JPH084283B2 - Communication network control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a communication network control method, and particularly in telephone communication or the like, in the case where a called party responds immediately after the calling party cuts off the call from a calling state. However, the present invention relates to a communication network control system that establishes communication.

[Conventional technology]

Conventionally, as an inconvenient case that is frequently experienced in a telephone switching network, etc., the caller called the called party at a certain time, but since the called party does not answer, it happens that immediately after giving up the call and going on-hook. The callee may have answered at that point. In such a case, the callee wastes effort because the communication is not established even though the callee answers the incoming call. Also, for the caller, if the call was continued for a short time, the caller could not communicate with the callee, but the caller had to call the same person again. After all, the procedure is wasted.

[Problems to be solved by the invention]

As described above, in the conventional telephone switching network, if the called party answers the call immediately after the caller hangs up the call while the call is in progress, communication cannot be performed as it is and the call is made again. There was an increase in wasted effort and waste of order. In the conventional communication network, effective countermeasures against this kind of problem have not been taken, which is one of the factors that hinder the improvement of the communication completion rate.

The object of the present invention is to remedy such a problem, and even when the called party answers immediately after the calling party gives up the call,
It is to provide a communication network control method that establishes communication and improves the communication completion rate.

[Means for solving problems]

In order to achieve the above object, the communication network control system of the present invention comprises: (a) a calling side exchange 2 equipped with means (control circuit 2c) for transmitting the number information of the calling terminal 1 to the destination exchange 3 at the time of calling; , A storage means (control circuit 3c) for accumulating the number information of the calling terminal 1, and when the calling terminal 1 interrupts the call while the receiving terminal 4 is calling, a predetermined time from the time when the interruption is recognized. Response detecting means (subscriber circuit 3b) for detecting the case where the receiving terminal 4 answers the call
And a call return means (control circuit 3c, re-call state notification circuit 3d) which is activated by detection of the response detection means (subscriber circuit 3b) and calls the originating terminal 1 This destination exchange 3 has a receiving terminal 4 within a predetermined time after the calling of the calling terminal 1 is interrupted.
Response is detected by the response detecting means (subscriber circuit 3b), the response detecting means (subscriber circuit 3b) is detected.
3b) activates the calling means (control circuit 3c, recall state notification circuit 3d), and this call back means (control circuit 3c, recall state notification circuit 3d) stores means (control circuit 3c). It is characterized in that the call back is executed to the calling terminal 1 according to the number information of the calling terminal 1 stored in the above.

Further, (b) when the calling terminal 1 interrupts the call while the calling terminal 4 is calling the storage means (control circuit 3c) for storing the number information of the calling terminal 1 of the calling source, the interruption is recognized. Response detection means (subscriber circuit 2b) for detecting the case where the receiving terminal 4 responds to the call within a predetermined time from the time point, and the call is activated by the detection of the response detection means (subscriber circuit 2b). Call-back means for calling the terminal 1 (control circuit 3c, re-call state notification circuit 3d)
The exchange 7 is provided with the
If the receiving terminal 4 responds within a predetermined time after the call is interrupted by the caller, the response detecting means (subscriber circuit 2
This response is detected by b), and by the response detection means (subscriber circuit 2b), the call back means (control circuit 3
c, the recalling state notifying circuit 3d) is activated, and this call back means (control circuit 3c, recalling state notifying circuit 3d) uses this calling terminal according to the number information of the calling terminal 1 stored in the storing means (control circuit 3c). 1 is called back.

[Action]

In the present invention, when the caller gives up the call to the callee immediately after the caller gives up, the caller is called from the switching network which accommodates both terminals, more specifically, from the destination exchange. By connecting, the notification path once disconnected is immediately restored to establish communication. This can increase the probability that communication will be established.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of a communication network showing an embodiment of the present invention.

In FIG. 1, 1 is a calling side terminal (telephone), 2 is a calling side switch, 2a is a calling side path switch, 2b is a calling side subscriber circuit, and 2c is a number of the calling side terminal, and is notified to the called side switching device. At the same time, a control circuit of the originating exchange that receives a recall signal from the terminating exchange and performs control for calling the originating terminal 1, 2d
Is a recalling trunk of the originating exchange that sends a ringing bell to the originating terminal 1, 3 is a destination exchange, 3a is a destination communication line switch, 3b is a destination subscriber circuit, and 3c is a originating exchange. The control circuit of the terminating exchange that stores the number of the calling terminal notified from the terminal and activates the recalling of the calling terminal, 3d
Is a recalling state notification circuit for notifying the called party that the calling party is being called back, 4 is a receiving side terminal (telephone), 5 is a communication path between the originating side exchange 2 and the receiving side exchange 3. Is a common line used when a call control signal is transmitted between the originating exchange 2 and the terminating exchange 3.

Now, a case where the calling terminal 1 makes a call to the receiving terminal 4 will be described. When the originating exchange 2 detects a call from the originating terminal 1, the control circuit 2c is activated to transfer an incoming signal to the control circuit 3c of the destination exchange 3 via the common line 6. The incoming signal includes the called-side terminal number information and the calling-side terminal number information. In the destination exchange 3, the operation of the re-call state notification circuit 3d sends a bell ringing signal (a ringing signal) to the destination terminal 4 and a ring back tone (a ringing tone) to the originating terminal 1. They are generated and sent out via the communication path switch 3a. The bell ringing signal is
The ringback tone is transferred to the terminal 4 through the call path switch 3a, the subscriber circuit 3b, and the subscriber line.
It is returned to the calling terminal 1 through a, the line 5, the speech path switch 2a, the subscriber circuit 2b, and the subscriber line. The above is the operation in the calling state.

In this state, the case where the response of the receiving terminal 4 is delayed for some reason and the subscriber of the transmitting terminal 1 abandons this call will be described. When the subscriber of the calling terminal 1 hooks the telephone, the loop of the subscriber line is disconnected. The subscriber circuit 2b detects the subscriber line loop break and notifies the control circuit 2c of this, so that the control circuit 2c recognizes the call interruption. The control circuit 2c informs that the calling of the calling terminal 1 is interrupted via the common line 6 by the control circuit 3c of the destination exchange 3.
To notify. In the destination exchange 3, the control circuit 3c is
When this signal is received, the recalled state notification circuit 3d is activated to stop the bell ringing signal sent to the receiving terminal 4 and also stop the ringback tone sent to the sending terminal 1. At the same time, the control circuit 3c
Instructs the subscriber circuit 3b to monitor whether the receiving terminal 4 responds. The subscriber circuit 3b monitors the terminating terminal 4, and if the terminating terminal 4 does not respond within a predetermined time, the call is stopped as it is. Also,
When the receiving terminal 4 responds within a predetermined time, that is, at a time shortly after the stop of the bell ringing signal, this response operation is detected in the subscriber circuit 3b as the generation of a subscriber line loop.

For example, in the telephone network, 1 to several seconds are appropriate for the above-mentioned called party response monitoring time by the subscriber circuit 3b, based on research and experience. When setting the monitoring time timer, if the setting time is too short, the effect of the present invention is not sufficiently exerted, and if it is too long, the on-hook performed by the receiving terminal 4 for another communication is detected. However, since this is erroneously determined as the response immediately after the disconnection, the convenience for the receiving terminal 4 becomes worse.

When the subscriber circuit 3b detects that the receiving terminal 4 has answered the call shortly after the call is terminated, this information is reported to the control circuit 3c. The control circuit 3c activates the recalling state notification circuit 3d to notify the receiving terminal 4 that the calling terminal 1 is called back, and at the same time, makes a call to the calling terminal 1.

It is desirable that the information generated by the control circuit 3c be information that can be easily recognized, such as a talkie voice notifying that the call is being returned or a special tone signal that is a combination of audible frequencies. The transmission signal from the control circuit 3c is sent via the common line 6 to the control circuit 2c of the originating exchange 2.
Then, the control circuit 2c controls the calling of the calling terminal 1 in the same manner as a normal incoming call. At this time, the ring back tone returned by the receiving terminal 4 is the destination exchange 3
It is desirable to mix it with the call back notification information by the recall status notification circuit 3d and deliver it to the receiving terminal 4.

In this way, when the originating terminal 1 responds to the call back, the originating exchange 2 sets a call path via the interoffice line 5 and the originating terminal 1 sends the call to the destination exchange 3.
Is notified and the operation of the recalling state notification circuit in the destination exchange 3 is stopped, the calling terminal 1 and the receiving terminal 4 can talk.

In this case, in order to prevent the subscriber of the calling terminal 1 from being confused with a normal incoming call, the calling terminal and the terminal 4
At the time of connecting and, if you use the recall status notification circuit 3d and notify the calling terminal 1 with a message such as "I will connect with the called party" and a talkie etc., Serviceability can be further improved.

In this way, immediately after the call is terminated, the receiving terminal 4
Even when is answered, it becomes possible to talk with the calling terminal 1.

It should be noted that, even when the receiving terminal 4 responds to this immediately after the receiving terminal 4 gives up and terminates the call during call back,
By applying the present invention, it is also possible to call back the called terminal 4 and send a ringback tone to the calling terminal 1.

In the present embodiment, each switching system is newly provided with control circuits 2c and 3c. In the case of a digital switching system or an electronic switching system, this is because a conventional trunk circuit contains a microprocessor and is automatically called back by program control. Can be performed, and even in the case of a crossbar exchange, it can be performed only by adding a number register for accumulating number information for a short time. In addition to the conventional functions, the subscriber circuits 2b and 3b also need to be provided with a response monitoring function of the receiving terminal for a predetermined time after the other party disconnects, but this is also program controlled. It is possible.

FIG. 2 is a flowchart of the operation in FIG. First, go off-hook at the calling terminal (step 1
1) The calling exchange detects a call (step 22) and sends an incoming signal including the called terminal number information to the called exchange (step 23). When the destination exchange receives each number information of the called terminal and the called terminal (step 31), the calling terminal number is temporarily stored in the memory (step 32), and a call signal is sent to the called terminal (step 33). Send a ringback tone to the calling terminal (step 3
Four). When calling is interrupted at the calling terminal (step 1
2) Then, the originating exchange detects the interruption (step 24) and notifies the destination exchange of the interruption (step 25). The destination exchange stops sending the ringing signal and ringback tone (step 35) and monitors the response of the receiving terminal for a predetermined time (step 36). When the receiving terminal receives a response within the scheduled time (step 51), the response is detected (step 37), the call back is activated, and the ring back tone is returned to the receiving terminal (step 39). The calling exchange sends a call signal to the calling terminal in the same manner as a normal call (step 26). If the calling terminal responds to this (step 13), a path to the called exchange is set (step 27). ), And notifies the destination exchange of the response of the calling terminal (step 28). When the destination exchange receives this, it stops transmission of the call back signal and ring back tone (step 40) and connects the receiving terminal and the calling terminal to enable a call between the two.

In the embodiment, the case where the originating terminal and the terminating terminal are accommodated in the different originating and terminating exchanges 2 and 3 has been described. However, both the originating terminal and the terminating terminal are accommodated in the same exchange. In this case, since the control circuits 2c and 3c need only be one circuit, the function of transferring the number information of the calling terminal to the called side is unnecessary.

FIG. 3 is a block diagram of a communication network in which a calling terminal and a called terminal are accommodated in the same exchange 7, as another embodiment of the present invention. All the symbols in FIG. 3 are the same as those shown in FIG. 1, and the same symbols represent the same circuits. Since the operation is exactly the same as that in FIG. 1, the description is omitted.

As described above, in this embodiment, when the called terminal answers immediately after the calling terminal stops calling, the called exchange automatically returns the call to the calling terminal, so that the calling terminal If you respond, you can connect to the called terminal and let them communicate.

〔The invention's effect〕

As described above, according to the present invention, the response of the called party immediately after the calling party gives up the call can be relieved, and the parties involved in the communication are less likely to redial and receive, and the serviceability is improved. . Further, since the number of incomplete calls in the communication network is reduced, there is an advantage that the invalid holding of the communication equipment is reduced and the effective use of the equipment is promoted.

[Brief description of drawings]

FIG. 1 is an overall block diagram of a communication network showing an embodiment of the present invention, FIG. 2 is an operation flowchart of FIG. 1, and FIG. 3 is an overall block diagram of a communication network showing another embodiment of the present invention. . 1: Calling terminal, 2: Calling side exchange, 3: Calling side exchange, 2a, 3a: Speech path switch, 2b, 3b: Subscriber circuit, 2c, 3c: Control circuit, 2d:
Recall trunk, 3d: Recall status notification circuit, 4: Receiving terminal, 5: Interoffice line, 6: Common line, 7: Switch.

Claims (2)

[Claims] 1. A calling terminal accommodating exchange comprising means for sending out the number information of the originating terminal to the exchanging terminal accommodating exchange when making a call,
And storage means for accumulating number information of the calling terminal, and when the calling terminal interrupts the call while the called terminal is calling, the called terminal within a predetermined time from the time when the interruption is recognized. Has a receiving terminal accommodating switch equipped with a response detecting means for detecting a case of responding to the call, and a call back means activated by the detection of the response detecting means for making a call to the originating terminal, The receiving terminal accommodation switch detects the response by the response detecting means when the receiving terminal responds within the predetermined time after the calling is interrupted by the transmitting terminal, and the response detecting means detects the response. In response to the notification, the call back means is activated, and the call back means executes the call back to the calling terminal according to the number information of the calling terminal stored in the storing means. 2. A storing means for accumulating number information of a calling terminal as a calling source, and a predetermined state from the time when the calling terminal recognizes the interruption when the calling terminal interrupts the calling while the receiving terminal is calling. An originating and terminating terminal provided with a response detecting means for detecting a case where the called terminal responds to the call within a time, and a call returning means which is activated by the detection of the response detecting means and makes a call to the calling terminal. If the receiving terminal responds within the predetermined time after the calling terminal interrupts the call, the receiving and sending terminal accommodating switch has the accommodating exchange, and the response detecting means sends the response. It is detected that the call return means is activated by the notification from the response detection means, and the call return means executes the call return to the call origination terminal according to the number information of the call origination terminal stored in the storage means. Communication network control system to be.