JP2007267219A - Switching system and switching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for avoiding wrong entries to a telephone number of a switching source and a switching destination in instructing switching of a call destination. <P>SOLUTION: A switching system 10 disclosed herein for switching a destination of a call includes: a storage means 15 for storing a telephone number acting as the switching source and a telephone number acting as the switching destination in cross reference with each other in advance; a server 14 that searches one or two or more telephone numbers stored in the storage means 15 stored in cross reference with the telephone number acting as the switching source upon the receipt of the telephone number acting as the switching source from a terminal 31 at the outside of the switching system, returns one or two or more telephone numbers to be searched to the terminal 31 as telephone numbers of switching destination candidates, transmits the switching source number, the switching destination number, and the switching instruction upon the receipt of the telephone number selected as the switching destination from the terminal 31 and the switching instruction; and a dialing means 13 for transmitting a tone signal corresponding to the switching source number, the switching destination number and the switching instruction to a switching center 22 at the outside of the switching system upon the receipt of the switching source number, the switching destination number and the switching instruction from the server 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a switching system and a switching method for switching destinations of telephone numbers.

In recent years, IP telephones have been introduced, but IP telephones cannot be used during power outages. For this reason, a technique for transferring a telephone number assigned to an IP telephone in a normal state to an analog telephone in the event of a power failure is disclosed (for example, see Patent Document 1).
JP 2005-5807 A

  However, the conventional technique has a problem that an operation mistake may occur because the destination telephone number must be manually input.

  The present invention has been made in view of such circumstances, and is intended to prevent mistakes in switching work even when a telephone number destination is switched in an emergency.

  A first feature of the present invention is a switching system for switching a call destination, a storage means for storing a telephone number as a switching source and a telephone number as a switching destination in advance, and a storage system outside the switching system. When a switching source telephone number is received from the terminal, one or two or more telephone numbers stored in the storage means in association with the switching source telephone number are searched, and the searched one or two or more telephones When the telephone number selected as the switching destination and the switching instruction are received from the terminal as the switching destination candidate telephone number, the switching source number, the switching destination number, and the switching instruction are transmitted from the server. Upon receiving the original number, the switching destination number, and the switching instruction, the call means for transmitting the tone signal corresponding to the number and the instruction to the switching center outside the switching system; Certain to be equipped. The tone signal includes DTMF (Dial Tone Multi Frequency). The “switching center” is an existing technology that can change the correspondence between a telephone number and a telephone line when receiving a switching source telephone number, a switching destination telephone number, and a switching instruction. For example, when the first telephone number is assigned to the first telephone line and the second telephone number is assigned to the second telephone line, the switching center sets “switching source: first telephone number, After receiving the switching instruction “switching destination: second telephone number” and executing the switching, a call made with the first telephone number as the destination is received by the terminal connected to the second telephone line. .

  A second feature of the present invention is a switching system for switching a call destination, and a plurality of switching destination pattern IDs for a group ID and two or more switching sources for each switching destination pattern ID. Storage means for storing a telephone number in advance in association with one switching destination telephone number for each switching source telephone number, and storage means in association with the group ID when receiving a group ID from a terminal outside the switching system When a plurality of switching destination pattern IDs stored in is searched, a plurality of found switching destination pattern IDs are returned to the terminal, and any one switching destination pattern ID and a switching instruction are received from the terminal, the switching is performed. The server that transmits the switching source number, switching destination number, and switching instruction stored in the storage means in association with the destination pattern ID, and the server For example the original number, upon receiving the switching destination number and switching instruction is to provided a call-unit for transmitting to the switching center of the outside of the system switches the tone signals corresponding to these numbers and instructions, a.

  The third feature of the present invention is that when the server further receives any one switching destination pattern ID and display instruction from the terminal, the switching source number and switching destination stored in the storage means in association with the switching destination pattern ID. Returning the number to the terminal.

  According to a fourth aspect of the present invention, the switching system further includes voice recognition means, and the server sends a call instruction to the switching source telephone number to the call means after a predetermined time has elapsed after transmitting the switch instruction. When the call means receives the call instruction, the call means calls the switching source telephone number, transfers the response voice from the destination to the voice recognition means, and the voice recognition means converts the response voice into text, Compare the response voice that has been converted to text and the response voice text that is stored in advance for normal switching, and if the similarity between the two texts is equal to or greater than a threshold, it is determined that switching has been performed normally. If the degree is less than the threshold value, it is determined that the switching has not been performed normally.

  According to the first feature of the present invention, an erroneous input of a switching destination telephone number in an external terminal is avoided by presenting a candidate of a switching destination telephone number to an external terminal and allowing the switching destination telephone number to be selected from the candidates. be able to. Further, by converting the selected telephone number or switching instruction into a tone signal such as DTMF by the caller, it is possible to automatically switch the destination.

  Here, “automatic” means, for example, that the tone signal corresponding to “0” is transmitted by pressing down the “0” button, the tone signal corresponding to “1” is transmitted by pressing down the “1” button, By pressing the “2” button and sending the tone signal corresponding to “2”, the numerical data of “0”, “1” and “2” is passed to the caller means. , Tone signal corresponding to “0”, tone signal corresponding to “1”, and tone signal corresponding to “2” are transmitted in succession.

  According to the second feature of the present invention, a plurality of patterns of switching destination telephone number candidates are presented to an external terminal, and when any one of the patterns is selected, it is associated with the selected pattern. Switching is performed collectively from the plurality of switching source telephone numbers to the switching destinations associated with each switching source number. As a result, it is possible to improve the efficiency of the switching work in the external terminal and avoid erroneous input of the switching destination telephone number.

  According to the third feature of the present invention, when a plurality of patterns of switching destination telephone numbers are presented to an external terminal, and any one of the plurality of patterns is selected, it is associated with the selected pattern. A plurality of switching source telephone numbers are returned to the external terminal. As a result, the switching content can be confirmed on the external terminal side before switching is instructed.

  According to the fourth aspect of the present invention, it is possible to confirm whether or not switching has been performed normally.

  The best mode for carrying out the present invention will be described below with reference to the drawings. The following description is merely an example, and the technical scope of the present invention is not limited by the following description.

  FIG. 1 is a diagram showing an overall configuration of a switching system according to an embodiment of the present invention. As shown in FIG. 1, the switching system 10 includes a voice recognition device 12, a caller device 13, a Web server 14, and a database (DB) 15. The voice recognition device 12, the caller device 13, and the web server 14 are connected via a LAN 16. A VoIPGW (Voice over Internet Protocol Gateway) 11 is also connected to the LAN 16. In addition, an instruction can be sent to the Web server 14 from a user terminal 31 such as a mobile phone, a PHS (Personal Handyphone System), a PDA (Personal Digital Assistance), or a PC (Personal Computer) using a Web browser.

  The web server 14 receives a switching instruction from the web browser activated on the user terminal 31. A switching source telephone number and a switching destination telephone number are also received together with the switching instruction. Further, the Web server 14 can cause the caller 13 to send a switching command, a switching source telephone number, and a switching destination telephone number to the switching center 22, and can cause the calling unit 13 to call the switching source telephone number. . Furthermore, the Web server 14 can receive from the voice recognition device 12 whether or not switching has been normally performed (switching result).

  The voice recognition device 12 receives the response voice received by the caller device 13 from the destination telephone (the switching destination telephone when the switching is performed normally. The switching source telephone when the switching is not performed normally). Can be converted into a text file and compared with a text file registered in advance. Then, the contents of the response voice converted into a text file are compared with the contents of the text file registered in advance, and if the similarity between the contents of both files is equal to or greater than the threshold, it is determined that the switching has been performed normally. If the similarity of the file contents is less than the threshold, it is determined that the switching has been performed normally. Then, the determination result (comparison result) is returned to the Web server 14.

  Calling device 13 calls DTMF (Dial Tone Multi Frequency) to telephone line switching center 22 via VoIPGW 11 and public network 21 according to the switching source telephone number, switching destination telephone number and switching instruction received from Web server 14. To do. In addition, an automatic voice response (IVR) returned from the call destination or an operator's voice is passed to the voice recognition device 12. Further, in order to confirm that the line has been switched, a call is made to the switching source telephone number after the line switching instruction.

  FIG. 2 is a flowchart showing a processing flow of the switching system according to the embodiment of the present invention. As shown in FIG. 2, in step S101, the Web server 14 receives a line switching instruction. It is assumed that the line switching instruction is sent from a Web browser activated on the user terminal 31.

  FIGS. 3A and 3B show examples of screens displayed on the display device of the user terminal when switching is instructed using a Web browser. First, as shown in FIG. 3A, a user ID and a password are input on the login screen 41 using an input means (not shown) such as a keyboard, and a “login” button 42 is clicked to log in.

  Next, as shown in FIG. 3B, when a switching source telephone number is input on the switching instruction screen 43, candidates for switching destination telephone numbers stored in advance in association with the switching source telephone number are displayed. After selecting one of the candidates, the “switch execution” button 44 is clicked. Such an operation is performed on the user terminal 31, and a switching instruction is sent to the Web server 14.

  FIGS. 4A and 4B show other examples of screens displayed on the display device of the user terminal when switching is instructed using a Web browser. First, as shown in FIG. 4A, a user ID and a password are input on a login screen 51 using an input means (not shown) such as a keyboard, and a “login” button 52 is clicked to log in.

  Next, as shown in FIG. 4B, when the branch number or branch name (group ID) of the branch that is the switching source is input on the switching instruction screen 53, the branch number or branch name (group ID) is associated with the branch number. A plurality of switching destination pattern candidates stored in advance are displayed. When one pattern is selected from a plurality of candidates and the “display” button 54 is clicked, the contents of the selected pattern are displayed.

For example, pattern 1 is the case of switching within the same branch where the area code and the city code do not change,
Switch source Switch destination
xx-xxxx-xxx1 ⇒ xx-xxxx-yyy1
xx-xxxx-xxx2 ⇒ xx-xxxx-yyy2
xx-xxxx-xxx3 ⇒ xx-xxxx-yyy3
It becomes.

For example, pattern 2 is for switching between branches where the area code changes.
Switch source Switch destination
xx-xxxx-xxx1 ⇒ y4-yyyy-yyyy
xx-xxxx-xxx2 ⇒ y5-yyyy-yyyy
xx-xxxx-xxx3 ⇒ y6-yyyy-yyyy
It becomes.

For example, pattern 3 is a case of switching between branches where the area code does not change but the city code changes.
Switch source Switch destination
xx-xxxx-xxx1 ⇒ xx-yyy7-yyyy
xx-xxxx-xxx2 ⇒ xx-yyy8-yyyy
xx-xxxx-xxx3 ⇒ xx-yyy9-yyyy
It becomes. After confirming the contents of the displayed pattern and selecting one of the patterns, the “switch execution” button 55 is clicked. Such an operation is performed on the user terminal 31, and a switching instruction is sent to the Web server 14.

  In step S103 of FIG. 2, the Web server 14 transmits a command for switching the line, the telephone number of the switching source, and the telephone number of the switching destination to the calling apparatus 13. In step S105, the call forwarding device 13 places a call to the telephone line switching center 22 and instructs to switch from the switching source telephone number to the switching destination telephone number. Upon receiving the switching instruction, the telephone line switching center 22 changes the destination of the switching source telephone number to the switching destination telephone number.

  As a result, when a call is made to the telephone number of the switching source, the telephone line switching center 22 issues a call with the switching destination telephone set as the receiving destination, and therefore receives the incoming call to the switching destination telephone set.

  In step S107, in order to confirm that the switching has succeeded, the Web server 14 instructs the calling apparatus 13 to call the switching source telephone number. In step S109, the calling device 13 calls the switching source telephone number. In step S111, the calling apparatus 13 receives a response from the destination telephone. In step S <b> 113, the calling device 13 passes the response voice received from the destination telephone to the voice recognition device 12.

  In step S115, the speech recognition device 12 converts the response speech received from the call device 13 into a text file and compares it with a text file stored in advance in storage means (not shown). It is determined whether or not this is the case. If the similarity between the two texts is equal to or greater than the threshold, it is determined that the switching has been performed normally. If the similarity between the two texts is less than the threshold, it is determined that the switching has not been performed normally. Then, the determination result (check result) is sent to the Web server 14.

  For example, (1) a first telephone number is assigned to a first telephone line, a second telephone number is assigned to a second telephone line, and (2) is connected to the first telephone line. The frequency waveform (first waveform) of the response voice when it arrives at the terminal and the frequency waveform (second waveform) of the response voice when it arrives at the terminal connected to the second telephone line are stored in advance. (3) It is assumed that a process of switching the destination of the first telephone number to a terminal connected to the second telephone line is instructed. Then, after switching is instructed, a call is generated with the first telephone number as the destination, and the frequency waveform of the response voice returned from the destination is the same as or similar to the first waveform Determines that the call has arrived at the terminal connected to the first telephone line, that is, switching has failed. On the other hand, when the frequency waveform of the response voice returned from the destination is the same as or similar to the second waveform, the incoming call arrives at the terminal connected to the second telephone line, that is, the switching has succeeded. Judge.

  Also, instead of making a determination based on the similarity of frequency waveforms, (1) the response speech is converted into text data using an existing speech recognition engine, and (2) the text is a vector (sentence vector) in a multidimensional space. To obtain the similarity and distance between sentences (text data obtained from response speech and text data stored in advance) based on the sentence vector, and (3) whether switching has been performed normally You may judge.

  In step S117, the Web server 14 writes the check result received from the speech recognition apparatus 12 in the database 15, and transmits the check result display screen configuration information described in HTML (HyperText Markup Language) to the user terminal 31.

  FIG. 3C shows an example of a screen displayed on the display device of the user terminal after instructing switching using a Web browser. When the user terminal 31 receives the check result display screen configuration information from the Web server 14, as shown in FIG. 3C, the display device of the user terminal 31 displays the switching source telephone number, the switching destination telephone number, and “ Message is displayed. "

  FIG. 4C shows another example of a screen displayed on the display device of the user terminal after instructing switching using a Web browser. When the user terminal 31 receives the check result display screen configuration information from the Web server 14, the display device of the user terminal 31 includes a branch number, a switching source telephone number, a switching destination telephone number, and the like as shown in FIG. The message “Changed as above” is displayed.

  FIG. 5 shows an example of the contents stored in the DB. FIG. 5 corresponds to FIGS. 3 (b) and 3 (c). As shown in FIG. 5, the switching source telephone number and the switching destination telephone number are stored in advance in the DB. Specifically, the switching source “xx-xxxx-xxxx” stores the switching destination “yy-yyyy-yyyy” and “zz-zzzz-zzzz” in association with each other. For this reason, when the telephone number “xx-xxxx-xxxx” is input as the switching source in FIG. 3B, the telephone numbers “yy-yyyy-yyyy” and “zz-zzzz-zzzz” are the switching destination candidates. Is displayed. Then, when “yy-yyyy-yyyy” is selected as the switching destination, and the “switch execution” button 44 is clicked and switching is performed normally, as shown in FIG. 5, it corresponds to “yy-yyyy-yyyy”. "2" indicating that the switching has been normally performed is written in the status to be executed. On the other hand, the status corresponding to “zz-zzzz-zzzz” not selected as the switching destination remains “0” indicating that switching has not been performed.

  FIG. 6 shows another example of the contents stored in the DB. FIG. 6 corresponds to FIGS. 4 (b) and (c). As shown in FIG. 6, the branch number, branch name, transfer destination pattern, switching source telephone number, and switching destination telephone number are stored in the DB in advance. Specifically, the branch number “06” is stored in association with the branch name “Osaka branch” and the switching destination patterns “1”, “2”, and “3”. The switching source “xx-xxxx-xxxx1”, “xx-xxxx-xxxx2”, “xx-xxxx-xxxx3”, etc. are stored in association with any of the switching destination patterns “1”, “2”, “3”. Has been. In the switching destination pattern “1”, switching destinations “xx-xxxx-yyy1”, “xx-xxxx-yyy2”, “xx-xxxx-yyy3”,... The switching destination pattern “2” stores switching destinations “y4-yyyy-yyyy”, “y5-yyyy-yyyy”, “y6-yyyy-yyyy”. In the switching destination pattern “3”, switching destinations “yy-yyy7-yyyy”, “yy-yyy8-yyyy”, “yy-yyy9-yyyy”,...

  When “06” is input as the branch number in FIG. 4B, “Pattern 1”, “Pattern 2”, and “Pattern 3” are displayed as candidates for the switching destination pattern. When the “Display” button 54 is clicked with “Pattern 1” selected, “xx-xxxx-yyy1”, “xx-xxxx-yyy2”, “xx-xxxx-yyy3”... Is displayed. When the “Display” button 54 is clicked with “Pattern 2” selected, “y4-yyyy-yyyy”, “y5-yyyy-yyyy”, “y6-yyyy-yyyy”... Is displayed. When the “Display” button 54 is clicked with “Pattern 3” selected, “yy-yyy7-yyyy”, “yy-yyy8-yyyy”, “yy-yyy9-yyyy”,... Is displayed.

  When the “switch execution” button 55 is clicked in a state where “pattern 1” is selected and switching is performed normally, as shown in FIG. 6, “xx-xxxx-yyy1” and “xx-xxxx-yyy2” , “2” indicating that the switching has been normally performed is written in the status corresponding to “xx-xxxx-yyy3”. On the other hand, the statuses corresponding to “y4-yyyy-yyyy”, “y5-yyyy-yyyy”, “y6-yyyy-yyyy”, etc., not selected as the switching destination remain “0”.

  When the voice recognition device 12 determines that the switching has not been performed normally, a number indicating that fact (for example, “3”) is written as the status. In addition, after the “switch execution” button 44 or 55 is clicked, a number (for example, a switch instruction is instructed) until the voice recognition device 12 determines whether the switching has been normally performed (for example, “1”) may be written as the status.

  As described above, according to the embodiment of the present invention, the switching destination telephone number is erroneously input in the external terminal by presenting the switching destination telephone number candidates to the external terminal and selecting the switching destination telephone number from the candidates. Can be avoided. Further, by converting the selected telephone number or switching instruction into a tone signal such as DTMF by the caller, it is possible to automatically switch the destination. Furthermore, it is possible to compare the response voice from the destination and the pre-registered text and confirm whether or not the switching has been normally performed based on the similarity.

  In the above embodiment, the processing after the user can transmit a line switching instruction from the user terminal has been described. The following processing may be performed before the user can transmit a line switching instruction from the user terminal.

1) The user calls from the user terminal to the service center for switching settings,
2) The user terminal receives voice data requesting input of a telephone number from the service center, and a voice such as “Please enter the contracted telephone number” is output from the speaker of the user terminal.
3) Send a tone signal of the contract telephone number from the user terminal to the service center,
4) The user terminal receives voice data requesting input of a password from the service center, and a voice such as “Please enter password” is output from the speaker of the user terminal.
5) Send a password tone signal from the user terminal to the service center,
6) The user terminal receives voice data for requesting selection of start or stop of the switching process from the service center, and a voice such as “Please input 1 to start the switching process and 0 to stop” from the user terminal speaker. Output,
7) Send a switching process start or stop tone signal from the user terminal to the service center,
8) The user terminal receives voice data notifying the start or stop of the switching process from the service center, and the voice such as “Starts the switching process” or “Stops the switching process” is output from the speaker of the user terminal. .

It is a figure showing the whole switching system composition concerning an embodiment of the invention. It is a flowchart which shows the flow of a process of the switching system which concerns on embodiment of this invention. (A) And (b) shows an example of a screen displayed on the display device of the user terminal when switching is instructed using a Web browser, and (c) is displayed on the display device of the user terminal after instructing switching. An example of the screen to be displayed is shown. (A) And (b) shows the other example of the screen displayed on the display apparatus of a user terminal, when switching is instruct | indicated using a web browser, (c) is the display apparatus of a user terminal after instruct | indicating switching Another example of the screen displayed in FIG. An example of storage contents of a DB is shown. The other example of the storage content of DB is shown.

Explanation of symbols

10 ... Switching system 11 ... VoIPGW
12 ... Voice recognition device 13 ... Calling device 14 ... Web server 15 ... DB
16 ... LAN
21 ... Public network 22 ... Telephone line switching center 31 ... User terminal

Claims (8)

A switching system for switching destinations of outgoing calls,
A storage means for preliminarily associating and storing a telephone number as a switching source and a telephone number as a switching destination;
When a telephone number as a switching source is received from a terminal outside the switching system, one or two or more telephone numbers stored in the storage means are searched in association with the telephone number as the switching source to find one Or, when two or more telephone numbers are returned to the terminal as switching destination candidate telephone numbers and the telephone number selected as the switching destination and the switching instruction are received from the terminal, the switching source number, the switching destination number, and the switching instruction are transmitted. And a server to
Upon receiving the switching source number, the switching destination number and the switching instruction from the server, the call means for transmitting the tone signal corresponding to the number and the instruction to the switching center outside the switching system;
A switching system comprising: A switching system for switching destinations of outgoing calls,
A plurality of switching destination pattern IDs for the group ID, two or more switching source telephone numbers for each switching destination pattern ID, and one switching destination telephone number for each switching source phone number in advance. Storage means for storing in association;
When a group ID is received from a terminal outside the switching system, a plurality of switching destination pattern IDs associated with the group ID and stored in the storage unit are searched, and the found plurality of switching destination pattern IDs are stored in the terminal. When one of the switching destination pattern IDs and the switching instruction is received from the terminal, the switching source number, the switching destination number, and the switching instruction stored in the storage unit are transmitted in association with the switching destination pattern ID. Server,
Upon receiving the switching source number, the switching destination number and the switching instruction from the server, the call means for transmitting the tone signal corresponding to the number and the instruction to the switching center outside the switching system;
A switching system comprising:   The server further returns a number of switching destination pattern IDs to the terminal. (1) When any one switching destination pattern ID and a display instruction are received from the terminal, the server associates the switching destination pattern ID with the switching destination pattern ID and stores the storage destination pattern ID. 3. The switching system according to claim 2, wherein a switching source number and a switching destination number stored in the means are returned to the terminal. The switching system further comprises voice recognition means,
The server transmits a call instruction to the switching source telephone number to the call means after a predetermined time has passed since the switch instruction was sent,
When the call means receives the call instruction, it makes a call to the switching source telephone number, transfers the response voice from the destination to the voice recognition means,
The voice recognition means converts the response voice into text, compares the texted response voice with a response voice text stored at normal switching stored in advance, and switches if the similarity between the two texts is equal to or greater than a threshold value. 4. The switching system according to claim 1, wherein the switching is determined to be performed normally, and if the similarity between the two texts is less than the threshold, it is determined that the switching has not been performed normally. . A switching method for switching an incoming call destination using a switching system including a storage unit, a server, and a calling unit,
The storage means stores a telephone number as a switching source and a telephone number as a switching destination in association with each other in advance,
When the server receives a telephone number as a switching source from a terminal outside the switching system, the server searches for and searches for one or more telephone numbers stored in the storage means in association with the telephone number as the switching source. When the telephone number selected as the switching destination and the switching instruction are received from the terminal, the switching source number, the switching destination number, Sending a switching instruction to the call means,
When the call means receives a switching source number, a switching destination number, and a switching instruction from the server, the call means transmits a tone signal corresponding to the number and the instruction to a switching center outside the switching system.
A switching method characterized by that. A switching method for switching a destination of a call using a switching system including a storage unit, a server, and a calling unit,
The storage means includes a plurality of switching destination pattern IDs for the group ID, two or more switching source telephone numbers for each switching destination pattern ID, and one switching destination for each switching source phone number. Is stored in advance in association with
When the server receives a group ID from a terminal outside the switching system, the server searches for a plurality of switching destination pattern IDs stored in the storage means in association with the group ID, and finds a plurality of switching destination pattern IDs found. Is returned to the terminal, and when any one switching destination pattern ID and switching instruction are received from the terminal, the switching source number, switching destination number and switching stored in the storage means in association with the switching destination pattern ID Send instructions to the call means,
When the call means receives a switching source number, a switching destination number and a switching instruction from the server, the call means transmits a tone signal corresponding to the number and the instruction to a switching center outside the switching system.
A switching method characterized by that.   When the server further receives any one switching destination pattern ID and a display instruction from the terminal, the server associates the switching source number and the switching destination number stored in the storage unit in association with the switching destination pattern ID. The switching method according to claim 6, wherein the switching method is a reply. The switching system further comprises voice recognition means,
The server transmits a call instruction to the switching source telephone number to the call means after a predetermined time has passed since the switch instruction was sent,
When the call means receives the call instruction, it makes a call to the switching source telephone number, transfers the response voice from the destination to the voice recognition means,
The voice recognition means converts the response voice into text, compares the texted response voice with a response voice text stored at normal switching stored in advance, and switches if the similarity between the two texts is equal to or greater than a threshold value. 8. The switching method according to claim 5, wherein the switching is determined to be performed normally, and if the similarity between the two texts is less than the threshold, it is determined that the switching has not been performed normally. .

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