Main device, program, and incoming call transfer method of main device

Abstract

To provide an incoming call transfer technique for transferring a main incoming call to an appropriate telephone unit through a simple operation.SOLUTION: A main device 1 extracts, for each of telephone units 2-1 to 2-3 accommodated, keywords from communication data of the telephone units 2-1 to 2-3, and registers the extracted keywords in association with the telephone units 2-1 to 2-3. When receiving a call to a main telephone number without designation of the telephone units 2-1 to 2-3 as a callee, the main unit automatically answers the call and outputs voice guidance, to a caller, for selecting a desired keyword through key operation from among registered keywords. When the caller selects a keyword, the main device puts the call automatically answered on hold and transfers the call to the telephone units 2-1 to 2-3 associated with the selected keyword.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a main device, and particularly to an incoming call transfer technology for the main device.

Background Art

[0002] Patent Document 1 discloses a telephone scenario transfer system that can capture a subscriber even when the subscriber is absent. This telephone scenario transfer system includes a telephone exchange that houses a plurality of telephones and a voice response device connected to the telephone exchange. When a call destined for a telephone with an absence setting arrives, the telephone exchange sends this call to the voice response device. The voice response device automatically answers the call, obtains the destination telephone number from the telephone exchange, and causes the telephone exchange to sequentially transfer the call to a plurality of transfer destinations according to the transfer scenario information associated with this telephone number.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the telephone scenario transfer system described in Patent Document 1, it is necessary to create in advance transfer scenario information for each telephone housed in the telephone exchange when the user is absent and register it in the voice response device, which is cumbersome. In addition, the telephone scenario transfer system described in Patent Document 1 does not consider at all representative incoming calls that do not involve specifying a telephone as the destination.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide an incoming call transfer technology capable of transferring a representative incoming call to an appropriate telephone with a simple operation.

Means for Solving the Problems

[0006] To solve the above problems, for each telephone accommodated, the main device of the present invention extracts keywords from the call data of the telephone and registers the extracted keywords by associating them with this telephone. Then, when a call arrives at a representative number without specifying a telephone as the destination (representative call), it automatically answers this call and sends voice guidance to the caller for selecting a desired keyword from the registered keywords by key operation. Then, if the caller selects a keyword, the automatically answered call is put on hold and transferred to the telephone associated with this selected keyword.

[0007] Here, the main device may record calls for each telephone accommodated, and when receiving a keyword acquisition instruction from the telephone during a call, extract as keywords the words of a predetermined part of speech (for example, nouns) included in the call data within a predetermined time before receiving this keyword acquisition instruction. And / or, record calls for each telephone accommodated, and after the call ends, extract as keywords the words of a predetermined part of speech (for example, nouns) that repeatedly appear in the call data.

[0008] For example, the present invention One aspect is a main device that accommodates a plurality of telephones, call recording means for recording calls for each of the telephones; keyword registration means for each of the telephones to extract keywords from the call data of the telephone recorded by the call recording means and register the extracted keywords by associating them with the telephone; automatic answering means for automatically answering a call when the call arrives at a representative number without specifying a telephone as the destination, and sending voice guidance for selecting a desired keyword from the keywords registered by the keyword registration means by key operation to the caller of the call; When a keyword selection instruction indicating the desired keyword selected by a key operation is received from the caller of the call automatically answered by the automatic answering means, a hold transfer means for holding the automatically answered call and transferring it to the telephone registered in the keyword registration means associated with the keyword selected by the key operation is provided. 、 The keyword registration means When receiving a keyword acquisition instruction from the telephone during a call, extracts, as keywords, words of a predetermined part of speech included in the call data of the telephone recorded by the call recording means within a predetermined time before the reception of the keyword acquisition instruction. Also, another aspect of the present invention is A main device that houses a plurality of telephones, Call recording means for recording calls for each of the telephones, Keyword registration means for each of the telephones that extracts keywords from the call data of the telephone recorded by the call recording means and registers the extracted keywords in association with the telephone, Automatic response means that, when a call arrives at a representative number without specifying the telephone as the destination, automatically answers the call and sends voice guidance for allowing a desired keyword to be selected by a key operation from among the keywords registered by the keyword registration means to the originator of the call, Retention transfer means that, when receiving a keyword selection instruction indicating the desired keyword selected by a key operation from the originator of the call automatically answered by the automatic response means, holds the automatically answered call and transfers it to the telephone registered in the keyword registration means in association with the keyword selected by the key operation, and includes The keyword registration means For each of the telephones, extracts, as keywords, words of a predetermined part of speech that appear a predetermined number of times or more in the call data of the telephone recorded by the call recording means 。

Advantages of the Invention

[0009] In the present invention, for each telephone accommodated, the main device extracts a keyword from the call data of the telephone and registers the extracted keyword in association with this telephone. Therefore, the user of the telephone does not need to create transfer scenario information in advance and register it in the main device. In addition, the main device automatically answers a representative incoming call, allows the caller to select a desired keyword from the registered keywords, and transfers the call to the telephone associated with the selected keyword. Therefore, according to the present invention, a representative incoming call can be transferred to an appropriate telephone with a simple operation.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

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Figure 7

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] FIG. 1 is a schematic configuration diagram of a telephone system according to the present embodiment.

[0013] As shown in the figure, the telephone system according to the present embodiment includes a main device 1 connected to an external telephone network 3 such as an IP (Internet Protocol) telephone network and a PSTN (Public Switched Telephone Network), and an internal telephone network 4 composed of a LAN (Local Area Network), an analog line, etc., and a plurality of telephones 2-1 to 2-3 (hereinafter also simply referred to as telephone 2) accommodated in the main device 1 via the internal telephone network 4.

[0014] The main device 1 cooperates with the telephone 2 to establish a communication path between the telephones 2 and between the telephone 2 and the external telephone network 3, and relays a call between the telephone 2 and the call partner via this communication path. In addition, a representative number defined in advance as a telephone number not accompanied by the designation of the telephone 2 as a call destination is assigned to the main device 1, and a call incoming to the representative number via the external telephone network 3 is transferred to an appropriate telephone 2.

[0015] FIG. 2 is a sequence diagram for explaining an operation example of keyword registration processing of the telephone system according to the present embodiment.

[0016] First, when the main device 1 establishes a call path between the telephone 2 and the external telephone network 3 (S100), it starts recording the call using this call path (S101).

[0017] During the call, when the user of the telephone 2 performs a keyword acquisition operation (for example, an operation of a predetermined function key) immediately when a keyword representing his / her own field of expertise appears in the call (S102). In response to this, the telephone 2 sends a keyword acquisition instruction to the main device 1 (S103).

[0018] When the main device 1 receives a keyword acquisition instruction from the telephone 2 during the call, it registers the reception time of the keyword acquisition instruction (S104).

[0019] After that, when the call termination process is performed between the telephone 2 and the external telephone network 3 (S105) and the call path between them is released (S106), the main device 1 ends the recording of the call using this call path and registers the call data (S107).

[0020] Then, the main device 1 checks whether it has received a keyword acquisition instruction from the telephone 2, which is the party to this call, during the call recording. Here, since the main device 1 has received a keyword acquisition instruction from the telephone 2, it extracts words of a predetermined part of speech (for example, nouns) from the call data within a predetermined time (for example, 10 seconds) before the reception time of the keyword acquisition instruction, and determines the extracted words as keywords (S108). If the main device 1 has not received a keyword acquisition instruction from the telephone 2, it extracts words of a predetermined part of speech (for example, nouns) that appear repeatedly a predetermined number of times (for example, 3 times) or more in the call data, and determines the extracted words as keywords.

[0021] Next, the main device 1 assigns a key (for example, a dial number) of a telephone to which a registered keyword is not assigned to the determined keyword. Then, the determined keyword and the key of the telephone assigned to this keyword are associated and registered with the telephone 2 which is the party of the call from which this keyword is extracted from the call data (S109).

[0022] FIG. 3 is a sequence diagram for explaining an operation example of representative incoming call processing of the telephone system according to the present embodiment.

[0023] When a call arrives at the main device 1 from the public switched telephone network 3 at a representative number without specifying the telephone 2 as the destination (S120), the main device 1 automatically answers it and establishes a call path with the caller (S121). Then, the main device 1 generates voice guidance for selecting a keyword related to the inquiry item from the registered keywords by operating a key (for example, a dial number) of a telephone to which a keyword related to the inquiry item is assigned, and sends this voice guidance to the caller via the call path (S122).

[0024] Next, when the user of the caller operates a key to which a keyword related to the inquiry item is assigned in accordance with the voice guidance, the telephone (not shown) of the caller sends a tone signal corresponding to the operated key to the call path. This tone signal is transmitted from the public switched telephone network 3 to the main device 1 as a keyword selection instruction (S123).

[0025] When the main device 1 receives a keyword selection instruction from the caller via the call path, it holds the automatically answered call (S124). Also, the telephone 2 associated with the keyword assigned to the key specified by the keyword selection instruction received from the caller is determined as the transfer destination (S125). Then, the main device 1 transfers the held call to the telephone 2 determined as the transfer destination (S126), and if the telephone 2 of the transfer destination responds (S127), a call path is established between the telephone 2 of the transfer destination and the caller of the held call (S128).

[0026] Next, the details of the main device 1 that constitutes the telephone system according to the present embodiment will be described.

[0027] Note that since the telephone 2 can use an existing button telephone equipped with a display unit such as an LCD (Liquid Crystal Display), a detailed description thereof will be omitted.

[0028] FIG. 4 is a schematic functional configuration diagram of the main device 1.

[0029] As shown in the figure, the main device 1 includes an internal telephone network interface unit 10, an external telephone network interface unit 11, a call control unit 12, a relay unit 13, a call recording unit 14, a keyword acquisition instruction reception time storage unit 15, a keyword extraction unit 16, a keyword registration unit 17, and a voice guidance generation unit 18.

[0030] The internal telephone network interface unit 10 is an interface for connecting to the internal telephone network 4, and the external telephone network interface unit 11 is an interface for connecting to the external telephone network 3.

[0031] The call control unit 12 establishes a call path between the telephone 2 and a call partner (another telephone 2 or the external telephone network 3) by performing call control processing in cooperation with the telephone 2. The call control unit 12 also includes an automatic answering unit 120 and a hold transfer unit 121.

[0032] When a call arrives at a representative number without specifying the telephone 2 as the call destination, the automatic answering unit 120 automatically answers this call and sends the voice guidance generated by the voice guidance generation unit 18 to the call source.

[0033] When the hold transfer unit 121 receives a keyword selection instruction from the call source via the call path established by the automatic answering unit 120 automatically answering a call arriving at the representative number, it holds this call and transfers it to the telephone 2 associated with the keyword specified by this keyword selection instruction and registered in the keyword registration unit 17.

[0034] The relay unit 13 relays a call between the telephone 2 and the call partner (another telephone 2 or the external line telephone network 3) via the call path established by the call control unit 12.

[0035] The call recording unit 14 records calls for each telephone 2 together with the time.

[0036] When the keyword acquisition instruction reception time storage unit 15 receives a keyword acquisition instruction from the telephone 2 during a call, it registers the reception time in association with the telephone 2 that is the transmission source of the keyword acquisition instruction.

[0037] The keyword extraction unit 16 extracts, for each telephone 2, a keyword representing the user's specialized field from the call data recorded by the call recording unit 14.

[0038] The keyword registration unit 17 assigns a key (for example, a dial number) of a telephone to which a registered keyword has not been assigned to the keyword extracted by the keyword extraction unit 16, and associates and registers this keyword and the key of the telephone to which this keyword has been assigned with the telephone 2 that is the party to the call from which this keyword has been extracted from the call data.

[0039] FIG. 5 is a diagram schematically showing an example of the registration content of the keyword registration unit 17.

[0040] As shown in the figure, a record 140 is registered for each keyword in the table held by the keyword registration unit 17. The record 140 has a field 141 in which the keyword is registered, a field 142 in which a list of information of the telephone 2 associated with this keyword is registered, and a field 143 in which the key assigned to this keyword is registered.

[0041] The voice guidance generation unit 18 refers to the keyword registration unit 17 and generates voice guidance for selecting a keyword related to the inquiry item from the keywords registered in the keyword registration unit 17 by operating a key to which a keyword related to the inquiry item is assigned.

[0042] Note that the functional configuration of the main device 1 shown in FIG. 4 may be realized hard by an integrated logic IC such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array), or may be realized software by a computer such as a DSP (Digital Signal Processor). Alternatively, in a general-purpose computer such as a PC equipped with a CPU, a memory, an auxiliary storage device such as a hard disk and a flash memory, and a communication interface such as a NIC (Network Interface Card), the CPU may load a predetermined program from the auxiliary storage device onto the memory and execute it to be realized as a process.

[0043] FIG. 6 is a flowchart for explaining the keyword registration process of the main device 1.

[0044] This flow is started when the call control unit 12 establishes a call path between the telephone 2 and the external telephone network 3.

[0045] First, the call control unit 12 notifies the established call path to the call recording unit 14 and instructs the start of recording. In response to this, the call recording unit 14 records the call via the notified call path, associates it with the telephone 2 connected to this call path, and stores the recorded call data together with the time (S200).

[0046] Then, when the call control unit 12 receives a keyword acquisition instruction from the telephone 2 connected to this call path during the call path establishment (during the call) (YES in S201), it associates the reception time of this keyword acquisition instruction with this telephone 12 and stores it in the keyword acquisition instruction reception time storage unit 15 (S202).

[0047] Also, when the call control unit 12 performs the call termination process between the telephone 2 during call path establishment and the outside line telephone network 3 (YES in S203), it releases this call path and notifies the call recording unit 14 of the released call path to instruct the end of recording. In response to this, the call recording unit 14 ends the recording of the call via the notified call path (S204).

[0048] Next, the call control unit 12 notifies the keyword extraction unit 16 to extract keywords with the telephone 2 connected to the released call path as the processing target telephone 2. In response to this, the keyword extraction unit 16 acquires the latest call data stored together with the time associated with the processing target telephone 2 from the call recording unit 14, and determines whether a keyword acquisition instruction was received from the processing target telephone 2 during the recording (during the call) of this call data, that is, whether the reception time of the keyword acquisition instruction is associated with the processing target telephone 2 and stored in the keyword acquisition instruction reception time storage unit 15 (S205).

[0049] Here, when a keyword acquisition instruction is received during the recording of call data from the target telephone 2 (when the reception time of the keyword acquisition instruction is associated with the target telephone 2 and stored in the keyword acquisition instruction reception time storage unit 15) (YES in S205), the keyword extraction unit 16 extracts partial call data, which is the call data within a predetermined time (for example, within 10 seconds) before the reception time of the keyword acquisition instruction, from this call data. Then, voice recognition processing is performed on the extracted partial call data, and morphological analysis is performed on the recognition result to extract words of a predetermined part of speech (for example, nouns) from this partial call data (S206). On the other hand, when a keyword acquisition instruction is not received during the recording of call data from the target telephone 2 (when the reception time of the keyword acquisition instruction is not associated with the target telephone 2 and not stored in the keyword acquisition instruction reception time storage unit 15) (NO in S205), the keyword extraction unit 16 performs voice recognition processing on this call data, and morphological analysis is performed on the recognition result to extract words of a predetermined part of speech (for example, nouns) that appear repeatedly a predetermined number of times (for example, 3 times) or more from this call data (S207).

[0050] After that, the keyword extraction unit 16 determines the words extracted from the call data as keywords, and notifies the keyword registration unit 17 of these keywords together with the telephone set 2 to be processed (S208). In response to this, the keyword registration unit 17 registers the telephone set 2 to be processed by associating it with this keyword as the destination telephone set 2 (S209). Specifically, the keyword registration unit 17 refers to the record 140 stored in the table it holds, and determines whether the keyword notified from the keyword extraction unit 16 is registered in the field 141 of any record 140. If it is already registered, the telephone set 2 notified together with this keyword from the keyword extraction unit 16 is additionally registered in the field 142 of the record 140 in which this keyword is registered. On the other hand, if it is not registered, a key (for example, a dial number) of a telephone that is not registered in the field 143 of any record 140 is assigned to the keyword notified from the keyword extraction unit 16, and a new record 140 is added. The keyword notified from the keyword extraction unit 16, the telephone set 2, and the key assigned to this keyword are registered in the fields 141 to 143 of this record 140.

[0051] FIG. 7 is a flowchart for explaining the representative incoming call processing of the main device 1.

[0052] This flow starts when a call arrives from the external telephone network 3 at a representative number without specifying the telephone set 2 as the destination.

[0053] First, the automatic response unit 120 automatically answers the call incoming to the representative number (S220). Also, the voice guidance generation unit 18 generates voice guidance for selecting, from among the registered keywords, a keyword related to the inquiry item by operating the key (e.g., dial number) of the telephone to which a keyword related to the inquiry item is assigned, based on the keyword (field 141) and the assigned key (field 143) of each record 140 registered in the keyword registration unit 17. Here, a key of the telephone for selecting an unregistered keyword may be determined in advance, and an explanation of the key operation for selecting the unregistered keyword may be included in the voice guidance. Then, the automatic response unit 120 sends out the voice guidance generated by the voice guidance generation unit 18 to the call originator via the call path established by the automatic response (S221), and waits for a keyword selection instruction to be sent from the call originator (S222).

[0054] Thereafter, if the automatic response unit 120 receives a keyword selection instruction from the call originator (YES in S222), it notifies the hold transfer unit 121 of this keyword selection instruction. In response to this, the hold transfer unit 121 holds the call whose call path has been established by the automatic response unit 120 (S223), and determines the transfer destination of the held call based on the keyword selected at the call originator (S224). Specifically, it refers to the record 140 registered in the keyword registration unit 17, and identifies the record 140 in which the key specified by the keyword selection instruction is registered in the field 143. Then, it determines the telephone 2 (all of them if there are multiple telephones 2) registered in the field 142 of the identified record 140 as the transfer destination. If the key specified by the keyword selection instruction is a key for selecting an unregistered keyword, it determines all the telephones 2 or the telephone 2 predetermined as the general window as the transfer destination.

[0055] Next, the hold transfer unit 121 transfers the held call to the transfer destination (S225). If a response is received from the transfer destination (YES in S226), the call hold is released, and a communication path is established between the call originator and the transfer destination that responded (S227).

[0056] The above describes one embodiment of the present invention.

[0057] In this embodiment, for each telephone 2 accommodated, the main device 1 extracts keywords from the call data of the telephone 2 and registers the extracted keywords in association with this telephone 2. Therefore, the user of the telephone 2 does not need to create transfer scenario information in advance and register it in the main device 1. Further, when the main device 1 receives an incoming call to a representative number without specifying the telephone 2 as the call originator (representative incoming call), it automatically answers this, causes the call originator to select a desired keyword from the registered keywords, and transfers the call to the telephone 2 associated with the selected keyword. Therefore, according to this embodiment, the representative incoming call can be transferred to an appropriate telephone 2 with a simple operation.

[0058] Also, in this embodiment, when the main device 1 receives a keyword acquisition instruction from the telephone 2 during a call recording, it extracts words of a predetermined part of speech included in the call data within a predetermined time before the reception of this keyword acquisition instruction, and determines this as the keyword. Therefore, the user of the telephone 2 can register a keyword indicating the field that the user can handle, etc. in the main device 1 by a simple operation during the call, improving convenience.

[0059] Also, in this embodiment, even when the main device 1 does not receive a keyword acquisition instruction from the telephone 2 during a call recording, it extracts words of a predetermined part of speech that repeatedly appear in the call data and determines this as the keyword. Therefore, the user of the telephone 2 can register a keyword in the main device 1 without performing a special operation during the call by repeatedly uttering a keyword indicating the field that the user can handle, etc., further improving convenience.

[0060] Note that the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist thereof.

[0061] For example, in the above-described embodiment, when the telephone number of the caller of the representative incoming call is registered in advance in the main device 1 as the telephone number of the telephone 2 accommodated in the main device 1 via the external telephone network 3 by a VPN (Virtual Private Network), or as the telephone number of a telephone integrated with a computer such as CTI (Computer Telephony Integration), the main device 1 may automatically answer and send voice guidance to the caller, and at the same time, send guidance display data (display data for allowing the user to select a desired keyword by key operation from among the registered keywords) having the same content as this voice guidance to the telephone of the caller or the computer associated with this telephone. When the external telephone network 3 is other than an IP network, an IP network interface for sending guidance display data to the representative incoming call caller or the computer associated with this caller is provided in the main device 1. Here, when sending guidance display data to the computer associated with the representative incoming call caller, a keyword selection instruction may be received from the computer via the IP network interface.

Explanation of Signs

[0062] 1: Main device 2, 2-1 to 2-3: Telephones 3: External telephone network 4: Internal telephone network 10: Internal telephone network interface unit 11: External telephone network interface unit 12: Call control unit 13: Relay unit 14: Call recording unit 15: Keyword acquisition instruction reception time storage unit 16: Keyword extraction unit 17: Keyword registration unit 18: Voice guidance generation unit 120: Automatic answering unit 121: Hold transfer unit

Claims

1. A main device for accommodating a plurality of telephones, call recording means for recording calls for each of the telephones; keyword registration means for each of the telephones to extract keywords from the call data of the telephone recorded by the call recording means and register the extracted keywords in association with the telephone; automatic answering means for automatically answering a call when a call arrives at a representative number without specifying the telephone as the calling party, and sending voice guidance for allowing a desired keyword to be selected by key operation from among the keywords registered by the keyword registration means to the calling party of the call; hold transfer means for holding the automatically answered call when a keyword selection instruction indicating the desired keyword selected by key operation is received from the calling party of the call automatically answered by the automatic answering means, and transferring the call to the telephone registered by the keyword registration means in association with the keyword selected by the key operation; The keyword registration means, when receiving a keyword acquisition instruction from the telephone during a call, extracts words of a predetermined part of speech included in the call data of the telephone recorded by the call recording means within a predetermined time before receiving the keyword acquisition instruction as keywords The main device is characterized by the above.

2. A main device for accommodating a plurality of telephones, call recording means for recording calls for each of the telephones; keyword registration means for each of the telephones to extract keywords from the call data of the telephone recorded by the call recording means and register the extracted keywords in association with the telephone; automatic answering means for automatically answering a call when a call arrives at a representative number without specifying the telephone as the calling party, and sending voice guidance for allowing a desired keyword to be selected by key operation from among the keywords registered by the keyword registration means to the calling party of the call; When a keyword selection instruction indicating the desired keyword selected by a key operation is received from the caller of the call automatically answered by the automatic answering means, the automatically answered call is put on hold and transferred to the telephone set registered in the keyword registration means and associated with the keyword selected by the key operation, and a hold transfer means; The keyword registration means For each telephone set, extracts, as keywords, words of a predetermined part of speech that appear a predetermined number of times or more in the call data of the telephone set recorded by the call recording means The main device is characterized by this.

3. The main device according to claim 1 or 2, When the caller of the call automatically answered by the automatic answering means is a pre-registered telephone number, guidance display data for allowing a desired keyword to be selected by a key operation from among the keywords registered by the keyword registration means is transmitted to the caller or the terminal associated with the caller Guidance display data transmission means The main device is characterized by this.

4. A program that causes a computer to function as a main device that houses a plurality of telephone sets, Call recording means for recording calls for each telephone set, For each telephone set, keyword registration means for extracting keywords from the call data of the telephone set recorded by the call recording means and registering the extracted keywords in association with the telephone set, When a call arrives at a representative number without specifying the telephone set as the destination, the call is automatically answered, and voice guidance for allowing a desired keyword to be selected by a key operation from among the keywords registered by the keyword registration means is sent to the caller of the call. Automatic answering means, and When a keyword selection instruction indicating the desired keyword selected by a key operation is received from the caller of the call automatically answered by the automatic answering means, the computer functions as a hold and transfer means for holding the automatically answered call and transferring it to the telephone set registered in the keyword registration means and associated with the keyword selected by the key operation. The keyword registration means When a keyword acquisition instruction is received from the telephone set during a call, words of a predetermined part of speech included in the call data of the telephone set recorded by the call recording means within a predetermined time before the reception of the keyword acquisition instruction are extracted as keywords. A program characterized by the above.

5. A program for causing a computer to function as a main device accommodating a plurality of telephone sets, Call recording means for recording calls for each telephone set, Keyword registration means for each telephone set, which extracts keywords from the call data of the telephone set recorded by the call recording means and registers the extracted keywords in association with the telephone set, When a call arrives at a representative number without specifying the telephone set as the destination, the call is automatically answered, and voice guidance for allowing a desired keyword to be selected by a key operation from among the keywords registered by the keyword registration means is sent to the caller of the call. Automatic answering means, and When a keyword selection instruction indicating the desired keyword selected by a key operation is received from the caller of the call automatically answered by the automatic answering means, the computer functions as a hold and transfer means for holding the automatically answered call and transferring it to the telephone set registered in the keyword registration means and associated with the keyword selected by the key operation. The keyword registration means For each telephone set, words of a predetermined part of speech that appear a predetermined number of times or more in the call data of the telephone set recorded by the call recording means are extracted as keywords. A program characterized by the above.

6. A method for incoming call transfer of a main device that houses a plurality of telephones, wherein the main device for each of the telephones, records a call, and when a keyword acquisition instruction is received from the telephone during the call, extracts, as keywords, words of a predetermined part of speech included in the call data of the telephone recorded within a predetermined time before the reception of the keyword acquisition instruction, associates the extracted keywords with the telephone, and registers them, when a call arrives at a representative number without specifying the telephone as the destination, automatically answers the call and sends voice guidance for allowing selection of a desired keyword from the registered keywords by a key operation to the caller of the call, when a keyword selection instruction indicating the desired keyword selected by a key operation is received from the caller of the automatically answered call, holds the automatically answered call and transfers it to the telephone associated with the keyword selected by the key operation A method for incoming call transfer of a main device, characterized by the above.

7. A method for incoming call transfer of a main device that houses a plurality of telephones, wherein the main device for each of the telephones, records a call, and extracts, as keywords, words of a predetermined part of speech that appear a predetermined number of times or more in the recorded call data of the telephone, associates the extracted keywords with the telephone, and registers them, when a call arrives at a representative number without specifying the telephone as the destination, automatically answers the call and sends voice guidance for allowing selection of a desired keyword from the registered keywords by a key operation to the caller of the call, when a keyword selection instruction indicating the desired keyword selected by a key operation is received from the caller of the automatically answered call, holds the automatically answered call and transfers it to the telephone associated with the keyword selected by the key operation A method for incoming call transfer of a main device, characterized by the above.

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