JPH0736579B2 - Recall control device for communication device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a communication device such as a facsimile device, and more particularly to a recalling control device thereof.

(Prior Art) In a communication device such as a conventional facsimile device, in the re-call control, when a call cannot be connected due to a busy state on the network side, a busy state on the terminal side, or a failure,
Regardless of the reason (cause), only the fact that the call cannot be connected is detected, and the call is reissued after a certain time.

Generally, the call loss rate caused by the network side is set to 0.1 or less based on the communication traffic volume, and the probability of establishing a call with the partner device is very high even if a call is reissued in a short time. Also, in the case of a call loss due to the local operation of the partner terminal, depending on the processing contents on the receiving terminal side (for example, the operator interrupted the local operation, or the device side automatically interrupted the local operation), There is a high probability that a call will be established even if a call is reissued in a short time.

On the other hand, in the case where the partner terminal does not accept the call for a long time due to a failure or the like, the probability of call loss is high at the time of the call again unless a certain time interval is set.

As described above, in the conventional method, it is not the most appropriate call control in view of the fact that an incoming call from another device cannot be accepted when a call is made.

(Problems to be Solved by the Invention) The present invention relates to a communication device such as a facsimile device when a call cannot be connected due to a partner device or a network.
It is an object of the present invention to eliminate the drawbacks of the conventional device that controls the recalling after a certain time regardless of the reason for the call loss.

That is, it is an object of the present invention to provide a device for eliminating unnecessary call recall control by controlling the time interval of call recall and the number of call originations depending on the reason of a call loss and improving communication efficiency.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention calls a designated partner device, and when the transmission to the partner device is undelivered, a re-call is made a predetermined number of times. In the re-call control device of the communication device to be attempted, when the call to the partner device is made, a detection means for detecting the call connection information returned from the line network, and the transmission failure due to the call connection information detected by the detection means Identification means for identifying the cause of the call, and changing the time interval of the re-call according to the cause identified by the identification means, and if the cause of non-delivery is of persistent nature, Recall control means for stopping the call.

(Operation) From the response information, the present invention identifies whether the reason why the call connection could not be established is network busy, the local operation of the partner device, or the malfunction of the partner device.
The call control data such as the recall timer and recall counter are set to the most appropriate values according to each, and the time interval and the number of recalls or the stoppage of the recall are appropriately controlled. Recall control can be performed.

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

FIG. 1 is a block diagram of an embodiment of the present invention. Reference numeral 1 is a network control unit for monitoring processing related to disconnection of a call from the network and network status during communication, 2 is a central processing unit (CPU) for controlling device status, communication processing, etc. 3 is various times controlled by the CPU A time monitoring timer that is a monitoring timer that constantly outputs an interrupt signal to the CPU in a constant cycle, and 4 is a call control data memory that stores call control data.

As shown in FIG. 2, the call control data memory 4 includes a recall call flag indicating whether the recall call timer is operating (ON) or not (OFF), and a recall call indicating the number of times of recall calls. Counter, Recalling timer indicating the time until recalling (set a value obtained by dividing the predetermined time by the value of the time monitoring timer 3 when setting the time, and subtracted when the time monitoring timer 3 interrupts), the other party The device selection number and the like are stored.

The operation of the embodiment having the above configuration will be described with reference to the operation flow chart shown in FIG.

(1) The CPU 2 starts a calling operation by an operator's operation, time designation, or the like.

(2) The contents of the call control data memory 4 are cleared (initialized).

(3) It is detected whether or not the recalling flag is ON, and if it is ON, it is determined whether or not the content of the recalling timer is 0, and the next calling operation is started. When the content of the recalling timer is 0 (B), this flow also starts during recalling control.
Checking the flag.

(4) The CPU 2 outputs the partner selection number to the network control unit 1 and instructs the network control unit 1 to start calling control.

(5) The response monitoring timer in the time monitoring timer 3 is started in order to monitor the response of the network (disconnect the call when there is no response for a certain period of time).

The network control unit 1 performs processing indicating that the network is a calling operation, and then converts the partner selection signal received from the CPU 2 into a signal suitable for the network and outputs the signal.

(6) Response information processing (i) The response information from the network is monitored, and if the response information is information indicating that the call has been established, data transmission / reception is started by jumping to a data communication control flow (not shown).

(Ii) If the response indicates that the call has not been established, the recalling timer of the call control data memory 4 is set to _{one of the} recalling timer values l _{1 to} ln that are predetermined according to the content of the response information. .

l _{1 to} ln: The timer value is a value obtained by dividing a predetermined time by the value of the constant period of the time monitoring timer 3, and is sequentially decreased by an interrupt generated at every constant period.

Similarly, the number of detection times n _{1 to} nn weighted to each predetermined response information is added to the recalling counter of the call control data memory 4.

n _{1 to} nn: Weighted by response information (for example, n ₁ = 1 and n ₂
= 2).

When the response information indicates that the call cannot be established even if the call is reissued such as changing the other party's number, the flow jumps to a failure processing flow not shown.

(Iii) Next, the recalling flag of the call control data memory 4 is turned on to indicate that the timer for recalling is operating.

(Iv) If the recalling counter of the call control data memory 4 is greater than a predetermined number N of calls, the procedure goes to the failure flow, and if it is less than N, the procedure goes to the procedure (B).

In this embodiment, as shown in the above operation, from the response information,
The reason why the call connection could not be established is whether the network is busy, the remote device is operating locally, or the remote device is faulty. Since it is set to the most appropriate value and the time interval and the number of re-calls or the stop of re-calls are appropriately controlled, efficient re-call control can be performed.

(Effects of the Invention) As is apparent from the above description, the present invention can set an optimal time until a call is re-established, and can set the number of re-calls, so that an efficient call operation can be performed. Can be done.

Further, according to the present invention, by effectively performing the calling operation as described above, the calling / receiving operation (including the sending and receiving operations) is performed.
In the device capable of performing the above-mentioned operation, a more effective result can be obtained by reducing the busy state (due to the recall operation) of the own terminal.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a diagram showing the contents of a call control data memory, and FIG. 3 is an operation flow chart of this embodiment. 1 ... Network control unit, 2 ... CPU, 3 ... Time monitoring timer, 4 ... Call control data memory.

Claims (1)

[Claims] 1. When a call is made to a designated partner device and transmission to the partner device is unsuccessful, a call origination control device of the communication device of the communication device attempts to make a call again a predetermined number of times. Detecting means for detecting call connection information returned from the line network at the time of call, identifying means for identifying the cause of non-delivery based on the call connection information detected by the detecting means, and the identifying means for identifying It is characterized by having a re-call control means for changing the time interval of re-call according to the cause and stopping the re-call when the cause of non-delivery of transmission has a persistent nature. Recall control device of communication device.