) to a terminal device (B) in this way, if the terminal device (B) is in a busy state, the terminal device (B) determines how long it will remain busy. By calculating and transmitting the time information to the terminal device (A), the terminal device (A) can set up the call again to the terminal device (B) after the time has elapsed. At the time of call setup, the terminal device (B) is definitely in the busy state or released. Therefore, communication can be reliably established by setting up a second call, smoothing the start of communication after a busy period, and improving communication efficiency.

In addition, the terminal device (A) sets the time information received from the terminal device (B) to the time parameter of the redial waiting time and waits for redial, so when the busy state of the terminal device (B) is released, the terminal device Inconveniences such as device (A) being in a busy state do not occur.

[Effects of the Invention] As described in detail above, according to the present invention, when the called terminal device is in a facsimile communication disabled state when a call is set up from the calling terminal device, how long does it take for the called terminal device to communicate with the calling terminal device? It is possible to provide a communication method for a communication terminal device that can notify whether it becomes communicable after the lapse of time, and therefore allows the calling terminal device to reliably know the timing when the called terminal device becomes communicable. It is.

Further, according to the present invention, the calling terminal device re-calls at the timing when the called terminal device becomes ready for communication, thereby
It is possible to provide a communication system for a communication terminal device that allows smooth start of facsimile communication between a calling terminal device and a called terminal device after a communication failure state, and improves communication efficiency.

[Brief explanation of drawings]

1 and 2 show embodiments of the present invention.
The figure is a block diagram. Figure 2 is a diagram showing the communication sequence when the called party's terminal device (B) is in a busy state. Figure 3 is a diagram showing the communication sequence when the called party's terminal device (B) is in a busy state. FIG. 2 is a diagram illustrating a conventional communication sequence when. 1...Terminal control unit, 2...ROM (read only memory), 7.
...Facsimile control section, 74...Memory control section.

Claims (2)

[Claims] (1) When performing facsimile communication from a calling terminal device to a called terminal device via an integrated service digital network, if the called terminal device is in a facsimile communication disabled state when receiving a call from the calling terminal device, It is characterized by calculating the time from when an incoming call is accepted until a facsimile communication becomes possible, and transmitting the calculated result to the calling terminal device together with information indicating that facsimile communication is not possible, and disconnecting the line. Communication method for communication terminal equipment. (2) When performing facsimile communication from a calling terminal device to a called terminal device via an integrated service digital network, if the called terminal device is in a state where facsimile communication is not possible when receiving a call from the calling terminal device, Once the incoming call is accepted, the time required for facsimile communication to become available is calculated, the calculated result is sent to the calling terminal device along with information informing that facsimile communication is disabled, the line is disconnected, and the calling terminal device When the device receives time information together with information notifying that facsimile communication is disabled from the called terminal device, the device determines a re-calling time based on the time information, and re-calls the called terminal device based on the re-calling time. A communication method for a communication terminal device characterized by: