JP2000115823A - Key telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an key telephone system by which the system automatically acquires a leased line through the entering of a predetermined emergency dial number, independently of a specific for each system and identification information (such as an ID number) given to each terminal is automatically transmitted via the leased line. SOLUTION: A discrimination section 17a discriminates whether or not a dial number entered by the user matches a predetermined number. When non- matching is discriminated, a communication link generating section 17b makes a normal extension or external connection control. However, when matching is discriminated, an extension line or an external line being caught a entering of a dialing number is interrupted and a leased light 4 is acquired newly, and identification information stored in a memory 16 is transmitted via the leased line 4 as a DTMF signal by an identification information transmission section 17c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an ID (identification information).
The present invention relates to a key telephone system having a sending function.

[0002]

2. Description of the Related Art In recent years, with respect to button telephone apparatuses having various functions, it has been studied to enhance an external communication function in an emergency. For example, in Japan, like a 110/119 call, a line is connected to a specific agency such as the police or fire department just by transmitting a specific telephone number from any telephone terminal, and a call can be made.

In the United States, a dedicated line for making an emergency call is provided in the system, and in a case of an emergency, a terminal communicates with a monitoring station such as a police station via the dedicated line in an emergency. At that time, it is required that the system automatically transmit identification information (such as an ID number) assigned to each terminal.

[0004] A specific telephone number is assigned to the leased line, and the user can make an emergency contact by sending this telephone number. However, this system has the following drawbacks. That is, a different number must be assigned to each terminal as a telephone number for connecting to the dedicated line. For this reason, the user has to know in advance the emergency telephone number to be used for each terminal. However, a user who has faced an emergency situation does not always know this number, and thus an appropriate emergency call operation may not be performed, which has been a serious problem.

Furthermore, the key telephone apparatus generally has an extension calling function. In this case, in order to connect to an outside line, it is often necessary to take up the receiver and perform a predetermined operation. However, again, users who face an emergency are not always familiar with this operation procedure,
For this reason, an appropriate emergency call operation may not be performed, which has been a serious problem.

[0006]

As described above, in the conventional key telephone apparatus, it is necessary to use a different telephone number for each terminal when making an emergency call. Therefore, a user who does not know the telephone number cannot perform an appropriate emergency call operation, which is very inconvenient. Also, the outside line transmission operation may differ for each key telephone device, and a user who does not know this operation procedure cannot perform an appropriate emergency transmission operation, which is very inconvenient.

Therefore, an object of the present invention is to provide a case where the key telephone apparatus is capturing an extension, a case where an external line is being captured, or a case where no line has been captured even in an off-hook state. However, the system automatically captures a dedicated line by inputting a predetermined emergency calling number, and automatically transmits identification information (such as an ID number) assigned to each terminal via the dedicated line. To provide a key telephone system that enables an emergency call to be performed by a common operation between users regardless of a unique setting for each system.

[0008]

In order to achieve the above object, the present invention comprises a plurality of key telephones, and a main unit which accommodates each of the key telephones in an extension and which is connected to a central office line and a dedicated line. In a key telephone system provided with the key telephone system, storage means for storing identification information, determination means for determining the selection information of a call destination input at the key telephone, communication link forming means, and transmitting the identification information Identification information sending means is provided. The storage means stores the identification information given to each of the key telephones or each group, and the selection information of the transmission destination inputted in the key telephone by the determination means is stored in the predetermined transmission destination. It is determined whether or not it is a corresponding one. If the communication link forming means determines that the selection information of the call destination does not correspond to the predetermined call destination by the determination means, a communication link is formed via the line being captured, On the other hand, if it is determined that they correspond, the dedicated line is newly acquired to form a communication link with the predetermined destination. And, when a communication link is formed between the predetermined transmission destination by the communication link forming means by the identification information sending means,
The identification information of the originating key telephone is read from the storage means, and the identification information is transmitted to the destination via the communication link.

According to the present invention by taking the above measures,
Regardless of the telephone number assigned to each dedicated line, the system automatically captures the dedicated line by inputting a common calling number between users, and is assigned to each terminal such as an ID number through this dedicated line. It is possible to automatically send the identified identification information.

Further, according to the present invention, the communication link forming means is provided, if it is determined that the selection information of the transmission destination corresponds to a predetermined transmission destination, and if the line being acquired is an extension, The extension currently being acquired is released, and the exclusive line is newly acquired to form a communication link with the predetermined destination.

With such a configuration, even a user who does not know the detailed operation procedure of the terminal can perform an appropriate emergency call only by performing the extension call operation.
Further, the present invention provides the communication link forming means, when it is determined that the selection information of the transmission destination corresponds to a predetermined transmission destination, and when the line being captured is an outside line, An outside line is released and the exclusive line is newly captured to form a communication link with the predetermined destination.

With such a configuration, even a user who does not know the detailed operation procedure of the terminal can perform an appropriate emergency call only by performing an outside line call operation.
Further, the present invention provides the communication link forming means, when it is determined that the callee's selection information corresponds to a predetermined callee, even if the caller's key telephone is in an off-hook state, When the line is not captured, the dedicated line is captured to form a communication link with the predetermined destination. With such a configuration, even a user who does not know the detailed operation procedure of the terminal can perform an appropriate emergency call only by performing the off-hook operation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of a system to which the key telephone system according to the present embodiment is applied. In the figure, a key telephone 2 (2-1 to 2-m)
The main device 1 for accommodating a station line 3 and a dedicated line 4
Is connected to a public network NW and a monitoring center for receiving emergency calls.

FIG. 2 is a block diagram showing the configuration of the key telephone system according to this embodiment. In the key telephone system shown in FIG. 2, m key telephones 2 (2-
1 to 2-m).

The main unit 1 includes a time switch 10, a timing generation circuit 11, and m extension interfaces 12 (1
2-1 to 12-m), a station line interface 13, a dedicated line interface 14, a sub control unit 15, a memory 16, and a main control unit 17. Extension interface 12-
1 to 12-m, the line interface 13 and the leased line interface 14 are connected to the sub control unit 15 via the data highway 18. A time switch 10, a sub control unit 15, a memory 16, and a DTMF generation circuit 19;
Are connected to the main control unit 17 via a bus 20.

The time switches 10 are connected to extension interfaces 12-1 to 12 -m, a line interface 13, a dedicated line interface 14, and a DTMF generating circuit 19 via a PCM highway 21. Then, based on the control of the main controller 17 and various timing signals generated by the timing generation circuit, the PC
By exchanging the time slots on the M highway 21, the respective lines are switched and connected.
The DTMF signal generated by the F generator 19 is input to the dedicated line interface 14.

The key telephones 2 are connected to the extension interface 12, respectively. This extension interface 1
2, conversion of an audio signal (analog) output from the key telephone 2 to a PCM signal, conversion of a PCM signal supplied via the time switch 10 to an audio signal (analog), state monitoring of the key telephone 2, An extension interface operation such as transmission of various signals to the key telephone 2 is performed. The extension interface 12 exchanges control signals related to the extension interface operation with the main control unit 17 via the sub control unit 15.

The office line 3 is connected to the office line interface 13. The office line interface 13 converts an audio signal (analog) arriving via the office line 3 into a PCM signal, and outputs a PC signal supplied through the time switch 10.
Office line interface operations such as conversion of the M signal into an audio signal (analog), monitoring of the state of the office line 3, and transmission of various signals to a network connected via the office line 3 are performed. The office line interface 13 exchanges control signals related to the office line interface operation with the main control unit 17 via the auxiliary control unit 15.

The dedicated line interface 14 has a dedicated line 4
Is connected. The dedicated line interface 14 converts a voice signal (analog) arriving via the dedicated line 4 into a PCM signal, converts a PCM signal provided via the time switch 10 into a voice signal (analog), And a dedicated line interface operation such as transmission of various signals to a monitoring center connected via the dedicated line 4. Dedicated line interface 14
Transmits / receives a control signal related to the above-described dedicated line interface operation to / from the main control unit 17 via the sub control unit 15.

The sub-control unit 15 is mainly composed of, for example, a microcomputer, and operates between the main control unit 17 and the extension interfaces 12-1 to 12-m, the office line interface 13, and the leased line interface 14. Mediate the exchange of data.

The memory 16 is used as an external storage device for the main controller 17 to store various data. This data includes, for example, the key telephone 2-
There is an ID number or the like as identification information assigned to each of 1 to 2-m.

The main control unit 17 is constituted mainly by a microcomputer, for example, and includes a determination unit 17 in addition to well-known general control means in a key telephone system.
a, communication link forming unit 17b and identification information transmitting unit 17
c. Here, the determination unit 17a determines whether or not the telephone number input on the key telephone 2 corresponds to the telephone number of the monitoring center connected to the leased line 4. Further, the communication link forming unit 17b
If the determination unit 17a determines that there is no correspondence between the two telephone numbers, normal telephone line connection control is performed. on the other hand,
When it is determined that both telephone numbers are compatible, the dedicated line 4 is captured to form a communication path with the monitoring center. The identification information transmitting unit 17c transmits the ID number stored in the memory 16 to the monitoring center when the communication link forming unit 17b forms a communication path with the monitoring center. ing. This I
The D number is, for example, DTMF (Dual Tone Multi Frequenc).
y) is sent out as a signal and is generated by a DTMF generation circuit 19 described below.

The DTMF generating circuit 19 is used for the key telephone 2
DTMF in response to key input on dial key 24
In addition to the normal operation of generating a signal (PCM signal), the DTMF signal corresponding to the ID number stored in the memory 16 under the control of the main control unit 17 is input to the dedicated line interface 14 via the PCM highway 21. It has become.

On the other hand, the key telephone 2-1 is
2. Handset 23, input / output interface 24, dial key 25, function key group 26, LED group 27, LE
D drive circuit 28, LCD (Liquid Crystal Display) 2
9, an LCD drive circuit 30, a memory 31, and a telephone control unit 32;
The dial key 25, function key group 26, LED drive circuit 28, LCD drive circuit 30, and memory 31 are connected to a telephone control unit 32 via a bus 33.

The communication circuit 22 is connected to the handset 23 and the extension interface 12-1 of the main unit 1, respectively, and receives a speech signal from the extension interface 12-1 to receive the speaker 2 of the handset 23.
In addition to driving 3a, the audio signal output from the transmission microphone 23b of the handset 23 is given to the extension interface 12-1.

The input / output interface 24 is connected to the extension interface 12-1 and inputs and outputs data exchanged between the main unit 1 and the key telephone 2-1. The dial key 25 includes 12 keys to which numerical values “0” to “9” and “*” and “#” are assigned, respectively. It is for inputting information.

The function key group 26 includes a plurality of function keys. Each of these function keys is assigned a function such as an extension call designation, an outside line capture, or a capture of a previously designated office line, and is used by the user to designate and input these functions to the telephone control unit 32. Things.

The LED group 27 includes a plurality of LEDs provided corresponding to each of the function keys of the function key group 26.
For displaying the use state of the function assigned to the corresponding function key.

The LED drive circuit 28 includes a telephone control unit 32
Is driven under the control of the LED group 27. The LCD 29 is for displaying various information to the user. The LCD drive circuit 30 drives the LCD 29 under the control of the telephone control unit 32. The memory 31 stores various kinds of information necessary for the telephone controller 32 to perform various kinds of processing. The telephone control unit 32 is mainly composed of, for example, a microcomputer, and performs general control of each unit of the key telephone 2-1. In addition, other key telephone 2
As (2-2 to 2-m), one having the same configuration as the key telephone 2-1 is connected. Next, the operation of the key telephone system configured as described above will be described. FIG. 3-
FIG. 6 is a flowchart showing the control process. First, an off-hook operation is performed on the key telephone 2-1 at the request of the user (FIG. 3, step 3a). Here, the off-hook operation is performed by pressing a corresponding function key in a key telephone system having an on-hook dial function in addition to a normal handset pick-up operation.

Thereafter, when an extension transmission operation is performed on the key telephone 2 (step 3b), the flow shifts to step 4a shown in FIG. This extension calling operation is performed, for example, by pressing “0” of the dial key 25 or by pressing the function key group 26.
This operation is performed by an operation such as pressing an extension transmission button provided in the terminal.

The system which has proceeded to step 4a generates a tone (extension tone: for example, a 0.5-second intermittent tone) indicating that it is in an extension transmission state at this step, and transmits the extension to the user through the receiving speaker 23a. Notify that it is in status. In response to this, the user enters dial key 2
5 is operated to input a calling telephone number as selection information (step 4b).

In response, the system determines whether or not the input calling telephone number is a predetermined emergency calling number (step 4c). This determination is performed by the determination unit 17a.
It is performed by The emergency calling number may be set to a number such as 110/119 in Japan or 911 in the United States, and is stored in the memory 16 in advance by a user's key input operation.

If it is determined that the number is not an emergency calling number, the process proceeds to step 4d, where normal extension line connection control is performed. On the other hand, if it is determined that the number is an emergency call number, the process proceeds to step 4e, where connection control to the dedicated line 4 is performed. This connection control is performed by the communication link forming unit 17b, and includes acquisition of the dedicated line 4 and loop-on for establishing a communication link through the dedicated line 4.

Thereafter, the process proceeds to step 4f, where the transmission of the identification information (ID) uniquely assigned to the key telephone 2-1 which has performed the emergency call operation is performed via the dedicated line 4. As this ID, for example, the telephone number (dial-in number) of the key telephone set 2-1 is used and transmitted as a DTMF signal. More specifically, information corresponding to the telephone number is stored in the memory 16 in advance by, for example, a key input operation of the user, and the information is extracted under the control of the main control unit 17. Then, the DTMF generation circuit 19 generates a D corresponding to this information (that is, a telephone number).
A TMF signal (PCM signal) is generated and sent out by the dedicated line interface 14 as a DTMF tone (analog signal). Thereafter, the process proceeds to step 4g, and communication with the monitoring center via the dedicated line 4 is performed as necessary.

Note that some other types of button telephone systems automatically enter an extension transmission state by an off-hook operation. In this case, the procedure directly proceeds from the off-hook operation to step 4a in FIG. The operation process is the same as above.

FIG. 7 shows a sequence diagram from the extension transmission operation. As described above, when the extension transmission operation (extension transmission button ON) is performed by the key telephone 2-1, the fact is detected by the extension interface 12-1 and notified to the main control unit 17. After that, after the user inputs the emergency call number (119), the main control unit 17 starts control of capturing the leased line 4, and the leased line interface 1
4, the dedicated line 4 is looped on. Thereafter, under the control of the main controller 17, the ID of the key telephone 2-1 is transmitted via the dedicated line interface 14 and the dedicated line 4.

FIG. 10 shows the LCD 2 in the above control process.
9 shows a change in the display content. In the idle state (10a), for example, the date of the day, the number (No. 205) assigned to the key telephone 2-1 and the like are displayed.

When an off-hook operation is performed from this state, a blank display state (10b) is first set, and then, when the extension button is pressed, a message prompting a number input is displayed (10c). Next, the input numbers are displayed one after another (10d), and the emergency calling number (911) is displayed.
When is pressed, the dedicated line (called the "CAMA LINE" in the United States and used to identify the installation position of the telephone) is immediately captured and displayed.

On the other hand, when an outside line transmission operation is performed on the key telephone 2 (FIG. 3, step 3c), the flow shifts to step 5a shown in FIG. This outside line transmission operation is performed by an operation such as pressing an outside line transmission button provided in the function key group 26, for example.

The system which has proceeded to step 5a performs ordinary outside line capture control in this step. In this step, an off-hook signal is transmitted to the network, followed by an outside line capturing operation, and generation of a tone (so-called dial tone) at the receiving speaker 23a indicating that an outside line is being transmitted.

Upon receiving the dial tone, the user operates dial key 25 to input a dial phone number as selection information (step 5b). In response, the system determines whether or not the input calling telephone number is a predetermined emergency calling number (step 5c). This determination is performed by the determination unit 17a.

If it is determined that the number is not an emergency calling number, the process proceeds to step 5d, and ordinary outside line connection control is performed. On the other hand, when it is determined that the number is an emergency call number, the process proceeds to step 5e, and the outside line captured in step 5a is disconnected. Next, at step 5f, connection control to the dedicated line 4 is performed as in step 4e of FIG. The control performed in these steps 5e and 5f is performed by the communication link forming unit 17b, and the subsequent steps 5g and 5h are the same as steps 4f and 4g in FIG.

FIG. 8 shows a sequence diagram from the outside line transmission operation. As shown in FIG. 8, when an outside line transmission operation (external line transmission button ON) is performed on the key telephone 2-1.
This is first detected by the extension interface 12-1 and notified to the main control unit 17. Next, the main controller 17
Sends an external line capture instruction to the external line interface 13 to cause the external line 3 to loop on.

Thereafter, the user sets the emergency call number (11
When 9) is input, the main controller 17 issues an external line off (open) instruction to the external line interface 13, and the external line 3 once captured is looped off. After the completion of the loop-off, the acquisition control of the leased line 4 is started, and the leased line 4 is looped on by the leased line interface 14. Thereafter, under the control of the main controller 17, the ID of the key telephone 2-1 is transmitted via the dedicated line interface 14 and the dedicated line 4.

FIG. 11 shows the LCD 2 in the above control process.
9 shows a change in the display content. When an off-hook operation is performed from the idle state 11a, first, a blank display state (1
1b), and when the outside line button is pressed, a number (LINE5) of the captured outside line and a message prompting the input of the number are displayed (11c). Next, the input numbers are displayed one after another (11d), and when the emergency call number (911) is pressed, CAMA is immediately performed.
The LINE is captured and displayed to that effect.

Further, in the case where direct key input is performed in the state where neither the extension transmission operation nor the outside line transmission operation is performed on the key telephone 2 (FIG. 3, step 3d), the system proceeds to step 3e. Then, it is determined whether or not the input calling telephone number is a predetermined emergency calling number. This determination is performed by the determination unit 17a. In addition, as an example of step 3d, for example, in a public telephone system, there is a case where a dial operation is performed without inputting a charge despite the fact that the receiver is in an up state.

If it is determined that the number is not an emergency calling number, the process returns to step 3b to repeat the above-described process. On the other hand, if it is determined that the number is an emergency call number, the system proceeds to step 6a in FIG. 6, in which connection control to the dedicated line 4 is performed. This connection control is performed by the communication link forming unit 17b as in step 4e in FIG. 4, and the subsequent steps 6b and 6c are the same as steps 4f and 4g in FIG.

FIG. 9 shows a sequence diagram from the off-hook operation. As shown in FIG.
When an off-hook operation is performed in step 1, the fact is detected by the extension interface 12-1 and the main control unit 17 is notified. Thereafter, the user issues an emergency call number (119).
Is input, the control of the exclusive line 4 is started by the main control unit 17, and the exclusive line 4 is looped on by the exclusive line interface 14. Thereafter, under the control of the main controller 17, the ID of the key telephone 2-1 is transmitted via the dedicated line interface 14 and the dedicated line 4.

FIG. 12 shows the LCD 2 in the above control process.
9 shows a change in the display content. When an off-hook operation is performed from the idle state 12a, the display enters the blank display state 12b, and waits for a number input. Here, the blank display state is maintained even if a number is input (12c), and only when the emergency call number (911) is pressed is CAMAL.
The INE is captured and displayed to that effect.

Thus, according to the present embodiment, key input can be performed in any of the following states: the extension calling state, the outside line calling state, or the state where only the off-hook operation is performed. In this case, the system automatically captures the dedicated line and automatically sends the ID to the monitoring center via the dedicated line. For this reason,
It is not necessary to use a telephone number assigned to each dedicated line, and the trouble of inputting an ID in an emergency can be saved. The emergency calling number can be freely set according to the user's convenience, but is preferably set to a universal number such as 110/119 by public agreement.
By doing so, it is possible to perform an emergency call by a common operation among users without being bound by a difference in operation method for each system.

The present invention is not limited to the above embodiment. For example, in the present embodiment, the case where the ID as the identification information is transmitted to the monitoring center as the DTMF signal which is an audio (analog) signal has been described, but it is not necessarily limited to this example. For example, digital data corresponding to the ID may be stored in the memory 16 and transmitted in an emergency through a digital line. By doing so, the ID can be sent more quickly, and the ID as text data can be displayed on the monitor at the monitoring center.

Further, in this embodiment, a number such as 110/119 is input by dial key operation in the case of emergency call, but a button dedicated to emergency call is provided in the function key group 26, and this button is pressed. As a result, the dedicated line may be automatically captured, and the ID may be transmitted. By doing so, it becomes possible to transmit the ID with a simpler operation.

When a telephone having a character input function is used as the key telephone 2, it is not always necessary to input a number as an emergency calling number. For example, text data corresponding to a specific destination (police or the like) may be transmitted. You may input it.

In the present embodiment, the ID number is
Is stored in the memory 16 provided in the key telephone 2, but may be stored in the memory 31 of the key telephone 2. Further, in the present embodiment, the case where the key input is performed after the off-hook operation has been described, but the off-hook operation is not necessarily required. That is, it is of course possible that the system accepts only the emergency calling number without an off-hook operation. This eliminates the need for an operation of picking up the receiver, and in particular, applying the present invention to a public telephone system eliminates the necessity of charging a fee, so that the ID can be transmitted by a quick operation, which is particularly effective in an emergency. In addition, various modifications can be made without departing from the spirit of the present invention.

[0055]

As described in detail above, the present invention relates to a key telephone apparatus comprising a plurality of key telephones and a main unit which accommodates each of the key telephones in an extension and which is connected to a central office line and a dedicated line. In the system, storage means for storing identification information, determination means for making a determination on the selection information of the call destination input in the key telephone,
Communication link forming means, and identification information transmitting means for transmitting the identification information, storage means storing identification information given to each of the key telephones or each group, and determining means for the key telephones Then, it is determined whether or not the selection information of the transmission destination input in step 1 corresponds to a predetermined transmission destination.
If the communication link forming means determines that the selection information of the call destination does not correspond to the predetermined call destination by the determination means, a communication link is formed via the line being captured, On the other hand, if it is determined that they correspond, the dedicated line is newly acquired to form a communication link with the predetermined destination. Then, when the communication link forming means forms a communication link with the predetermined destination, the identification information sending means reads the identification information of the key telephone of the caller from the storage means, and Since the identification information is transmitted to the destination via the communication link, according to the present invention, it is possible to input a common transmission number among users regardless of the telephone number assigned to each dedicated line. Thus, the system can automatically capture a dedicated line and automatically transmit identification information such as an ID number assigned to each terminal through the dedicated line.

Further, the present invention provides the communication link forming means, when it is determined that the selection information of the transmission destination corresponds to a predetermined transmission destination, and when the line being captured is an extension, Since the extension currently being acquired is released and the exclusive line is newly acquired to form a communication link with the predetermined destination, the user who does not know detailed operation procedures for the terminal is required. However, it is possible to make an appropriate emergency call simply by performing an extension call operation.

Further, the present invention provides the communication link forming means, when it is determined that the selection information of the transmission destination corresponds to a predetermined transmission destination, and when the line being captured is an outside line, Since the outside line being acquired is released and the exclusive line is newly acquired to form a communication link with the predetermined destination, a user who does not know detailed operation procedures of the terminal is required. However, it is possible to perform an appropriate emergency call only by performing an outside line call operation.

Further, the present invention provides the communication link forming means, wherein when the selection information of the destination is determined to correspond to a predetermined destination, the key telephone of the source is in an off-hook state. If no line has been acquired yet, the dedicated line is acquired to form a communication link with the predetermined destination, so that detailed operation procedures for the terminal are not known. Even a user can make an appropriate emergency call simply by performing an off-hook operation.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a system to which a key telephone system according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing the configuration of the key telephone system according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a state of a processing start stage of the key telephone system according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a processing procedure when an extension calling operation is performed in the key telephone system according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a processing procedure when an outside line transmission operation is performed in the key telephone system according to the embodiment of the present invention.

FIG. 6 is a flowchart showing a processing procedure when a key input is performed in the key telephone system according to the embodiment of the present invention in a state where an extension calling operation and an outside line calling operation are not performed.

FIG. 7 is a diagram showing a sequence from an extension transmission operation in the embodiment of the present invention.

FIG. 8 is a diagram showing a sequence from an outside line transmission operation in the embodiment of the present invention.

FIG. 9 is a diagram showing a sequence from an off-hook operation in the embodiment of the present invention.

FIG. 10 is a diagram showing an example of a change in display content of the LCD 29 during an extension transmission operation sequence in the embodiment of the present invention.

FIG. 11 is a diagram showing an example of a change in display content of the LCD 29 during an outside line transmission operation sequence according to the embodiment of the present invention.

FIG. 12 is a diagram showing an example of a change in the display content of the LCD 29 during an off-hook operation sequence in the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Main apparatus 2 (2-1 to 2-m) ... Key telephone 3 ... Office line 4 ... Dedicated line 10 ... Time switch 11 ... Timing generation circuit 12 (12-1 to 12-m) ... Extension interface 13 ... Station Line interface 14 Dedicated line interface 15 Sub-control unit 16 Memory 17 Main control unit 17a Judgment unit 17b Communication link forming unit 17c Identification information transmission unit 18 Data highway 19 DTMF generation circuit 20 Bus 21 PCM highway 22 ... Call circuit 23 ... Handset 24 ... Input / output interface 25 ... Dial key 26 ... Function key group 27 ... LED group 28 ... LED drive circuit 29 ... LCD 30 ... LCD drive circuit 31 ... Memory 32 ... Phone control unit 33 ... bus

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K024 AA02 AA11 AA79 BB04 CC04 DD01 DD05 EE01 GG01 GG03 5K027 AA03 BB02 CC06 EE04 HH00 HH23 5K049 AA17 BB05 BB17 BB21 CC03 CC05 CC08 CC11 EE01 FF11 NN15 FF15 PP03 RR12 TT01 9A001 JJ12 KK56

Claims (4)

[Claims] 1. A key telephone system comprising: a plurality of key telephones; and a main unit accommodated in each extension and connected to a central office line and a dedicated line. Storage means for storing identification information given for each call, and for judging whether or not the selection information of the call destination inputted in the key telephone corresponds to a predetermined call destination If it is determined by the determination means that the selection information of the transmission destination does not correspond to the predetermined transmission destination, a communication link is formed via the line being captured, and If determined, the communication line forming means for newly capturing the dedicated line and forming a communication link with the predetermined destination, When a communication link is formed with the predetermined destination by the link forming means, the identification information of the key telephone of the transmission source is read out from the storage means, and the identification information is read through the communication link. A key telephone system comprising: identification information transmitting means for transmitting to a transmission destination. 2. The communication link forming means, when it is determined that the selection information of the transmission destination corresponds to a predetermined transmission destination, and when the line being captured is an extension, 2. The key telephone system according to claim 1, wherein an extension is released and the exclusive line is newly acquired to form a communication link with the predetermined destination. 3. The communication link forming means, when it is determined that the selection information of the transmission destination corresponds to a predetermined transmission destination, and when the line being captured is an outside line, 2. The key telephone system according to claim 1, wherein an outside line is released and the exclusive line is newly acquired to form a communication link with the predetermined destination. 4. The communication link forming means, when it is determined that the callee's selection information corresponds to a predetermined callee, even if the caller's key telephone is in an off-hook state, 2. The key telephone system according to claim 1, wherein when no line is captured, the dedicated line is captured to form a communication link with the predetermined destination.