JP2001237845A - Monitor system for speech voice and its monitor method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor system that monitors only a speech voice. SOLUTION: A controller 11 controlling an ATM switch 10 is provided with a signal processing section 12 that processes a call signal from a subscriber or an adjacent station, a call control section 13 that conducts call processing, a call information storage section 14 that stores the control information, a connection control section 15 that connects/disconnects a connection to/from the ATM switch 10, and a monitor control section 16 that controls a monitor. The ATM switch 10 realizes two connections consisting of a P-P connection where an ATM cell can be sent/received between two lines and of a P-MP connection where an ATM cell received from a line is copied by the required number and outputted to a plurality of lines. A connection connected usually between two subscribers is a speech connection and in the case of conducting voice monitor, it is realized by replacing the speech connection with the monitor connection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone call monitoring system and method, and more particularly, to a telephone call monitoring system and a monitoring method in a digital line or an ATM system.

[0002]

2. Description of the Related Art In a monitoring function in a conventional ATM switching system, communication information between two arbitrary subscribers is extracted as a passing cell to check the quality and the presence or absence of traffic. Since the same applies to voice calls, the call quality was checked by measuring the cell discard rate and cell delay time and checking the respective numerical values.

[0003] This type of conventional telephone call monitoring system in a digital line will be described with reference to the drawings.

FIG. 12 is a block diagram showing an example of the configuration of a conventional telephone call monitoring system.

In FIG. 12, this conventional example is disclosed in
No. 0-173829, showing a telephone exchange function, a line circuit 112 and a trunk circuit 114.
Control device 115 for accommodating a telephone, a dealing call terminal device 111 used for conducting financial transactions, an information processing device 120 for controlling the same, and the information processing device 12
0, a digital open voice terminal 116 for monitoring the connection partner of the digital line by operating the dealing telephone terminal device 111, and a digital monitor line circuit 117 for accommodating the digital line and converting the digital signal of the line into an analog signal. , A recording device adapter 119 which is an interface device with the call recording device 118, and the converted analog line to the digital open voice terminal 1.
A call recording device 118 having a function of recording for each of 16 channels.

Further, in this conventional example, the communication terminal device 111 in the digital open voice system is used.
Press a line monitor key registered in advance on a display (not shown).

Next, when the line monitor key is depressed, the speaker of the digital open voice terminal device 116 turns on the line circuit 112 corresponding to the line monitor key.
And monitor the call voice of the other party between the trunk circuits 114.

When a call is made with the monitored partner, the call can be made with the partner by pressing the talk button of the dealing call terminal 111.

At this time, the digital open voice terminal device 116 digitally multiplexes the monitored voice of the call with the other party and transmits the digital voice to the recording device adapter 119 added to the digital monitor line circuit 117.

The recording device adapter 119 converts the communication voice as digital voice multiplexed into digital voice into analog voice for each channel, and makes the voice recording device 118 record the converted analog voice as voice. .

That is, in this conventional example, even if a digital line is used, the voice of the call to the other party can be recorded on the call recording device 18 via the recording device adapter 119 and then reproduced and heard.

[0012]

In the monitoring function in the conventional ATM switching system, communication information between any two subscribers is extracted as a passing cell, quality and presence / absence of traffic are confirmed, and the same applies to voice communication. Therefore, the call quality can be checked only by measuring the cell loss rate and cell delay time and confirming the respective values.How much the actual cell loss or cell delay at the relay station depends on the call quality However, there is a problem that it is difficult to recognize whether or not it is affecting the actual feeling.

Further, when it is necessary to intercept communication for solving crimes, there is no voice monitoring device in the ATM switching system, so that it is necessary to attach the interception device to the line connected to the terminal of the intercepted person. There was a point.

Further, when the subscriber terminal is a mobile terminal by wireless communication, it is necessary to track the radio wave in accordance with the movement of the subscriber and to intercept the radio wave. As described above, it is effective to monitor the voice in the ATM switching system. However, in the ATM network, not only voice communication but also various traffics are circulating. You need to know that this is a call,
The conventional ATM switching system has a problem that there is no means for recognizing that the call is a voice call.

In the conventional example disclosed in Japanese Patent Application Laid-Open No. H10-173829, recording is started by pressing a "monitor key" from a "dealing terminal", and then a "call button" is pressed. Makes it possible to make a call, and therefore, the third party cannot monitor the voice during the call because "start recording" and "start call" are determined by the will of the dealer who was the person at the time of the call. There is a problem. Also, it is assumed that the connected call connection is "recorded", and that only "call voice" flows on the connection,
When data communication also flows, there is a problem that it is not configured to monitor only voice.

(Object of the Invention) An object of the present invention is to identify a communication service of a call established between two subscribers and, if the service is a voice service, to reproduce the voice of the call, thereby providing a third service. It is an object of the present invention to provide a telephone call monitoring system and a method of monitoring the telephone call voice which enable a person (maintenance person) to open the actual telephone call voice at the exchange.

[0017]

According to the present invention, there is provided a telephone call monitoring system, comprising: a switching device for accommodating a plurality of subscriber terminals via a digital line for switching connections between the subscriber terminals; A control device that controls the connection exchange, a maintenance device that is connected to the control device to monitor the status of the connection exchange and performs maintenance, and a maintenance device that is connected to the exchange device and based on a command from the maintenance device. A voice reproducing device for receiving the copied information from the switching device, restoring the voice into voice, and recording / reproducing the voice, wherein the control device transmits information necessary for calls of the plurality of subscriber terminals and real-time call A call information storage unit for storing a state, a call control unit for controlling the setting, switching, and disconnection of the connection of the generated call to the switching device; and a call control signal from the subscriber terminal from the call control unit. Receiving A signal processing unit that performs the analysis and notifies the result to the call control unit; and reads and rewrites information to and from the call information storage unit in accordance with a command from the maintenance device, and switches a connection to the connection control unit. And a connection control unit for issuing a command for setting, switching, and disconnecting the connection in accordance with an instruction from the call control unit or the monitor control unit. And connection of a point-multipoint connection is possible. Using these, a call connection between the two subscriber terminals is set, and the call connection is changed to a point-multipoint connection by a command from the maintenance device. Monitor connection for connecting to the audio playback device as well as between the two subscriber terminals Is set in the conversion device, and voice information input from one subscriber terminal during a call is output to the other subscriber terminal via the monitoring connection, and at the same time, the switching device Simultaneously copied and output to the audio playback device, audio information from the other subscriber terminal is output to the one subscriber terminal and simultaneously copied by the conversion device and output to the audio playback device. The voice reproduction device restores, records, and reproduces the two copied voice information from the switching device, and the signal processing unit analyzes the call control signal received from the call control unit. Comprising a table and a second table, wherein the first table has a plurality of service types associated with each of a plurality of bearer service classes in the received call control signal, The second table is associated with the plurality of service types in a plurality of traffic classes when a service type cannot be specified in the first table, and the plurality of service types are fixed-speed audio, variable-speed video, The call information storage unit includes variable speed data, and the call information storage unit stores in real time information corresponding to each call number of a plurality of subscriber terminals accommodated in the ATM conversion device, information on the availability and the type of service to be used. , A third table storing at least a monitor identifier indicating whether or not the call voice monitor is activated.

[0018] The method of monitoring a call voice according to the present invention comprises a switching device for accommodating a plurality of subscriber terminals via a digital line and performing connection conversion between the subscriber terminals, and the connection switching of the switching device. A control device that performs control, a maintenance device that is connected to the control device to monitor the state of the connection exchange and performs maintenance, and a switching device that is connected to the switching device and that is based on a command from the maintenance device. A voice reproducing device for receiving the copied information, restoring the voice into voice, and recording and reproducing the voice, wherein the control device stores information necessary for the calls of the plurality of subscriber terminals and a call status in real time. An information storage unit, a call control unit that controls setting, switching, and disconnection of the connection of the generated call to the switching device; and a call control signal from the subscriber terminal received from the call control unit and analysis thereof is performed. Done And a monitor that reads and rewrites information to and from the call information storage unit in accordance with a command from the maintenance device and instructs the connection control unit to reconnect the connection. A control unit, and the connection control unit that issues a command for setting, switching, or disconnecting the connection according to an instruction of the call control unit or the monitor control unit, wherein the call of the subscriber terminal during a call from the maintenance device is provided. When a monitor start is input by designating a number, a monitor start request is notified to the monitor control unit.When the monitor control unit receives the monitor start request, the monitor start unit stores the call number stored in the call information storage unit. It is determined whether or not the specified call exists based on the availability information, and if the specified call exists, the call is a fixed-rate voice service based on the service type. It is determined whether the specified call is present or if the voice service call is NO, the maintenance device is notified to that effect and the processing is terminated, and the presence of the specified call or If the voice service calls are all YES, the connection control unit instructs the connection control unit to switch the connection, and the connection control unit resets the communication connection already set in the ATM switching device to the monitoring connection. Then, the monitor identifier of the corresponding call number is set to ON from the call information storage unit, further instructs the audio reproduction device to start sound reproduction, and the monitor starts to the maintenance device. The call information between one subscriber and the other subscriber during the call is transmitted to the AT as set by the monitor connection.
The cell is copied by the M switching device and output to the voice reproducing device. The voice reproducing device restores the call voice based on the input cell, and transmits the voice between the one subscriber and the other subscriber B. The voice of the call is monitored by the voice reproducing device without impairing the communication.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing the basic system configuration of an ATM switching system according to an embodiment of the present invention. FIG. 2 is a diagram showing a call state between subscriber terminals A and B in the present embodiment.
FIG. 3 is a diagram showing a state of monitoring a call voice in the call state shown in FIG. 2, and FIG. 4 is a diagram showing a bearer service class and a service uniquely determined by a network stored in advance in a signal processing unit in the present embodiment. FIG. 5 is a diagram showing a type exchange table, FIG. 5 is a diagram showing a correspondence table between a uniquely determined traffic class and service type stored in advance in the signal processing unit in the present embodiment, and FIG. It is a figure which shows a part of information regarding all the subscribers memorize | stored in the call information storage part in the form of FIG.

In the ATM switching system of this embodiment shown in FIG. 1, reference numeral 10 denotes an ATM switching device, 11 denotes a control device of the ATM switching device, 12 denotes a signal processing unit, 13 denotes a call control unit, and 14 denotes a call information storage unit. , 15 is a connection control unit, 16 is a monitor control device, 17 is an audio reproduction device, and 18 is a maintenance device. The signal processing unit 12 receives the call control signal from the subscriber, analyzes the signal, and notifies the call control unit 13 if necessary. The call information control unit 14 stores information necessary for a call, and stores an identifier indicating whether the call is being monitored for each call. The connection control unit 15 sets, switches, and disconnects the connection to the ATM conversion device 10 according to the instruction of the call control unit 13 or the monitor control unit 16. The monitor control unit 16 reads and rewrites information in the call information storage unit 14 and instructs the connection control unit 15 to reconnect the connection in accordance with an instruction from the maintenance device 18. A subscriber terminal (or an adjacent switching center) is connected to the ATM switching device 10 and performs cell switching according to the connection set by the connection control unit 15.

Here, in the ATM switching device 10, a point-to-point (P
-P) Connections and Point-to-Multiplies
point (P-MP) connection can be set, and by using these, the call connection 21 shown in FIG.
The monitor connection 31 shown in FIG. The monitoring connection 31 has two point-to-mu connections.
lpoint (P-MP) connections 32 and 33
And an ATM input from the subscriber terminal A1a.
The cell is output to the subscriber terminal B1b using the P-MP connection 32, and at the same time, the ATM cell copied by the ATM switching device 10 is output to the voice reproducing device 17. Similarly, the ATM cell input from the subscriber terminal B1b is output to the subscriber terminal A1a using the P-MP connection 33, and at the same time, the ATM cell copied by the ATM switching device 10 is transmitted to the voice reproducing device 17. Output to The audio reproducing device 17 assembles the received cell,
This is a device that restores, reproduces, and records audio from the obtained information.

When performing signal analysis in the signal processing unit 12,
It has a conversion table 40 which is uniquely determined in the network as shown in FIG. 4, and it is possible to specify the service type 42 from the bearer service class 41 displayed by the received signal using this. Further, when the bearer service class 41 is a class that does not specify a service type such as BCOB-X, a table 5 as shown in FIG.
0 is held so that the service type 52 can be uniquely determined from the designated traffic class 51. The call information storage unit 14 stores call information 60 as shown in FIG. 6 for each call. 61 represents a call number, 62 represents the call number being occupied, 63 represents a service type to be used, and 64 represents whether or not a voice monitor is activated for the call. Therefore, it is possible to know from the call information 60 whether or not it is indicated by the call number 61. Note that the monitor identifier 64 is valid only when the service type 63 is a fixed speed audio.

Next, the setting and termination of the monitoring connection in the present embodiment will be described in detail with reference to FIGS.

The arrow 3 in the ATM exchange 10 shown in FIG.
2 and 33 are two Point-to-Multipoi
nt (P-MP) connection, 32 and 33
Flows ATM cells input from the subscriber terminals A1a and B1b in the direction of the other subscriber indicated by the respective arrows. The ATM switching device 10 copies the ATM cell where the arrows of the connections 32 and 33 branch, and outputs it to the audio reproducing device 17. As described above, the monitoring connection 31 is an existing Point-to-Multipoint (P-MP).
It is configured by combining two connections, and realizes information distribution to the audio reproducing device 17 without impairing communication between the subscriber terminals A1a and B1b. When receiving a call signal from the subscriber terminal, the signal processing unit 12 analyzes the call signal, specifies a communication service type of the call, and instructs the call control unit 31 to establish a call. Upon receiving the call establishment instruction, the call control unit 13 passes the communication service type and other call control information to the call information storage unit 14, and the call information storage unit 14 stores them.

Finally, the call control unit 13 instructs the connection control unit 15 to establish a connection, and establishes a call and a connection. When the maintenance person performs voice monitoring for a specific call, when the maintenance person inputs the voice monitoring activation together with the call number to the maintenance device 18, the maintenance device 18
Instructs the monitor control unit 16 to activate the voice monitor of the specified call. Monitor control unit 16 receiving the instruction
Receives the information on the designated call number from the table 60 shown in FIG. 6 of the call information storage unit 14, and checks whether the call is a voice call from the service type. When it is confirmed that the call is a voice call, the monitor control unit 16 notifies the call information storage unit 14 that the monitoring of the corresponding call is started, and the call information storage unit 14 monitors the call. Turn on the identifier. Next, the monitor control unit 16 instructs the connection control unit 15 to change the connection of the relevant call, and the connection control unit 15 that has received the instruction is connected to the specified call as shown in FIG. Call connection 21
Is replaced with the monitor connection 31 shown in FIG. When the reconnection of the connection is completed, the monitor control unit 16 instructs the sound reproducing device 17 to start sound reproduction, and the sound reproducing device 17 that has received the instruction starts sound reproduction.

Through the above series of operations, the voice information of the call specified by the maintenance person is distributed to the voice reproducing device 17 by the connection 31 shown in FIG. The maintenance person can monitor the sound of the specified call by listening to the sound from the sound reproducing device 17.

When the maintenance person wants to end the voice monitoring, he designates the call number during the voice monitoring and instructs the maintenance device 18 to end the voice monitoring. Signals the end of call monitoring. The monitor control unit 16 that has received the end notification issues an instruction to switch the connection to the connection control unit 15, and the connection control unit 15 that has received the instruction displays the connection 31 shown in FIG. 3 in FIG. Replace with connection 21.

Next, the monitor control section 16 notifies the call information storage section 14 that the monitoring of the call has been completed, and the call information storage section 14 receiving this notifies the table 60 shown in FIG. Turn off the monitor identifier of the corresponding call number. Finally, the monitor control unit 16 controls the sound reproduction device 17
To the audio playback device 17
Ends the sound reproduction.

By these series of operations, the audio reproducing device 1
The sound output from 7 is stopped, the sound cannot be heard by the maintenance person, and the sound monitor ends. If a call disconnection request for voice monitoring is received, the call control unit 13 recognizes from the monitor identifier stored in the call information storage unit 14 that the call is being monitored, and the connection control unit 15 When instructing to disconnect, it is notified that it is being monitored. In this case, the connection control unit 15 disconnects the monitoring connection 31 shown in FIG. 3, instead of the normally disconnected connection 21 shown in FIG.

Then, the connection control unit 15 notifies the monitor control unit 16 that the connection 31 has been disconnected. The monitor control unit 16 that has received this notification outputs a monitor end to the maintenance device 18. At the same time, it instructs the audio reproduction device 17 to end reproduction.

As described above, even when the call being monitored by the voice monitor is disconnected, the call can be disconnected without any particular problem, and the voice monitor can be immediately terminated.

Thus, in the present embodiment, the ATM
The monitoring function can be realized in the switching system.

FIG. 7 is a flowchart showing the operation of the control apparatus according to the present embodiment after receiving a call signal, and FIG. 8 is a flowchart showing the operation of the control apparatus according to the present embodiment based on the call signal of the signal processing unit. 9 is a flowchart showing an analysis process for specifying the type, FIG. 9 is a control flowchart showing a case where a sound monitor of the control device according to the present embodiment is activated,
FIG. 10 is a control flowchart of the control device showing the case where the monitor of the monitor control unit according to the present embodiment ends, and FIG. 11 is a control showing the operation of the control device when a call disconnection signal is detected in the present embodiment. It is a flowchart.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, subscriber terminal A1a or B
When the ATM switching device 10 receives a call signal from 1b (or an adjacent switching center), the signal is passed to the control device 11. When a call signal is detected in S70 of FIG. 7, the signal processing unit 12 in FIG. 1 analyzes the received signal and issues a call setting request to the call control unit 13 to perform call setting. At this time, the service type is specified from the signal using the solution procedure shown in FIG. 8 (S71 in FIG. 7),
The service type is passed to the call control unit 13 simultaneously with the call setting request. In response to the call setting request, the call control unit 13 captures an idle call number from the call information table 60 shown in FIG. Then, necessary information is stored in the call information storage unit 14. The information stored at this time is the service type 63 in the call information table 60. If the service type 63 is a fixed-rate voice, the monitor identifier 64 is initialized (OFF). Subsequently, the connection control unit 15 is instructed to set the communication connection 21 in FIG.
5 sets a call connection 21 in the ATM switching device 10. At this point, the call is established, and the subscriber A and the subscriber B can communicate with each other using the communication connection 21.

This processing is performed by the signal processing unit 12 shown in FIG. The Broadband Bearer is an essential information element for specifying the transmission capability in the ATM call signal.
Capability (hereinafter referred to as BBC) exists, and BBC includes BCOB (Broadband Con).
connection-Oriented Bearer S
service) parameter "bearer class"
Exists. Also, when BCOB-X is specified for the bearer class, a parameter indicating the transfer capability, ATM T
transfer Capability (hereinafter referred to as ATC) exists.

In the processing flow in FIG. 8, these two parameters are used, and one example of each correspondence table is shown in the table 40 of FIG. 4 and the table 50 of FIG. FIG.
The information shown in the table 40 and the table 50 in FIG. In FIG. 8, when a call signal is received, a bearer service class is obtained from the bearer class parameter in the BBC in S80, and the table 40 in FIG.
Is used to identify the service type 42. At this time, if the bearer service class matches BCOB-A or BCOB-B or BCOB-C, the table 40 in FIG.
, The service type is uniquely determined. If the bearer service class is BCOB-X in S80,
The traffic class can be specified in S81 based on the ATC, and the service type can be specified using the table 50 in FIG.

When the maintenance person designates the call number from the maintenance device 18 in FIG. 1 and inputs the start of monitoring, this instruction is notified to the monitor control unit 16 in the control device 11. When receiving the monitor activation request in S90 of FIG. 9, the monitor control unit 16 determines in S91 whether or not the specified call exists based on the call number 61 and the occupancy information 62 in the table 60 of FIG. . If the specified call exists, it is determined in S92 whether the call is a fixed-rate voice service based on the service type 63 in the table 60 of FIG. If one of S91 and S92 is NO, the maintenance device 18 notifies that fact and ends the processing.

If both S91 and S92 are YES, the connection control unit 15 is instructed to reconnect the connection (S93 in FIG. 9), and the connection control unit 15
Call connection 21 already set in switching device 10
(FIG. 2) is reset to the monitor connection 31 (FIG. 3). Subsequently, in S94, the call information table 60 of FIG.
Of these, the monitor identifier 64 of the corresponding call number is set to ON. Further, in S95, the audio reproduction device 17 in FIG. 1 is instructed to start audio reproduction. Then, it notifies the maintenance device 18 that the monitor has been started, and ends the processing. At this point, the call information between the subscribers A and B is copied to the ATM switching device 10 as set by the monitoring connection 31 shown in FIG. The audio reproducing device restores the audio based on the input cell, and the monitor is realized without impairing the communication between the subscribers A and B.

When the maintenance person inputs the end of monitoring at the maintenance device 18 of FIG. 1, this instruction is notified to the monitor control unit 16. Upon receiving the monitor end request in S100 of FIG. 10, the monitor control unit 16 determines whether or not the corresponding call is being monitored from the monitor identifier 64 of the call information table 60 in FIG. 6 (S10 in FIG. 10).
1). If the determination is NO in S101, the process ends, and the maintenance device 18 is notified of that fact. If the judgment is YES in S101, the audio reproduction device 17 is instructed to stop reproduction in S102. Then S103
, The connection control unit 15 is instructed to change the connection, and the connection control unit 15 changes the monitor connection 31 (FIG. 3) set in the ATM switching device 10 to the call connection 21 (FIG. 2). Perform a replacement.

Next, the monitor control unit 16 sets the monitor identifier 64 of the corresponding call number in the call information table 40 stored in the call information storage unit 14 to OFF. Then, the maintenance device 16 is notified that the monitoring has been completed, and the process is terminated. With this control, the monitoring of the voice is stopped, but the call between the subscriber A and the subscriber B is continued using the connection 21.

In the control flow shown in FIG. 11, for example, disconnection is performed irrespective of whether a call between the subscriber A1a and the subscriber B1b is being monitored.

At S110 in FIG. 11, the signal processing unit 1 in FIG.
2 detects the disconnection signal, the signal processing unit 12 instructs the call control unit 13 to disconnect the corresponding call. In S111, the call control unit 13 determines whether the corresponding call is being monitored based on the call information table 40 (FIG. 4) stored in the call information storage unit 14 of FIG. If the determination result in S111 is NO, the connection control unit 15
An instruction to disconnect the call connection 21 is issued.

Upon receiving this instruction, the connection control unit 15 sends the ATM
Disconnect the connection 21 of the switching device 10 (11
2). If the determination result in S111 is YES, the call control unit 13 issues an instruction to disconnect the monitoring connection 31 to the connection control unit 15. Upon receiving this instruction, the connection control unit 15 disconnects the monitoring connection 31 (FIG. 3) of the ATM switching device 10 in S113. Further S1
At 14, a monitor end is notified to the monitor control unit 16.

The monitor control unit 16 instructs the audio reproduction device 17 to stop reproduction in S115, and then notifies the maintenance device 18 that the monitoring has been terminated by disconnecting the call (S114), and ends the processing. Subsequently, the call control unit 13 releases the call in S116. At this time, among the call information 40 stored in the call information storage unit 14, the idle / busy information 42 of the corresponding call number is emptied. .

Thus, the call disconnection control in FIG. 11 is completed. By these series of control operations, an audio monitoring device is realized.

In the above-described embodiment, the monitor activation is instructed at an arbitrary time for a call during a call. However, if the target subscriber can be specified in advance, as in the case of interception of a call, the monitor is activated. By adding some information to be intercepted to the subscriber information and identifying it by the call control unit 13, the monitoring may be started at the same time as the outgoing / incoming call.

The bearer service classes and service types and their correspondences shown in FIG. 4 and the traffic classes and service types and their correspondences shown in FIG. 5 are merely examples, and various classes may be required for each network. , A combination may be set.

[0050]

As described above, according to the present invention, a switching device for accommodating a plurality of subscriber terminals via a digital line and exchanging connections between subscriber terminals, and controlling the exchange switching of the switching devices. A control device that performs connection, a maintenance device that is connected to the control device to monitor the status of connection exchange and performs maintenance, and that is connected to the exchange device and receives copied information from the exchange device based on a command from the maintenance device. A voice reproduction device for restoring and recording / reproducing a voice by a control unit, wherein the control unit stores information necessary for calls of a plurality of subscriber terminals and a call information storage unit for storing a call status in real time; A call control unit for controlling connection setting, reassignment, and disconnection of a generated call, and a signal for receiving a call control signal from a subscriber terminal from the call control unit, analyzing the result, and notifying the result to the call control unit. Processing unit and maintenance equipment A monitor control unit that reads and rewrites information to and from the call information storage unit in accordance with the instruction and instructs the connection control unit to reconnect the connection, and sets and reconnects the connection in accordance with the instruction of the call control unit or the monitor control unit. , And a connection control unit for issuing a disconnection command, which enables the maintenance person to realize the degree of quality deterioration due to cell discarding, etc., by realizing the monitoring of the call voice using the existing equipment of the ATM switching system. This has the effect that an efficient network can be easily constructed.

Further, in conducting a criminal investigation, since the telephone call can be monitored at the exchange, it is possible to save the cost and time required for installing the monitor device at the terminal of the intercepting person as in the prior art. Further, since the monitor itself is not required, the time required for solving the crime can be shortened, the cost can be reduced, and the crime can be more economically investigated than before.

[Brief description of the drawings]

FIG. 1 is a principle system configuration diagram showing an ATM switching system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a call state between subscriber terminals A and B in the present embodiment.

FIG. 3 is a diagram showing a state of monitoring a call voice in the call state shown in FIG. 2;

FIG. 4 is a diagram illustrating a conversion table of bearer service classes and service types uniquely determined in a network and stored in advance in a signal processing unit according to the present embodiment.

FIG. 5 is a diagram showing a table of correspondence between uniquely determined traffic classes and service types stored in advance in a signal processing unit according to the present embodiment.

FIG. 6 is a diagram showing a part of information on all subscribers stored in a call information storage unit according to the present embodiment.

FIG. 7 is a flowchart showing an operation of the control device according to the present embodiment after receiving a call signal.

FIG. 8 is a flowchart illustrating an analysis process in which a control device according to the present embodiment specifies a service type based on a call signal of a signal processing unit.

FIG. 9 is a control flowchart showing a case where a sound monitor of the control device according to the present embodiment is activated.

FIG. 10 is a control flow of the control device in a case where the monitor of the monitor control unit according to the present embodiment ends.

FIG. 11 is a control flowchart showing an operation of the control device when a call disconnection signal according to the present embodiment is detected.

FIG. 12 is a block diagram showing an example of a configuration of a conventional telephone call monitoring system.

[Explanation of symbols]

 1a subscriber terminal A 1b subscriber terminal B 10 ATM switching device 11 control device 12 signal processing unit 13 call control unit 14 call information storage unit 15 connection control unit 16 monitor control unit 17 sound reproduction device 18 maintenance device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 3/56 F term (Reference) 5K015 AF10 DA00 GA03 JA01 5K019 AC09 BA61 CC17 DB08 5K030 GA14 HA10 HB01 HB14 HB16 HC01 KA13 LB13 MB04 MC08 5K035 AA04 AA07 BB04 CC01 DD01 EE01 FF01 GG14 HH03 HH07 JJ05 KK01 9A001 BB04 CC07 DD10 EE05 HH15 HH34 JJ12 KK56

Claims (6)

[Claims] An exchange device for accommodating a plurality of subscriber terminals via a digital line and exchanging connections between the subscriber terminals, a control device for controlling the connection exchange of the exchange devices, and the control device A maintenance device that connects to the device and monitors the status of the connection exchange to perform maintenance, and a voice device that is connected to the exchange device and receives information copied from the exchange device based on a command from the maintenance device and receives voice. A voice reproduction device that performs recording and reproduction by restoring the information to a call information storage unit that stores information necessary for calls of the plurality of subscriber terminals and a state of the call in real time; A call control unit for controlling connection setting, switching, and disconnection of the generated call, receiving a call control signal from the subscriber terminal from the call control unit, analyzing the received signal, and transmitting the result to the call control unit; Signal to notify A processing section, reads information for the call information storage unit in accordance with a command from the maintenance device, and the monitor control section for instruction rearrangement of connections to the connection control unit performs rewriting,
A call control unit for issuing a command for setting, switching, or disconnecting the connection in accordance with an instruction from the call control unit or the monitor control unit. 2. The switching device is capable of connecting a point-to-point connection and a point-to-multipoint connection, and uses these to set up a call connection between the two subscriber terminals. The call connection is switched to a point-to-multipoint connection by the command of the above, the setting of the monitor connection to be connected not only between the two subscriber terminals but also to the audio reproducing device is performed by the conversion device, and one of the subscribers during the call is set. The audio information input from the subscriber terminal is output to the other subscriber terminal via the monitoring connection, and at the same time, is copied by the switching device and output to the audio reproduction device, and the other subscriber The voice information from the terminal is output to the one subscriber terminal and simultaneously copied by the converter. 2. The telephone call monitoring system according to claim 1, wherein the audio data is output to the audio reproducing device, and the audio reproducing device restores, records, and reproduces the two copied audio information from the switching device. 3. The signal processing unit has a first table and a second table for analyzing a call control signal received from the call control unit, and the first table stores the received call control signal. A plurality of service types associated with each of a plurality of bearer service classes in the control signal, and the second table is divided into a plurality of traffic classes when the service type cannot be specified in the first table. 2. The telephone call monitoring system according to claim 1, wherein the system is associated with the plurality of service types. 4. The call voice monitoring system according to claim 3, wherein said plurality of service types include fixed speed voice, variable speed video, and variable speed data. 5. The call information storage unit stores, in real time, information on the service type to be used, which is stored in real time associated with each call number of a plurality of subscriber terminals accommodated in the ATM conversion device, 4. The call voice monitoring system according to claim 2, further comprising a third table storing at least a monitor identifier indicating whether the call voice monitor is activated. 6. An exchange device for accommodating a plurality of subscriber terminals via a digital line and performing connection conversion between the subscriber terminals, a control device for controlling the connection exchange of the exchange device, and the control device. A maintenance device that connects to the device and monitors the status of the connection exchange to perform maintenance, and a voice device that is connected to the exchange device and receives information copied from the exchange device based on a command from the maintenance device and receives voice. A voice reproduction device for restoring, recording, and reproducing the information; the control device stores information necessary for calls of the plurality of subscriber terminals and a call information storage unit that stores a call state in real time; A call control unit for controlling connection setting, switching, and disconnection of the generated call, receiving a call control signal from the subscriber terminal from the call control unit, analyzing the received signal, and transmitting the result to the call control unit. Signal processing to notify A monitor control unit that reads and rewrites information to and from the call information storage unit in accordance with a command from the maintenance device and instructs a connection control unit to reconnect the connection; and the call control unit or the monitor. A connection control unit for issuing a command for setting, reassigning, or disconnecting the connection in accordance with an instruction from a control unit; and a monitor start is input from the maintenance device by specifying a call number of the subscriber terminal that is in a call. A monitor start request is notified to the monitor control unit.When the monitor control unit receives the monitor start request, a call specified based on the idle / busy information of the call number stored in the call information storage unit. It is determined whether the call exists.If the specified call exists, it is determined whether the call is a fixed-rate voice service based on the service type. If either the presence of the call or the voice service call is NO, the maintenance device is notified to that effect and the processing is terminated, and the presence of the specified call or the voice service call is both YES. Instructs the connection control unit to reconnect the connection, and the connection control unit resets the communication connection already set in the ATM switching device to the monitoring connection, and then applies the connection from the call information storage unit. The monitor identifier of the call number is set to ON, and the sound reproducing device is instructed to start sound reproduction, and the maintenance device is notified that the monitor is started. The call information between one of the subscribers and the other subscriber is the voice whose cell has been copied by the ATM switching device as set by the monitoring connection. Output to the playback device, the voice playback device restores the call voice based on the input cells, and performs a call with the voice playback device without impairing communication between the one subscriber and the other subscriber B. A method for monitoring call voice, wherein the voice is monitored.