JPH0758843A - Private automatic exchange system - Google Patents

Abstract

PURPOSE:To preserve a channel even when a telephone line is physically broken during holding and to eliminate the need for redialing after line restoration. CONSTITUTION:A communication control procedure execute section 41 of a digital telephone set interface 4A detects a communication error, a timer management section 45 measures an elapsed time after the communication error is detected, and when number of times of communication errors measured by a number of time measurement section 46 exceeds a preset number of times for a predetermined time, it is discriminated that the line between the private automatic exchange 1 and digital telephone sets 6A, 6B is physically broken. Then the line of a communication opposite party whose line is interrupted is connected to a message transmission section 7, the elapsed time after the connection is measured by the timer management section 45 and when the line is restored till a predetermined time, the channel state before the line fault state is recovered to control restart of speech. Furthermore, when the line is not restored till a predetermined time, as soon as the line is restored, it is reported to the communication opposite party by using a sound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private automatic exchange system used in a premises such as a business office. While the line is on hold, even if the line is physically cut off, the call can be resumed and the call can be restarted. It was designed so that it was not necessary.

[0002]

2. Description of the Related Art In a digital telephone, unlike a conventional key telephone, a call state is maintained by data communication with an extension interface, and the end of the data communication is regarded as the end of the call. FIG. 4 is a block diagram showing a configuration example of a conventional private automatic exchange system, showing an example in which two digital telephones are accommodated.

In FIG. 4, reference numeral 1 denotes a private automatic branch exchange, which is a speech path switch unit 2 forming a speech path for each line,
An outside line interface 3 that accommodates an outside line 9 and performs control such as bell detection from the outside line 9, line capture, and dial information transmission.
, Digital telephone interfaces 4A and 4B connected to the digital telephones 6A and 6B, and a control unit 5 for controlling each part of the private automatic branch exchange 1 and controlling exchange connection operation.
And

The digital telephone interface 4A
(Since the digital telephone interface 4B has the same configuration, each part in the frame is omitted.) The data is checked when the signal is exchanged with the digital telephone 6A,
A communication control procedure execution unit 41 that executes a communication control procedure such as detecting a communication error and normal communication and sending a data resend request, a transmission / reception unit 42 that sends and receives data, and controls each unit of the digital telephone interface. It comprises an interface control unit 43 and a power supply unit 44 for supplying power to the digital telephone 6A.

Further, the digital telephone 6A (since the digital telephone 6B has the same configuration, each portion in the frame is omitted), the digital telephone interface 4A includes a communication control procedure executing unit 41 and a transmitting / receiving unit 42, A communication control procedure execution unit 61 and a transmission / reception unit 62 having almost the same functions,
A microphone 63, a speaker 64, and an audio interface 65 that converts an analog signal into a digital signal or a digital signal into an analog signal and adjusts the gain of the audio signal sent from the microphone 63 and the audio signal output to the speaker 64. , A digital telephone control unit 66 for controlling each unit of the digital telephone 6A, and the digital telephone 6
The power supply unit 67 supplies power to each unit of A.

The operation of the private automatic exchange system configured as described above will be described. When a call is made from the digital telephone 6A, the digital telephone interface 4A is used.
The calling information is sent from the interface control unit 43 to the control unit 5. The control unit 5 confirms that the digital telephone 6B is unused, and the communication path between the communication path switch unit 2 and the digital telephone interface 4B and the communication path between the communication path switch unit 2 and the digital telephone interface 4A are unused. After confirming that, the digital telephone interface 4B is instructed to call the digital telephone 6B.

The digital telephone 6B is called by an instruction from the digital telephone interface 4B. When the called party goes off-hook on the digital telephone 6B, the controller 5 gives an instruction to capture the digital telephone interface 4B, and the digital telephone interface 4
A signal requesting a connection between A and the digital telephone interface 4B is sent to the communication path switch unit 2. Based on the signal from the control unit 5, the call path switch unit 2 connects the caller side digital telephone interface 4A and the callee side digital telephone interface 4B, and the caller side digital telephone 6A is connected. A voice communication path with the called party's digital telephone 6B is formed.

If the line between the digital telephone 6A and the digital telephone interface 4A is disconnected while the digital telephone 6A is on hold, it is considered that the call has ended, and the digital telephone interface is instructed by a command from the control unit 5. The communication path between 4A and the digital telephone interface 4B is disconnected by the communication path switch unit 2.

Also, if the line between the digital telephone 6A and the digital telephone interface 4A is disconnected while the digital telephone 6B is on hold, it is considered that the call is ended, and the digital telephone interface 4A is instructed by the instruction from the control unit 5. The call path between the and the digital telephone interface 4B is disconnected by the call path switch unit 2. Therefore, if the telephone cord of the modular jack type used to connect the digital telephone interface to the digital telephone is disconnected while the call is on hold, the call will be interrupted.

[0010]

In the above-described conventional private automatic exchange system, if the line between the digital telephone and the digital telephone interface is disconnected during the holding, the communication path state is restored even if the connection is made again. There was a problem in that it was not possible to do so, and the other party was bothered and it was necessary to call again. Therefore,
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a private automatic exchange system capable of restoring a call state when a line between a digital telephone and a digital telephone interface is restored.

[0011]

In order to achieve the above-mentioned object, the present invention provides a digital telephone interface of a private automatic branch exchange which accommodates a plurality of digital telephones, and a communication control procedure executing section. The number of communication errors and the number of normal communications for which normal communication is judged to be possible, the time elapsed after the communication error due to the line disconnection was detected, and the data resend request was sent to the digital telephone. Various elapsed times such as the elapsed time from the start, the time from the detection of normal communication due to the line restoration, the time from the connection of the line on the other side of the call to the message sending part described later, and the time up. It has a timer management unit that can set the time arbitrarily and has various time management functions. Characterized in that it has a message transmitting section for transmitting a message such effect became temporarily call impossible because, the tone generator unit for delivering a sound such as effect the line is restored.

A second aspect of the present invention is the number of times the communication control procedure execution unit measures the number of communication errors and the number of normal communications judged to be possible for a normal telephone call in a plurality of digital telephones accommodated in a private automatic branch exchange. Section, the time elapsed since the communication error due to the line disconnection was detected, the time elapsed after the data retransmission request was sent to the digital telephone, the time elapsed after the normal communication due to the line restoration was detected, and the call. It has various elapsed times such as the elapsed time after connecting the other party's line to the message sending section to be described later and a timer management section having various time management functions that can arbitrarily set the time until the time up, If the line is considered to be abnormal by the means, a message sending unit for sending a message to the other party's line indicating that the call is temporarily disabled for some reason, and the line. Characterized in that it has a tone generator for delivering the sound, such as the restored effect.

[0013]

According to the present invention, in the above configuration, the communication control procedure execution unit included in the digital telephone interface or the digital telephone detects a communication error, and the timer management unit measures the elapsed time from the detection of the communication error. If the number of communication errors measured by the number-of-times measuring unit exceeds the number set in advance for a certain period of time, it is determined that the line between the private automatic branch exchange and the digital telephone is physically disconnected, Connect the line on the other end of the line on the disconnected side to the message sending unit, measure the elapsed time after connecting the other party on the call side and the message sending unit with the timer management unit, and the line is restored by the predetermined time In this case, the call path state before the line abnormality state is recovered and control is performed so that the call can be resumed. If the line is not restored within a predetermined time, the other party is notified by sound as soon as the line is restored. As a result, for example, even if the telephone cord or the like is pulled out for moving while being held and the line is disconnected, the telephone cord or the like can be connected to the digital telephone again to restart the call, and it is not necessary to call again.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the construction of a private automatic exchange system in an embodiment of the first invention, showing an example in which two digital telephones are accommodated. In FIG. 1, blocks of the same constituent elements as those in FIG. 4 of the conventional example are designated by the same reference numerals, and description thereof will be omitted.

Reference numeral 7 is a message transmission unit for transmitting a message indicating that the line has been disconnected, 8 is a tone generation unit for transmitting a holding tone and various tones, and 45 is a communication control procedure execution unit 41 for a communication error or A timer management unit capable of setting an arbitrary time by measuring an elapsed time after detection of normal communication, an elapsed time after sending a data retransmission request to a digital telephone, and a communication control procedure execution unit 46. The number of times of normal communication and the number of communication errors detected in 41 can be measured, and an arbitrary number of times can be set.

FIG. 3 is a flow chart of FIG. 1 and a flow chart of FIG. 2 which will be described later, showing the processing procedure from the detection of the line abnormality to the shift to the call-enabled state again, which will be described below.

When a call is made from the digital telephone 6A to the digital telephone 6B, the interface control unit 43 of the digital telephone interface 4A sends the call information to the control unit 5. Further, the control unit 5 confirms that the digital telephone 6B is not used, and confirms that the communication path between the speech path switch unit 2 and the digital telephone interface 4B and the speech path between the speech path switch unit 2 and the digital telephone interface 4A. After confirming that it is unused, the digital telephone interface 4B is instructed to call the digital telephone 6B.

The digital telephone 6B is called by an instruction from the digital telephone interface 4B. When the digital telephone 6B on the called side goes off-hook, the control unit 5 gives an instruction to capture the digital telephone interface 4B, and sends a signal requesting a connection between the digital telephone interface 4A and the digital telephone interface 4B. It is sent to the part 2. Based on the signal from the control unit 5, the call path switch unit 2 connects the caller side digital telephone interface 4A and the callee side digital telephone interface 4B, and the caller side digital telephone 6A is connected. A voice communication path with the called party's digital telephone 6B is formed.

The above operation is the same as in the conventional case of FIG.

When the digital telephone 6A is put on hold, the controller 5 sends a signal requesting the connection between the digital telephone interface 4B and the tone generator 8 to the speech path switch 2. The communication path switch unit 2 connects the digital telephone interface 4B and the tone generation unit 8 based on the signal from the control unit 5, and the hold tone is sent to the digital telephone 6B.

During this hold state, the digital telephone 6A
Or for accidentally disconnecting the line between the digital telephone interface 4A and the digital telephone 6A (pulling out a modular jack type telephone cord that is often used for the line between the digital telephone interface and the digital telephone), The line between the transmitter / receiver 42 of the digital telephone interface 4A and the transmitter / receiver 62 of the digital telephone 6A is disconnected. When disconnected, the communication control procedure execution unit 41 detects a communication error (S1), and the number of times measurement unit 46 measures the number of communication errors.

Further, the timer management unit 45 measures the time elapsed after the communication error is detected. Although the communication control procedure execution unit 41 requests the retransmission of the data (S2), the data is not retransmitted because the line is disconnected (S2).
3). Exceeding the time preset by the timer management unit 45,
When the time is up (S4), or the number of communication errors exceeds the number of times set in advance in the number-of-times measuring unit 46 continuously, and the elapsed time since the detection of the communication error is set in the timer management unit 45 in advance. If you exceed the time
(S5), the interface control unit 43 determines that the line between the digital telephone interface 4A and the digital telephone 6A is abnormal because the call termination procedure is not executed.

The control unit 5 sends a signal requesting a connection between the digital telephone interface 4B and the message sending unit 7 to the speech path switch unit 2. Call path switch unit 2
Connects the digital telephone interface 4B and the message sending unit 7 based on the information sent from the control unit 5, and the message sending unit 7 sends a message stored in advance to the speaker, for example, "A fault occurs in the partner line now. A message such as "Please wait for a while." Is sent (S6) to alleviate the anxiety caused to the caller of the digital telephone 6B on the called side.

The timer management unit 45 measures the elapsed time from the disconnection of the line between the digital telephone 6A and the digital telephone interface 4A. When the time exceeds the preset time (S7), the message is sent. A message stored in advance from the unit 7 to the speaker,
For example, send a message such as "The other party's line is currently out of service. Please hang up and wait. I will call you when connected." (S8) and ask the caller on digital telephone 6B to end the call. Prompt to. If the preset time has not been exceeded, it is determined whether normal communication is possible.

When the line is restored, the communication control procedure execution unit 41
In this case, the number of communication errors decreases and the number of normal communication increases. At this time, when the communication control procedure execution unit 41 detects normal communication, the number of times of normal communication is measured by the number of times measurement unit 46, and the timer management unit 45 measures the elapsed time from the detection of normal communication. If the number of times of normal communication exceeds the number of times set in advance in the number of times measuring section 46 and the elapsed time from the detection of normal communication exceeds the time set in advance in the timer managing section 45, the control section 5 Determines that normal communication is possible between the digital telephone 6A and the digital telephone interface 4A (S9), and if the caller at the digital telephone 6B is not on-hook (S10), the control unit 5
Sends a signal requesting a connection between the digital telephone interface 4B and the tone generator 8 to the communication path switch unit 2.

Based on the signal sent from the control unit 5, the communication path switch unit 2 has a digital telephone interface 4
B and the tone generator 8 are connected. Then, a predetermined hold tone is sent to the digital telephone 6A.
(S11). At this time, the number of times preset in the number of times measuring unit 46 may be a communication error or a normal communication, and the two numbers do not necessarily have to match. Digital telephone 6
When the hold is released at A (S12), the control unit 5 sends a signal requesting a connection between the digital telephone interface 4A and the digital telephone interface 4B to the communication path switch unit 2. Based on the signal from the control unit 5, the communication path switch unit 2 receives the digital telephone interface 4
A and the digital telephone interface 4B are connected, and the call can be resumed (S13).

If the caller on the digital telephone 6B goes on hook (S10) and the talker on the digital telephone 6A releases the hold (S14), the control unit 5 causes the digital telephone interface 4B and the tone generation unit 8 to operate. A signal for requesting the connection is sent to the communication path switch unit 2.

The speech path switch section 2 is based on the signal sent from the control section 5, and the digital telephone interface 4
B and the tone generator 8 are connected. Digital telephone 6
The tone generator 8 sends a special tone to the B indicating that the line on the digital telephone 6A side has been restored (S15). Further, the control unit 5 sends a signal requesting a connection between the digital telephone interface 4A and the message sending unit 7 to the speech path switch unit 2.

Based on the signal sent from the control unit 5, the communication path switch unit 2 uses the digital telephone interface 4
A and the message sending unit 7 are connected. Then, a message stored in the digital telephone 6A is sent from the message sending unit 7 to the speaker, for example, a message such as "The other party's line is disconnected right now. Please wait a while." (S16).
If the speaker on the digital telephone 6B goes off-hook (S1
7), the control unit 5 sends a signal requesting the connection between the digital telephone interface 4A and the digital telephone interface 4B to the speech path switch unit 2. Based on the signal from the control unit 5, the communication path switch unit 2 is connected to the digital telephone interface 4A and the digital telephone interface 4B, and the telephone call can be resumed (S13).

FIG. 2 is a block diagram showing the construction of an automatic premises exchange system in an embodiment of the second invention, showing an example in which two digital telephones are accommodated. In FIG.
Although the blocks having the same components as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, in FIG. 1, each unit newly added to the private automatic branch exchange side is provided on the digital telephone side. .

Reference numeral 68 is a message transmission unit for transmitting a message indicating that the line has been disconnected, 69 is a tone generation unit for transmitting a holding tone and various tones, and 70 is a communication control procedure execution unit 61 for communication errors and A timer management unit that can measure the elapsed time after normal communication is detected, the elapsed time after sending a data resend request to a digital telephone, and set an arbitrary time. Control procedure execution unit
(Here, the number of normal communications and communication errors detected in the communication control procedure execution unit (not shown, hereinafter referred to as communication control procedure execution unit B) of the digital telephone interface 4B is measured, and an arbitrary number is set. It is a possible frequency measuring unit.

In the above-mentioned structure, formation of a voice communication path from the calling side digital telephone 6A to the called side digital telephone 6B or vice versa performs the same operation as in the case of FIG.

Next, the operation of this embodiment will be described with reference to the flow chart of FIG.

When the digital telephone 6B is put on hold, the digital telephone control unit (not shown, hereinafter referred to as digital telephone control unit B) of the digital telephone 6B receives the digital telephone 6B based on a signal from the control unit 5. Tone generator (not shown, digital telephone 6
(Corresponding to the tone generator 69 of A) from the digital telephone 6B
The speaker (not shown, hereinafter referred to as speaker B) is controlled to output the hold sound. If the line between the digital telephone interface 4B and the digital telephone 6B is disconnected during this hold state, the communication control procedure executing section B detects a communication error (S1), and the number of times measuring section 71 counts the number of communication errors. Furthermore, the timer management unit 70 measures the elapsed time since the detection of the communication error.

Although the communication control procedure execution unit B makes a request to retransmit data (S2), the data is not retransmitted (S3) because the line is disconnected. When the timer management unit 70 has timed out beyond the preset time (S4), or the number of communication errors has continuously exceeded the preset number in the frequency measurement unit 71, and a communication error has been detected. If the elapsed time from the time exceeds the time preset by the timer management unit 70 (S5), the control unit 5 has not executed the call termination procedure, and therefore the digital telephone interface 4B.
It is determined that the line between the digital telephone 6B and the digital telephone 6B is abnormal.

Based on the signal sent from the control unit 5, the digital telephone control unit 66 controls the message sending unit 68 to send a message to the speaker 64.
The message sending unit 68 sends a pre-stored message to the speaker 64, for example, a message such as "A fault has occurred in the other party's line. Please wait a while." (S6), and the caller side A digital telephone 6
Try to alleviate the anxiety caused to the A party.

The timer management unit 70 measures the elapsed time from the disconnection of the line between the digital telephone 6B and the digital telephone interface 4B. When the time exceeds the preset time (S7), a message is sent. A message stored in advance from the section 68 to the speaker 64, for example, a message such as "The other party's line is currently unavailable. Please hang up and wait. I will call you when connected" (S8), The caller on the digital telephone 6A is urged to end the call once.

If the preset time has not been exceeded, it is determined whether normal communication is possible. When the line is restored, the number of communication errors in the communication control procedure execution unit B decreases and the number of normal communication increases. At this time, when the communication control procedure execution unit B detects normal communication, the number-of-times measuring unit 71 measures the number of times of normal communication, while the timer management unit 70 measures the elapsed time from the detection of normal communication. . If the number of times of normal communication exceeds the number of times set in advance in the number of times measuring section 71 and the elapsed time from the detection of normal communication exceeds the time set in advance in the timer managing section 70, the control section 5 Is a digital telephone 6B
And the digital telephone interface 4B can be normally communicated with each other (S9), and if the caller of the digital telephone 6A is not on-hook (S10), the digital telephone controller 66 instructs the tone generator 69 to the speaker 64. Then, control is performed so as to output a predetermined hold tone (S11).

At this time, the number of times preset in the number-of-times measuring section 71 may be a communication error or a normal communication, and the two numbers do not necessarily have to match. When the hold is released by the digital telephone 6A (S12), the communication path switch unit 2 receives the digital telephone interface 4A and the digital telephone interface 4 based on the signal from the control unit 5.
The call can be resumed by connecting to B (S13).

If the caller on the digital telephone 6A goes on hook (S10) and the talker on the digital telephone 6B releases the hold (S14), the tone generator 69 is used for the speaker 64 to the digital telephone 6B side. A predetermined special tone indicating that the line has been restored is transmitted (S15). In addition, a message stored in the message transmitting unit 68 of the digital telephone 6B from the message transmitting unit (not shown) on the digital telephone 6B side to the speaker B, for example, "The other party's line has been disconnected. Since it is doing, please wait for a while. "Etc. are sent (S16). When the talker on the digital telephone 6A goes off-hook (S17), the speech path switch unit 2 receives the signal from the control unit 5 and the digital telephone interface 4A
And the digital telephone interface 4B are connected, and the call can be resumed (S13).

In the above example, the telephone call between the digital telephone 6A and the digital telephone 6B is taken as an example, but the digital telephone 6A can be used even in the telephone call state between the digital telephone 6A or the digital telephone 6B and the outside line 9 through the outside line interface 3. Alternatively, if the digital telephone 6B is the calling side, the call can be continued without re-calling.

[0042]

As described above, in the private automatic exchange system of the present invention, in addition to the conventional configuration, the timer management unit, the frequency measuring unit, the message sending unit, and the tone generating unit are provided in the digital telephone interface or the digital telephone. As a result, the call will not be interrupted even if the line between the digital telephone interface and the digital telephone becomes unavailable while the call is put on hold, and there is no need to call again from here. Because it is possible, it leads to the improvement of service.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a private automatic exchange system in an embodiment of a first invention of the present invention.

FIG. 2 is a block diagram showing the configuration of a private automatic exchange system in an embodiment of the second invention of the present invention.

FIG. 3 is a flowchart of a processing procedure from detection of a line abnormality in FIGS. 1 and 2 to transition to a call enabled state again.

FIG. 4 is a block diagram showing a configuration example of a conventional private automatic branch exchange.

[Explanation of symbols]

1 ... Private branch exchange, 2 ... Call path switch part, 3 ...
External line interface, 4A, 4B ... Digital telephone interface, 5 ... Control section, 6A, 6B ... Digital telephone, 7,68 ... Message sending section, 8,69 ... Tone generation section, 9 ... External line, 41, 61 ... Communication control procedure Execution unit, 42, 62 ... Transceiver unit, 43 ... Interface control unit, 44, 67 ... Power supply unit, 45, 70 ... Timer management unit, 4
6, 71… Countermeasurement unit, 63… Microphone, 64… Speaker,
65 ... Voice interface, 66 ... Digital telephone controller.

Claims (2)

[Claims] 1. A digital telephone interface of a private branch exchange accommodating a plurality of digital telephones, and a number measuring section for measuring the number of communication errors and the number of normal communications judged to be possible for a normal call in a communication control procedure executing section. , Elapsed time after detection of communication error due to line disconnection, Elapsed time after sending data resending request to digital telephone, Elapsed time after detection of normal communication due to line restoration, Calling party And a timer management unit having various time management functions capable of arbitrarily setting the time until the time is up, such as the time elapsed after connecting the line to the message sending unit described later, If the line is considered to be abnormal due to, a message is sent to the line on the other end of the call to send a message indicating that the call is temporarily unavailable for some reason. An automatic private premises exchange system having an output section and a tone generation section for transmitting a sound indicating that the line is restored. 2. A digital telephone accommodated in a plurality of private automatic branch exchanges, a communication frequency measuring unit for measuring the number of communication errors and the number of normal communications judged to be possible for normal communication by a communication control procedure executing unit, and a line disconnection. The time elapsed after the communication error was detected, the time elapsed after sending the data resend request to the digital telephone, the time elapsed after the normal communication due to the line restoration was detected, and the line of the other party are described below. It has various elapsed times such as the elapsed time after connecting to the message sending unit and a timer management unit having various time management functions that can arbitrarily set the time until the time is up, and by the above means, a line error is detected. If it is regarded, a message sending part that sends a message indicating that the call is temporarily disabled for some reason to the other party's line and a sound indicating that the line is restored A private automatic exchange system having a tone generator for transmitting.