JP2019186634A - Call transfer method, telephone system and telephone control device - Google Patents

Abstract

To enable, at call transfer, a transfer destination user to securely receive the information of an incoming call from a transfer source user.SOLUTION: According to the transfer operation at a telephone terminal A in response to incoming from a telephone network NW, a call control unit 15 of a telephone control device 10 sets the incoming call to a hold state, and also establishes extension speech communication between the telephone terminal A and a telephone terminal B, and after the extension speech communication is established, inhibits the disconnection of the extension speech communication by the telephone terminal A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an incoming call transfer technique for a transfer destination user to receive information related to an incoming call from a transfer source user during call transfer.

  In general, in a telephone system such as a business phone system or a PBX system used in an office of a company, in addition to an individual telephone number assigned to a specific person as a telephone number, a representative telephone number representing a group such as a company or department Is used. Normally, a representative incoming call to such a representative telephone number is transferred to the telephone terminal of the user desired by the caller using the telephone system.

  In the telephone system, as such a transfer function, the transfer source user firstly responds to incoming calls such as representative calls, and after confirming the transfer destination user desired by the caller by calling with the caller, the transfer operation is performed. To temporarily hold the incoming call, call the transfer destination phone terminal, talk to the transfer destination user and verbally tell that the call is being made, and in response to disconnection of the call between the transfer source user and the transfer destination user, It has a so-called verbal transfer function in which the incoming call is automatically released from hold and transferred to the transfer destination telephone terminal and the transfer destination user makes a call with the caller. In addition to this, a transfer function for transferring the call to the transfer destination telephone terminal by skipping the call with the transfer destination user by performing a transfer operation by the transfer source user and a telephone control device are registered in advance for the caller telephone number. There is also a function to automatically transfer the representative incoming call to the transfer destination telephone terminal.

When an incoming call is transferred, the transfer destination user wants to know information about who the call is from and who transferred the call, that is, information about the caller and the transfer source user. This is because it is necessary to determine whether or not it is necessary to respond to the incoming call that has been transferred, and to make psychological preparations for talking to the caller after the response.
Conventionally, when transferring an incoming call, an automatic transfer technique for displaying a caller telephone number and a transfer source telephone number on a transfer destination telephone terminal has been proposed (for example, see Patent Document 1). According to this automatic transfer technology, the transfer destination user can know information regarding the caller and transfer source user at the time of call transfer.

JP 2008-22268 A

  In such a conventional technique, although the caller telephone number and the transfer source telephone number are displayed on the transfer destination telephone terminal, in general, the displayed telephone number and the caller or the transfer source user may not be immediately connected. Many. You can also convert the phone number into a name or name using the phone book and display it. However, if the phone number to be displayed is not registered in the phone book or the caller phone number is not notified Can not respond.

  Therefore, from the viewpoint of transmitting information on the caller and the transfer source user to the transfer destination user, it can be said that the oral transfer function in which the transfer source user verbally notifies the transfer destination user is the most excellent. According to the oral transfer function, after the transfer source user answers and holds the incoming call, the caller calls the desired user, i.e., the transfer destination user, and when the transfer destination user responds to this, “B in Department A” However, Mr. C is a phone call. " Therefore, the transfer destination user can respond to the incoming call with peace of mind.

  However, in such an oral transfer function, necessary information may not be accurately transmitted from the transfer source user to the transfer destination user. For example, there is a case where the transfer source user does not tell the transfer destination user who is the caller or who is the caller, and disconnects the call only by saying "telephone". In such a case, since the incoming call is released on hold immediately after the call is disconnected and transferred to the transfer destination telephone terminal, the transfer destination user cannot receive the information regarding the caller or the transfer source user. I have to respond. For this reason, even when the verbal transfer function is used, there is a problem in that the transfer destination user cannot reliably receive information about the caller and the transfer source user from the transfer source user.

  The present invention has been made to solve such problems, and it is an object of the present invention to provide an incoming call transfer technique that enables a transfer destination user to reliably receive information related to an incoming call from the transfer source user at the time of incoming call transfer. .

  In order to achieve such an object, a call transfer method according to the present invention is a call transfer method used in a telephone system including at least first and second telephone terminals, and responds to an incoming call from the telephone network. A call establishment step for placing the incoming call on hold in response to a transfer operation at the first telephone terminal and establishing an extension call between the first telephone terminal and the second telephone terminal; A disconnection prohibiting step for prohibiting disconnection of the extension call by the first telephone terminal after the extension call is established.

  Also, in one configuration example of the incoming call transfer method according to the present invention, the disconnection prohibiting step may be performed after the establishment of the extension call, automatically or in response to a disconnection prohibiting operation by the second telephone terminal. The telephone terminal is prohibited from disconnecting the extension call.

  Also, in one configuration example of the call transfer method according to the present invention, the disconnection prohibiting step is performed by the first telephone terminal in response to a prohibition canceling operation by the second telephone terminal after the extension call is established. The extension prohibition of the extension call is canceled.

  Also, in one configuration example of the call transfer method according to the present invention, when the disconnection prohibiting step performs an on-hook operation at the first telephone terminal after the extension call is established, the first telephone terminal Is controlled to a speaker receiving state to maintain the extension call.

  Also, in one configuration example of the call transfer method according to the present invention, in response to disconnection of the extension call by the second telephone terminal, the call holding state is canceled and the call is transferred to the second telephone terminal. A call transfer step is further provided.

  A telephone system according to the present invention is a telephone system including at least a first telephone terminal and a second telephone terminal, and uses a call transfer method according to any one of claims 1 to 5 from a telephone network. The incoming call transfer from the first telephone terminal responding to the incoming call to the second telephone terminal is controlled.

  A telephone control apparatus according to the present invention is a telephone control apparatus that accommodates at least first and second telephone terminals and connects the first and second telephone terminals to a telephone network. In response to a transfer operation at the first telephone terminal in response to an incoming call from the network, the incoming call is put on hold and an extension call is made between the first telephone terminal and the second telephone terminal. A call control unit to be established, and the call control unit prohibits the disconnection of the extension call by the first telephone terminal after the extension call is established.

  According to the present invention, when the incoming call from the telephone network is verbally transferred from the transfer source telephone terminal to the transfer destination telephone terminal, the transfer source user can disconnect the extension call with the transfer destination telephone terminal at the transfer source telephone terminal. Even if the call is made, the extension call between the transfer source telephone terminal and the transfer destination telephone terminal is maintained. For this reason, the forwarding destination user can reconfirm the information regarding the caller and the forwarding source user to the forwarding source user, and as a result, the forwarding destination user receives an incoming call from the forwarding source user when the incoming call is forwarded. You can be sure to receive information about.

It is a block diagram which shows the structure of the telephone system concerning 1st Embodiment. It is a sequence diagram which shows the verbal transfer operation | movement (basic) concerning 1st Embodiment. It is a sequence diagram which shows the oral transfer operation | movement (cut | disconnection prohibition operation) concerning 1st Embodiment. It is a sequence diagram which shows the verbal transfer operation | movement (automatic cutting prohibition) concerning 1st Embodiment. It is a block diagram which shows the structure of the telephone system concerning 2nd Embodiment. It is a sequence diagram which shows the oral transmission operation | movement (basic) concerning 2nd Embodiment. It is a sequence diagram which shows the oral transfer operation | movement (disconnection prohibition operation) concerning 2nd Embodiment. It is a sequence diagram which shows the verbal transfer operation | movement (automatic cutting prohibition) concerning 2nd Embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a telephone system 1 according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the telephone system according to the first embodiment.

  The telephone system 1 is composed of a telephone system such as a business phone system or a PBX system, and accommodates a plurality of telephone terminals 20 via extension lines L2 and the telephone network NW via an external line L1. A telephone control device 10 is provided which is connected for exchange and realizes a voice call with a partner telephone device 30 connected to a telephone network NW. Hereinafter, of the telephone terminals 20, the transfer source telephone terminal (first telephone terminal) is referred to as telephone terminal A, and the transfer destination telephone terminal (second telephone terminal) is referred to as telephone terminal B.

The telephone network NW is an existing telephone network such as a next generation network (NGN), an integrated services digital network (ISDN), a public switched telephone network (PSTN), and a mobile phone network.
In the following, for ease of understanding, the case where the telephone system according to the present invention is composed of a telephone system such as a business phone system or a PBX system will be described as an example. However, the present invention is not limited to this. It may be a parent-child phone device comprising a machine. A case where the telephone system is a parent-child telephone device will be described in a second embodiment described later.

[Telephone control device]
Next, the configuration of the telephone control device 10 according to the present embodiment will be described in detail with reference to FIG.
As shown in FIG. 1, the telephone control device 10 includes a telephone control device such as a main device of a business phone system or a PBX device of a PBX system. The main functional units include a network I / F unit 11 and a terminal I / F unit. 12, a switch unit 13, a storage unit 14, and a call control unit 15. Among these functional units, the call control unit 15 is realized by cooperation of a CPU and a program (not shown) in the storage unit 14.

  The network I / F unit 11 has a function of exchanging call control messages (call control signals) and voice data (voice signals) with the telephone network NW via the external line L1, and a call between the telephone network NW. It has a function of exchanging control messages (call control signals), voice data (voice signals), and various data.

The terminal I / F unit 12 has a function of exchanging control messages and voice data with the telephone terminal 20 via the extension line L2.
The switch unit 13 has a function of exchanging and connecting the communication path of the network I / F unit 11 and the communication path of the terminal I / F unit 12 in accordance with an instruction from the call control unit 15.

  The storage unit 14 includes a storage device such as a semiconductor memory or a hard disk, and has a function of storing control data and programs used for various processes in the telephone control device 10.

  The call control unit 15 has a function of performing general call control for switching and connecting the telephone terminal 20 to the telephone network NW. Specifically, an incoming call function for calling the corresponding telephone terminal 20 in response to an incoming call from the telephone network NW, and a telephone call with the telephone terminal 20 by controlling the switch unit 13 in response to a response operation at the calling telephone terminal 20 There are a function for realizing a voice call by connecting a communication path with the network NW, a function for making a call to a designated destination for the telephone network NW in response to a call operation at the telephone terminal 20, and the like.

  In addition, the call control unit 15 puts the incoming call on hold in response to the transfer operation at the telephone terminal A that responds to the incoming call from the telephone network NW as an oral transfer function, and between the telephone terminal A and the telephone terminal B. A call establishment function for establishing an extension call between them, a disconnection prohibition function for prohibiting disconnection of an extension call by telephone terminal A automatically or in response to a disconnection prohibition operation by telephone terminal B after the establishment of an extension call, and a telephone An incoming call transfer function for terminating the extension call in response to the disconnection of the extension call by the terminal B, releasing the on-hold status and connecting to the telephone terminal B is provided.

  Further, the call control unit 15 has a function of canceling the prohibition of disconnection of the extension call by the telephone terminal A in response to the prohibition release operation by the telephone terminal B after the establishment of the extension call, and When the on-hook operation is performed on the telephone terminal A, the telephone terminal A is provided with a function of controlling the telephone terminal A to the speaker receiving state and maintaining the extension call.

[Telephone terminal]
Next, the telephone terminal 20 according to the present embodiment will be described with reference to FIG.
The telephone terminal 20 includes a terminal I / F unit 21, a voice processing unit 22, an operation input unit 23, a display unit 24, and a terminal control unit 25 as main functional units. Among these functional units, the terminal control unit 25 is realized by cooperation of a CPU and a program (not shown).

The terminal I / F unit 21 has a function of exchanging control messages and voice data with the telephone control device 10 via the extension line L2.
The voice processing unit 22 outputs a function of outputting various signal sounds such as a ringtone from a speaker in response to an instruction from the terminal control unit 25 and voice data received from the telephone control device 10 via the terminal I / F unit 21. A function of decoding and outputting the obtained audio signal from a speaker (not shown), an audio signal input from a microphone (not shown), and encoding the obtained audio data to the terminal I / F unit 21 Via the telephone control device 10 via the telephone control device 10.

The operation input unit 23 includes various operation keys and hook switches, and has a function of detecting a user operation and outputting it to the terminal control unit 25.
The display unit 24 is composed of a display element such as an LED or an LCD, and displays various information such as a telephone line usage state, a telephone terminal 20 operation state, and a call partner and a call time based on the control of the terminal control unit 25. It has a function to do.

  Based on the control message from the telephone control device 10 received via the terminal I / F unit 21, the terminal control unit 25 performs an external line call with the other telephone device 30 via the telephone network NW, or the telephone control device 10. A function for establishing an extension call with another telephone terminal 20 via the terminal, a function for notifying a user operation detected by the operation input unit 23 to the telephone control device 10 via the terminal I / F unit 21, and a terminal I Based on the control message from the telephone control device 10 received via the / F unit 21, the audio processing unit 22 and the display unit 24 are controlled to perform various visible and audible displays. .

[Operation of First Embodiment]
Next, the call transfer operation of the telephone system 1 according to the present invention will be described.
First, with reference to FIG. 2, a case will be described in which an incoming call is forwarded from the telephone terminal A to the telephone terminal B without applying the prohibition of disconnection of the extension call to the telephone terminal A as a basic oral transfer operation. FIG. 2 is a sequence diagram illustrating an oral transfer operation (basic) according to the first embodiment.

  When the telephone control device 10 receives an incoming message (representative incoming call) from the telephone network NW originating from the counterpart telephone device 30 at the network I / F unit 11 via the external line L1 (step S100), The control unit 15 transmits an incoming message to the telephone terminal A corresponding to the incoming call destination telephone number via the terminal I / F unit 12 and the extension line L2 (step S101).

  The terminal control unit 25 of the telephone terminal A controls the voice processing unit 22 and the display unit 24 according to the incoming message received from the telephone control device 10 received by the terminal I / F unit 21 and displays an incoming call on the outside line. Thereafter, when a response operation of the user is detected by the operation input unit 23 (step S102), the terminal control unit 25 returns a response message from the terminal I / F unit 21 to the telephone control device 10 (step S103).

  In response to the response message from the telephone terminal A, the call control unit 15 transmits the response message to the telephone network NW via the network I / F unit 11 and the external line L1 (step S104), and controls the switch unit 13. Thus, the external line call is established by connecting the communication path on the network I / F unit 11 side connected to the partner telephone apparatus 30 and the communication path on the terminal I / F unit 12 side connected to the telephone terminal A. (Step S105). As a result, a call is started between the caller of the other party telephone device 30 and the transfer source user of the telephone terminal A (step S106), and the transfer destination user desired by the caller is verbally notified to the transfer source user. It is done.

Thereafter, when the transfer source user performs a transfer operation specifying the transfer destination user's telephone terminal B desired by the caller at the telephone terminal A (step S110), the terminal control unit 25 of the telephone terminal A A transfer request message is transmitted to the telephone control device 10 (step S111).
In response to the transfer request message from the telephone terminal A, the call control unit 15 controls the switch unit 13 to temporarily hold the external line L1 of the partner telephone device 30 (step S112), and the telephone terminal designated as the transfer destination An extension call message is transmitted to B (step S113).

  The terminal control unit 25 of the telephone terminal B controls the voice processing unit 22 and the display unit 24 to display the extension incoming call in response to the extension call message from the telephone control device 10. Thereafter, when a response operation of the transfer destination user is detected by the operation input unit 23 (step S114), the terminal control unit 25 returns a response message from the terminal I / F unit 21 to the telephone control device 10 (step S115). ).

  The call control unit 15 controls the switch unit 13 in response to the response message from the telephone terminal B, and is connected to the communication path on the terminal I / F unit 12 side connected to the telephone terminal A and the telephone terminal B. The extension call is established by connecting the communication path on the terminal I / F unit 12 side (step S116). As a result, a call is started between the transfer source user of the telephone terminal A and the transfer destination user of the telephone terminal B, and it is confirmed from the transfer source user that a call is made from the caller of the other party telephone device 30. It is communicated verbally to the transfer destination user (step S117).

Thereafter, the terminal control unit 25 of the telephone terminal A transmits a disconnection message from the terminal I / F unit 21 to the telephone control device 10 when the operation input unit 23 detects the disconnection operation of the transfer source user (step S120). (Step S121).
In response to the disconnect message from the telephone terminal A, the call control unit 15 controls the switch unit 13 to disconnect the extension call between the telephone terminal A and the telephone terminal B (step S122).

  Thereafter, the call control unit 15 controls the switch unit 13 to release the hold of the external line L1 of the partner telephone device 30 (step S123), and the network I / F unit 11 side connected to the partner telephone device 30 An external line call is established by connecting the communication path and the communication path on the terminal I / F unit 12 side connected to the telephone terminal B (step S124). Thereby, a telephone call is started between the caller of the other party telephone device 30 and the transfer destination user of the telephone terminal B (step S125).

  Next, with reference to FIG. 3, a description will be given of a case in which extension call disconnection by the telephone terminal A is prohibited in response to a disconnection prohibition operation at the telephone terminal B in the oral transfer operation. FIG. 3 is a sequence diagram illustrating an oral transfer operation (disconnection prohibition operation) according to the first embodiment. In FIG. 3, the same processing operations as those in FIG. 2 are denoted by the same reference numerals as described above.

  In FIG. 2, when the information about the caller and the transfer source user is verbally communicated from the transfer source user to the transfer destination user by the extension call between the phone terminal A and the phone terminal B, The transfer destination user can answer the call with the caller with peace of mind.

However, if the forwarding user does not tell you exactly who the caller is or who he / she is, or if the forwarding user misses the information, the information about the caller and the forwarding user is good. Sometimes it can't be communicated.
In such a case, when the transfer destination user performs a disconnection prohibiting operation on the telephone terminal B during the extension call with the telephone terminal A, the extension call by the telephone terminal A is prohibited.

  In step S117, after a call is started between the transfer source user of the telephone terminal A and the transfer destination user of the telephone terminal B, information about the caller and the transfer source user cannot be received successfully from the transfer source user. When the transfer destination user performs a disconnection prohibiting operation at the telephone terminal B, the terminal control unit 25 of the telephone terminal B detects the disconnection prohibiting operation of the transfer destination user by the operation input unit 23 (step S130). A disconnection prohibition message is transmitted from the I / F unit 21 to the telephone control device 10 (step S131).

In response to the disconnection prohibition message from the telephone terminal B, the call control unit 15 of the telephone control apparatus 10 stores a disconnection prohibition mode that prohibits disconnection of an extension call with the telephone terminal B as an operation mode of the telephone terminal A. Is set to 14 (step S132).
For this reason, when a disconnect message is received from the telephone terminal A (step S121) in response to the disconnection operation by the transfer source user (step S120), the call control unit 15 calls the telephone terminal A set in the storage unit 14 Therefore, the disconnect message from the telephone terminal A is ignored, and the extension call between the telephone terminal A and the telephone terminal B is maintained (step S133).

Thereby, since the extension call between the telephone terminal A and the telephone terminal B is continued, the information regarding the caller and the transfer source user can be reconfirmed from the transfer destination user to the transfer source user.
In this manner, when a prohibition release message is received from the telephone terminal B (step S135) in response to a prohibition cancellation operation by the transfer destination user who reconfirmed the information regarding the caller and the transfer source user (step S134), The call control unit 15 sets the release of the disconnection prohibition mode in the storage unit 14 as the operation mode of the telephone terminal A (step S136).

  Thereafter, in response to a new disconnection operation by the transfer source user (step S137), when a disconnect message is received from the telephone terminal A (step S138), the call control unit 15 calls the telephone set in the storage unit 14 Since the disconnection prohibition mode is released as the operation mode of the terminal A, the switch unit 13 is controlled to disconnect the extension call between the telephone terminal A and the telephone terminal B (step S122).

  As a result, the call control unit 15 controls the switch unit 13 to release the hold of the external line L1 of the partner telephone device 30 (step S123), as in FIG. 2, and the network connected to the partner telephone device 30 An external line call is established by connecting the communication path on the I / F unit 11 side and the communication path on the terminal I / F unit 12 side connected to the telephone terminal B (step S124). Accordingly, a call is started between the caller of the other party telephone device 30 and the transfer destination user of the telephone terminal B (step S125), and the transfer destination user starts a call with the caller with peace of mind. be able to.

  When the extension call is maintained in step S133, the transfer source user of the telephone terminal A has been talking with the transfer destination user of the telephone terminal B by the handset, and the on-hook operation is performed as the disconnection operation in step S120. The call control unit 15 may maintain the extension call by switching the telephone terminal A to the speaker receiving state. As a result, even when an on-hook operation is performed on the telephone terminal A, the voice of the transfer destination user is output from the speaker of the telephone terminal A, so that the transfer destination user can easily perform the transfer source user. Can call out.

  If a disconnection operation is performed in step S120, the call control unit 15 transmits a disconnection invalid message to the telephone terminal A, and the disconnection operation is invalid and the extension call with the telephone terminal B is maintained. It may be notified to the transfer source user by an audible / visible display on the voice processing unit 22 or the display unit 24 of the telephone terminal A. Thereby, the extension call can be continued smoothly between the transfer source user and the transfer destination user.

  If the disconnection message is received from the telephone terminal A after setting the operation mode of the telephone terminal A to the disconnection prohibition mode in step S132 (step S121), the call control unit 15 holds the disconnection message. Also good. As a result, when the disconnection prohibit mode of the telephone terminal A is canceled in step S136, the disconnect message becomes valid from the telephone terminal A that has been put on hold, and the process proceeds to step S122 and immediately between the telephone terminal A and the telephone terminal B. It is possible to disconnect the extension telephone call and transfer the incoming call of the other party telephone device 30 to the telephone terminal B, thereby omitting the disconnecting operation in step S137.

  For the disconnection prohibiting operation and disconnection canceling operation at the telephone terminal B, a dedicated key for performing these operations may be assigned to an arbitrary operation key, or another operation key may be used. Alternatively, it may be determined that the disconnection prohibiting operation is performed when the operation key is pressed, and the disconnection canceling operation is determined when the operation key is released. Accordingly, the disconnection prohibiting operation and the disconnection canceling operation can be performed by an extremely simple operation, and the operation burden on the user can be reduced.

  Next, with reference to FIG. 4, a description will be given of a case where in the oral transfer operation, extension call disconnection by the telephone terminal A is automatically prohibited in accordance with the establishment of the extension call between the telephone terminal A and the telephone terminal B. . FIG. 4 is a sequence diagram illustrating an oral transfer operation (automatic disconnection prohibition) according to the first embodiment. In FIG. 4, processing operations equivalent to those in FIGS. 2 and 3 are denoted by the same reference numerals as described above.

  In step S117, after a call is started between the transfer source user of the telephone terminal A and the transfer destination user of the telephone terminal B, the call control unit 15 of the telephone control device 10 sets the operation mode of the telephone terminal A as the operation mode. Then, a disconnection prohibiting mode for prohibiting disconnection of the extension call with the telephone terminal B is automatically set in the storage unit 14 (step S132). As a result, the disconnection prohibiting operation of the transfer destination user in step S130 shown in FIG. 3 can be omitted, and the operation burden on the transfer destination user can be reduced.

  Further, even when the transfer source user disconnecting operation in step S120 is performed quickly, the telephone terminal A is set to the disconnection prohibiting mode, so that the extension call between the telephone terminal A and the telephone terminal B is maintained. Can do. Note that the call control unit 15 may cancel the disconnection prohibiting mode of the telephone terminal A in response to the disconnecting operation for the extension call with the telephone terminal A by the telephone terminal B.

  Therefore, thereafter, in response to a disconnection operation by the transfer source user (step S120), when a disconnect message is received from the telephone terminal A (step S121), the call control unit 15 calls the telephone set in the storage unit 14 Since the operation mode of the terminal A is set to the disconnection prohibition mode, the disconnection message from the telephone terminal A is ignored and the extension call between the telephone terminal A and the telephone terminal B is maintained (step S133).

Thereby, since the extension call between the telephone terminal A and the telephone terminal B is continued, the information regarding the caller and the transfer source user can be reconfirmed from the transfer destination user to the transfer source user.
In this manner, when a prohibition release message is received from the telephone terminal B (step S135) in response to a prohibition cancellation operation by the transfer destination user who reconfirmed the information regarding the caller and the transfer source user (step S134), The call control unit 15 sets the release of the disconnection prohibition mode in the storage unit 14 as the operation mode of the telephone terminal A (step S136).

  Thereafter, in response to a new disconnection operation by the transfer source user (step S137), when a disconnect message is received from the telephone terminal A (step S138), the call control unit 15 calls the telephone set in the storage unit 14 Since the disconnection prohibition mode is released as the operation mode of the terminal A, the switch unit 13 is controlled to disconnect the extension call between the telephone terminal A and the telephone terminal B (step S122).

  As a result, the call control unit 15 controls the switch unit 13 to release the hold of the external line L1 of the partner telephone device 30 (step S123), as in FIG. 2, and the network connected to the partner telephone device 30 An external line call is established by connecting the communication path on the I / F unit 11 side and the communication path on the terminal I / F unit 12 side connected to the telephone terminal B (step S124). Accordingly, a call is started between the caller of the other party telephone device 30 and the transfer destination user of the telephone terminal B (step S125), and the transfer destination user starts a call with the caller with peace of mind. be able to.

  3 and 4, an example in which the disconnection operation for the extension call between the telephone terminal A and the telephone terminal B is performed at the telephone terminal A has been described as an example. However, this disconnection operation may also be performed at the telephone terminal B. Similarly, after the extension call between the telephone terminal A and the telephone terminal B is disconnected, the external call between the partner telephone device 30 and the telephone terminal B is started.

[Effect of the first embodiment]
As described above, according to the present embodiment, the call control unit 15 of the telephone control device 10 places the incoming call on hold in response to the transfer operation at the telephone terminal A that responds to the incoming call from the telephone network NW. An extension call is established between the terminal A and the telephone terminal B, and after the extension call is established, disconnection of the extension call by the telephone terminal A is prohibited.

  Thus, when an incoming call from the telephone network NW is verbally transferred from the telephone terminal A to the telephone terminal B, even if the transfer source user performs an operation of disconnecting the extension call with the telephone terminal B at the telephone terminal A, the telephone terminal The extension call between A and the telephone terminal B is maintained. For this reason, the forwarding destination user can reconfirm the information regarding the caller and the forwarding source user to the forwarding source user, and as a result, the forwarding destination user receives an incoming call from the forwarding source user when the incoming call is forwarded. You can be sure to receive information about.

  Therefore, for example, when the transfer source user's story cannot be heard well, or when the transfer source user has not received all the messages, conventionally, according to the disconnection operation by the transfer source user, Because the forwarding user immediately enters a call state, the forwarding user had to start a call with the caller without knowing who the phone was from and what the request was. According to the embodiment, it is possible to easily confirm to the transfer source user who the transfer destination user is from and what kind of business it is.

  Also, even if you do not want to answer the call from the caller with the name, company name, or affiliation given to you by the forwarding user, the caller has traditionally responded to the disconnection operation by the forwarding user. However, according to the present embodiment, the forwarding destination user refuses to answer the call to the forwarding source user. Can do.

Further, in the present embodiment, after the extension call is established, the call control unit 15 prohibits the disconnection of the extension call with the telephone terminal B by the telephone terminal A automatically or in response to the disconnection prohibiting operation by the telephone terminal B. You may make it do.
Thus, when the extension call is automatically prohibited from being disconnected from the telephone terminal B by the telephone terminal A after the establishment of the extension call, the transfer destination user's disconnection prohibiting operation can be omitted, The operation burden on the previous user can be reduced. Even when the transfer source user disconnects quickly, the telephone terminal A is set in the disconnection prohibition mode, so that the extension call between the telephone terminal A and the telephone terminal B can be maintained.

  On the other hand, if the disconnection of the extension call with the telephone terminal B by the telephone terminal A is prohibited in accordance with the disconnection prohibiting operation by the telephone terminal B, only when necessary according to the judgment of the transfer destination user Thus, it is possible to set the prohibition of disconnection of the extension call by the telephone terminal A.

In the present embodiment, the call control unit 15 prohibits the disconnection of the extension call by the telephone terminal A in response to the prohibition release operation by the telephone terminal B after the extension call between the telephone terminal A and the telephone terminal B is established. You may make it cancel.
Thereby, when it is unnecessary according to the judgment of the transfer destination user, the prohibition of disconnection of the extension call by the telephone terminal A can be immediately canceled.

In the present embodiment, the call control unit 15 controls the telephone terminal A to be in a speaker receiving state when an on-hook operation is performed at the telephone terminal A after the extension call between the telephone terminal A and the telephone terminal B is established. Then, the extension call may be maintained.
As a result, even when an on-hook operation is performed on the telephone terminal A, the voice of the transfer destination user is output from the speaker of the telephone terminal A, so that the transfer destination user can easily perform the transfer source user. It is possible to call out.

[Second Embodiment]
Next, with reference to FIG. 5, a telephone system 5 according to a second embodiment of the present invention will be described. FIG. 5 is a block diagram illustrating a configuration of a telephone system according to the second embodiment.

  In the present embodiment, a case will be described in which the telephone system 5 includes a parent-child telephone device including a telephone control device 50 corresponding to a parent device and a telephone terminal 20 corresponding to a child device. Hereinafter, the transfer source telephone terminal (first telephone terminal) that is the telephone control device 50 (master unit) is referred to as telephone terminal A, and the transfer destination telephone terminal (second telephone terminal) that is the telephone terminal 20 (slave unit). ) Is called telephone terminal B.

  In the present embodiment, a case where there is one telephone terminal 20 will be described as an example. However, a plurality of telephone terminals 20 may be connected to the telephone control device 50. Further, the extension line L2 connecting the telephone control device 50 and the telephone terminal 20 may be a wired line or a wireless line (cordless). The telephone terminal 20 has the same configuration as described above, and a description thereof is omitted here.

[Telephone control device]
Next, the configuration of the telephone control device 50 according to the present embodiment will be described in detail with reference to FIG.
As shown in FIG. 5, the telephone control device 50 is composed of a parent device of a parent-child telephone device, and includes a network I / F unit 51, a terminal I / F unit 52, a voice processing unit 53, an operation input unit as main functional units. 54, a display unit 55, a storage unit 56, and a call control unit 57. Among these functional units, the call control unit 57 is realized by cooperation of a CPU and a program (not shown) in the storage unit 56.

The network I / F unit 51 has a function of exchanging call control messages (call control signals) and voice data (voice signals) with the telephone network NW via the external line L1, and a call between the telephone network NW. It has a function of exchanging control messages (call control signals), voice data (voice signals), and various data.
The terminal I / F unit 52 has a function of exchanging control messages and voice data with the telephone terminal 20 via the extension line L2.

  In response to an instruction from the call control unit 57, the voice processing unit 53 exchanges and connects the communication path of the network I / F unit 51 and the communication path of the terminal I / F unit 52. In response to an instruction, a function for outputting various signal sounds such as ringtones from a speaker, audio data received via the external line L1 or the internal line L2, and decoding the obtained audio signal to a speaker (not shown) And a function of encoding a voice signal input from a microphone (not shown) and transmitting the obtained voice data to the outside line L1 or the extension line L2.

The operation input unit 54 includes various operation keys and hook switches, and has a function of detecting a user operation and outputting it to the call control unit 57.
The display unit 55 is composed of a display element such as an LED or an LCD, and based on the control of the call control unit 57, the use state of the telephone line, the operation state of the own device and the telephone terminal 20, and various kinds of information such as the call partner and the call time. It has a function to display information.
The storage unit 56 includes a storage device such as a semiconductor memory or a hard disk, and has a function of storing control data and programs used for various processes in the telephone control device 50.

The call control unit 57 has a function of performing general call control for exchanging and connecting the own device and the telephone terminal 20 to the telephone network NW, similarly to the call control unit 15 described above. More specifically, the voice processing unit 53 is controlled according to an incoming call function for calling the own device or the telephone terminal 20 corresponding to an incoming call from the telephone network NW, or a response operation on the calling own device or the telephone terminal 20. A function for realizing a voice call by connecting a communication path between the own apparatus or the telephone terminal 20 and the telephone network NW, or a call to the designated destination for the telephone network NW according to a call operation at the own apparatus or the telephone terminal 20 There is a function to make outgoing calls.
Similarly to the terminal control unit 25 described above, the call control unit 57 has a function of performing various visible and audible displays by controlling the voice processing unit 53 and the display unit 55.

  Similarly to the call control unit 15, the call control unit 57 sets the incoming call on hold according to the transfer operation at the telephone terminal A that responds to the incoming call from the telephone network NW as an oral transfer function. A call establishment function for establishing an extension call between A and a telephone terminal B, and after the establishment of an extension call, the telephone terminal A is prohibited from disconnecting an extension call automatically or in response to a disconnection prohibiting operation by the telephone terminal B And a call forwarding function for terminating the extension call in response to the disconnection of the extension call by the telephone terminal B, releasing the on-hold status and connecting to the telephone terminal B.

  Further, the call control unit 57 has a function of canceling the prohibition of disconnection of the extension call by the telephone terminal A in response to the prohibition release operation by the telephone terminal B after the establishment of the extension call, When the on-hook operation is performed at the telephone terminal B, the telephone terminal B is controlled to be in a speaker reception state and has a function of maintaining an extension call.

[Operation of Second Embodiment]
Next, an incoming call transfer operation of the telephone system 5 according to the present invention will be described.
First, with reference to FIG. 6, a description will be given of a case where an incoming call is forwarded from the telephone terminal A to the telephone terminal B without applying the prohibition of disconnection of the extension call to the telephone terminal A as a basic oral transfer operation. FIG. 6 is a sequence diagram illustrating an oral transfer operation (basic) according to the second embodiment.

  When the telephone control device 50 receives an incoming message (representative incoming call) from the telephone network NW originating from the counterpart telephone device 30, the network I / F unit 51 receives the call via the external line L1 (step S200). The control unit 57 controls the voice processing unit 53 and the display unit 55 to display an outside line incoming call.

  Thereafter, when a response operation of the user is detected by the operation input unit 54 (step S201), the call control unit 57 transmits a response message to the telephone network NW via the network I / F unit 51 and the external line L1. (Step S202), the voice processing unit 53 is controlled to establish an external line call by connecting to the communication path on the network I / F unit 51 side connected to the other party telephone device 30 (Step S203). As a result, a call is started between the caller of the other party telephone device 30 and the transfer source user of the telephone terminal A (step S204), and the transfer destination user desired by the caller is verbally notified to the transfer source user. It is done.

  Thereafter, when the transfer source user performs a transfer operation designating the telephone terminal B of the transfer destination user desired by the caller at the telephone terminal A (step S210), the call control unit 57 performs the voice processing unit 53. Is controlled to temporarily hold the external line L1 of the partner telephone device 30 (step S211), and an extension call message is transmitted to the telephone terminal B designated as the transfer destination (step S212).

  The terminal control unit 25 of the telephone terminal B controls the voice processing unit 22 and the display unit 24 according to the extension call message from the telephone control device 50 to display the extension incoming call. Thereafter, when a response operation of the transfer destination user is detected by the operation input unit 23 (step S213), the terminal control unit 25 returns a response message from the terminal I / F unit 21 to the telephone control device 50 (step S214). ).

  In response to the response message from the telephone terminal B, the call control unit 57 establishes an extension call by connecting the voice processing unit 53 to the communication path on the terminal I / F unit 52 side connected to the telephone terminal B ( Step S215). As a result, a call is started between the transfer source user of the telephone terminal A and the transfer destination user of the telephone terminal B, and it is confirmed from the transfer source user that a call is made from the caller of the other party telephone device 30. It is communicated verbally to the transfer destination user (step S216).

  Thereafter, when the operation input unit 54 detects the disconnection operation of the transfer source user (step S220), the call control unit 57 controls the voice processing unit 53 to disconnect the extension call with the telephone terminal B (step S220). S221).

  Thereafter, the call control unit 57 controls the voice processing unit 53 to release the hold of the external line L1 of the partner telephone device 30 (step S222), and the network I / F unit 51 side connected to the partner telephone device 30 side Is connected to the communication path on the terminal I / F unit 52 side connected to the telephone terminal B to establish an external line call (step S223). As a result, a call is started between the caller of the partner telephone device 30 and the transfer destination user of the telephone terminal B (step S224).

  Next, with reference to FIG. 7, a description will be given of a case in which extension call disconnection by the telephone terminal A is prohibited in response to a disconnection prohibition operation at the telephone terminal B in the oral transfer operation. FIG. 7 is a sequence diagram illustrating an oral transfer operation (disconnection prohibition operation) according to the second embodiment. In FIG. 7, the same processing operations as those in FIG.

  In step S216, after a call is started between the transfer source user of the telephone terminal A and the transfer destination user of the telephone terminal B, information regarding the caller and the transfer source user cannot be received successfully from the transfer source user. When the transfer destination user performs the disconnection prohibiting operation at the telephone terminal B, the terminal control unit 25 of the telephone terminal B detects the disconnection prohibiting operation of the transfer destination user by the operation input unit 23 (step S230). A disconnection prohibition message is transmitted from the I / F unit 21 to the telephone control device 50 (step S231).

In response to a disconnection prohibition message from the telephone terminal B, the call control unit 57 of the telephone control device 50 stores a disconnection prohibiting mode for prohibiting disconnection of an extension call with the telephone terminal B as an operation mode of the telephone terminal A. 56 is set (step S232).
For this reason, even if a disconnection operation by the transfer source user is detected (step S220), the call control unit 57 confirms that the operation mode of the telephone terminal A set in the storage unit 56 is set to the disconnection prohibition mode. Therefore, the disconnection operation at the telephone terminal A is ignored, and the extension call between the telephone terminal A and the telephone terminal B is maintained (step S233).

Thereby, since the extension call between the telephone terminal A and the telephone terminal B is continued, the information regarding the caller and the transfer source user can be reconfirmed from the transfer destination user to the transfer source user.
In this manner, when a prohibition release message is received from the telephone terminal B (step S235), in response to the prohibition cancellation operation by the transfer destination user who reconfirmed the information regarding the caller and the transfer source user (step S235), The call control unit 57 sets the release of the disconnection prohibition mode in the storage unit 56 as the operation mode of the telephone terminal A (step S236).

  Thereafter, in response to a new disconnection operation by the transfer source user (step S237), the call control unit 57 has released the disconnection prohibition mode as the operation mode of the telephone terminal A set in the storage unit 56. Then, the voice processing unit 53 is controlled to disconnect the extension call between the telephone terminal A and the telephone terminal B (step S221).

  As a result, the call control unit 57 controls the voice processing unit 53 to release the hold of the external line L1 of the partner telephone device 30 (step S222) and is connected to the partner telephone device 30 in the same manner as in FIG. An external line call is established by connecting the communication path on the network I / F unit 51 side and the communication path on the terminal I / F unit 52 side connected to the telephone terminal B (step S223). As a result, a call is started between the caller of the partner telephone device 30 and the transfer destination user of the telephone terminal B (step S224).

  When the extension call is maintained in step S233, the transfer source user of the telephone terminal A has been talking with the transfer destination user of the telephone terminal B by the handset, and the on-hook operation is performed as the disconnection operation in step S220. The call control unit 57 may switch the telephone terminal A to the speaker reception state and maintain the extension call. As a result, even when an on-hook operation is performed on the telephone terminal A, the voice of the transfer destination user is output from the speaker of the telephone terminal A, so that the transfer destination user can easily perform the transfer source user. Can call out.

  When the disconnection operation is performed in step S220, the call control unit 57 transfers that the extension call with the telephone terminal B is maintained by audible / visual display on the voice processing unit 53 and the display unit 55. You may make it notify a former user. Thereby, the extension call can be continued smoothly between the transfer source user and the transfer destination user.

  Further, after the operation mode of the telephone terminal A is set to the disconnection prohibition mode in step S232, when the disconnection operation is detected in the telephone terminal A (step S220), the call control unit 57 holds the disconnection operation. May be. Thereby, when the disconnection prohibit mode of the telephone terminal A is canceled in step S236, the disconnection operation becomes effective from the telephone terminal A that has been put on hold, and the process proceeds to step S221 and immediately between the telephone terminal A and the telephone terminal B. It is possible to disconnect the extension telephone call and transfer the incoming call of the partner telephone device 30 to the telephone terminal B, thereby omitting the disconnecting operation in step S237.

  For the disconnection prohibiting operation and disconnection canceling operation at the telephone terminal B, a dedicated key for performing these operations may be assigned to an arbitrary operation key, or another operation key may be used. Alternatively, it may be determined that the disconnection prohibiting operation is performed when the operation key is pressed, and the disconnection canceling operation is determined when the operation key is released. Accordingly, the disconnection prohibiting operation and the disconnection canceling operation can be performed by an extremely simple operation, and the operation burden on the user can be reduced.

  Next, with reference to FIG. 8, a description will be given of a case where in the oral transfer operation, extension call disconnection by the telephone terminal A is automatically prohibited according to the establishment of the extension call between the telephone terminal A and the telephone terminal B. . FIG. 8 is a sequence diagram illustrating an oral transfer operation (automatic disconnection prohibition) according to the second embodiment. In FIG. 8, processing operations equivalent to those in FIGS. 6 and 7 are denoted by the same reference numerals as described above.

  In step S216, after a call is started between the transfer source user of the telephone terminal A and the transfer destination user of the telephone terminal B, the call control unit 57 of the telephone control device 50 sets the operation mode of the telephone terminal A as the operation mode. Then, a disconnection prohibiting mode for prohibiting disconnection of the extension call with the telephone terminal B is automatically set in the storage unit 56 (step S232). As a result, the disconnection prohibiting operation of the transfer destination user in step S230 shown in FIG. 7 can be omitted, and the operation burden on the transfer destination user can be reduced.

  Further, even when the transfer source user disconnecting operation in step S220 is performed quickly, the telephone terminal A is set in the disconnection prohibiting mode, so that the extension call between the telephone terminal A and the telephone terminal B is maintained. Can do. Note that the call control unit 57 may cancel the disconnection prohibit mode of the telephone terminal A in response to the disconnection operation for the extension call with the telephone terminal A by the telephone terminal B.

  Therefore, after this, even if a disconnection operation by the transfer source user is detected (step S220), the call control unit 57 sets the operation mode of the telephone terminal A set in the storage unit 56 to the disconnection prohibition mode. Therefore, the disconnection operation at the telephone terminal A is ignored, and the extension call between the telephone terminal A and the telephone terminal B is maintained (step S233).

Thereby, since the extension call between the telephone terminal A and the telephone terminal B is continued, the information regarding the caller and the transfer source user can be reconfirmed from the transfer destination user to the transfer source user.
In this manner, when a prohibition release message is received from the telephone terminal B (step S235), in response to the prohibition cancellation operation by the transfer destination user who reconfirmed the information regarding the caller and the transfer source user (step S235), The call control unit 57 sets the release of the disconnection prohibition mode in the storage unit 56 as the operation mode of the telephone terminal A (step S236).

  Thereafter, in response to a new disconnection operation by the transfer source user (step S237), the call control unit 57 has released the disconnection prohibition mode as the operation mode of the telephone terminal A set in the storage unit 56. Then, the voice processing unit 53 is controlled to disconnect the extension call between the telephone terminal A and the telephone terminal B (step S221).

  As a result, the call control unit 57 controls the voice processing unit 53 to release the hold of the external line L1 of the partner telephone device 30 (step S222) and is connected to the partner telephone device 30 in the same manner as in FIG. An external line call is established by connecting the communication path on the network I / F unit 51 side and the communication path on the terminal I / F unit 52 side connected to the telephone terminal B (step S223). As a result, a call is started between the caller of the partner telephone device 30 and the transfer destination user of the telephone terminal B (step S224).

  7 and 8, an example in which the disconnection operation for the extension call between the telephone terminal A and the telephone terminal B is performed at the telephone terminal A has been described as an example. However, this disconnection operation may also be performed at the telephone terminal B. Similarly, after the extension call between the telephone terminal A and the telephone terminal B is disconnected, the external call between the partner telephone device 30 and the telephone terminal B is started.

[Effect of the second embodiment]
As described above, the telephone system according to the present invention is not limited to a telephone system such as a business phone system or a PBX system. Even in a parent-child telephone device including a parent device and a child device, the first embodiment It can be applied in the same manner as the form.

  Thus, when an incoming call from the telephone network NW is verbally transferred from the telephone terminal A to the telephone terminal B, even if the transfer source user performs an operation of disconnecting the extension call with the telephone terminal B at the telephone terminal A, the telephone terminal The extension call between A and the telephone terminal B is maintained. For this reason, the forwarding destination user can reconfirm the information regarding the caller and the forwarding source user to the forwarding source user, and as a result, the forwarding destination user receives an incoming call from the forwarding source user when the incoming call is forwarded. You can be sure to receive information about.

  In the present embodiment, the case where the incoming call is verbally transferred from the telephone terminal A, which is the telephone control device 50 (master unit), to the telephone terminal B, which is the telephone terminal 20 (slave unit), is described as an example. The present invention is not limited to this, and the same applies to the case where the incoming call is verbally transferred from the telephone terminal B which is the telephone terminal 20 (slave unit) to the telephone terminal A which is the telephone control device 50 (master unit). Applicable.

[Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

  DESCRIPTION OF SYMBOLS 1 ... Telephone system, 10 ... Telephone control apparatus, 11 ... Network I / F part, 12 ... Terminal I / F part, 13 ... Switch part, 14 ... Memory | storage part, 15 ... Call control part, 20 ... Telephone terminal, 21 ... Terminal I / F unit, 22 ... voice processing unit, 23 ... operation input unit, 24 ... display unit, 25 ... terminal control unit, 30 ... partner telephone device, 5 ... telephone system, 50 ... telephone control device (master unit), DESCRIPTION OF SYMBOLS 51 ... Network I / F part, 52 ... Terminal I / F part, 53 ... Voice processing part, 54 ... Operation input part, 55 ... Display part, 56 ... Memory | storage part, 57 ... Call control part, L1 ... External line, L2 ... extension line, NW ... telephone network.

Claims (7)

A call transfer method used in a telephone system including at least first and second telephone terminals,
In response to a transfer operation at the first telephone terminal in response to an incoming call from the telephone network, the incoming call is put on hold and an extension call is made between the first telephone terminal and the second telephone terminal. A call establishment step to establish a
And a disconnection prohibiting step of prohibiting disconnection of the extension call by the first telephone terminal after the extension call is established. The call transfer method according to claim 1,
The disconnection prohibiting step prohibits disconnection of the extension call by the first telephone terminal automatically or in response to a disconnection prohibition operation by the second telephone terminal after the extension call is established. Call forwarding method to be used. The call transfer method according to claim 1 or 2, wherein
The disconnection prohibiting step cancels the prohibition of disconnection of the extension call by the first telephone terminal in response to a prohibition canceling operation by the second telephone terminal after the extension call is established. Method. The call transfer method according to any one of claims 1 to 3,
In the disconnection prohibiting step, when an on-hook operation is performed on the first telephone terminal after the extension call is established, the extension call is maintained by controlling the first telephone terminal to a speaker receiving state. Call transfer method characterized. The call transfer method according to any one of claims 1 to 4,
An incoming call transfer method, further comprising: an incoming call transfer step of canceling the on-hold status of the incoming call and connecting to the second telephone terminal in response to disconnection of the extension call by the second telephone terminal.   A telephone system comprising at least a first telephone terminal and a second telephone terminal, wherein the first telephone responds to an incoming call from the telephone network using the call transfer method according to any one of claims 1 to 5. A telephone system for controlling call transfer from a terminal to the second telephone terminal. A telephone control device for accommodating at least first and second telephone terminals and connecting the first and second telephone terminals to a telephone network,
In response to a transfer operation at the first telephone terminal in response to an incoming call from the telephone network, the incoming call is put on hold and an extension line is provided between the first telephone terminal and the second telephone terminal. A call control unit for establishing a call;
The telephone control device, wherein the call control unit prohibits the extension telephone call from being disconnected by the first telephone terminal after the extension telephone call is established.

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