JPH07112218B2 - Button telephone and telephone communication device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone communication device configured by connecting a button telephone and the like to a button telephone and an electronic exchange.

2. Description of the Related Art Conventionally, in a hybrid type electronic private branch exchange capable of using both a button telephone, an ordinary standard type single telephone, an answering machine, and a facsimile machine (hereinafter referred to as general terminal equipment), it is possible to determine whether or not a DC loop current exists. It has both a function to operate and a function to determine the on / off hook state of the key telephone by the signal sent from the data communication line. Then, by inserting an interface card of either the key telephone or the general terminal device into the electronic exchange, it is determined whether the key telephone or the general terminal device is connected to each extension. In the exchange configured as described above, the extension set for the key telephone is used to discriminate between the on-hook state and the off-hook state by the signal sent from the data communication line. Further, in the extension set to use the general terminal device, the on-hook state and the off-hook state are discriminated by the presence or absence of the DC loop current.

By the way, in such a hybrid type exchange, one extension telephone may be connected to one extension telephone, and general terminal devices such as an answering machine and a facsimile may be connected in parallel to a communication line of the same extension. . Since the key telephone and the general terminal device have the same extension number, when the user accidentally lifts the handset of the key telephone when data is being transferred to the facsimile when the facsimile or the like is connected as the general terminal device, In some cases, the impedance of the communication line looking out from the exchange side may be significantly reduced, and the signal level of the communication line may be reduced, so that data may not be successfully transferred to the facsimile.

Therefore, in order to connect the general terminal device in parallel with the key telephone without causing such a decrease in the signal level of the communication line, a changeover switch for switching and connecting the communication line to the key telephone or the general terminal device is provided. It is possible to provide it.

Problems to be Solved by the Invention However, in the above configuration, once a call from the outside line is received by the key telephone, the communication line from the exchange is connected to the attached subscriber line in the key telephone to connect to the general terminal. When communication is being performed by a general terminal, even if the general terminal self-communication is completed and the general terminal becomes self-open, the exchange cannot recognize that fact. Can not immediately disconnect the line,
The switch unnecessarily puts the extension in the closed state until the key telephone, which is the master device, is put into the on-hook state by the user's hand and the on-hook data to that effect is sent to the switch side. Was there.

The present invention has been made in view of the above problems, and even when both a key telephone and a general terminal are connected to one extension of an exchange, a line open state continues unnecessarily. The present invention relates to a key telephone that does not cause inconvenience and a telephone communication device configured by connecting the key telephone to an exchange.

Means for Solving the Problems In order to solve the above problems, in the present invention, in a key telephone, a connecting means for connecting an attached subscriber line connected to a general terminal device, a call line from an exchange and a call First switching means for connecting and disconnecting the circuit portion, and second switching means for connecting and disconnecting the attached subscriber line to which the general terminal device is connected and the above-mentioned communication line from the exchange. , A switch for switching to a mode in which the button telephone itself can be manually used from the outside and a mode in which the connected general terminal device can be used, and the exchange side is provided each time the mode is switched by the switch. The signal indicating the mode at that time is transmitted through the data communication line.

On the other hand, on the exchange side, the above signals sent from the key telephone are constantly monitored, and when controlling the line connection and disconnection, etc., whether to follow the monitoring output from the DC loop monitoring unit based on the above signals. Also, it is configured to determine whether to follow the signal indicating on-hook / off-hook sent from the key telephone through the data communication line.

With the above configuration, while the key telephone is in use, the signal indicating the mode in which the key telephone can be used is always sent to the exchange side, while the general terminal device different from the above signal can be used while the general terminal device is in use. Based on these signals, the exchange performs control such as line connection and disconnection according to the on-hook / off-hook signal sent through the data communication line based on these signals. While the terminal device is in use, the above control can be performed according to the monitor output from the DC loop monitor.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, a general configuration of an electronic private branch exchange (hereinafter referred to as an electronic exchange) for constructing a telephone communication device according to the present invention will be described, and subsequently, a general configuration of a button telephone according to the present invention will also be described. .

FIG. 1 is a block diagram when a key telephone is connected to the electronic exchange and a general terminal device is connected to the key telephone in this embodiment. 100 is an electronic exchange. The electronic exchange 100 is capable of accommodating a key telephone as an extension terminal, and in one extension, a subscriber line for voice signal transmission and a data communication line for transmitting command and response signals and the like are provided. In the provided electronic exchange 100, 107 is a subscriber line 202
DC loop monitoring unit for monitoring the DC loop current and pulse dial signal of 108, 108 is a bell signal generating unit for sending a bell signal to the subscriber line 202, and 105 is for supplying the DC loop current to the subscriber line 202 and in the voice band. This is a subscriber circuit unit that performs the connection of. 109 is a DC loop monitoring unit 107 and a subscriber circuit unit
Connection with 105 and DC loop monitor 107 and bell signal generator
It is a relay contact that switches the connection with 108.
Is a terminal of the subscriber circuit unit 105, and b is a terminal of the bell signal generation unit 108.

A data communication unit 102 is connected to the data communication line 201 and performs data communication with the key telephone 300.

The DC loop monitoring unit 107 and the bell signal generating unit 1 described above
08, the subscriber circuit unit 105, and the data communication unit 102 constitute a subscriber interface unit 110.

Reference numeral 103 is a station line trunk portion which is connected to a station line 204 from an external exchange and electrically interfaces with the station line 204. Reference numeral 104 denotes a speech path unit for switching connection between a plurality of extension lines and an outside line, and a subscriber circuit unit 105 and a station line trunk unit 103 provided for each of the plurality of extension lines connect in a voice band. Be done. 106 is a DTMF receiver, and DTMF receiver 1
06 is connected to the communication path unit 104 together with the office line trunk unit 103 and the subscriber circuit unit 105. That is, the call path unit 104 can be connected to the subscriber circuit unit 105, and when the extension is connected to the general terminal device together with the button telephone, the general terminal device is connected via the subscriber line 202. The multi-frequency selection signal transmitted by the DC loop monitoring unit 10
7. Can be received through the subscriber circuit unit 105.

101 receives information from the data communication unit 102, DTMF receiving unit 106 and other devices, controls relays in the subscriber interface unit 110, and also provides a communication path unit 104 and a trunk line trunk unit 103.
It is a control unit that controls the above.

Next, the configuration of the key telephone 300 in this embodiment will be described. 302 is a data communication unit for exchanging signals with the electronic exchange 100 through the data communication line 201; 303 is a ring tone transmission to the user, and a lamp display during reception, a lamp display during use, a lamp display during other end unused Display section for
304 is an operation unit provided with a dial button, an outside line selection button, other function buttons for controlling the functions of the electronic exchange 100, and 305 is a call circuit unit that enables a voice call with the handset 306. Reference numeral 307 is a relay contact for connecting the subscriber line 202 and the call circuit unit 305.

The key telephone 300 in the present embodiment is provided with a modular jack so that a general terminal device such as a facsimile can be connected and used, and an attached subscriber line connected to the general terminal device is connected to the modular jack. You can connect to. Reference numeral 308 is a relay contact for connecting the subscriber line 202 and the attached subscriber line.

Reference numeral 309 denotes a switching button for externally setting either a mode in which the electronic exchange 100 itself can be used or a mode in which a general terminal device connected to the modular jack can be used. 301 receives an input from the operation unit 304, monitors the state of the switching button 309, and controls the data input / output with the data communication unit 302 based on the information, the control of the display unit 303, the communication circuit unit 305. The control unit controls and controls the relay contact 307, the relay contact 308, and the like.

The operation of the electronic exchange of this embodiment configured as described above will be described below according to the control procedure in the control unit 101. 2 to 4 are flowcharts showing the control procedure in the electronic exchange 100, which will be described with reference to these flowcharts.

In step 501, it is judged whether or not there is an incoming call in the electronic exchange 100. If there is no incoming call, the process proceeds to the next step as it is, and in step 502, the selection information of the switching button is judged. If there is an incoming call, the process proceeds to step 541 (shown in FIG. 4).

If the key telephone set 300 is selected in step 502, the process proceeds to step 503, and it is determined whether the off-hook data is received from the key telephone set 300. Conversely, if the general terminal device 401 is selected, the process proceeds to step 520, and the direct current By the input from the loop monitoring unit 107, it is determined whether or not the general terminal device 401 is in the off-hook state and the DC loop of the subscriber line 202 is closed. If it is determined in step 503 that the off-hook data has not been received, the process returns to step 501 and the same processing as described above is performed. On the other hand, if it is determined in step 520 that the DC loop has not been closed, the process returns to step 501 and the same processing as described above is performed. The electronic exchange normally waits for an incoming call from an outside line and an outgoing call from an extension terminal while repeating the above determination routine.

The case where a call is made from the key telephone will be described below. When it is determined in step 503 that the off-hook data has been received, in the next step 504, response data indicating that the off-hook data has been recognized is transmitted to the key telephone 300 via the data communication line 201. Then in step 505,
In the control unit 101 of the electronic exchange 100, preparation is made to receive and input dial data sent from the key telephone set 300.
Then, while repeating the determination routine including step 506, step 507, and step 508, it waits for dial data from the key telephone 300. The details will be described below.

In step 506, the electronic exchange 100 checks the information of the switching button again, and if the key telephone set 300 is still selected, the process directly proceeds to step 507. Step 507
Then, it is determined whether or not the on-hook data is transmitted from the key telephone 300, that is, it is determined whether or not the call is abandoned by the on-hook during dialing of the key telephone. If the information of the switching button in step 506 is for selecting the general terminal device 401, it means that the switching button of the key telephone 300 was operated during dialing, and in that case, from this determination routine. If it goes off, the process proceeds to step 524 (shown in FIG. 3) for the general terminal device 401 to detect the DC loop open of the subscriber line 202.
By the way, when it is determined in step 507 that the on-hook data is received from the key telephone 300,
It is regarded as abandonment of dialing and the process proceeds to step 514, and the response data indicating that the on-hook data has been recognized is sent to the button telephone
The data is sent to 300, and the process ends. If it is confirmed in step 507 that the on-hook data has not been received, the process proceeds to the next step 508, and it is determined whether the dial data transmitted from the key telephone has been received. If it has not been confirmed, the process returns to step 506. Then, the dial data reception confirmation waiting state is entered, and steps 506, 507, 508, 506 ...
The judgment step is repeated.

Next, the steps up to the connection with the called party will be described in detail. When the reception of the dial data is confirmed in step 508, the electronic exchange 100 starts calling the other party according to the content of the dial data confirmed to be received in the next step 510. Then, in the next step 511, the information of the switching button is again discriminated, that is, it is discriminated whether or not the switching of the subscriber line connecting device has been performed by the operation of the switching button during the calling of the other party, and the general terminal device 401 is switched there. If so, the process proceeds to step 529 (shown in FIG. 3) for the general terminal device 401, and it is determined whether or not the calling of the other party is abandoned by opening the DC loop of the subscriber line 202. Step
If the key telephone set 300 is still selected at 511, the process proceeds to the next step 512, in the same manner as described above, it is determined whether or not the call destination of the other party is abandoned by the on-hook of the key telephone set 300, and the on-hook data is received. If it turns out that it is abandoned dialing as in the case above,
The process proceeds to step 514, the response data indicating that the on-hook data is recognized is sent to the key telephone set 300, and the process is ended. If it is confirmed in step 512 that the on-hook data has not been received, it is considered that there is an intention to continue calling the other party, and the process directly proceeds to step 513. In step 513, it is determined whether or not the other party has responded. If there is no response from the other party, the above step 510
Then, the other party's call response waiting state continues while repeating step 510, step 511, step 512, step 513, step 510 ,. When the response of the other party is found in step 513, the process proceeds to step 550 (shown in FIG. 4), and the control unit 101 of the electronic exchange 100 controls the call path unit 104 to establish a connection with the other party. , It becomes possible to talk with the other party.

Next, a case will be described where the general terminal device 401 is selected by the switch button and a call is made from the general terminal device 401. When it is determined in step 501 that the incoming call is not received, and when the selection of the general terminal device 401 is determined by the switching button information determination in the next step 502, the following processing is performed. That is, in step 520, subscriber line 2
Subscriber line 2 of general terminal device 401 by closing the DC loop of 02
02 Capture determination is performed, and if the DC loop is not closed yet, the process returns to step 501. Then, until the DC loop is closed, step 501, step 502, step
520, step 501 ... are repeated. General terminal device 401
When the DC loop is closed by, for example, shifting to the off-hook state, the process proceeds to the next step 521. Step 5
At 21, the general terminal device 401 sends to the key telephone 300 response data indicating that the subscriber line 202 has been captured. Next, the control unit 101 controls each unit to prepare to receive a dial signal, that is, the DC loop monitoring unit 107 signal is received for the pulse dial signal from the general terminal device 401, and the DTMF reception is received for the DTMF signal. The unit 106 is connected to prepare for reception.

Next, while continuing to receive the dial signal, step 523,
Judgment routine consisting of steps 524 and 525 (3rd
(Shown in the figure) is repeated to wait for confirmation of the dial signal sent from the general terminal device 401. The outline of this part is similar to the case of the dial signal confirmation waiting state in the case of the key telephone 300 described above. First, in step 523, the switching button information is confirmed again, and it is determined that the key telephone 300 is selected. The routine is exited and the process proceeds to step 507 (shown in FIG. 2). If it is confirmed in step 523 that the general terminal device 401 remains selected, step 524
Then, it is determined whether or not the DC loop of the general terminal device 401 is open. When the DC loop opening of the general terminal device 401 is detected in step 524, the general terminal device 401 recognizes that the dial transmission is abandoned, and proceeds to step 531 to indicate that the general terminal device 401 has opened the subscriber line 202. The response data is sent to the key telephone 300, and the process ends. If it is confirmed in step 524 that the DC loop is still closed, the process proceeds to the next step 525 and the dial signal confirmation determination is performed. The dial signal from the general terminal device 401 is sent in the form of a pulse dial signal or a DTMF signal, and it takes some time until all the signals are sent. If not yet determined in step 525, it will return to step 523, until all signals are sent from the general terminal device 401 and the dial signal identifying the calling party is determined,
Step 523, Step 524, Step 525, Step 523
... and so on, and the dial signal confirmation waiting state continues.

Next, the calling operation will be described. When the dial signal from the general terminal device 401 is confirmed in the above-described waiting state for confirming the dial signal, the process proceeds to the next step 527, and the electronic exchange starts calling the destination of the confirmed dial number. Then, as in the case of the above-mentioned waiting state for confirming the dial signal, the information of the switching button is confirmed again (step 528), and the confirmation of the DC loop is performed at step 529 to call the other party by on-hook of the general terminal device 401 being called. Determine the abandonment. If the key telephone set 300 is selected in step 528, the above-mentioned step 512 (second
(Shown in the figure). When it is determined in step 529 that the DC loop has been opened, the process proceeds to step 531 as in the case described above, and the general terminal device 401 sends response data indicating that the subscriber line 202 has been opened to the key telephone 300, and the process To finish. Confirm the selection of the general terminal device 401 in step 528, and confirm the DC loop closure in step 529,
Then, the process proceeds to next Step 530. In step 530, the other party's response is determined, and if there is no other party's response, the above-mentioned steps are performed.
Return to 527. Then, the other party's response waiting state continues while repeating step 527, step 528, step 529, step 530, step 527 ... When the response of the other party is found in step 530, step 550
The process proceeds to (shown in FIG. 4), and the control unit 101 of the electronic exchange 100.
Controls the call path unit 104 to establish a connection with the other party and establish a call with the other party.

Next, a call state (including data communication for exchanging data in a code format and image signal communication in the case of facsimile) will be described. During the call state, the information of the switching button is always discriminated, and if the key telephone 300 is selected, the process proceeds to the next step 552, the on-hook data from the key telephone 300 is confirmed, and the key telephone 3
00 Distinguishes the end of the call by on-hook. On the other hand, if the general terminal device 401 is selected, it is determined in step 554 that the DC loop of the subscriber line 202 is open. If the on-hook data is not received in step 552, the end-call detection is continued by returning to step 551. On the other hand, when the on-hook data is received in step 552, the process proceeds to step 553, and the on-hook data is recognized to the key telephone 300. The response data to that effect is transmitted. Further, when the general terminal device 401 is selected, if the DC loop of the subscriber line 202 is not opened in step 554, the process returns to step 551 to continue detection of the call end during the call, while in step 554 the DC When the opening of the loop is detected, the process proceeds to step 555, and the response data indicating that the termination due to the opening of the DC loop of the subscriber line 202 to which the general terminal device 401 is connected is transmitted to the key telephone 300. After sending the response data in step 553 or step 555, the control unit 101 of the electronic exchange 100 controls the call path unit 104 in step 556, disconnects the line, and ends the process.

Next, the incoming call processing when an incoming call is received from an outside line will be described. When it is determined in step 501 (shown in FIG. 2) that an incoming call signal is sent from the outside line, the incoming call processing routine (shown in FIG. 4) is started. In this case, first, step 501 (shown in FIG. 2) to step 541 (fourth)
(Shown in the figure), and the information of the switching button is determined. The switching button in the button telephone 300 is the general terminal device 401.
If you are in the state to select, first step 545
Then, the incoming data indicating that the general terminal device 401 is currently receiving an incoming call is sent to the key telephone 300. Then, in step 546, the bell signal transmission to the subscriber line 202 is started.

The bell signal is transmitted as follows. That is, the relay 109 in the electronic exchange 100 is connected to the b side, and the bell signal generating unit 108 relays the relay 109, the DC loop monitoring unit 107, and the subscriber line 2.
A bell signal is transmitted to the general terminal device 401 via 02. Normally, the contacts of the relay 109 are alternately connected to the a side and the b side in a cycle of 2 to 3 seconds, and when connected to the a side, the DC loop current can be detected. However, in some cases, the contact of the relay is connected to the side of the bell signal source, and the DC loop current flowing superimposed on the AC current is detected while the AC bell signal is being sent to the subscriber line.

In the button telephone 300, the switching button is the general terminal device 401.
If it is in the state of selecting, the relay 308 should have fallen to the side of the attached subscriber line 203, and the bell signal sent via the subscriber line 202 is directly sent to the attached subscriber line 203. It will be.

After the start of the bell signal transmission, in step 547, the DC loop closure is determined based on the detection output from the DC loop monitoring circuit 107. If the DC loop is not closed there, the process returns to step 541 and steps 541 and 54.
5, step 546, step 547, step 541 and so on are repeated, and the incoming call waiting state for the general terminal device 401 continues.

When it is determined in step 547 that the DC loop is closed, the general terminal device 401 recognizes that it has entered the on-hook state or the like and has captured the subscriber line 202, and proceeds to the next step 548 to join the general terminal device 401. Response data indicating that the private line 202 has been captured is sent to the key telephone 300. Then, in the next step 550, the connection process with the other party is performed, and the call becomes possible.

On the other hand, when it is determined in step 541 that the key telephone set 300 is selected, the process proceeds to step 542, the incoming call data indicating that the incoming call is being made is transmitted to the key telephone set 300, and the button is pressed in step 543. An incoming call response is determined by off-hook of the telephone 300. In step 543, if the key telephone set 300 remains on-hook, the process returns to step 541 and repeats step 541, step 542, step 543, step 541, and so on, and the incoming call waiting state for the key telephone set 300 continues. .

Then, when the off-hook data is received from the key telephone 300 and it is found that the off-hook data is received in step 543, the process proceeds to the next step 544, and the response data indicating that the off-hook is recognized is sent to the key telephone 300. Then, the processing shifts to step 550 described above, and the call partner is connected to be in the call enabled state. Subsequent processing such as switching button information determination and call termination determination in the call state is the same as that in the call state after dialing as described above.

The above is the processing procedure of the electronic exchange 100.
Repeats the above processing for each extension and performs various processing such as monitoring the state of each extension and making and receiving calls.

Next, an internal processing procedure of the key telephone according to the present embodiment will be described with reference to the flowcharts of FIGS. 5 and 6.

In FIG. 5, step 601 is a subroutine for discriminating the push of the switching button, which is shown in FIG. First 6th
A subroutine for discriminating the pressing of the switching button will be described with reference to the drawing. In step 701, it is determined whether or not the switching button 309 has been pressed, and if it has not been pressed, the process directly returns. If it is pressed, the process proceeds to the next step 702. In step 702, it is determined which mode is currently set, and if the setting up to that point is the key telephone mode, in step 703 the electronic exchange 100 is switched to the general terminal device mode. Sends button data and returns. If the setting up to that time is the general terminal device mode, the switching button data for switching to the key telephone mode is sent to the electronic exchange 100 in step 704 and the process is returned. Hereinafter, the processing shown in FIG. 6 will be referred to as a button press determination subroutine as described above.

In FIG. 5, the current mode is determined in step 602 after step 601 described above.
In step 603, it is determined whether or not incoming data indicating that the key telephone 300 is being received is being received. Step 60
If it is found that the call is being received in step 3, next step 604
Is executed to display on the display unit 303 that the key telephone 300 is receiving an incoming call, and if it is not receiving an incoming call, step 604 is not executed and the process proceeds to step 605. In step 605, relay
Both 307 and relay 308 are opened. The opening of the relay 308 makes it impossible for the general terminal device to seize the subscriber line 202. Next, in step 606, it is determined whether or not the handset 306 of the key telephone 300 is off-hook,
If it remains on-hook, the process returns to step 601, step 601, step 602, step 603, [step 604 only when receiving an incoming call], step 605, step 606, step 601.
... is repeated, and the off-hook waiting state for waiting for the off-hook for making a call and the off-hook for answering the incoming call continues. When the off-hook of the handset 306 is detected in step 606, the process proceeds to step 607 and the off-hook data is sent to the electronic exchange 100. In the next step 608, the reception of the response data indicating that the off-hook of the key telephone has been transmitted, which is transmitted from the electronic exchange 100, is waited for, and if not received, the response data is received and the next step 60
The display shifts to 9 and the display unit 303 displays that the button telephone itself is in use. Then, in the next step 610, the relay 307 is closed for the first time to put the button telephone 300 into the call state, while the relay 308 is kept open, and the button is pressed to the general terminal device 401 connected to the attached subscriber line 203. Keep the phone 300 secret. Next, in step 611, a button pressing discrimination subroutine is executed, and in step 612, the setting mode of the switching button is discriminated. On the other hand, if it is found in step 612 that the mode has been switched to the general terminal device mode, the process proceeds to step 625, which is incorporated in the processing when using the general terminal device. If no on-hook is detected in step 613, the process returns to step 609, and steps 609, 610, 611, 612, 613, 609 ...
The above will be repeated, and the on-hook waiting state continues during the telephone call of the button telephone 300. When the on-hook data is detected in step 613, the on-hook data is sent to the electronic exchange 100 in step 614, and the electronic exchange 10 is sent in step 615.
0 indicates a state of waiting for reception of response data indicating that the on-hook data has been recognized. When the response data is received in step 615, the process proceeds to step 616, and the subscriber line 202 is displayed on the display unit 303.
The relay 307
Is opened, while the relay 308 is closed to end the processing.

By the way, if it is in the general terminal device mode in the state of step 602, the process proceeds to step 621.

In step 621, whether or not there is an incoming call to the general terminal device 401 at present and the call signal is being sent to the general terminal device 401 is determined based on the incoming data. The general terminal device 401 is receiving a call, that is, the general terminal device 401
If it is found that there is an incoming call in the above state, the following step 622 is executed, a message indicating that the general terminal device 401 is receiving an incoming call is displayed on the display unit 303, and the incoming call is being received. If not, step 622 is not executed and step 623 is entered. In step 623, the relay 307 is opened to disable the incoming and outgoing call from the key telephone 300, while the relay 308 is closed to enable the subscriber line capture by the outgoing and incoming call of the general terminal device 401.

Next, in step 624, it is sent from the electronic exchange 100.
The general terminal device 401 determines whether there is response data indicating that the DC loop of the subscriber line 202 has been closed. When there is no response data in step 624, the process returns to step 601, and steps 601, 602, 621, [step 622 only when receiving an incoming call], step 623, step 624, step 601.
The general terminal device 40
The off-hook waiting state for waiting for the off-hook when making a call for 1 and the off-hook for answering the incoming call continues. When the response data is received in step 624, the process proceeds to step 625, and the general terminal device 401 causes the subscriber line 202 to the display unit 303.
Is displayed, the relay 307 is opened and the relay 308 is closed in step 626. In this state, it is the general terminal device 401, and the key telephone 300 causes the subscriber line 2
The use of 02 is impossible, and the secret story of the general terminal device 401 is kept. Further, in step 627, a button press discrimination subroutine is executed, and in step 628, mode switching discrimination is performed when the general terminal device 401 is talking. If it is determined in step 628 that the key telephone mode has been switched to, the processing shifts to the case of using the key telephone (step 609), and the on-hook discrimination waiting state in the key telephone mode is set. On the other hand, if it is the general terminal device mode in step 628, the process proceeds to step 629 as it is, and whether or not the general terminal device 401 sent from the key telephone 100 has received the response data indicating that the direct current loop of the subscriber line 202 is opened. If there is no response data, the process returns to step 625. Then, until the response data is confirmed, step 625, step 626, step 627, step 628, step 629, step 625.
.. Repeatedly, the general terminal device 401 keeps waiting for a DC loop open during a call. When the response data is received in step 629, the process proceeds to step 616, and the display indicating that the subscriber line 202 is not in use is displayed on the display unit 303 of the key telephone 300 as in the case of using the key telephone. At the same time, the relay 307 is opened and the relay 308 is closed to end the processing. The key telephone 300 constantly repeats the above processing.

As described above, according to the present invention, in the key telephone, the call line from the exchange is connected to the attached subscriber line connected to the general terminal device or the internal call circuit unit according to the operation mode. A switching means is provided for switching between a mode in which the button telephone itself can be manually used from the outside and a mode in which the connected general terminal device can be manually operated from the outside, and each time the mode is switched by the above-mentioned switching switch, a switchboard is exchanged. It is configured to send a signal indicating the mode at that time to the side through the data communication line, while the exchange side constantly monitors the above signals sent from the key telephone to control the line connection and disconnection. To do this, follow the monitoring output from the DC loop monitoring unit based on the above signal, or connect the data communication line from the above button telephone. By being configured to determine whether to follow the on-hook / off-hook signal sent through the exchange, the exchange can, during the use of the key telephone, follow the signal indicating the on-hook / off-hook sent through the data communication line, such as line connection and release. Since the control can be performed and the above control can be performed in accordance with the monitoring output from the DC loop monitoring unit during the use of the general terminal device, for example, in the case of using the general terminal device, the communication is generally terminated with the end of communication. When the terminal device is opened or when the attached subscriber line is disconnected for some reason, the exchange can immediately perform the line opening process, and the line closed state is not unnecessarily continued.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a telephone communication device according to an embodiment of the present invention, and FIGS. 2 to 4 are flowcharts showing the control procedure of an electronic exchange constituting the telephone communication device, FIGS. FIG. 6 is a flow chart showing the control procedure of the key telephone in the embodiment of the present invention connected to the electronic exchange. 100 ... Electronic exchange, 101 ... Control section 102 ... Data communication section 103 ... Station line trunk section 104 ... Call path section, 105 ... Subscriber circuit section 106 ... DTMF receiving section 107 ... DC loop monitoring Unit 108 …… Bell signal generator 109 …… Relay contact 110 …… Subscriber interface unit 201 …… Data communication line, 202 …… Subscriber line 203 …… Attached subscriber line 300 …… Button telephone, 301 …… Control Part 302 …… Data communication part, 303 …… Display part 304 …… Operation part, 305 …… Call circuit part 306 …… Handset, 307 …… Relay contact 308 …… Relay contact, 309 …… Switch button 401 …… General Terminal device

Claims (2)

[Claims] 1. A communication means for exchanging signals with an electronic exchange through a data communication line, and a call circuit section for transmitting a signal to a call line from the electronic exchange and for extracting a received signal from the call line. Connection means for connecting an attached subscriber line connected to the general terminal device, first switching means for connecting or disconnecting the communication line to or from the communication circuit section, and the communication line for the general terminal device. Second switching means for connecting or disconnecting to the connected auxiliary subscriber line side, and switching for switching to a mode in which the button telephone itself can be manually used from the outside or a mode in which the connected general terminal device can be used A switch for controlling the first and second changeover switches in accordance with the mode, and an electronic signal each time the mode is changed by the changeover switch. Key telephone, characterized in that is configured to send a signal indicating the mode at that time via the data communication line to 換機 side. 2. Communication means for exchanging signals with an electronic exchange through a data communication line, and a communication circuit section for transmitting a signal to a communication line from the electronic exchange and for extracting a received signal from the communication line. Connection means for connecting an attached subscriber line connected to the general terminal device, first switching means for connecting or disconnecting the communication line to or from the communication circuit section, and the communication line for the general terminal device. A second switching means for connecting or disconnecting to the connected auxiliary subscriber line side, and a mode for manually operating the button telephone itself from the outside or a mode capable of using the connected general terminal device. And a changeover switch,
The control means controls the first and second switching means in accordance with the mode and sends a signal indicating the current mode through the data communication line to the electronic exchange every time the mode is switched by the switch. A DC loop monitor having a key telephone and monitoring the DC loop current of the telephone line, a data communication means for exchanging signals with the telephone via the data line provided with the telephone line, and the time from the telephone key. Always monitor whether the signal indicating the mode indicates that the key telephone itself is in the usable mode or the connected general terminal is in the usable mode, and based on that information According to the monitoring output from the DC loop monitoring unit, or according to the signal indicating on-hook and off-hook input through the data communication means. Or a having an electronic switching system having a control means for determining, telephony device, characterized in that was connected to the key telephone set to the electronic exchange.