JPH10164191A - Telephone terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a telephone terminal that informs immediately the arrival of a incoming call from a 3rd party during a speech when the speech is finished and makes a callback to the opposite party as required. SOLUTION: When an incoming call from a 3rd party comes during a speech and the telephone number of the 3rd party is informed from an exchange 2, its telephone number is stored in a memory 102 and when the terminal is idle, an alarm lamp 113 is lighted immediately to inform the presence of the incoming call during the speech. The telephone number stored in a memory 102 is displayed on a display device 103 through the depression of a display button 108 and dialing is automatically made to the displayed telephone number by the depression of a dial button as required or the displayed telephone number is deleted from the memory 102 through the depression of an end button 1112. Furthermore, the processing is once finished by the depression of an end button 112 and a callback is made to the opposite party or the telephone number of the opposite party is deleted at an optional time by the depression of the display button 108.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone terminal, and more particularly, to an incoming call from a third party during a call, displaying the number of the called party after the call and, if necessary, receiving the call. The present invention relates to a telephone terminal having a busy incoming call notification function for calling back to the other party.

[0002]

2. Description of the Related Art In a telephone provided with a call back function, when an incoming call is received from a third party during a call, the telephone number of the caller of the call is stored. Japanese Patent Application Laid-Open No. S59-154865 discloses a technique for calling back a called party of an incoming call.

A technique disclosed in Japanese Patent Laid-Open Publication No. Sho 59-154865 is an automatic private branch exchange containing a multifunctional telephone having number display means for displaying a destination subscriber number. When a called party encounters a busy or no answer when calling a multi-function telephone and abandons the call in midstream, joining the extension telephone calling a storage area created in the main storage device The subscriber number information is stored, and the contents of the storage area are displayed on the number display means in accordance with the operation of the multi-function telephone subscriber who is the called subscriber who was on the call. The extension telephone is automatically called back.

[0004] The technique disclosed in Japanese Patent Application Laid-Open No. 5-308668 relates to an electronic key telephone apparatus having an ISDN interface and accommodating a key telephone having a display. This electronic key telephone apparatus has a calling number memory for storing, for each key telephone, a calling number which is a telephone number of a caller in a call setting information sent from a network side when an incoming call is received on an ISDN line. Means for writing the calling number in the calling number memory while the called key telephone is talking, and reading out the information written in the calling number memory when the calling is terminated and monitoring whether the key telephone is busy. Means, means for displaying the read information on the display, and picking up the ISDN line by lifting the handset of the key telephone which is performing the display, and the calling number stored in the calling number memory for the ISDN network. Means for setting and transmitting the call setting information. When the call cannot be received because the called key telephone is busy, etc., only one telephone number of the caller is stored,
Thereafter, the state of the key telephone is monitored at regular intervals.
When the key telephone that has been in a call becomes idle, the stored telephone number of the caller is displayed on the display of the key telephone. In this state, the subscriber of the key telephone simply goes off-hook, and the caller is automatically called back using the displayed telephone number of the other party.

[0005]

According to these conventional techniques, when an incoming call from a third party is received by a terminal that is in a call, the caller's telephone number is stored. There is a problem that, when the terminal becomes empty, it is not always possible to immediately know that there is an incoming call during a call. This is disclosed in JP-A-59-154865.
In the technology disclosed in Japanese Patent Laid-Open Publication No. H11-107, the presence of a caller who has received an incoming call during a call can be known by an operation of pressing a display button on a terminal in a state where the call has been completed, and an operation of pressing the display button at the end of the call Without it, it means that the presence of an incoming call during a call cannot be known. The technique disclosed in Japanese Patent Application Laid-Open No. 5-308668 is a means for storing the telephone number of a caller who has received an incoming call during a call and monitoring the state of a key telephone in order to display the caller number. However, the key telephone is not provided with an electronic key telephone device that accommodates the telephone, and the status of the key telephone is monitored at regular intervals, so that even if the key telephone becomes idle, There is a problem that the caller ID of the incoming call is not always displayed immediately.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to enable a subscriber to immediately notify that a call has been received from a third party during a call when the subscriber has finished the call and becomes free. Another object of the present invention is to provide a telephone terminal that can call back a third party by a simple operation.

Further, as an application example, there is provided a telephone terminal capable of storing a caller number of a call which was received while absent, was abandoned without answering, and can be called back later.

In order to achieve this object, the present invention provides a line interface in which a call channel and a signal channel are separated, and a caller ID of a call encountered during a call of a called terminal is transmitted to the called terminal. A telephone terminal accommodated in an exchange for transferring to said terminal via said signal channel, said exchange comprising means for receiving a caller ID of an incoming call during a call transferred via said signal channel during a call; Line interface means for performing the interface of the above, memory means for storing the caller number of the received call-in-progress call, and monitoring the circuit interface means, and when the caller number of the call-in-call call is received from the exchange, the caller concerned The number is transferred to the memory means, and when the telephone terminal becomes idle, the stored information in the memory means is confirmed and the caller number of the incoming call during a call to the memory means is received. Characterized by comprising a processing control unit for performing alarm display when being accumulated.

Further, the telephone terminal further comprises an operation input means and a display means, and the processing control means, when a display button of the operation input means is pressed, displays a caller number of the incoming call during a call stored in the memory means. The information is displayed on the display means.

Further, the processing control means transfers the caller number of the incoming call during call displayed on the display means to the line interface means when the call button of the operation input means is depressed, and makes a call based on the caller number. It is characterized by transmitting.

Further, the telephone terminal further includes timer means, and the processing control means sets the counting time of the timer means by pressing a dial button of the operation input means, and thereafter, a transmission button of the operation input means Is pressed, a call based on the caller ID of the incoming call during call displayed on the display means is transmitted after counting the counting time set in the timer means.

A telephone terminal accommodated in an exchange for notifying a called terminal of a call arriving at the called terminal to the called terminal, wherein the telephone terminal receives the calling number of the incoming call transferred from the exchange. Line interface means for interfacing with the exchange, display means for displaying a caller number of the received incoming call, and the telephone set which monitors the line interface means and does not respond to an incoming call from the exchange. When the terminal is idle, the system further comprises processing control means for storing the caller number of the received incoming call in the memory means and further displaying an alarm.

Further, the telephone terminal further comprises operation input means, and the processing control means displays the caller number of the incoming call stored in the memory means on the display means when the display button of the operation input means is pressed. Further, when the call button of the operation input means is pressed, the caller number of the incoming call displayed on the display means is transferred to the line interface means, and a call based on the caller number is transmitted.

Further, the present invention provides a line interface in which a speech channel and a signaling channel are separated, and when an incoming call is encountered while the called terminal is busy, the caller ID of the call is transmitted to the called terminal. A telephone terminal comprising memory means and display means accommodated in an exchange for transferring the caller number of the call to the called terminal via the signal channel before the call when the called terminal is free if the called terminal is idle Monitoring the line interface means, transferring the caller number to the memory means when receiving the caller number from the exchange when the telephone terminal is busy, and storing the caller number in the memory means when the telephone terminal becomes idle. When the caller ID of an incoming call during a call is stored in the memory means and an alarm is displayed, a call is received from the exchange to the telephone terminal. Receiving the caller number and transferring the caller number to the display means, and when the telephone terminal becomes idle without answering the incoming call, the caller number of the received call is stored in the memory means. And processing control means for displaying an alarm.

Further, the telephone terminal further comprises operation input means, and the processing control means displays the caller number of the incoming call stored in the memory means on the display means when the display button of the operation input means is pressed. Further, when the call button of the operation input means is pressed, the caller number of the incoming call displayed on the display means is transferred to the line interface means, and a call based on the caller number is transmitted.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

In FIG. 1, a portion denoted by reference numeral 1 is a telephone terminal according to the present invention, which has a function of notifying a telephone number of a caller who attempted to receive a call while busy and a function of calling back the corresponding party. It is a key telephone. The key telephone 1 is housed in an exchange 2 having a function of notifying a terminal of a caller number in response to an incoming call.

For example, a private branch exchange accommodating a multifunctional telephone provided with a communication channel and a signal channel separated, and an IS accommodating an ISDN interface terminal also provided with a communication channel and a signal channel separated.
A DN subscriber exchange and the like correspond to the exchange 2 in FIG. As a matter of course, in the exchange 2, when a call is received at the subscriber terminal to which the service is provided, the caller ID of the call is processed as described later as a process when a callee is encountered during the call. Depending on the caller class, a function is provided to transfer to the called terminal using a signal channel separated from the call channel.

The key telephone 1 has a CPU 101, a memory 102 for storing a caller's telephone number, a display control device 105 and a display 103 for displaying the stored telephone number, and a normal telephone calling / receiving function. 2, a line interface 104 connecting the exchange 2 and the key telephone 1, an input control unit 106 for receiving input from each button, and a dial button 107 (0 to 9). ,
*, #), A display button 108 for requesting the display of a caller's telephone number, a scroll button 109 for displaying one by one when there are a plurality of caller numbers, and a caller displayed on the display 103. A call button 110 for calling a telephone number, a delete button 111 for deleting an unnecessary caller telephone number among caller telephone numbers stored in the memory 102, and an end button 112 for ending the operation And an alarm lamp 113 for indicating that there is a caller telephone number.

Next, the operation of the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a flowchart showing an operation mainly performed by the exchange 2 when an incoming call is received from a third party while the key telephone 1 is talking. When there is an incoming call on the key telephone 1 (step 201), the exchange 2 determines whether the key telephone 1 is busy or idle (step 202). Perform (step 203) and end the process. Key telephone 1
Is busy, the exchange 2 plays a busy tone to the caller (step 204) and urges the caller to disconnect the call. At this time, the exchange 2 notifies the telephone terminal of the caller telephone number via the line interface 104. The caller telephone number notified from the exchange 2 received by the signal receiving unit (not shown) of the line interface 104 is analyzed by the CPU 101 of the key telephone 1, and the time at that time is given as an incoming time and stored in the memory 102 (step 205). ). (This (caller ID + incoming time)
Is hereinafter referred to as data. In addition, at this time, the exchange 2 also notifies the class information of the caller, and the caller's telephone number is not to be called back (for example, a public telephone).
If it is possible to identify that the number is, the data for such a number is not created and stored in the memory 102.

FIG. 3 shows the contents of data stored in the memory 102. This data is stored in order from the top of the memory 102 each time there is an incoming call from a third party while the key telephone 1 is in a call, and the number of cases can be stored according to the memory capacity.
(Hereinafter, this collection of data will be referred to as a telephone number storage list.) If the data exceeds the maximum number of storages, the incoming time in the data in the telephone number storage list is searched, and the oldest data is deleted. To store the new data.

FIG. 4 shows that when the key telephone 1 has finished a call and goes on-hook (that is, becomes idle), it informs the caller telephone number of the incoming call that was on the call and calls back the other party. It is a flowchart of the operation at the time.

First, when the key telephone 1 finishes talking and goes on-hook (step 401), the CPU 101 monitoring the state of the line interface 104 knows that the key telephone 1 has become empty. At this time, CPU1
01 determines whether a telephone number storage list has been created in the memory 102 (step 402). If not, it is determined that there was no incoming call from a third party during a call, and the process ends. . If there is a telephone number storage list in the memory 102, the CPU 101 turns on the alarm lamp 113 via the display control device 105,
During a call, a third party is notified that there is an incoming call (step 403).

If the alarm lamp 113 is turned on for a certain period of time and the user does not perform any operation (for example, pressing various buttons) on the key telephone 1,
Or the end button 112 while the alarm lamp 113 is on.
If is pressed (step 404), the alarm lamp 113 is turned off (step 405), and the process ends.

When the user presses the display button while the alarm lamp 113 is on (step 406), the alarm lamp 113 is turned off (step 407) and the CPU 1
01 displays data of the telephone number storage list on the memory 102 on the display 103 via the display control device 105 (step 408).

The data displayed on the display 103 is one at a time. If there are a plurality of data in the telephone number storage list, each time the scroll button 109 is pressed, the data is displayed in order from the top of the telephone number storage list. You.

Here, the user operates the display 103
It is determined whether or not the data displayed in (1) is the person to be called back now (step 409). If the data is to be called back, the call button 110 is pressed (step 41).
0). When the transmission button 110 is pressed, the transmission telephone number in the data is transferred to a transmission control circuit (not shown), and transmission is performed to the exchange 2 via the line interface 104 (step 411). When this call is made, the memory 1
02 is deleted from the telephone number storage list on the telephone number 02 (step 412).

After calling and talking, if the key telephone 1 is on-hook again after ending the call, the operation from step 401 (when the on-hook is completed after the call,
The CPU 101 determines whether a telephone number storage list has been created on the memory. ) Will be repeated.

When there is no other party to call back in the telephone number storage list, the user can delete unnecessary data.

In FIG. 4, it is determined whether the data displayed on the display 103 is data to be deleted (step 413). If the data is data to be deleted, the delete button 111 is pressed there (step 41).
4) and the corresponding data is deleted from the telephone number storage list in the memory 102 under the control of the CPU 101 via the input control device 106 (step 415).

If there are a plurality of data to be deleted, the operations of steps 413 to 415 (displaying the data to be deleted in the telephone number storage list by using the scroll buttons and pressing the delete button) may be repeated.

If the data displayed on the display 103 is data that the user does not want to recall now but does not want to delete, the processing is once completed and the data on the telephone number storage list is stored. be able to. In this case, if the end button 112 is pressed (step 416) while the telephone number storage list is being displayed (step 408), the process ends.

In the process shown in FIG. 4, when the process is completed with data on the telephone number storage list, the data on the telephone number storage list is displayed at any time to call the corresponding party, Can be deleted. FIG. 5 is a flowchart showing the operation in that case.

In FIG. 5, the display button 108 is pressed while the key telephone 1 is empty (step 501).
At this time, the CPU 101 determines whether or not there is a telephone number storage list in the memory 102 (step 502). If there is a telephone number storage list, the CPU 10
1 displays the data of the telephone number storage list on the memory 102 on the display 103 via the display control device 105 (step 408). Thereafter, the processing after step 408 in FIG. 4 is performed (when there is a partner to be called back, the transmission button is pressed, and when there is data to be deleted, the deletion button is pressed).

As described above, the telephone terminal according to the present invention is capable of receiving an incoming call from a third party while busy.
The telephone stores the caller's telephone number notified from the exchange, and when the call is terminated and on-hook, an alarm lamp is turned on immediately after that to notify that there is an incoming call during the call. Further, it is possible to freely select whether or not to return the call to the other party by a simple operation. Further, unnecessary data can be arbitrarily deleted.

As a second embodiment of the present invention, a timer function is further added so that if the called party is busy or no answer, the call is automatically restarted after a certain period of time. There are some that make calls. FIG.
The configuration is shown in FIG.

Referring to FIG. 6, the second embodiment of the present invention has a timer 114 for recalling after a fixed time in addition to the configuration of the first embodiment shown in FIG. Different in that.

Next, the operation of the second embodiment of the present invention will be described with reference to the drawings.

FIG. 7 is a diagram showing a state in which a call is made to a caller who received an incoming call during a call in FIG. It is a flowchart of the process which calls.

When calling back to the corresponding party in FIG. 4 (FIG. 4, step 411), it is determined whether or not the connection has been established with the other party (FIG. 7, step 701). Then, the corresponding data in the telephone number storage list on the memory 102 is deleted (step 702), and the process ends.

If the connection cannot be established (that is, the other party is busy or no answer), the user determines whether or not to call the other party again (step 703).

In the case of calling again, the dial button 107 is pressed, and after a few minutes, it is specified that the call is to be called again, and the call button 110 is pressed (step 704). The time for recalling can be specified from 01 to 99 in minutes. For example, 5
If it is desired to call again after a minute, the dial 107 is input as 05 and the call button is pressed.

FIG. 8 shows the recall setting (step 7).
04) is the data stored at the time, and the telephone number of the partner to be recalled and the time until the recall is performed (unit:
Minute) is stored. (This (telephone number + time until recall) is hereinafter referred to as recall data.) The setting for performing this recall is one at a time.
If recall is set (step 704), the memory 1
The recall data is set on the memory 102 at this time. At this time, the CPU 101 determines whether another recall data has already been set on the memory 102 (step 705). An error message indicating that another recall data is registered is displayed on the display 103 via the display control device 105 (step 706). The subsequent operation is the first operation of the present invention.
The operation is the same as that of the embodiment. (FIG. 4, step 413 and thereafter).

At this time, if the recall data is not set in the memory 102, the CPU 101 activates the timer 114 for performing the recall after the set time (step 707), and stores the recall data in the memory 102. The recall data is set on the display 103 (step 708), and the set recall data is displayed on the display 103 via the display control unit 105 (step 709).

When recalling is not performed (step 703, NO), the subsequent operations are the same as those in the first embodiment of the present invention (FIG. 4, step 413).
Or later).

FIG. 9 is a flowchart showing a process of recalling when the set recall time has come.

First, the CPU 101 cancels the timer 114 which has set the recall time (step 9).
01). Here, CPU 101 determines whether or not the own telephone to be recalled is free (step 90).
2) If it is not empty, the recall data is deleted from the memory 102 (step 903), and the process is terminated to stop the setting of the recall. If the own telephone is free, a call is made using the telephone number set in the recall data (step 904), and the recall data is stored in the memory 10.
Delete from 2. In the subsequent processing, the processing from step 701 is repeated.

As described above, in the other embodiment of the present invention, in addition to the first embodiment of the present invention, if the called party cannot talk on the phone due to busy, etc., the time is reduced. And automatically recall the other party, the possibility that the other two parties can talk can be further increased.

Next, a third embodiment of the telephone terminal according to the present invention will be described.

According to the third embodiment of the present invention, when a call arrives at the telephone terminal of the called party but the called party is not answered due to absence or the like, the caller number of the incoming call is stored. To display. Therefore, in the present embodiment, the exchange accommodating the telephone terminal does not have to be an ISDN subscriber exchange or a private branch exchange which separately provides a communication channel and a signal channel. That is, if a function is provided for notifying the telephone terminal of the caller's number at the time of an incoming call, the notification may be transmitted via a signal channel separated from the call channel, It may be an interface that is transmitted by a multi-frequency signal or the like via a communication path.

The configuration may take any of the configurations shown in FIG. 1 or FIG.

FIG. 10 shows a flowchart of the process according to the third embodiment of the present invention.

First, in the exchange 2, when a call arrives at the key telephone 1 to which the present invention is applied (step 100).
1), the line state of the key telephone 1 is identified (step 1002). If the key telephone 1 is busy, the calling party may hear a busy tone to urge disconnection, and the processing may be terminated by disconnecting the caller. The processing of the first embodiment may be performed. When the key telephone 1 is in an idle state, the caller number of the call is notified to the terminal side (step 1005), and a call signal is transmitted (step 1006) to call the called party. At this time, the notified caller number is displayed on the display 103 on the key telephone 1.

If the called party answers this call (step 1007, Yes), a normal connection is made and the call between the calling party and the called party is started. Then, the notified and displayed caller number is deleted.

On the other hand, if the called party does not answer this call due to absence or the like and the caller abandons this call (step 1009) and disconnects, the key telephone 1 is notified and displayed. In the same manner as in the first embodiment described above, data obtained by adding the caller number to the caller number with the time at that time as the arrival time is stored as a telephone number storage list (step 1010). Then, the alarm lamp 113 is turned on (step 1011) to indicate that there is an incoming call while absent.

Thereafter, the user sets the alarm lamp 11
When you know that there is an incoming call while you are away by the lighting of 3,
Similar to the operation of FIG. 5 in the first embodiment described above, the display button 108 is pressed to call up the telephone number storage list, and the operation is returned, erased, or deleted by the same operation from step 408 in FIG. Hold operation can be performed. In this embodiment, the lit alarm lamp 113 is turned off when the display button 108 is pressed.

As described above, in the third embodiment of the present invention, a telephone terminal having a normal analog telephone interface can be used as an answering machine if it receives the caller ID notification service from the exchange. It is possible to know the caller ID of a call that arrives while not present without answering the incoming call. Therefore, the answering machine has a response to the answering machine and is charged accordingly. However, in the third embodiment of the present invention, there is no response, and the caller is not charged. This has the effect of being able to know the originator of the incoming call in accordance with the above.

According to the third embodiment of the present invention, it is possible to combine the above-described second embodiment and set the time for the recall operation. Further, if the telephone terminal is provided with an ISDN interface or a multifunctional telephone terminal accommodated in a private branch exchange in which a communication channel and a signal channel are separated, the first to third embodiments will be described. A configuration including all combinations may be employed.

[0061]

As described above, the telephone terminal according to the present invention is capable of receiving an incoming call of a third party during a call.
The phone number of the caller is stored, and the presence of the caller and the phone number are immediately notified by an alarm lamp when the call ends, so that the user can immediately know the presence of the incoming call during the call. Can be.

Further, since there is provided a structure for making a call back using the stored telephone number of the calling party, and the structure is such that the call can be made immediately or on hold and later made. Flexible recall operation becomes possible.

Further, when a call cannot be made due to the other party being busy at the time of calling back, there is a configuration in which the call can be called back at a designated time, so that there is a possibility that the two parties can talk. It will be even higher.

Further, since a structure is provided for storing a caller number of a call that has been received while the user was absent and has not been answered, the caller number of an incoming call that is absent even if the answering machine function is not provided. You can know.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a flowchart of a process performed by the exchange 2 and the key telephone 2 when an incoming call is received from a third party while the key telephone is in a call;

FIG. 3 shows an example of data contents (telephone number storage data) stored in a memory.

FIG. 4 is a flowchart of a process when the key telephone sets back to the caller immediately after the end of the call.

FIG. 5 is a flowchart of a process when the key telephone sets back a caller at an arbitrary time.

FIG. 6 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 7 is a flowchart of a process performed when recalling is set when a call to the other party called back by the key telephone is busy or the like.

FIG. 8 shows an example of the contents of recall data stored in a memory.

FIG. 9 is a flowchart of a process when the key telephone sets a recall.

FIG. 10 is a flowchart illustrating an operation of the third exemplary embodiment of the present invention.

[Explanation of symbols]

 1 button telephone 2 exchange 101 CPU 102 memory 103 display 104 line interface 105 display control device 106 input control device 107 dial button 108 display button 109 scroll button 110 call button 111 delete button 112 end button 113 alarm lamp

Claims (8)

[Claims] 1. A circuit interface in which a call channel and a signaling channel are separated from each other, and a caller ID of a call encountered during a call of a called terminal is transferred to the called terminal by a call via the signal channel. Line interface means for interfacing with the exchange, comprising: means for receiving a caller ID of an incoming call during a call transferred via the signal channel during a call, Memory means for storing the received caller number of the incoming call, and monitoring the line interface means, and when the caller number of the incoming call is received from the exchange, the caller number is stored in the memory means. When the telephone terminal becomes idle, the stored information in the memory means is confirmed and the caller number of the incoming call during the call is stored in the memory means. Telephone terminals, characterized in that a process control means for performing an alarm display when you are. 2. The telephone terminal further comprises an operation input means and a display means, and the processing control means, when a display button of the operation input means is pressed, displays the incoming call during call stored in the memory means. 2. The telephone terminal according to claim 1, wherein a caller number is displayed on said display means. 3. The processing control means transfers the caller number of the incoming call during call displayed on the display means to the line interface means when the call button of the operation input means is pressed, and The telephone terminal according to claim 2, wherein a call based on the number is transmitted. 4. The telephone terminal further comprises timer means, wherein the processing control means sets a count time of the timer means by pressing a dial button of the operation input means, and thereafter, sets the operation input means. 4. When a call button provided by the user is pressed, a call based on the caller number of the incoming call during call displayed on the display means is transmitted after counting the counting time set in the timer means. Telephone terminal as described. 5. A telephone terminal accommodated in an exchange for notifying a called terminal of a call arriving at the called terminal to the called terminal, and receiving a caller number of the incoming call transferred from the exchange. Line interface means for interfacing with the exchange including means, display means for displaying a caller number of the received incoming call, monitoring the line interface means, and responding to an incoming call from the exchange. A telephone control unit that stores a caller number of the received incoming call in a memory unit when the telephone terminal becomes idle without any processing, and further displays an alarm. 6. The telephone terminal further comprises operation input means, wherein the processing control means displays a caller ID of the incoming call stored in the memory means when the display button of the operation input means is pressed. When the call button of the operation input means is pressed, the caller number of the incoming call displayed on the display means is transferred to the line interface means to display a call based on the caller number. 6. The telephone terminal according to claim 5, wherein the terminal transmits the call. 7. A circuit interface, wherein a call channel and a signaling channel are separated, and when an incoming call is encountered while the called terminal is busy, the calling party number of the call is transmitted to the busy called terminal. A telephone provided with memory means and display means accommodated in an exchange for transferring the caller ID of the call to the called terminal via the signal channel before the call if the called terminal is free when the called terminal is idle A terminal, which monitors the line interface means, and transfers the caller number to the memory means when the caller number is received from the exchange when the telephone terminal is in a busy state; Is reached, the stored information in the memory means is confirmed, and an alarm display is displayed when the caller number of the incoming call during the call is stored in the memory means, and When a call arrives at the telephone terminal and the caller number is received, the caller number is transferred to the display means, and when the telephone terminal becomes idle without responding to the incoming call, the received incoming call is received. And a processing control means for accumulating the caller number in the memory means and displaying an alarm. 8. The telephone terminal further includes operation input means, and the processing control means displays a caller number of the incoming call stored in the memory means when the display button of the operation input means is pressed. When the call button of the operation input means is pressed, the caller number of the incoming call displayed on the display means is transferred to the line interface means to display a call based on the caller number. The telephone terminal according to claim 7, wherein the telephone call is transmitted.