JPH11243451A - Sound response services continuation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the size of a device smaller by adding contrivance to the redundant structure of a sound accumulation device in a sound response device and to avoid a temporary interruption of sound response services by having the device operates as through it were a duplex structure, while adapting a structure of an (N+1) system for a unit in the sound response device. SOLUTION: TSW 3 switches data between an SWE 1 and VAUs 41,..., 43 in units of time slot. Each of the VAUs 41,..., 43 is connected to HDs 71,..., 74 respectively through buses 61,..., 64, performs extension processing of compressed sound data stored in each of the HDs 71,..., 74 and transmission and reception of a PB signal, and at the same time, transmits the sound data to the TSW 3 through highway interfaces 31,..., 33, and performs transmission and reception of the sound data to the HDs 71,..., 73 through the buses 61,..., 63. The HD 74 of a reserve system stores the same data as storage data of an operation system HD, switches and continues services when access to a specific HD in duplex state is unavailable because of a fault. An SCU 5 performs the overall control and management of a VRS 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice response service continuation system, and more particularly, to a voice response system connected to an exchange installed in a public network by a communication line and a control line, even when a failure occurs in an active unit. The present invention relates to a voice response service continuation method for continuing a voice guidance transmission service to a subscriber who is provided.

[0002]

2. Description of the Related Art As a first example of this type of conventional technology, a "duplex system of a voice storage device" described in Japanese Patent Application Laid-Open No. 5-7241 is described. The voice storage device in the connected voice response device has a duplex configuration, and a failure detection function and a health check function do not interrupt service even when a failure occurs in one system.

Further, in the second conventional example in which the voice storage device has a redundant configuration of the (N + 1) system, if the current voice storage device fails while transferring voice guidance,
The first method of continuing the service by so-called reduced operation in which the operation is performed by reducing the processing load by reducing the number of lines processed by the voice response system, or the second method in which the service is temporarily suspended and restored. One of the techniques was adopted.

[0004]

In the first conventional example, since the voice storage device in the voice response device is completely duplicated, the voice response device becomes large and expensive. there were.

In the second conventional example, since the voice guidance needs to be transferred to the standby unit in order to continue the service when the active unit fails, the transfer time becomes longer when the voice guidance amount increases. There was a problem that it became very long.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the scale of the voice response device by modifying the redundant configuration of the voice storage device in the voice response device, and to adopt the (N + 1) system configuration for the units in the voice response device. However, it is an object of the present invention to provide a voice response service continuation method in which the voice response service is operated as if it were a duplex configuration so as to avoid a temporary interruption of the voice response service.

[0007]

According to the present invention, there is provided a voice response system which is connected to an exchange installed in a public network by a communication line and a control line and provides a voice guidance transmission service to the exchange. The voice response system includes N voice processing units and a (N + 1) redundant voice storage unit connected to each voice processing unit, and only the specific voice storage unit is configured to be duplicated. A voice response service continuation method characterized by the above feature is obtained.

Further, there is provided a voice response service continuation system characterized by comprising selection means for selecting the specific voice storage unit.

Further, the voice response system includes a time-division switch connected to the exchange by the communication line,
The system includes N voice processing units, a system control device, N active voice storage units and one standby voice storage unit, and the time division switch is connected to each of the voice processing units by a highway. An interface is connected to switch data between the exchange and each of the voice processing units in time slot units. Each of the voice processing units is connected to each of the active voice storage units through a bus, and is connected to a common bus. Through which the compressed audio data stored in each of the audio storage units is decompressed and the push button signal is transmitted and received, and audio is transmitted to the time division switch through each of the highway interfaces. It transmits data and transmits and receives voice data to and from each of the active voice storage units through the bus. The spare voice storage unit stores the same data as the storage data of the affected active voice storage unit, and the system control device transmits the voice data when the affected voice storage unit is inaccessible. A voice response service continuation method is provided in which control is performed to switch and connect the voice processing unit corresponding to a storage unit to the standby voice storage unit.

[0010] Then, when an active voice storage unit is affected, the voice processing unit connected to the voice storage unit and the bus is switched to the standby voice storage unit according to an instruction from the system control unit. And read the data in the spare voice storage unit to continue the service, and after the hardware replacement of the affected voice storage unit is completed, the data stored in the spare voice storage unit has been replaced. A voice response service continuation method is obtained, characterized in that the voice storage is copied to the voice storage and then this voice storage is used as an active system.

The voice processing unit connected to the affected voice storage unit via the bus copies the data stored in the voice storage unit selected according to the selection conditions to the standby voice storage unit. When the parameter of the selection condition is changed, the system control device checks whether the condition is the worst condition in the voice response system, and when it is determined that the condition is the worst condition, changes the corresponding voice storage unit of the standby system. Then, an instruction to copy the stored data of the voice storage unit determined to be the worst condition to the changed standby voice storage unit is issued, thereby obtaining the voice response service continuation method.

Here, the parameters of the selection condition may include a read / write error of a hard disk for storing audio, a retry process of hard disk driver software, and a substitute process in the hard disk.

[0013]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a system block diagram showing one embodiment of the present invention.

Referring to FIG. 1, a voice response system (VRS) 2 of the present embodiment includes a time division exchange (SWE) installed in a public network by a communication line (2M / 8M line interface) 11 and a control line 12. 1, a time division switch (TSW) 3, N (N = 3 in FIG. 1) voice processing units (VAUs) 41, 42, 43, a system control unit (SCU) 5, and (N + 1) Audio storage units (hard disk: HD) 71, 72, 73 and 74.

TSW3 is connected to SWE1 and communication line 1
1 and VAUs 41, 42, 43
Means highway interfaces 31, 32, 3 respectively
3 and SAU1 and VAUs 41, 42, 4
3 is switched in time slot units. The switching of each highway interface 31, 32, 33 is performed by the SCU 5 to the LAN interface 5
This is performed by a command / status input through 0, 51, 52, and 53.

Each of the VAUs 41, 42 and 43 has a bus 6
1, 62 and 63, and to the HDs 71, 72 and 73, respectively, and
D74, and expands compressed audio data stored in each of the HDs 71, 72 and 73 (PCM
) And a push button (PB) signal.

The VAUs 41, 42 and 43 are connected to highway interfaces 31, 32 and 33, respectively.
Transmission of audio data to the TSW3 through the
1, 72 and 73 transmit and receive audio data through buses 61, 62 and 63, respectively.

The HD 74 stores the same data as any one of the active HDs 71, 72, and 73 as a standby audio storage unit, and stores a specific active HD in a duplex state. If a failure occurs and access is not possible, switch to the HD 74 to continue the service.

The SCU 5 is connected to the SWE 1 by the control line 12, and is connected to the TSW 3, VAUs 41, 42 and 43 by the LAN interfaces 50, 51, 52 and 53, and performs all sequence control and data management in the VRS 2. Do.

Next, the operation of this embodiment will be described in detail with reference to FIGS. 1, 2, 3 and 4.

FIG. 2 is a flowchart for explaining the operation when switching to the standby audio storage unit occurs in the present embodiment, and FIG. 3 is a process for selecting an audio storage unit to be copied in the present embodiment. FIG. 4 is a flow chart showing the procedure, and FIG. 4 is a flow chart showing the operation processing procedure for changing the selection condition parameter in step 203 in FIG.

Referring to FIG. 1 and FIG. 2, when a failure occurs in a certain active audio storage unit, for example, the HD 71 (step S101), the VAU 41 switches from the SCU 5 to the L
A standby HD 74 storing the same data as the HD 71 in accordance with the instructions sent through the AN interface 51
(Step S102). Here, VAU4
1 accesses the HD 74 through the common bus 64 and
By reading the data in 74, the service can be continued.

Then, during the continuation of the service, the maintenance person replaces the hardware of the failed HD 71 (step S103).

After the replacement of the hardware of the affected HD, the stored data is copied from the HD 74 to the replaced HD 71 while the service by the HD 74 is continued (step S104). When the data copy process to the replaced HD 71 is completed, the HD 71 is switched again to the active system (step S105), and the HD 74 enters the standby state as the standby system.

Next, referring to FIGS. 3 and 4 together with FIG. 1, the voice storage unit in the VRS 2 is selected according to certain conditions shown in FIG. 4 (step S201), and the data stored in the voice storage unit is reserved. It is copied to the system HD 74 (step S202). The parameters of the selection condition shown in FIG. 4 (Step S301: HD driver software retry processing, Step S302: HD alternative sector processing, Step S3
03: read / write error) (changed in step S203), the SCU 5 checks whether or not the worst condition (high probability of failure) is in the VRS2 (step S204). In other words, if it is determined that the worst condition, change the corresponding voice storage unit of the standby system,
An instruction to copy the data stored in the voice storage unit determined to be the worst condition to the standby voice storage unit is issued, the copy HD is changed (step S205), and the process returns to step S202.
If the parameters of the selection conditions are not changed (no change in step S203), or if the parameters of the selection conditions are not determined to be the worst conditions in VRS2 even if the parameters of the selection conditions are changed (No in step S204), the standby system voice is output. The storage unit is not changed by the HD 74, and the data copy operation is not executed (step S206).

Next, referring to FIG. 4, the SC shown in FIG.
U5 manages the selection of the active audio storage unit to be duplicated in the VRS2. Each VAU 41, 42 and 4
The software No. 3 counts the information when the HD driver software retry process (step S301), the substitute sector process in the HD (step S302), or the read / write error (step S303) occurs (step S304). , S305, S30
6) Notify the SCU 5 through the LAN interfaces 51, 52 and 53, respectively. The SCU 5 stores error information of the voice storage unit of each active system (step S30).
7) The selection parameters are updated as needed to change the voice storage unit to be duplicated (step S308).

Next, a first embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The configuration of the first embodiment is the same as the configuration of the embodiment of the present invention described above.

When a subscriber attempts to receive an information service from VRS2, the subscriber receives SWE1 and TSW3.
, And another subscriber accesses another voice processing unit, for example, the VAU 42 to receive the service. In other words, the audio processing units accessed by the services are different, and at the same time, the audio storage units connected to each audio processing unit by the bus are accessed.

Here, a specific audio processing unit (for example, V
If a read error occurs in the AU 41) for some reason, a retry process is performed by the hard disk driver software in the VAU 41. Also, when a write error occurs, retry processing is performed.
If an error still occurs, area replacement processing is performed.

The error information is counted and SC
U5 is notified. In SCU5, each HD 71, 72,
Each factor shown in FIG. 4 (step S301:
HD driver software retry processing, step S30
2: Alternative sector processing in HD, step S303: read / write error) is counted (steps S304, S
305, S306), and stores the error information of each HD (step S307).

Then, based on the information, the audio storage unit having the largest error information in one hour is selected, and the stored data is copied to the standby HD 74 while executing the service.
After the copy is completed, the active voice storage unit is in a duplicated state, and even if a failure occurs and the subscriber cannot access the service due to inaccessibility, the standby HD is stored.
The service is switched to 74 and the service is continued.

The failed audio storage unit is a hard disk (H
After replacing D), the stored data is copied from the standby HD 74, and when the contents of the HD become the same, the active HD is switched to the active HD, and the standby HD 74 that has been operating until now returns to the standby state.

Further, when the selection parameter is changed again due to a certain factor and another active HD becomes a copy target of the standby HD according to the flow shown in FIG. 3, the data is copied and duplicated. State.

The standby HD does not become the active HD unless the duplicate HD of the active HD fails. Therefore, even if it is not replaced, H
D may be updated. Further, it is also possible to replace the HD in the sense of preventive maintenance without causing a failure.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The configuration of the second example is the same as the configuration of the above-described embodiment of the present invention.

When a subscriber tries to receive an information service from VRS2, the subscriber receives SWE1 and TSW3.
, And another subscriber accesses another voice processing unit, for example, the VAU 42 to receive the service. In other words, the audio processing units accessed by the services are different, and at the same time, the audio storage units connected to each audio processing unit by the bus are accessed.

Here, a specific audio processing unit (for example, V
If a read error occurs in the AU 41) for some reason, a retry process is performed by the hard disk driver software in the VAU 41. Also, when a write error occurs, retry processing is performed.
If an error still occurs, area replacement processing is performed.

These error information are counted and SC
U5 is notified. In SCU5, each HD 71, 72,
Each factor shown in FIG. 4 (each step S30)
1: HD driver software retry processing, S302: H
Substitute sector processing in D, S303: read / write error) is counted (each step S304, S305, S3)
06) and stores the error information of each HD (Step S)
307).

The above-mentioned factors include the replacement sector processing in HD (step S302)> read / write error (step S302).
303)> Priority is given in the order of retry processing (step S301) of the HD driver software, and a voice storage unit having a high count is selected in a high priority item, and the standby voice storage unit is executed while executing a service. Copy the stored data to

After completion of the data copy,
When the active voice storage unit is in a duplex state and a failure occurs and the subscriber cannot access the service due to inaccessibility, switch to the standby voice storage unit to continue the service. Is done.

After replacing the hardware, the failed voice storage unit copies the stored data from the spare HD 74,
When the content of the HD becomes the same, the HD is switched to the active system, and the standby HD 74 that has been operating until now returns to the standby state.

When a selection parameter is changed again due to a certain factor, and another active HD becomes a copy target of the standby HD according to the flow shown in FIG. 3, the data is copied and duplicated. State.

The standby HD does not become the active HD unless the duplicate HD of the active HD fails. Therefore, even if it is not replaced, H
D may be updated. Further, it is also possible to replace the HD in the sense of preventive maintenance without causing a failure.

[0044]

As described above, the present invention relates to a voice response system which is connected to an exchange installed in a public network by a communication line and a control line and provides a voice guidance transmission service to the exchange. The system includes N voice processing units and a (N + 1) -type redundant voice storage unit connected to each voice processing unit, and only a specific voice storage unit is configured to be duplicated. , The voice response system further includes a time division switch connected to the exchange via a communication line, N voice processing units, a system control device, , N active voice storage units and one standby voice storage unit, and the time-division switch has a high-speed It is connected by an interface and switches data between the exchange and each voice processing unit in units of time slots. It is connected to the audio storage unit, performs decompression processing of compressed audio data stored in each audio storage unit, transmits and receives a push button signal, transmits audio data to the time division switch through each highway interface, and performs each current operation. The voice storage unit of the system transmits and receives voice data through the bus, the voice storage unit of the standby system stores the same data as the storage data of the active voice storage unit, and the system control unit transmits the data. When the selected audio storage unit is inaccessible, the audio processing unit corresponding to this audio storage unit is replaced by the standby audio storage unit. By performing the switching connection control, and when a certain active voice storage unit is damaged, the voice processing unit connected to the voice storage unit and the bus is switched to the standby voice storage unit by an instruction of the system control device. The access is switched to, the data in the standby voice storage unit is read, the service is continued, and after the hardware replacement of the affected voice storage unit is completed, the stored data of the standby voice storage unit has been replaced. The audio storage unit is copied to the audio storage unit, and thereafter, the audio storage unit is used as an active system. Also, the audio processing unit connected to the affected audio storage unit by a bus connects the audio storage unit selected by the selection condition. When the parameters of the selection condition are changed, the system control device copies the worst condition in the voice response system. If it is determined that the worst condition is found, the spare voice storage unit is changed and the data stored in the voice storage unit determined to be the worst condition is changed. By giving an instruction to copy to a unit, a unit that is likely to fail from a certain factor is predicted, and only that unit is operated as if it is in a duplex configuration state. This has the effect that the service was interrupted during the transfer of the guidance, but can be continued without interruption in a specific unit.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation when switching to a standby audio storage unit occurs in the embodiment.

FIG. 3 is a flowchart illustrating a processing procedure of an operation of selecting an audio storage unit to be copied according to the embodiment;

FIG. 4 is a flowchart showing an operation processing procedure for changing a selection condition parameter in step 203 in FIG. 3;

[Explanation of symbols]

 1 Time Division Switch (SWE) 2 Voice Response System (VRS) 3 Time Division Switch (TSW) 5 System Control Unit (SCU) 11 Talk Line 12 Control Line 31, 32, 33 Highway Interface 41, 42, 43 Voice Processing Unit ( VAU) 50, 51, 52, 53 LAN interface 61, 62, 63 Bus 64 Common bus 71, 72, 73, 74 Audio storage unit (HD)

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[Procedure amendment]

[Submission date] March 4, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

According to the present invention, there is provided a voice response system which is connected to an exchange installed in a public network by a communication line and a control line and provides a voice guidance transmission service to the exchange. The voice response system is time-divisionally connected to the exchange via the communication line.
Switch, N voice processors, system controller
And N active sound storage units and one standby sound system
A voice storage unit, wherein the time-division switch switches the voice processing
Connected to each other via highway interface
Data between the exchange and each of the voice processing units
Switching by time slot unit
The unit is connected to each of the active voice storage units through a bus.
Connected and the backup audio through a common bus
Connected to the storage unit and stored in each of the audio storage units
Decompression of compressed audio data and push button
For transmitting and receiving signals and for each of the highway interfaces
Data to the time-division switch through the
And each of the active voice storage units is
Transmit and receive audio data through the bus, and
The voice storage unit stores the storage data of the affected active voice storage unit.
The same data as the data, and the system controller
If the failed audio storage unit is inaccessible, this audio
The voice processing unit corresponding to the storage unit is stored in the standby system
Control to switch to the storage unit, and
When the storage section is damaged, this voice storage section is connected to the bus
The continued voice processing unit is instructed by the system controller.
To switch to and access the standby voice storage
The data in the standby voice storage is read out and serviced.
Hardware replacement of the affected voice storage unit.
After the replacement is completed, the data stored in the standby voice storage
Copy to the voice storage unit whose hardware has been replaced,
Later, this voice storage unit was used as an active system,
An audio storage unit and the audio processing unit connected by the bus
Is the data stored in the voice storage unit selected according to the selection conditions.
Data to the standby voice storage unit, and
When the parameters are changed, the system controller
Check if it is the worst condition in the voice response system
If the worst condition is determined, the corresponding standby audio
Voice changed storage unit and determined to be the worst condition
Copy the data stored in the storage unit to the standby audio storage unit
And the parameters of the selection conditions are voice
Read / write error of hard disk for storage, hard disk
Disk drive software retry processing and
A voice response service continuation method characterized by including an in-hard disk substitution process is obtained.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Deleted

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Deleted

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Deleted

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Deleted

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Deleted

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

These error information are counted and SC
U5 is notified. In SCU5, each HD 71, 72,
For each 73, each factor illustrated in FIG. 4 (Step S301:
HD driver software retry processing, step S30
2: Alternative sector processing in HD, step S303: read / write error) is counted (steps S304, S
305, S306), and stores the error information of each HD (step S307).

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction contents]

[0044]

As described above, the present invention relates to a voice response system which is connected to an exchange installed in a public network by a communication line and a control line and provides a voice guidance transmission service to the exchange. The system is
A time division switch that is connected to the exchange by passing story lines, N
Audio processing units, a system control unit, N active audio storage units and one standby audio storage unit, and the time division switch is connected to each audio processing unit by a highway interface. The data between the exchange and each voice processing unit is switched in units of time slots, and each voice processing unit is connected to each working voice storage unit via a bus and also used as a backup voice storage unit via a common bus. Connected to the audio storage unit, performs decompression processing of compressed audio data stored in each audio storage unit, transmits and receives a push button signal, transmits audio data to a time division switch through each highway interface, and outputs audio of each active system. The storage unit transmits and receives audio data through the bus, and the standby audio storage unit transmits the affected active audio system. When the affected voice storage unit is inaccessible, the system control unit switches and connects the voice processing unit corresponding to the voice storage unit to the standby voice storage unit. row have, there operational system this standby system access by switching to a voice storage unit of the standby system by an instruction when the voice storage unit has Kakasawa audio processing unit connected by the voice storage unit and the bus system control device The data in the voice storage unit is read out and the service is continued, and after the hardware replacement of the affected voice storage unit is completed, the data stored in the standby voice storage unit is copied to the hardware storage unit whose hardware has been replaced. using this voice storage unit as the working system, Kakasawa voice storage unit and the voice processing unit which is connected by a bus sound of the standby system data stored in the voice storage unit that is selected by the selection constant conditions When the parameters of the selection condition are changed, the system control unit checks whether the condition is the worst in the voice response system and determines that the condition is the worst, and if the condition is determined to be the worst, the corresponding voice storage unit of the standby system the change had line instructions to copy the audio storage unit of the standby system to change the data stored in the voice storage unit is determined to be the worst condition, the parameter selection conditions speech stores
Hard disk read / write error, hard disk
Disk driver software retry processing and hardware
By including the in-disk replacement process, a unit that is likely to fail from a certain factor is predicted, and only that unit is operated as if it were in a duplex configuration. This has the effect that the service was interrupted during the transfer of the guidance, but can be continued without interruption in a specific unit.

Claims (6)

[Claims] 1. A voice response system which is connected to an exchange installed in a public network by a communication line and a control line to provide a voice guidance transmission service to the exchange, wherein the voice response system includes N voice processing units. And an (N + 1) -type redundant audio storage unit connected to each of the audio processing units, wherein only the specific audio storage unit is duplicated. . 2. The voice response service continuation system according to claim 1, further comprising selection means for selecting the specific voice storage unit. 3. A voice response system comprising: a time division switch connected to the exchange via the communication line; N voice processing units; a system control device; N active voice storage units and 1 voice storage unit. A plurality of standby voice storage units, and the time division switch is connected to each of the voice processing units by a highway interface, and switches data between the exchange and each of the voice processing units in time slot units. Each of the audio processing units is connected to each of the active audio storage units via a bus, and is connected to the standby audio storage unit via a common bus to store the compressed audio data stored in each of the audio storage units. And performs transmission / reception of push button signals, and transmits the audio data to the time division switch through the highway interfaces. The active voice storage unit transmits and receives voice data to and from each of the active voice storage units via the bus, and the standby voice storage unit is the same as the storage data of the affected voice storage unit. When the system control device stores data and the affected audio storage unit is inaccessible, the system control device performs control to switch and connect the audio processing unit corresponding to the audio storage unit to the standby audio storage unit. 2. The voice response service continuation method according to claim 1, wherein: 4. An audio processing unit connected to the audio storage unit and the bus is switched to the standby audio storage unit according to an instruction from the system control device when a certain active audio storage unit is damaged. And read the data in the spare voice storage unit to continue the service, and after the hardware replacement of the affected voice storage unit is completed, the data stored in the spare voice storage unit has been replaced. 4. The voice response service continuation system according to claim 3, wherein the voice storage unit is copied to the voice storage unit, and the voice storage unit is thereafter used as an active system. 5. The voice processing unit connected to the affected voice storage unit and the bus by copying data stored in the voice storage unit selected according to a selection condition to the standby voice storage unit. When the parameter of the selection condition is changed, the system control device checks whether the condition is the worst condition in the voice response system, and when it is determined that the condition is the worst condition, the system control device changes the voice storage unit of the corresponding standby system. 5. The voice response service continuation method according to claim 4, wherein an instruction is issued to copy the storage data of the voice storage unit determined to be the worst condition to the changed standby voice storage unit. 6. The parameter of the selection condition includes a read / write error of a hard disk for storing audio, a retry process of hard disk driver software, and a substitute process in the hard disk.
Voice response service continuation method described.