JP5143062B2 - Method for determining illegal call from malicious third party and automatic telephone answering device - Google Patents

Description

  The present invention relates to a method for determining an illegal call from a malicious third party and an automatic telephone answering apparatus.

  Conventionally, a called telephone has an answering function and a number display function in order to confirm a caller before a call. In the case of the answering machine function, even when at home, after confirming the voice of the other party, you can respond. In the case of the number display function, it is possible to respond after confirming the caller ID. However, in the case of an answering machine, the caller often disconnects the call without speaking. In the case of the number display function, there are many non-notifications of caller numbers and unknown numbers.

  In recent years, many fraud damages using telephones, such as wire fraud, have occurred. Despite the fact that many of the victims are aware of such incidents, they are upset by the conversation with the criminal and lack judgment. At this time, the victim often ignores even the possibility of fraud by a third party. This is because the victim misrecognizes the conversation with the criminal as a conversation about a close relative. In order to deal with such an incident, it is preferable to determine the possibility of an unauthorized call from a malicious third party immediately after an incoming call to the telephone and before starting a call.

  There is a technique for transferring a call to a call center before the incoming call (see, for example, Patent Document 1). According to this technology, the call center side operator receives the call on behalf of the called party. When it is determined that there is a possibility of an unauthorized call from a malicious third party, the business operator notifies the callee to that effect.

  In addition, there is a technique for referring to a group database based on affiliation information referred to by a caller and determining whether the affiliation information includes incorrect information (see, for example, Patent Document 2). If incorrect information is included, the callee is notified that there is a possibility of an unauthorized call from a malicious third party. Here, from the viewpoint of personal information protection, disclosure of the organization database becomes a problem.

  Furthermore, there is a technique for analyzing the utterance content of a caller by voice recognition processing (see, for example, Patent Document 3). According to this technique, it is determined whether or not the call is illegal by comparing the account number dictated by the caller with pre-registered fraud account information. Also, the voice characteristics of the caller and the voice characteristics of the criminal registered in advance are collated. Further, it is determined whether or not an illegal keyword registered in advance is included in the utterance content of the caller. An e-mail describing the result of comprehensive determination is sent to a pre-registered e-mail address.

  Furthermore, there is a technique for notifying a supporter other than the callee (for example, a close relative) of the possibility of an illegal call at the callee (for example, see Patent Document 4). According to this technique, even if the called party does not recognize that the call is an unauthorized call from a malicious third party, the close relative can prompt the called party to take a calm response.

JP 2006-173710 A JP 2007-228384 A JP 2008-210085 A JP 2007-159043 A

  According to the technique described in Patent Document 1, the human cost of the call center is required. According to the technique described in Patent Document 2, a group database is required. According to the technique described in Patent Document 3, a highly functional collation engine is required to identify the criminal. Moreover, according to the technique described in Patent Document 4, a human supporter is required.

  Therefore, the present invention provides a method and an automatic telephone answering apparatus that can determine an illegal call from a malicious third party in a sequence as simple as possible using the answering machine function and the called party address function. The purpose is to do.

According to the present invention, when a telephone call is received, a malicious third party can call a caller's close relative (legitimate caller) using a telephone automatic answering apparatus that automatically answers the caller. A method for determining an illegal call to be made with a disguise ,
Automatic telephone answering device
An address storage unit for storing the name of a legitimate caller;
An answering message storage unit that pre-records the first answering message immediately after the incoming call according to the voice of the called party;
A voiceprint information storage unit for storing voiceprint information of a legitimate caller,
Automatic telephone answering device
The first response message recorded in the response message storage unit is called so that a malicious third party caller does not feel that he / she is talking to the telephone automatic answering device when the call is received. A first step of speaking to the person in charge,
A second step of extracting text from the caller's utterance by speech recognition processing;
A third step of determining whether the text includes a legitimate caller name stored in the address storage unit;
When the text includes a valid caller name, a fourth determination is made as to whether or not the caller's voice matches the voiceprint information of the valid caller name stored in the voiceprint information storage unit. Steps,
And a fifth step of notifying the callee of the telephone that there is a possibility of an illegal call when the voice of the caller does not match the voiceprint information of the voiceprint information storage unit. To do.

According to another embodiment of the fraud determination method of the present invention,
The response message storage unit further stores a second response message for asking an unspecified caller a question,
For the fourth step, if the text does not contain a legitimate caller name,
It is also preferable that the second response message for asking an unspecified caller, which is stored in the second response message storage unit, is uttered and the process proceeds to the second step.

According to another embodiment of the fraud determination method of the present invention,
The telephone automatic answering apparatus further includes an illegal call keyword storage unit in which an illegal call keyword is stored in advance.
For the third step, it is further determined whether or not the text includes an illegal call keyword stored in the illegal call keyword storage unit;
For the fourth step,
The first sub-step is that the unspecified caller stored in the second reception message storage unit when the text does not include the legitimate caller name and the illegal call keyword is included. Say a second response message that asks
The third sub-step further determines whether or not the text includes an illegal call keyword stored in the illegal call keyword storage unit,
When the text includes an illegal call keyword, it is also preferable to notify the user of the telephone that there is a possibility of an illegal call.

According to another embodiment of the fraud determination method of the present invention,
The response message storage unit further stores a second response message for asking a different question for each legitimate caller name,
For the fifth step, if the caller's utterance does not match the voiceprint information in the voiceprint information storage unit,
A first sub-step of speaking a second response message corresponding to the legitimate caller name stored in the response message storage unit;
A second sub-step of extracting text from the caller's utterance by a speech recognition processor;
A third sub-step for determining whether or not the text includes an answer keyword stored in the answer keyword storage unit and corresponding to the second response message;
It is also preferable to have a fourth sub-step for notifying the callee of the telephone that there is a possibility of an illegal call when the answer keyword is not included in the text.

  According to another embodiment of the unauthorized call determination method of the present invention, the function of the automatic telephone answering device is installed in the mobile phone, or the automatic telephone answering device is in the home network or in the telecommunications carrier equipment. It is also preferred that they are arranged.

According to the present invention, when a telephone call is received, a call to the calling party is made in order to determine an illegal call that a malicious third party calls while impersonating the called party 's close relative (legitimate calling party) . In the automatic telephone answering device that automatically answers,
An address storage means for storing a legitimate caller name;
A response message storage means for pre-recording a first response message immediately after an incoming call according to the voice of the called party;
Voiceprint information storage means for storing voiceprint information of a legitimate caller name;
The first response message recorded in the response message storage unit is called so that a malicious third party caller does not feel that he / she is talking to the telephone automatic answering device when the call is received. First response message utterance means for uttering to the person side,
Speech recognition processing means for extracting text from the caller's utterance;
First text determination means for determining whether or not the text includes a valid caller name stored in the address storage unit;
If the text includes a legitimate caller name, the voiceprint matching means for matching the voice of the caller and the voiceprint information of the legitimate caller name stored in the voiceprint information storage unit;
When the caller's voice and the voiceprint information stored in the voiceprint information storage unit do not match, the caller has a wrong call notification means for notifying the callee of the telephone that there is a possibility of a wrong call. To do.

According to another embodiment of the telephone automatic answering apparatus of the present invention,
The answering message storage means further stores a second answering message for asking an unspecified caller a question,
If the first text determining means determines that the text does not contain the name of the legitimate caller, the second answer is stored in the second answer message storage unit and asks the unspecified caller a question. It is also preferable that the apparatus further comprises second response message utterance means for uttering a message.

According to another embodiment of the telephone automatic answering apparatus of the present invention,
And further includes an unauthorized call keyword storage means for storing an unauthorized call keyword in advance,
The first text determination means further determines whether or not the text includes an illegal call keyword stored in the illegal call keyword storage unit,
The second response message utterance means, when the text does not include the legitimate caller name and the illegal call keyword, includes the unspecified call stored in the second response message storage unit. Say a second answer message that asks the caller a question,
A second text determination means for further determining whether or not the text includes an unauthorized call keyword stored in the unauthorized call keyword storage unit;
The illegal call notification means preferably notifies the user of the telephone that there is a possibility of an illegal call when the text includes an illegal call keyword.

According to another embodiment of the telephone automatic answering apparatus of the present invention,
The response message storage means further stores a second response message for asking a different question for each legitimate caller name,
When the caller's utterance and the voiceprint information stored in the voiceprint information storage unit do not match, the second response message utterance means outputs the second response corresponding to the legitimate caller name stored in the response message storage unit. Say a message,
The second text determining means determines whether or not the text includes an answer keyword corresponding to the second response message stored in the answer keyword storage unit;
If the answer keyword is not included in the text, the unauthorized call determination means preferably notifies the callee of the telephone that there is a possibility of an unauthorized call.

  According to another embodiment of the telephone automatic answering apparatus of the present invention, it is also preferable that the telephone automatic answering apparatus is installed in a mobile phone, or is arranged in a home network or a communication carrier facility.

  According to the illegal call determination method and the automatic telephone answering apparatus of the present invention, by comparing the voice print information of the malicious third party that is naturally uttered with the voice print information of the legitimate caller, Can be determined. A caller who is a malicious third party does not feel that he / she is talking to an automatic telephone answering device.

It is a system configuration diagram in the present invention. It is a 1st sequence diagram in this invention. FIG. 3 is a sequence diagram for asking a caller name for the first sequence in FIG. 2. It is a 2nd sequence diagram in this invention. It is a 3rd sequence diagram in the present invention. It is a functional block diagram of the telephone automatic answering apparatus in this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram according to the present invention.

  Assume a malicious third party such as a transfer fraud as a caller. The caller knows not only the caller's phone number, but also the names of the caller's close relatives. The caller performs a fraudulent action against the caller using the close name.

  According to the present invention, the telephone automatic answering apparatus 1 that automatically answers a caller is provided. The telephone automatic answering apparatus 1 may be provided in a telecommunications carrier facility of a telephone network or a home network, or may be mounted on a mobile phone. The automatic telephone answering apparatus 1 of the present invention can determine an unauthorized call from a malicious third party in a sequence as simple as possible using the answering machine function and the called party address function.

  FIG. 2 is a first sequence diagram in the present invention.

The sequence of FIG. 1 is a scenario in which the caller makes a call impersonating someone other than the caller's close relative.
[Scenario 1]
(System) “Hello”
(The other party) “Oh, it ’s Yukie”

(S201) The telephone automatic answering apparatus 1 has an answering message storage unit, and records the first answering message in advance by the caller's utterance from the telephone 3. The first response message is a response message immediately after an incoming call, for example “Hello”.

  The automatic telephone answering apparatus 1 has a voiceprint information storage unit, and also stores voiceprint information of a legitimate caller. The voiceprint information is obtained in advance from voice data uttered by a legitimate caller. For example, the voiceprint information is extracted from the voice data that “Yukie”, who is a close friend, utters “Yukie but Ido”.

  The voiceprint information is a parameter obtained by extracting personal features such as vocal cords and vocal tracts by frequency analysis. Voiceprint matching is a technique for authenticating a registrant by matching with a pattern of registered voiceprint information.

(S202) It is assumed that a malicious third party makes a call from the telephone 2 to the telephone number of the called party. At this time, the automatic telephone answering apparatus 1 installed in the telephone network intercepts the call and makes it arrive. As a result, the telephone automatic answering apparatus 1 and the calling telephone 2 are call-connected.

(S203) At the time of an incoming call, the telephone automatic answering apparatus 1 utters the first answer message “Hello” recorded in the answer message storage unit to the caller side. The caller's telephone will say “Hello” in the caller's voice.

(S204) Here, the caller speaks. According to FIG. 2, it is assumed that, for example, “Oh, it is Yukie but”. “Yukie” is the callee's family. That is, a caller who is a malicious third party is trying to fraud with the name “Yukie”.

  The telephone automatic answering apparatus 1 acquires “Aki, Yukie but” as uttered by the caller as voice data. At this time, voiceprint information in the caller's utterance is also detected.

(S205) The telephone automatic answering apparatus 1 uses the voice recognition processing unit to extract text from the voice data. The text includes “Yukie”.

  The telephone automatic answering apparatus 1 has an address storage unit and stores a valid caller name. The address storage unit is, for example, an address book of a mobile phone, and a name (may be a nickname) stored therein can be said to be a legitimate caller name.

(S206) The telephone automatic answering apparatus 1 determines whether or not the text obtained by voice recognition includes the legitimate caller name stored in the address storage unit. An address storage unit such as an address book includes “Yukie” as a valid caller name for the called party.

(S207) Next, the telephone automatic answering apparatus 1 determines whether or not the caller's utterance matches the voiceprint information of the valid caller name stored in the voiceprint information storage unit.

(S208) If the voice of the caller does not match the voiceprint information in the voiceprint information storage unit, the caller of the telephone is notified that there is a possibility of an illegal call. For example, the characters “This phone may be an illegal call” are transmitted to the called telephone 3. For example, it may be transmitted by a short mail based on a call connection.

  Thereafter, the telephone automatic answering apparatus 1 connects or disconnects the call from the caller. Whether there is a possibility of an illegal call is to connect or disconnect the call based on the setting of the called party.

  FIG. 3 is a sequence diagram for asking the caller name for the first sequence in FIG.

  According to FIG. 3, a message for asking a question to an unspecified caller is recorded in advance from the telephone 3 to the automatic telephone answering apparatus 1 as the second answering message. The questions for unspecified callers are, for example, “How is it?” “What is your business?”

(S301) This is a case in which the calling party does not name the called party after S201 to S203 in FIG. Suppose that a caller utters, for example, “Oh, I am”.

(S302) The telephone automatic answering apparatus 1 acquires “Ah, but I” uttered by the caller as voice data. Then, the telephone automatic answering apparatus 1 uses the voice recognition processing unit to extract text from the voice data.

(S303) The telephone automatic answering apparatus 1 determines whether or not the text includes the name of the legitimate caller stored in the address storage unit.

(S304) The telephone automatic answering apparatus 1 utters the second answer message for the unspecified caller because the text does not include the legitimate caller name. For example, “Who are you?” (Or “What are you doing?” Is uttered.

  On the other hand, when the caller calls himself “Ah, Yukie”, the same sequence as that after S204 in FIG. 2 is executed.

  FIG. 4 is a second sequence diagram in the present invention.

The sequence of FIG. 2 is a scenario in which the caller makes a call by impersonating another person who is not a close friend of the called party, for example, the “police”. In this case, the automatic telephone answering apparatus 1 cannot determine an illegal call using the voice print information of the legitimate caller.
[Scenario 2]
(System) “Hello”
(Partner) “This is from the police.”
(System) “What do you need?”
(Partner) “Actually, Yukie at home caused a traffic accident ...”

  The telephone automatic answering apparatus 1 further includes an illegal call keyword storage unit that stores an illegal call keyword in advance. In the illegal call keyword storage unit, keywords such as “police”, “accident”,... That are likely to be used in fraudulent telephone content are stored in advance.

(S401) After S201 to S203 in FIG. 2, the caller speaks. According to FIG. 4, for example, it is assumed that “this is for the police”. A caller who is a malicious third party calls himself a “police” and tries to fraudulently. The telephone automatic answering apparatus 1 acquires “this is the police's voice” uttered by the caller as voice data.

(S402) The telephone automatic answering apparatus 1 uses the voice recognition processing unit to extract text from the voice data. The text includes “Police”.

(S403) It is determined whether or not the text includes a legitimate caller name and whether or not the illegal call keyword stored in the illegal call keyword storage unit is included.

(S404) If the text does not include the legitimate caller name and includes the illegal call keyword “police”, the question is asked to the unspecified caller stored in the response message storage unit. Say the second response message. For example, “What is your business?” Is uttered to an unspecified caller.

(S405) In response to such a question, the caller utters, for example, “Actually, Mr. Yukie at home caused a traffic accident ...”. The telephone automatic answering apparatus 1 acquires the utterance from the caller side as voice data.

(S406) The telephone automatic answering apparatus 1 uses the voice recognition processing unit to extract text from the voice data.

(S407) The telephone automatic answering apparatus 1 determines whether or not an illegal call keyword is included in the text. Here, the text includes the illegal call keyword “accident”.

(S408) If the text contains an illegal call keyword, the telephone automatic answering apparatus 1 notifies the callee of the telephone that there is a possibility of an illegal call. Thereafter, the telephone automatic answering apparatus 1 connects or disconnects the call from the caller.

  FIG. 5 is a third sequence diagram in the present invention.

According to the sequence of FIG. 3, the scenario is a case where the voiceprint information of the caller and the voiceprint information of the legitimate caller do not match.
[Scenario 3]
(System) “Hello”
(The other party) “Oh, it ’s Yukie”
(System) "Ah, how are you? By the way, what was the name of the dog you just started?"
(The other party) "..."

(S501) It is assumed that after S201 to S207 in FIG.

  The second response message for each legitimate caller name is recorded in advance from the telephone 3. The second response message is a question that is different for each legitimate caller name, and is a question that only the legitimate caller can know. For example, if the legitimate caller name is “Yukie” of the family, “Oh, how are you?

  In addition, an answer keyword for the second answer message for each legitimate caller is also registered in the telephone automatic answering apparatus 1. For example, the name of the dog is “Taro”. The telephone automatic answering apparatus 1 records the answer keyword as text.

  Here, the automatic telephone answering apparatus 1 utters the second answer message for the legitimate caller when the text includes the legitimate caller name and the voiceprint collation does not match. For example, a question “Yuki, what is the name of the dog you just started, what is your name?” Is spoken to the family's legitimate caller name “Yukie”.

(S502) The caller is suddenly asked for the name of the dog. The caller makes an excuse for such a question, or speaks an unnamed name. The telephone automatic answering apparatus 1 acquires the utterance from the caller side as voice data.

(S503) The telephone automatic answering apparatus 1 uses the voice recognition processing unit to extract text from the voice data.

(S504) The telephone automatic answering apparatus 1 determines whether or not the text includes an answer keyword corresponding to the second answer message, for example, the dog name “Taro”. Here, the text does not include the dog name “Taro”.

(S505) If the answer keyword “Taro” is not included in the text, the telephone automatic answering apparatus 1 notifies the callee of the telephone that there is a possibility of an illegal call. Thereafter, the telephone automatic answering apparatus 1 connects or disconnects the call from the caller.

  FIG. 6 is a functional configuration diagram of the telephone automatic answering apparatus according to the present invention.

  According to FIG. 6, the telephone automatic answering apparatus 1 includes an address storage unit 101, an answering message storage unit 102, a voiceprint information storage unit 103, an illegal call keyword storage unit 104, and an answer keyword storage unit 105.

  The address storage unit 101 stores a valid caller name. It also stores a telephone number corresponding to the legitimate caller name.

  The answering message storage unit 102 stores a first answering message immediately after an incoming call and a second answering message for making a different question for each legitimate caller name and to an unspecified caller. Record in advance by voice.

  The voiceprint information storage unit 103 stores the voiceprint information of the legitimate caller. Voiceprint information is actually extracted from the voice uttered by the legitimate caller.

  The illegal call keyword storage unit 104 stores an illegal call keyword in advance. An illegal call keyword is a keyword that is highly likely to be used in fraudulent telephone content, such as “police”, “accident”,.

  The answer keyword storage unit 105 stores an answer keyword corresponding to the second response message for each legitimate caller.

  In addition, the automatic telephone answering apparatus 1 includes a first response message uttering unit 111, a speech recognition processing unit 112, a voiceprint matching unit 113, a first text determination unit 114, and a second response message uttering unit 121. The second text determination unit 122, the illegal call notification unit 131, and the call connection unit 132 are further included. These functional components are realized by executing a program that causes a computer installed in the telephone automatic answering apparatus to function.

  The first response message utterance unit 111 utters the first response message (for example, “if”) recorded in the response message storage unit to the caller side at the time of the incoming call.

  The speech recognition processing unit 112 refers to the dictionary and the language model, and extracts text from the caller's utterance. The likelihood is calculated by comparing the voice data of the recognized word with the voice data uttered by the caller. The recognized word with the highest likelihood is determined as the spoken word.

  The voiceprint collation unit 113, when the voice-recognized text includes a legitimate caller name, displays the voice of the caller and voiceprint information of the legitimate caller name stored in the voiceprint information storage unit 103. Collate. If they do not match, the fraudulent call notification unit 131 or the second reception message utterance unit 121 is notified of that fact.

  The first text determination unit 114 determines whether or not the content (text) uttered by the caller in response to the first response message includes the name of the legitimate caller stored in the address storage unit 101. judge. If the name of the legitimate caller is included, the voice print collation unit 113 is notified to that effect.

  The first text determination unit 114 further determines whether or not the text includes an illegal call keyword stored in the illegal call keyword storage unit 104. When the illegal call keyword is included in the text, the fact is notified to the second reception message utterance unit 121.

The second response message utterance unit 121 utters the following second response message.
[If the text does not contain the legitimate caller name]
A second response message for asking an unspecified caller, which is stored in the second response message storage unit, is uttered.
[If the text does not contain the name of a legitimate caller and contains an illegal call keyword]
A second response message for asking an unspecified caller, which is stored in the second response message storage unit, is uttered.

  The second text determination unit 122 has the answer keyword corresponding to the second answer message stored in the answer keyword storage unit 105 as the content (text) uttered by the caller in response to the second answer message. It is determined whether or not it is included. The second text determination unit 122 further determines whether or not the text includes an illegal call keyword stored in the illegal call keyword storage unit 104. When the answer keyword is not included and when the illegal call keyword is included, the fact is notified to the illegal call notification unit 131.

  The illegal call notification unit 131 notifies the callee of the telephone that there is a possibility of an illegal call.

  The call connection unit 132 connects or disconnects the call from the caller to the called telephone 3.

  As described above in detail, according to the false call determination method and telephone automatic answering apparatus of the present invention, the answering machine function and the callee side can be made by letting the caller naturally speak at least twice. An illegal call from a malicious third party can be determined using the address function. A caller who is a malicious third party does not feel that he is talking to an automated telephone answering device.

  According to the present invention, the function of the telephone automatic answering apparatus can be mounted in the mobile phone in order to determine whether the call is an illegal call by a simple sequence. Further, even if the automatic telephone answering device is arranged in the home network or the communication carrier equipment, the load on the network is small.

  In the various embodiments of the present invention described above, various changes, modifications, and omissions in the scope of the technical idea and the viewpoint of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

  The present invention can determine whether a fraudulent call such as a wire fraud using a telephone or an ole fraud is made before the user starts a call.

DESCRIPTION OF SYMBOLS 1 Telephone automatic answering apparatus 101 Address memory | storage part 102 Answer message memory | storage part 103 Voiceprint information memory | storage part 104 Unjust call keyword memory | storage part 105 Answer keyword memory | storage part 111 1st answering message utterance part 112 Voice recognition process part 113 Voiceprint collation part 114 1st Text determination unit 121 Second response message utterance unit 122 Second text determination unit 131 Unauthorized call notification unit 132 Call connection unit 2 Calling side telephone 3 Calling side telephone

Claims (10)

Unauthorized call by a malicious third party pretending to be a caller's close relative (legitimate caller) using an automatic telephone answering device that automatically answers the caller when a call is received A method for determining a call comprising:
Automatic telephone answering device
An address storage unit for storing the name of a legitimate caller;
An answering message storage unit that pre-records the first answering message immediately after the incoming call according to the voice of the called party;
A voiceprint information storage unit for storing voiceprint information of a legitimate caller,
The automatic telephone answering device is:
The first response message recorded in the response message storage unit is issued so that a malicious third party caller does not feel that he / she is talking to the telephone automatic response device when an incoming call is received. A first step of speaking to the caller;
A second step of extracting text from the caller's utterance by speech recognition processing;
A third step of determining whether the text includes the legitimate caller name stored in the address storage unit;
When the text includes the valid caller name, it is determined whether the caller's utterance matches the voiceprint information of the valid caller name stored in the voiceprint information storage unit. A fourth step to:
A fifth step of notifying the callee of the telephone that there is a possibility of an illegal call when the voice of the caller does not match the voiceprint information of the voiceprint information storage unit. An illegal call determination method as a feature. The reception message storage unit further stores a second reception message for asking a question to an unspecified caller;
For the fourth step, if the text does not contain the legitimate caller name,
2. The illegal call according to claim 1, wherein the second response message stored in the second response message storage unit for asking a question to an unspecified caller is uttered and the process proceeds to the second step. Judgment method. The telephone automatic answering apparatus further includes an illegal call keyword storage unit that stores an illegal call keyword in advance,
For the third step, it is further determined whether or not the text includes the illegal call keyword stored in the illegal call keyword storage unit,
For the fourth step,
The first sub-step is that the unspecified message stored in the second response message storage unit when the text does not include the legitimate caller name and the illegal call keyword. Say a second answer message that asks the caller a question,
The third sub-step further determines whether or not the text includes the illegal call keyword stored in the illegal call keyword storage unit,
3. The illegal call determination method according to claim 2, wherein if the illegal call keyword is included in the text, the telephone user is notified that there is a possibility of an illegal call. The response message storage unit further stores a second response message for asking a different question for each legitimate caller name,
For the fifth step, if the voice of the caller does not match the voiceprint information of the voiceprint information storage unit,
A first sub-step of uttering a second response message corresponding to the legitimate caller name stored in the response message storage unit;
A second sub-step of extracting text from the caller's utterance by the speech recognition processing unit;
A third sub-step for determining whether or not the text includes an answer keyword stored in the answer keyword storage unit and corresponding to the second response message;
4. A fourth sub-step for notifying the callee of the telephone that there is a possibility of an illegal call if the answer keyword is not included in the text. The illegal call determination method described.   5. The function of the telephone automatic answering apparatus is mounted in a mobile phone, or the telephone automatic answering apparatus is arranged in a home network or a communication carrier facility. The illegal call determination method according to any one of the above. A telephone that automatically responds to the caller when the telephone is called in order to determine a fraudulent call that a malicious third party calls while impersonating the caller's close relative (legitimate caller) In the automatic response device,
An address storage means for storing a legitimate caller name;
A response message storage means for pre-recording a first response message immediately after an incoming call according to the voice of the called party;
Voiceprint information storage means for storing voiceprint information of the legitimate caller name;
The first response message recorded in the response message storage unit is issued so that a malicious third party caller does not feel that he / she is talking to the telephone automatic response device when an incoming call is received. First response message utterance means for uttering to the caller side;
Speech recognition processing means for extracting text from the caller's utterance;
First text determination means for determining whether or not the text includes the legitimate caller name stored in the address storage unit;
When the text includes the valid caller name, voiceprint matching means for matching the voice of the caller and the voiceprint information of the valid caller name stored in the voiceprint information storage unit;
When the caller's utterance and the voiceprint information stored in the voiceprint information storage unit do not match, the caller has a wrong call notification means for notifying the callee of the telephone that there is a possibility of a wrong call. An automatic telephone answering machine. The response message storage means further stores a second response message for asking a question to an unspecified caller;
When the first text determination means determines that the text does not contain the legitimate caller name, the second text is stored in the second answering message storage unit and asks an unspecified caller. 7. The telephone automatic answering apparatus according to claim 6, further comprising a second answer message uttering means for uttering the answer message. And further includes an unauthorized call keyword storage means for storing an unauthorized call keyword in advance,
The first text determination means further determines whether or not the illegal call keyword stored in the illegal call keyword storage unit is included in the text,
The second response message utterance means, when the text does not include the legitimate caller name and the illegal call keyword, is stored in the second response message storage unit, Say a second answer message that asks the unspecified caller a question,
A second text determination unit for further determining whether or not the text includes the illegal call keyword stored in the illegal call keyword storage unit;
8. The unauthorized call notification means, when the unauthorized call keyword is included in the text, notifies the user of the telephone that there is a possibility of an unauthorized call. The telephone automatic answering device described. The response message storage means further stores a second response message for asking a different question for each legitimate caller name,
When the caller's utterance and the voiceprint information stored in the voiceprint information storage unit do not match, the second response message utterance means corresponds to the name of the valid caller stored in the response message storage unit. Say 2 response messages,
The second text determination means determines whether or not the text includes an answer keyword corresponding to the second response message stored in the answer keyword storage unit,
7. The unauthorized call determination unit, when the answer keyword is not included in the text, notifies the callee of the telephone that there is a possibility of an unauthorized call. Automatic telephone answering device.   The telephone automatic answering apparatus according to any one of claims 6 to 9, wherein the telephone automatic answering apparatus is mounted in a mobile phone, or disposed in a home network or a communication carrier facility.

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