JP2002152383A - Button telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically select a line in which origination destination clear- down services are not registered at the time of capturing the line. SOLUTION: In a button telephone system, a plurality of lines 31 and button telephone sets 20A to 20N are accommodated in a main system 30, and further in a case where an origination designation is busy at the time of origination via the line, if a predetermined services registration operation is carried out by the button telephone set, services of notifying clear-down of a designation via the line from a telephone network at the time of clear-down of the designation are provided. The main system has a table 40A which manages presence or absence of a services registration state in each line, and when a registration button of the button telephone set is depressed, a services non-registration line in the table 40A is automatically captured, and a dial origination is carried out via this capture line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main apparatus for accommodating a plurality of telephone lines provided with a call termination notification service from a telephone network, and a plurality of key telephones connected to the main apparatus. Button telephone apparatus.

[0002]

2. Description of the Related Art In a public telephone network, a call end destination notification service is provided. This service is a service in which, when a calling party is busy, a predetermined registration operation is performed from the calling side telephone apparatus to the network side to notify the calling side telephone apparatus of the subsequent call destination end call. Hereinafter, FIGS. 6 to 8
With reference to FIG. FIG. 6 is a sequence diagram showing the operation of the call termination notification service, FIG. 7 is a signal waveform diagram showing an incoming signal at the time of call termination notification, and FIG. 8 is a timing chart of the call termination notification. .

In FIG. 6, a calling telephone device and a called telephone device are respectively connected to a telephone network via telephone lines. First, it is assumed that the caller telephone device captures the telephone line in response to the user's operation and transmits the call destination, that is, the telephone number of the receiver telephone device, thereby making a call to the receiver telephone device (step 70). In response to this, the telephone network checks the status of the receiving telephone device, and if the receiving telephone device cannot be called, for example, when the receiving telephone device is busy with another telephone device, the receiving telephone device receives a busy tone. The side telephone device is notified that it is in use (step 71). In response, the calling telephone device disconnects the telephone line (step 72).

[0004] Here, when the user wants to make a telephone call to the called side, the user performs a service registration operation in order to use the caller's end-of-call notification service. First, the calling telephone device captures the telephone line and sends out a dial "159" (step 73). As a result, a voice message regarding the contents of the service is notified from the telephone network (step 7).
4). Then, by sending a dial "1" for instructing service registration from the calling side telephone device, service registration is performed (step 75), and a voice message regarding completion of service registration is notified from the telephone network (step 76). ), The registration process of the call destination end call notification service ends.

Accordingly, the telephone network starts a call destination call end notification service, and in response to the registered call termination of the called-side telephone device, the calling-side telephone device is called by an SIR incoming call described later (step). 80). When the originating telephone device responds to this SIR call (step 81), a voice message regarding the termination of the receiving telephone device is notified from the telephone network (step 82). As a result, the user knows that the receiving-side telephone device has finished talking and is ready to call, and once disconnects the telephone line (step 83).

Subsequently, the telephone line is recaptured and the dial "159" is transmitted (step 84).
A voice message about the contents of the service from the telephone network is notified (step 85). Then, by sending a dial "3" for instructing the other party to call from the originating telephone device (step 86), a call is made from the telephone network to the receiving telephone device (step 87). (Step 88), the calling telephone device and the called telephone device are connected via the telephone network,
A call between the two is started (step 89). By using such a destination-end-call notification service, the calling-side telephone device can know the end of the called-side telephone device, and can easily perform the operation after the destination-end notification from the telephone network. Can call the called telephone device.

In this service, when the telephone network notifies the calling telephone device of the other party's end call, as shown in FIG. 7, an SIR call different from a normal IR call is used. As shown in FIG. 7 (b), the ringing pattern of the IR
Ringing for 1 second ON period (16H for analog telephone line)
z frequency signal) is repeated at a cycle of 3 seconds. On the other hand, in the ringing pattern of the SIR incoming call, 0.25 to 0.3
After a short on-period sound of seconds (t1),
There is a short off-period of 0.3 seconds (t2) and an additional 0.
A short on-period sound of 25 to 0.3 seconds (t1) is provided. And sandwich such a short off period,
Two on-period sounds (16 Hz for analog telephone lines)
Frequency signal) is 3 seconds cycle, 12 times in total (about 36 seconds)
Repeated.

[0008] In the telephone network, assuming that the originating telephone device cannot respond to such an SIR call for some reason, as shown in FIG. 8, a 5-minute interval (T2) from the first SIR call is received. Is used to call the outgoing telephone apparatus by using the SIR reception four times. At this time, the period during which the call can be recalled from the telephone network with the dial “3” following the dial “159” after responding to the SIR call is within 5 minutes from the response to the SIR call in consideration of the reduction of the load on the telephone network side. Is restricted to Further, when the response to the SIR call arrives, it is considered that the caller's end-of-call notification service has been completed. Therefore, for example, when responding to the first SIR call, the remaining three SIR calls are terminated.

In addition, when monitoring the call termination of the destination telephone device, a period during which the call termination of the destination telephone device is monitored, that is, the waiting time (T
1) is limited to 45 minutes from the point of service registration. As a voice message from the telephone network to the calling telephone device, a registration completion notification message (M
In addition to 1), there is an end-of-call notification message (M2) that is sent out when the calling telephone device responds to the SIR call. If the other party's call waiting time (T1) exceeds 45 minutes, a service end notification message (M3) is sent out when responding to the first SIR call.

[0010]

By the way, some key telephone apparatuses accommodating a plurality of lines and key telephones include:
Some key telephones have a function of automatically capturing a free line and dialing out only by operating an auto-dial key without pressing a line key on the key telephone side to capture the line. When the call destination is busy for such an auto-dial call, the dial is set to “15” in order for the user to use the call termination service described above.
After pressing "9", even if the user attempts to register the service by pressing the dial "1", the service cannot be registered if the service is already registered on the line by the user of another key telephone. Was. Accordingly, it is an object of the present invention to automatically select a line for which a call termination service is not registered when a line is captured.

[0011]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides a call termination notification service for a call destination, wherein when the call destination is busy, the line is reacquired and the call is transmitted from the call source. By sending a predetermined dial and registering the other party's end call notification on the telephone network side, a service is provided for notifying the end of the call destination by a special incoming call from the telephone network to the caller. In a key telephone device comprising a main device connected to a plurality of lines and a key telephone housed in the main device, the main device manages the presence or absence of a service registration state for each line (table 40A). ) And line control means for automatically acquiring an unregistered line of the service managed by the management means when a predetermined operation of the key telephone is detected. The line control means is provided with automatic dial means for automatically capturing a line for which service has not been registered, and then automatically transmitting a dial number registered in advance to the captured line. The apparatus further comprises a function setting means for setting an automatic acquisition function of a service-unregistered line. When a predetermined operation of the key telephone is detected, the line control means sets the automatic acquisition function of the service-unregistered line by the function setting means. If it is, the service unregistered line is automatically captured. When registering a dialed number, the system further comprises a function registering means for registering the presence or absence of an automatic acquisition function of a service unregistered line in association with the dialed number. When a predetermined operation of the key telephone is detected, the line registering means registers the function. If the automatic acquisition function of the service unregistered line is registered by the means, the service unregistered line is automatically acquired, and the dial number is transmitted to this acquired line.

[0012]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a key telephone apparatus showing an embodiment of the present invention. In this example, an analog button in which a main unit is connected to an analog telephone line provided with a call termination notification service from a telephone network. A telephone device is shown as an example.

Main device 30 is connected to a plurality of analog telephone lines (hereinafter, external lines) 31 as described above, and has a plurality of key telephones (hereinafter, slave units) 20A to 20N.
Is housed. The main unit 30 also includes an external line I / F unit 32, an incoming signal detection unit 33, a BT detection unit 34, a voice recognition unit 35, a recording / reproducing unit 36, a T switch 37, and an extension line I / F unit 3.
8, a main control unit 39 and a main storage device 40 are provided.

Here, the outside line I / F section 32 performs acquisition of a plurality of outside lines 31 and transmission of a dial signal. Further, the incoming signal detection unit 33 identifies and detects a normal IR incoming call from a plurality of outside lines 31 and an SIR incoming call used in the caller's call termination notification service. The BT detector 34 detects BTs (busy tones) coming from a plurality of external lines 31. The voice recognition unit 35 recognizes voice messages from a plurality of outside lines 31 respectively.

The recording / reproducing section 36 records sounds from a plurality of external lines 31, reproduces the recorded sounds as necessary, and sends the reproduced sounds to the slave units 20A to 20N.
The T switch 37 is connected to the plurality of external lines 31 and the slave 20A.
This connects the communication path between ２０ and 20N. Extension I /
The F unit 38 performs data transmission and audio signal transmission between the slave units 20A to 20N. The main control section 39 executes a program in the main storage section 40 and controls the above-described sections in the main device 30. The main storage unit 40 stores, in addition to the program executed by the main control unit 39, data indicating a plurality of external lines required for control of the main control unit 30 and states of the slave units. A table 40A or the like shown in FIG. 3A is provided for managing the registration status of the destination call end notification service in the telephone network for each outside line and each child device.

On the other hand, the slave units 20A to 20N
And a transmission I / F unit 21 for transmitting data and voice, and performs digital / analog conversion of the voice signal and sends it to the handset HS, and also performs analog / digital conversion of the voice signal and sends it to the main device 30 side. And an operation unit 24 such as a dial button and a display element such as an LED or an LCD, and the state of the outside line 31 and the operation state of the slave unit. In addition to the visual display of call and call charges and the like, a display unit 25 for visually displaying the state of the call destination end call notification service, a memory 26, the handset HS and the speaker SP described above.

(First Embodiment) Next, with reference to FIGS. 4 and 5, the operation of the main part of the telephone apparatus will be described. First, the outside line transmission processing shown in FIG. 4 will be described. When the user makes a call to the other party in consideration of the other party's call termination notification service provided from the telephone network, the user presses a registration button in the operation unit 24 of the slave unit (step S1). Then, this is detected by the slave unit control unit 23 and transmitted to the main device 30 via the transmission I / F unit 21, and the main control unit 39 sets the extension I / F
The registration button data is received via the F unit 38. In this case, the main control unit 39 stores the table 40 in the main storage unit 40.
With reference to A, it is determined whether or not there is an empty outside line in the table 40A in which the call destination call end notification service is not set as a registration flag described later (step S2).

Here, when the unregistered outside line of the service does not exist in the table 40A, the busy display data is transmitted to the corresponding slave unit to indicate that there is no unregistered outside line on the display unit 25 of the corresponding slave unit. Perform busy display (step S
4). In this case, a vacant outside line having a high priority may be captured as usual. Meanwhile, the table 40
If there is an outside line in which the service is unregistered and vacant in A, the outside line I / F unit 32 is instructed to capture the unregistered outside line (step S3). Thereafter, when the user operates the dial button of the operation unit 24 of the slave unit and inputs the destination dial number (step S5), the dial data is received by the main control unit 39. In this case, the main control unit 39 The dial data is sent to the outside line I / F unit 32 to be sent out to the captured outside line (step S6), and at this time, the detection of the BT (busy tone) by the BT detection unit 34 is started (step S7).

Here, if no BT is detected, normal calling processing is performed because it is possible to call the other party (step S9). On the other hand, when the BT is detected, the call destination is busy during a call with another party, and the “other party busy?” In step S8 becomes “Y”. In this case, when the user performs a flash operation (hooking operation) for lowering and raising the handset HS, for example, (Step S)
10), the associated on-hook data and off-hook data are transmitted to the main control unit 39, and the main control unit 39
It instructs the / F unit 32 to temporarily cut the outside line to be captured again (step S10).

Thereafter, the user sets the dial button of the operation unit 24 of the slave unit to "1" in order to register the service.
When "5", "9", or "1" is operated, the dial button data is transmitted to the main control unit 39, and the main control unit 39 sends them to the outside line I / F unit 32 and sends them to the outside line as dial signals. (Step S12). A service is registered on the telephone network side by transmitting a dial signal for registering the service from an outside line to the telephone network side.

The main control unit 39 starts a process of detecting the registration of the call destination end call notification service shown in FIG. 5 (to be described later) in order to detect the registration of the service in the telephone network (step S13). Such service registration detection processing is continued until “registration detection end?” In step S16 becomes “Y”, and if an on-hook of the slave unit is detected during this detection processing (“Y” in step S14), Switching to the speaker reception mode (step S15), the detection process is continued.
Then, when the registration detection of the service is completed by the detection of the BT, the recognition of the voice message, or the expiration of the registration detection timer in the registration detection processing of the destination communication end notification service in FIG. Step S17) The process ends.

In the telephone network, the dial "159
If a service cannot be registered after receiving "1", a BT (busy tone) is transmitted about 10 seconds later, and if a service can be registered, a BT is transmitted about 1 minute later. When the service is registered in the telephone network, a voice message about the completion of the service registration is notified. FIG. 5 (a)
In the registration detection processing of the call termination notification service shown in (1), the BT sent from the telephone network is detected by the BT detection unit 34 to determine whether or not the service is registered. In this case, a 1.2-minute registration detection timer in the timer 39A is started (step S31), and detection of a busy tone is started (step S32).

Then, the main control unit 39 makes a BT detection judgment via the BT detection unit 34 (step S33) and judges whether the registration detection timer has expired (step S34), and the BT detection unit 34 detects the BT. Stop the registration detection timer (step S35), and determine whether the value of the timer is within a predetermined range (step S3).
6). Here, if the value of the registration detection timer is about one minute, it means that the service has been registered in the telephone network. In such a case, the timer value is determined to be within a predetermined range, and the main function is determined. The control unit 39 controls the table 4 in FIG.
A registration flag is set corresponding to the corresponding outside line of 0A and the corresponding slave unit (step S37).

On the other hand, if the value of the registration detection timer is about 10 seconds when a BT is detected, the service cannot be registered in the telephone network. In such a case, the timer value is out of a predetermined range. It is determined that there is, and the registration flag corresponding to the corresponding outside line and the corresponding slave in the table 40A of FIG. 3A is reset (step S38). If the BT detection unit 34 does not detect a BT and the registration detection timer times out and the determination in step S34 becomes "Y", then 1.
Even after two minutes have passed, the BT has not been detected yet, and in this case also, it is determined that the service has not been registered, and the registration flag corresponding to the relevant external line and the relevant child device in the table 40A of FIG. 3A is reset. (Step S38).

Further, in the registration detection processing of the call destination end-of-call notification service shown in FIG. 5B, a voice message regarding the completion of the service registration notified when the service is registered in the telephone network is detected. In this case, the main control unit 39 similarly starts the 1.2-minute registration detection timer in the timer 39A (step S41),
5 is started (step S4).
2).

Then, it is determined whether the registration detection timer has expired (step S43) and the end of the voice recognition by the voice recognition unit 35 (step S44). When the voice recognition by the voice recognition unit 35 ends, the main control unit 39 judges the recognition result. If the recognition result of the voice recognition unit 35 indicates a service registration completion notification message, the determination of “registration OK?” In step S45 is “Y”.
In this case, the main controller 39 controls the table 40A shown in FIG.
A registration flag is set corresponding to the corresponding outside line and the corresponding slave unit (step S46).

On the other hand, when the recognition result of the voice recognition unit 35 is other than the service registration completion notification message, step S45.
Of "Registration OK?" Is "N". In this case,
The registration flag corresponding to the corresponding outside line and the corresponding slave in the table 40A of FIG. 3A is reset (step S47).
If the voice recognition cannot be performed by the voice recognition unit 35 and the registration detection timer times out before the voice recognition by the voice recognition unit 35 ends and the determination in step S43 becomes “Y”, the main control unit 39 also performs Next, the registration flag corresponding to the corresponding outside line and the corresponding slave unit in the table 40A of FIG. 3A is reset (step S47).

As described above, the table 40 is used for capturing an outside line.
The call destination communication end notification service in A searches for an unregistered free outside line and automatically captures the outside line. This allows the slave unit to make a call afterwards,
At this time, even if the called party is busy, pressing the dial "159" and then pressing the dial "1" sets the registration flag of the called party's call termination service for the outside line. The service can be registered. Accordingly, it is possible to receive a service corresponding to the end of the call.

The above description is an example of an analog key telephone apparatus. However, as shown in FIG.
The main unit 30 accommodates the SDN line 31A.
1 can also be applied to a digital key telephone device connected to the key telephones 20A to 20N shown in FIG.

In this case, external line I / F section 32 of main unit 30
A makes a dial call to the telephone network, receives data indicating the busy state (the other party busy) of the other party from the telephone network, and registers registration notification data of the other party's call termination service from the telephone network. And the SIR incoming data is received and output to the main control unit 39.
Further, a voice recognition unit is provided in the external line I / F unit 32A, the voice recognition unit recognizes a voice message from the telephone network via the ISDN line 31A, and outputs a recognition result to the main control unit 39. Then, the main control unit 39 similarly performs the processing of each step of FIG. 4 and FIG.
For capturing an outside line, a search is made for an empty outside line for which the registration flag in the table 40A is not set (that is, the destination end-of-call notification service has not been registered), and the outside line is automatically captured. After the outside line I / F unit 32A makes a dial call based on the dial operation of the outside line, and if the other party is busy, dial data "1591" based on the dial operation of the slave unit is transmitted from the outside line I / F unit 32A. ,
The external line I / F unit 32 receives the data indicating that the other party is talking and the registration notification data from the telephone network, and recognizes the voice message.
A and outputs the service, and the presence or absence of the registration of the service is determined based on the output result of the external line I / F unit 32A and the registration detection timer in the timer 39A.

(Second Embodiment) In the first embodiment, when the registration button is pressed, the table 4 shown in FIG.
0A is searched and the registration flag is not set, and the call termination destination notification service captures an unregistered free outside line. In the second embodiment, however, the registration button of each slave unit is used. Correspondingly, the auto-dial number is registered in the table 40C shown in FIG. Then, the main control unit 39
When the registration button is pressed on the slave unit in step S1 in FIG. 4, the table 40A is similarly searched, and in step S3 in FIG.
(Or external line I / F unit 32A). Here, the user of the slave unit operates the main control unit 39 without dialing.
Reads out the auto-dial number registered in the table 40C corresponding to the registration button of the slave unit, and in step S6 of FIG.
2 (or the external line I / F unit 32A) and transmit it as a dial signal via the captured external line.

At this time, as shown in FIG. 3 (b), it is possible to set as a system whether or not the automatic acquisition function of the service unregistered outside line can be set, and if the service unregistered outside line automatic acquisition function is set (service When the unregistered outside line automatic capture flag 40B is ON), the main control unit 39 performs the processing shown in FIG.
(A) Searching the table 40A and causing the call destination end call notification service to catch an unregistered vacant outside line by the outside line I / F unit 32 (or the outside line I / F unit 32A), while automatically catching a service unregistered outside line. When the function is not set (when the service unregistered outside line automatic capture flag 40B is OFF), a plurality of outside lines are searched from the youngest or oldest, and a vacant outside line is searched for in the outside line I / F unit 32 (or outside line). I / F section 3
2A).

When registering an auto-dial, FIG.
In the table 40C shown in (c), this auto-dial number is registered, and in addition to the auto-dial number, the availability of the service unregistered outside line automatic acquisition function is registered. Then, when the registration button is pressed on the slave unit in step S1 of FIG. 4, the main control unit 39 automatically registers the auto-dial number registered in the table 40C and the service unregistered outside line corresponding to the registration button of the slave unit. The main control unit 39 reads the availability information of the capturing function and if it is registered that the service-unregistered outside line can be automatically captured, the table 40A is searched, and in step S3 in FIG. / F unit 32 (or external line I / F unit 32A). Then, the read out auto-dial number is shown in FIG.
In step S6, the external line I / F 32 (or the external line I / F 32A) is transmitted as the dialed party number, and transmitted as a dial signal via the captured external line.
If it is registered that the service unregistered outside line automatic acquisition is not possible, the main control unit 39 searches a plurality of outside lines from the youngest or oldest, and finds a vacant outside line to the outside line I / F unit 32 (or outside line I / F unit 32). / F section 32A). Then, in step S6 in FIG. 4, the read out auto-dial number is used as the other party's dial number as the external line I / F 32 (or the external line I / F).
F section 32A) so as to be transmitted as a dial signal via an outside line.

[0034]

As described above, according to the present invention, a button composed of a main unit connected to a plurality of lines for providing a call end destination notification service and a slave unit connected to the main unit. In the telephone device, management means (table 40A) for managing the presence / absence of service registration status in the main device for each line.
When the main unit detects a predetermined operation of the slave unit, the main unit automatically captures an unregistered line of the service managed by the management unit. Even if the call destination is busy, the call termination notification service can be registered for the outside line by a predetermined service registration operation. Accordingly, it is possible to receive a service corresponding to the end of the call.

Also, the main unit automatically captures a line for which service has not been registered, and then automatically sends a dial number registered in advance to the captured line, thereby eliminating the need for a user's dialing operation. . The apparatus further includes a function setting unit for setting an automatic acquisition function of a service unregistered line. When the line control unit detects a predetermined operation of the slave unit, the function setting unit sets the automatic acquisition function of the service unregistered line. In such a case, the service unregistered line is automatically acquired, so that the setting according to the use state of the user can be performed, and thus the usability of the user is improved. . When registering a dialed number, the system further comprises a function registering means for registering the presence or absence of an automatic acquisition function of a service unregistered line in association with the dialed number. When a predetermined operation of the key telephone is detected, the line registering means registers the function. If the automatic registration function of the service unregistered line is registered by means, the service unregistered line will be automatically captured and the dial number will be sent to this captured line, so each user will be able to use his / her own usage status. Accordingly, the function of automatically acquiring a line for which service has not been registered can be set, and the usability of the user is further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a key telephone apparatus according to the present invention.

FIG. 2 is a block diagram of a main device of the digital key telephone device.

FIG. 3 is a diagram showing a configuration of a table in a main storage unit of the main device.

FIG. 4 is a flowchart showing the operation of the main part of the key telephone apparatus.

FIG. 5 is a flowchart showing an operation of a main part of the key telephone apparatus.

FIG. 6 is a sequence diagram showing an operation of a call destination end call notification service.

FIG. 7 is a signal waveform diagram showing an incoming signal at the time of notification of a call end of a call destination.

FIG. 8 is a timing chart of a caller's end call notification.

[Explanation of symbols]

20A to 20N: key telephone (slave), 21: transmission I
/ F section, 22: voice processing section, 23: slave unit control section, 24 ...
Operation unit, 25 display unit, 30 main unit, 31 analog telephone line, 31A ISDN line, 32, 32A external line I / F unit, 33 ... incoming signal detection unit, 34: BT detection unit,
35: voice recognition unit, 36: recording / playback unit, 37: T switch,
Reference numeral 38: extension I / F unit, 39: main control unit, 39A: timer, 40: main storage unit, 40A, 40C: table, 40
B: Service unregistered outside line automatic acquisition flag.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Onozuka 2-3-2 Shimomeguro, Meguro-ku, Tokyo F-term in Tamura Electric Co., Ltd. (Reference) 5K015 AA01 AD01 FA01 FA05 5K024 AA36 CC04 DD01 DD02 FF06 5K049 AA15 BB05 BB17 BB22 BB23 CC03 CC11 EE01 EE02 FF32 FF39 FF41

Claims (4)

[Claims] Claims: 1. As an outgoing call termination notification service, when the outgoing call destination is busy, reacquire the line, send a predetermined dial from the caller, and register the outgoing call end notification to the telephone network side. A main unit connected to a plurality of lines provided with a service of notifying the end of the call destination by a call from the telephone network to the caller by a special call, and accommodated in the main unit. A key telephone apparatus comprising: a key telephone set; a main unit comprising: a management unit configured to manage presence or absence of a registered state of the service for each line; and a management unit configured to detect a predetermined operation of the key telephone unit. And a line control unit for automatically acquiring an unregistered line of the service managed by the key telephone system. 2. The automatic dialing means according to claim 1, wherein said line control means automatically captures an unregistered line of said service and then automatically sends a dial number registered in advance to said captured line. A key telephone device comprising: 3. The function setting means according to claim 1, further comprising function setting means for setting an automatic acquisition function of a service unregistered line, wherein said line control means detects a predetermined operation of said key telephone by means of said function setting means. A key telephone apparatus for automatically acquiring a service unregistered line when an automatic registration function for an unregistered line is set. 4. The line control unit according to claim 1, further comprising: a function registering unit for registering, when registering the dialed number, the presence or absence of an automatic acquisition function of an unregistered service line in association with the dialed number. When a predetermined operation of the key telephone is detected, if a function for automatically registering a service unregistered line is registered by the function registering means, the service unregistered line is automatically captured, and the dial number is assigned to the captured line. A key telephone device.