JP3866728B2 - Button telephone device with voice mail transfer function - Google Patents

Description

  The present invention relates to a button telephone apparatus having an answering machine function for automatically recording a message from a caller and a transfer telephone function for transferring an outside line to a destination or a mobile phone when an incoming call is received while the user is away.

  An answering machine function (hereinafter referred to as an answering machine function) for automatically recording a message from a caller (hereinafter referred to as a business message) has been widely used as a function for dealing with an answering machine. In recent years, the caller number notification service in the public communication network has become widespread, so that when the caller number is identified and the caller number is registered in advance in the communication terminal device, the incoming call is received. There has been proposed a communication terminal device that realizes a transfer telephone function for transferring a call to a destination or a mobile phone (for example, see Patent Document 1).

On the other hand, in a key telephone apparatus having an answering machine function, when there is an incoming call from an outside line at the time of absence setting, the key telephone main apparatus automatically answers and sends a response message, and a slave unit connected to the main apparatus (for example, A response message and a message for automatic recording are sent from the speaker of the key telephone) (hereinafter referred to as an answering machine monitoring function). Depending on the contents of the message, the key telephone responds to the outside line, There has been proposed a button telephone device capable of stopping the answering machine function and making a call with a caller on the outside line (see, for example, Patent Document 2).
JP 11-46243 A JP 2001-339750 A

  In such a conventional “communication terminal device” and “button phone device”, the answering machine function and the transfer telephone function cannot be compatible. In the case of the above-mentioned transfer communication function in the “communication terminal device”, When the call is transferred to a mobile phone or the like and responds to the transferred incoming call, the call is made without understanding the caller's requirements. Further, the answering machine monitoring function of the “button telephone device” described above cannot be used on the go or on a mobile phone. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to implement an answering record monitoring function in a place where the user is away from the office or a mobile phone in a button telephone apparatus having an answering function and a transfer telephone function.

  In order to solve the above-mentioned problems, the present invention comprises a button telephone main apparatus accommodating a plurality of external lines and one or more extensions, and one or more button telephones connected to the extensions, and having a voice mail function. In the apparatus, the key telephone main unit activates the answering machine function when an outside line incoming call is detected when answering is set, and when the forwarding destination responds, a call control means for making a call using a vacant outside line to a previously registered forwarding destination A message control means for sending a message of the answering machine function to the forwarding destination, a specific operation detecting means for detecting a specific operation of the forwarding destination, and the caller and the forwarding destination when the specific operation detecting means detects the specific operation And a transfer control means for enabling a call by connecting the call path to.

According to the present invention, when the specific operation detecting means detects a specific operation, a call recording control means for recording a call content between the caller and the transfer destination is provided. In the present invention, the outgoing call control means detects a caller number when an incoming call is received from the outside line, and if the incoming call is received from a specific caller, the outgoing call control means uses a free external line to send to the previously registered transfer destination. I was able to do it.

Furthermore, the present invention comprises a key telephone main apparatus that accommodates a plurality of external lines and one or more extensions, and one or more key telephones connected to the extension, wherein the button telephone has an answering machine function. The main device operates an answering machine response function when an outside line incoming call is detected at the time of answering setting, and transmits a call control means for making a call using a vacant outside line to a transfer destination registered in advance, and when the transfer destination responds to the answering machine, the answering machine A message control means for sending a response message or a message for a telephone function; a specific operation detecting means for detecting a specific operation of the transfer destination after the sending of the response message or during the sending of the message; and the specific operation detecting means A transfer control means for connecting the call path between the caller of the incoming incoming call and the transfer destination when the specific operation is detected, and enabling a call; When serial specific operation detection means detects the specific operation, and to and a call recording control means for recording a telephone conversation between the transfer destination and the caller. Further, according to the present invention, the call control means detects a caller number when the external line is received, and if the call is an external line from a specific caller, a call is made using a free external line to the transfer destination registered in advance. I was able to do it.

  According to the present invention, when an incoming call is detected when an answering machine is set, the answering machine function is activated and a call is made to a transfer destination registered in advance using a vacant external line. When the transfer destination answers, the answering machine function is sent to the transfer destination. Message (response message and business message), and when the forwarding destination listens to the message or the like and determines that it is necessary to talk, if a specific operation is performed, the call between the caller and the forwarding destination By connecting the road and making a call possible, it is possible to use the answering machine monitoring function even from outside the office or from a mobile phone.

  Moreover, since the call content between the caller and the forwarding destination can be recorded by a specific operation, the call content can be confirmed later. Further, since the caller ID can be detected when an incoming call is received and only an incoming call from a specific caller can be transferred, an important caller can be immediately dealt with from the transfer destination.

  Hereinafter, embodiments of the present invention will be described. In the following embodiments, a button telephone main apparatus and a wired button telephone connected to the button telephone main apparatus will be described as examples of the button telephone apparatus. However, the present invention is not limited to this. For example, instead of a wired button telephone, it is possible to use a wireless button telephone that wirelessly connects the key telephone main device and the key telephone. In addition, the present invention may be implemented not only with a key telephone apparatus but also with a private branch exchange that accommodates the key telephone.

  FIG. 1 is a schematic configuration diagram of a key telephone main device 10 and a key telephone 20 constituting a key telephone device according to the present invention. FIG. 2 is a functional block diagram of the central control unit 11 and the storage unit 16 of the key telephone main device 10 according to the present invention. FIG. 3 is a process flowchart of the call control means F45 in the central control unit 11 of the key telephone main device 10 according to the present invention. FIG. 4 is a process flowchart of the message control means F46, the specific operation detection means F47, the transfer control means F48, and the call recording control means F49 in the central control unit 11 of the key telephone main device 10 according to the present invention. FIG. 5 is a schematic sequence diagram of the button telephone apparatus according to the present invention.

  First, an outline of the configuration of the key telephone main device 10 and the key telephone 20 constituting the key telephone device will be described with reference to FIG. The key telephone apparatus includes a key telephone main apparatus 10 that accommodates a plurality of external lines and one or more internal lines, and one or more key telephones 20-1 to 20-n connected to the key telephone main apparatus 10.

  The key telephone main device 10 includes at least a central control unit 11, a speech path switch 12, a plurality of external line circuits 13-1 to 13-n, an answering machine circuit 14, and one or more extension circuits 15-1 to 15-15. -N, storage unit 16, and PB signal receiving circuit 17 are configured.

  The central control unit 11 analyzes and determines input information (including information from the key telephone 20) from each circuit of the key telephone main device 10, performs input / output of information to the storage unit 16, and controls each circuit.

  The communication path switch 12 performs exchange processing (connection between the outside line and the outside line, connection between the outside line and the outside line, connection between the outside line and the answering machine circuit 14, etc.) in the key telephone main device 10.

  The external line circuits 13-1 to 13-n are interface circuits connected to the external line. The external line disclosed in the present invention includes a general public line, a line of an IP telephone company, a dedicated line, a private line, a wireless line such as a mobile phone (using a wireless / wired conversion adapter), and the like. .

  The answering machine circuit 14 sends a response message of the answering machine function (for example, I'm away now, please tell me your name and message if you get a message), and the sender of the outside line. A message recording circuit for automatically recording a response message and a message mixing circuit for sending a response message / message to a transfer destination. In addition, a call recording circuit for recording the call contents between the outside line and the transfer destination is also provided.

  The extension circuits 15-1 to 15-n are interface circuits for communicating voice data and control data with the key telephones 20-1 to 20-n.

  The storage unit 16 stores transfer destination registration information registered in advance and caller number registration information registered in advance, in addition to the function as a normal storage unit.

  The PB signal receiving circuit 17 receives a DTMF signal (PB signal) which is a specific operation from the transfer destination.

  The key telephone 20 includes at least a control unit 21, a data transmission / reception circuit 22, a voice processing unit 23, a handset 24, a speaker 25, a dial key 26, an outside line key 27, a function key 28, An LCD display 29 is included.

  The control unit 21 analyzes and determines input information from each circuit in the key telephone 20 and controls each circuit.

  The data transmission / reception circuit 22 is an interface circuit for communicating voice data and control data with the key telephone main device 10 via an extension.

  The voice processing unit 23 controls voice digital / analog conversion, analog / digital conversion, call path switching with the handset 24, the speaker 25, and the like in the key telephone 20 and volume.

  The handset 24 is a handset for performing transmission and reception during a general call.

  The speaker 25 is an audible sound sending means used for sending an incoming / outgoing ringtone, a loudspeaking reception by the speaker, and the like.

  The dial key 26 is a means for inputting a telephone number, and is also used as an input means for various settings.

  The outside line key 27 is a plurality of input means for selecting an outside line to be used from a plurality of outside lines.

  The function key 28 is a plurality of input means such as hold, loud reception, and transition to various settings that are generally used in a button telephone device. It is also used for answering settings and cancellation of answering settings, and is also used for playing / erasing message messages automatically recorded by the answering function and playing / erasing call recording contents.

  The LCD display 29 displays a telephone number, a call time, and the like. Further, at the time of the absence setting, for example, a visual display such as “Absence Record is being set” is performed.

  Next, the functional configuration of the central control unit 11 and the storage unit 16 of the key telephone main device 10 according to the present invention will be described with reference to FIG. In the key telephone main device 10, the central control unit 11 includes at least an outside line circuit control unit F40, a communication path control unit F41, an answering machine control unit F42, a PB signal reception control unit F43, a data transmission / reception unit F44, The call control means F45, the message control means F46, the specific operation detection means F47, the transfer control means F48, and the call recording control means F49 are included, and transfer destination registration information F50 registered in the storage unit 16 in advance. And caller number registration information F51 registered in advance is stored.

  The outside line circuit control means F40 controls outside line incoming / outgoing and detects an outside line incoming / outgoing (in the following description, the outside line that has arrived will be described as the outside line circuit 13-1 for convenience), the outside control circuit F45 is notified of the outside line incoming / outgoing call. . In addition, when caller ID information is included in the incoming call, the caller ID information is also notified to the call control means F45. In addition, when an external line transmission notification to the transfer destination is received from the transmission control means F45 (in the following description, an external line to be transmitted is described as an external circuit 13-n for convenience), an instruction to place the external line circuit 13-n into an outgoing state is given. It has a function to put out.

  Further, the external line circuit control means F40 has a function of issuing an instruction to place the external line circuit 13-1 in an incoming call response state upon receiving an incoming call response notification from the outgoing call control means F45.

  Further, the external line circuit control means F40 has a function of monitoring the external line circuit 13-n and notifying the message control means F46 of the transfer destination response when detecting that the other party (transfer destination) that has made the external line response has responded. Yes.

  When the communication path control means F41 receives a notification from the transmission control means F45, the communication path control means F41 has a function of issuing an instruction to connect the outside line circuit 13-1 (incoming side) and the answering machine circuit bidirectionally to the communication path switch 12. When the notification is received from the message control means F46, the external line circuit 13-n (transmission side) and the answering machine circuit 14 are unidirectionally (so that the voice passes from the answering machine circuit 14 to the external line circuit 13-n). An instruction to connect is given to the communication path switch 12, and further, the voice passes through the external line circuit 13-n (transmitting side) and the PB signal receiving circuit 17 in one direction (external line circuit 13-n → PB signal receiving circuit 17). ) To issue a connection instruction to the communication path switch 12. At this time, since the communication path switch 12 is connected so that the voice passes in the direction from the answering machine 14 to the external line circuit 13-n (transmission side), the external line circuit 13-n (transmission side) You can listen to messages and business messages.

  When the communication path control means F41 receives the notification from the transfer control means F48, the communication path opening instruction between the external line circuit 13-1 (incoming side) and the answering machine circuit 14 and the external line circuit 13-n (outgoing side). And a call path opening instruction between the answering circuit 14 and the outside line circuit 13-n (calling side) and the PB signal receiving circuit 17 are sent to the call path switch 12, and the outside line circuit 13-1 (calling side) ) And the external line circuit 13-n (transmitting side) have a function of issuing an instruction to the communication path switch 12 in a bidirectional manner.

  Further, when the communication path control means F41 receives a notification from the call recording control means F49, the communication path control means F41 is connected between the outside line circuit 13-1 (incoming side), the outside line circuit 13-n (outgoing side), and the answering machine circuit 14. It has a function of issuing a connection instruction to the communication path switch 12.

  The answering machine control means F42 controls the answering machine function, and when notified from the outgoing call control means F45, sends a response message of the answering machine function to the external circuit 13-1 (incoming side) via the communication path switch 12. When sending of the response message is completed, it has a function of issuing an operation instruction regarding a series of answering machine functions to the answering machine circuit 14, such as starting recording of a message message sent from the external circuit 13-1 (incoming side). ing.

  Also, the answering machine control unit F42 has a function of stopping the answering machine circuit 14 when notified from the transfer control unit F48. Further, when the answering machine control means F42 receives the notification from the call recording control means F49, the answering machine 14 records the call recording between the external line circuit 13-1 (incoming side) and the external line circuit 13-n (outgoing side). It has a function of issuing an operation instruction to be started to the answering machine circuit 14.

  The PB signal reception control means F43 functions to monitor the PB signal reception circuit 17 and notify the specific operation detection means F47 when it receives a PB signal sent from the external line circuit 13-n (transmission side) via the communication path switch 12. have.

  The data transmission / reception means F44 has a function of sending information to the key telephone 20 via the extension circuit 15 when receiving information to be sent to the key telephone 20 from each means. Although not shown, the types of information include incoming call display information of the external line circuit 13-1 (incoming side) notified from the external line circuit control unit F40, and external line circuit 13-n (outgoing transmission) notified from the transmission control unit F45. Side) in-use display information, in-operation display information of the answering machine circuit 14, and the like.

  When receiving a notification of an incoming call from the external circuit control means F40, the transmission control means F45 determines whether it is in the absence setting state (not shown), and when it is in the absence setting, the forwarding destination registration information in the storage unit 16 Referring to F50, it is determined whether transfer destination registration information F50 is stored. If transfer destination registration information F50 is stored, it is determined whether there is a vacant external circuit. As described above, for the sake of convenience, the external line circuit 13-n has a function of notifying the external line circuit control means F40 of the external line transmission including the transfer destination registration information (for example, the transfer destination telephone number) F50. Yes. Although not shown, if the transfer destination does not respond even if the transfer destination is called for a certain time (for example, about 30 seconds), a function for issuing a notification to stop calling the transfer destination, and a function for calling the transfer destination again, Or, it has a function of calling another transfer destination.

  The call control means F45 receives the notification of the incoming call from the external line circuit control means F40, determines that the answering setting is set, and if the caller ID information is included in the incoming call, It is determined whether or not the transfer function is set (not shown), and when the caller number transfer function is set, the caller number registration information F51 in the storage unit 16 is referred to and the caller number registration information is referred to. It is determined whether or not F51 is stored. When caller ID registration information F51 is stored, the caller number notified is collated, and when the caller ID registration information F51 matches, the transfer is performed. The process proceeds to the determination process for the pre-registration information F50.

  Further, the transmission circuit control means F45 has a function of notifying the external line circuit control means F40 of an incoming call response to the external line circuit 13-1. And it has the function to notify the operation of the answering machine function to the answering machine control means F42. Further, the transmission circuit control means F45 has a function of issuing a notification of connecting the external line circuit 13-1 (incoming side) and the answering machine circuit 14 to the speech path control means F41.

  The message control means F46 has a function of notifying the communication path control means F41 of the connection between the circuits when receiving a transfer destination response notification from the external line circuit control means F40.

  When the specific operation detection unit F47 receives a notification of PB signal reception from the PB signal reception control unit F43, the specific operation detection unit F47 analyzes the signal and determines whether the operation is a specific operation (for example, # dial signal). If it is a specific operation, it has a function of notifying the transfer control means F48 and the call recording control means F49 of the specific operation.

  Upon receiving the notification of the specific operation from the specific operation detecting unit F47, the transfer control unit F48 opens the communication path between the circuits, the external line circuit 13-1 (incoming side), and the external line circuit 13-n ( It has a function of notifying the communication path connection with the calling side) and a function of notifying the answering machine control means F42 of the answering machine function stop.

  When receiving the notification of the specific operation from the specific operation detecting unit F47, the call recording control unit F49 determines whether the call recording function is set (not shown), and when the call recording function is set, The communication path control means F41 has a function of notifying the three-party connection, and the absence recording control means F42 is notified of the start of call recording.

  The transfer destination registration information F50 in the storage unit 16 stores a transfer destination telephone number to which an incoming line is transferred when answering is set.

  The caller ID registration information F51 in the storage unit 16 stores a caller ID for determining whether or not to transfer an incoming line when answering is set. Note that a plurality of (for example, 100 locations) caller ID registration information is stored.

  Although not shown in the drawing, the storage unit 16 is set with whether or not it is in the absence setting state, whether or not the transfer function by the caller number is set, and the call recording function by the specific operation is set. Information on whether or not there is also stored.

  Next, the processing of the call control means F45 in the central control unit 11 of the key telephone main device 10 will be described with reference to FIG. FIG. 3 starts from the place where the outside line incoming call is notified from the outside line circuit control means F40.

  First, with reference to the absence setting state stored in the storage unit 16, it is determined whether the absence setting state is set (S60). If it is not in the absence setting state, an outside line incoming call process (known) of the corresponding outside line is performed (S61).

  If the absence setting state is set in step S60, the presence / absence of the transfer function based on the caller number stored in the storage unit 16 is referred to determine whether the transfer function based on the caller number is present (S62). If there is no transfer function based on the caller ID, the transfer destination registration information F50 in the storage unit 16 is referred to in step S64 to determine whether transfer destination registration information exists (S64).

  If there is a caller number transfer function in step S62, the caller number registration information F51 in the storage unit 16 is referred to determine whether the caller number matches the received caller number (S63). If the caller ID and the caller ID registration information F51 match, the process of step S64 described above is performed. If the caller ID and the caller ID registration information F51 do not match, the normal answering machine response process (known) is performed without shifting to the transfer operation (S66). When the caller ID is not included in the incoming call outside line, it is determined that the caller ID does not match the caller ID registration information F51, and step S63 is determined as No.

  If there is no transfer destination registration information in step S64 (No), normal answering machine response processing (known) is performed (S66).

  If there is transfer destination registration information in step S64 (Yes), it is determined whether there is a free outside line (S65). If there is no free outside line, normal answering machine response processing (known) is performed (S66).

  If there is a vacant outside line in step S65, transfer destination registration information (telephone number) is set, the outside line circuit control means F40 is notified of the call to the vacant outside line (S67), and the button is sent via the data transmission / reception means F44. The telephone is notified of the use of the unused outside line display information (S68), and normal answering machine response processing (known) is performed (S66).

  Next, processing of the message control means F46, the specific operation detection means F47, the transfer control means F48, and the call recording control means F49 in the central control unit 11 of the key telephone main device 10 will be described with reference to FIG. . In FIG. 4, the left side shows the message control means F46, which starts from the point where the transfer destination response is notified from the external line circuit control means F40.

  Further, the right side of FIG. 4 shows the specific operation detecting means F47, the transfer control means F48, and the call recording control means F49, which starts from the point when the PB signal reception is notified from the PB signal reception control means F43.

  First, when the message control means F46 receives the transfer destination response notification, the message control means F46 makes a one-way connection from the answering machine circuit 14 to the outgoing line circuit 13-n (S70), and from the outgoing line circuit 13-n to the PB signal receiving circuit 17. Is notified to the communication path control means F41.

  Next, the right side of FIG. 4 will be described. When receiving the notification of PB signal reception, the specific operation detecting unit F47 determines whether the specific operation (for example, # dial) is performed (S80). If it is not a specific operation (for example, canceling transfer), other processing is performed (S81).

  When a specific operation is detected in step S80, the transfer control means F48 opens the speech path between the incoming call answering external circuit 13-1 and the answering machine circuit (S82), and between the outgoing call outside circuit 13-n and the answering machine circuit 14. The communication path is opened (S83), the communication path is opened between the outgoing line circuit 13-n and the PB signal receiving circuit 17 (S84), and the communication path is connected between the outgoing line circuit 13-n and the incoming call response external circuit 13-1 (S85). ) To the communication path control means F41.

  Further, the answering machine control means F42 is notified of the answering machine function stop notification (S86) to the answering machine circuit 14 and the key telephone 20 is notified of the sending of the display stop during operation of the answering machine circuit 14 via the data transmitting / receiving means F44 ( S87).

  Next, the call recording control unit F49 refers to the call recording function setting stored in the storage unit 16, and determines whether or not the call recording function is set (S88). If the call recording function is not set, the process ends.

  If it is determined in step S88 that the call recording function is set, the call path connection (three-way connection) between the outgoing line circuit 13-n, the incoming call answering line circuit 13-1, and the answering machine circuit 14 is sent to the call path control means F41. Notification is made (S89).

Further, the voice recording function operation notification to the voice recording circuit 14 is sent to the voice recording control means F42 (S90), and the key telephone 20 is notified to the key telephone 20 via the data transmission / reception means F44 to send the display information during the voice recording operation (S91). ).

  A schematic sequence of the above-described processing according to the present invention will be described with reference to FIG. When the key telephone main device 10 detects an incoming call, it is determined whether the answering setting is set. If the answering setting is set, it is determined whether there is forwarding destination registration information (in FIG. 5, the explanation is simplified). For this reason, the determination of the presence or absence of the transfer function based on the caller ID and the determination of the match between the caller ID and the caller ID registration information are not shown in the figure). The call is sent to the destination (in FIG. 5, for the sake of simplification of explanation, the determination of the presence or absence of an empty line is not shown). A busy outside line indication is sent to the key telephone 20, the incoming line is answered, a busy outside line indication is sent to the key telephone 20, an answering machine function is activated, and the answering machine busy indication is displayed. To send. The answering machine function sends a response message to the external line that has made an incoming call response, and starts recording the message when the response message has been sent.

  On the other hand, when a call is received at the forwarding destination, a response operation is performed. The sequence differs depending on how far the answering function of the key telephone main device 10 has advanced, and the response operation is performed while the response message is being sent. A case where a response operation is performed while recording the message is expressed as “forwarding destination response (B)”. If it is “forwarding destination response (A)”, the response message sent to the incoming call response outside line is also sent to the transfer destination, and then the message message sent from the called destination outside line is recorded and transferred. Send it out first. In the case of “forwarding destination response (B)”, the business message sent from the destination outside line is recorded and also sent to the forwarding destination. The forwarding destination listens to the business message and performs a specific operation when it is necessary to respond. When the specific operation is detected by the key telephone main device 10, the answering machine function is stopped, and the outside line of the incoming call destination and the forwarding destination are put into a call state. . Further, it is determined whether or not the call recording function is set. If the call recording function is set, the call recording between the outside line of the incoming call destination and the transfer destination is performed.

FIG. 2 is a schematic configuration diagram of a key telephone main device 10 and a key telephone 20 according to the present invention. FIG. 3 is a functional block diagram of a central control unit 11 and a storage unit 16 according to the present invention. The flowchart of the transmission control means F45 in the central control part 11 of the key telephone main apparatus 10 which concerns on this invention. The flowchart of the message control means F46 in the central control part 11 of the key telephone main apparatus 10 which concerns on this invention, the specific operation detection means F47, the transfer control means F48, and the call recording control means F49. The schematic sequence diagram in the button telephone apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Button telephone main unit 11 Central control part 12 Communication path switch 13 External circuit 14 Answering machine 15 Extension circuit 16 Memory | storage part 17 PB signal receiving circuit 20 Button telephone 21 Control part 22 Data transmission / reception circuit 23 Voice processing part 24 Handset 25 Speaker 26 Dial key 27 External key 28 Function key 29 LCD display F40 External circuit control means F41 Call path control means F42 Answering machine control means F43 PB signal reception control means F44 Data transmission / reception means F45 Transmission control means F46 Message control means F47 Specific operation detection Means F48 Transfer control means F49 Call recording control means F50 Transfer destination registration information F51 Caller ID registration information

Claims (5)

  A key telephone apparatus comprising a key telephone main apparatus accommodating a plurality of external lines and one or more extensions and one or more key telephones connected to the extension, wherein the key telephone main apparatus has an answering setting. Occasionally, when an incoming call is detected, an answering machine is activated, a call control means for making a call to a previously registered transfer destination using a vacant outside line, and a message of the answering machine function is sent to the transfer destination when the transfer destination responds. A message control means, a specific operation detecting means for detecting a specific operation of the transfer destination, and a call can be made by connecting a call path between the caller of the incoming incoming call and the transfer destination when the specific operation detecting means detects the specific operation. And a transfer control means. 2. The key telephone apparatus according to claim 1, further comprising a call recording control means for recording a call content between the caller and the transfer destination when the specific operation detecting means detects a specific operation. .   3. The key telephone apparatus according to claim 1, wherein the call control means detects a caller number when the outside line is received, and if the call is an outside line from a specific caller, the transfer destination registered in advance. A key telephone device characterized in that it can make a call using a free outside line. A key telephone apparatus comprising a key telephone main apparatus accommodating a plurality of external lines and one or more extensions and one or more key telephones connected to the extension, wherein the key telephone main apparatus has an answering setting. When an incoming call is detected from time to time, an answering machine response function is activated and a call control means for making a call using a free outside line to a previously registered transfer destination, and when the transfer destination answers, a response message of the answering machine function to the transfer destination or A message control means for sending a business message, a specific operation detecting means for detecting a specific operation of the transfer destination after the completion of sending the response message or during sending of the business message, and when the specific operation detecting means detects the specific operation Transfer control means for enabling a call by connecting a call path between the caller of the incoming incoming call and the transfer destination, and the specific operation detecting means There Upon detection of a specific operation, key telephone system characterized in that it comprises a call recording control means for recording a telephone conversation between the transfer destination and the caller. 5. The key telephone apparatus according to claim 4, wherein the call control means detects a caller number when the external line is received, and if the call is an external line call from a specific caller, an outgoing external line is set at the transfer destination registered in advance. A key telephone device characterized in that it can be used to make a call.

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