JPH08181783A - Key telephone set - Google Patents

Abstract

PURPOSE: To allow a telephone set to identify a transfer state of a transfer box controlling transfer of each external line call and to inform it to the user without provision of a new interface circuit to a master set of the key telephone set. CONSTITUTION: A transfer box 7 and an existing single telephone set interface 21 of a master set 1 are connected by two wires, and when a transfer state of an external line call of the transfer box is detected, a relay contact RY5 closed normally is open to a 2-wire DC loop to allow the master set to identify the transfer state. As a result, the master set identifies the transfer state of the transfer box without provision of a new interface circuit to the master set of the key telephone set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone system in which a transfer box for transferring an external line call between external lines is housed between a main unit and a plurality of external lines.

[0002]

2. Description of the Related Art In general, a button telephone system is composed of a main unit for accommodating a plurality of outside lines and a plurality of key telephones accommodated in the main unit. When the main unit detects an outside line selection operation on the key telephone, it captures the outside line corresponding to this operation, and when it detects a dial operation on this button telephone, it sends a dial signal corresponding to the dial operation to the captured outside line. Call the other party. Then, according to the response of the other party, an outside line outgoing call is made via the key telephone. On the other hand, when an incoming call arrives at any of the plurality of outside lines,
The main device outputs each command data of blinking of the outside line lamp and ringing of the corresponding ring tone to each key telephone, and when it detects an incoming response operation of any key telephone, it captures the corresponding outside line. As a result, an incoming call answering call via the key telephone is realized.

In recent years, a transfer function (for example, when an incoming call arrives at an outside line A from a user of such a key phone device as it is at an outside line A, a preset transfer destination is set). Frequently, a request is made to add a function of automatically transmitting a telephone number and making a call between the caller of the outside line A and the transfer destination of the outside line B according to the response of the transfer destination. If a transfer box that is commercially available for such a request is connected to the key telephone device, the transfer function can be easily realized. FIG. 11 is a diagram showing an example in which the above-mentioned transfer box is connected between the external lines 2 ₁ and 2 ₂ and the main device 1. The transfer box 9 includes an incoming call detection circuit 91, a loop / polarization detection circuit 92, Transfer control circuit 93, setting switch 94, contacts 95 and 96 such as relay contacts, switch 9
It consists of 7.

Here, the external line 2 ₁ is designated in advance as a transfer incoming / outgoing line, and the external line 2 ₂ is designated in advance as a transfer outgoing / outgoing line. In this case, when the incoming call arrives at the incoming / outgoing external line 2 ₁ and the incoming call detection circuit 91 notifies the incoming call, the transfer control circuit 93 sets the switch 94.
Setting indicates the transfer mode, and that the transfer outgoing / outgoing line 2 ₂ is not used on the main unit 1 side via the loop / polarization detecting circuit 92, the contact 96 is driven and controlled to transfer the outgoing / outgoing external line. 2 ₂ is captured and the transfer destination telephone number preset in the setting switch 94 is output as a dial signal.
As a result, the transfer destination is called and the transfer destination's response is looped.
When detected by the inversion detection circuit 92, the transfer control circuit 9
3 drives and controls the contact 95 to capture the transfer incoming / outgoing line 2 ₁ and responds to the incoming call, and controls the switch 97 to connect the call path between the transferring / incoming outside line 2 ₁ and the forwarding outbound line 2 ₂ . In this way, a transfer call via the transfer box 9 can be realized.

[0005]

However, the main unit of the key telephone unit does not have a dedicated communication interface with such a commercially available transfer box, and the transfer box cannot know whether or not the transfer is in progress. was there.
On the other hand, there is an idea to newly install an interface circuit (unit) dedicated to the transfer box on the main device side,
The existing main device has a problem that a new interface circuit cannot be accommodated due to space limitations. Therefore, the present invention does not provide a new interface circuit in the main unit of the key telephone device and uses the existing equipment of the main unit so as not to expand the space of the existing main unit, so that the transfer box of the main unit side can be installed. The purpose is to identify in transit.

[0006]

SUMMARY OF THE INVENTION In order to solve such a problem, the present invention allows a single telephone to be connected by a first interface for accommodating a plurality of external lines and connecting a button telephone and two lines. A main device equipped with a second interface having a detection unit for detecting the opening or closing of the two-wire DC loop, and an incoming call coming to a forwarding incoming external line among a plurality of external lines are forwarded via the forwarding outgoing external line. In a key telephone device provided with a transfer box for transferring to a preset transfer destination, the transfer box and the second interface are connected by the above-mentioned two lines, and the transfer box detects transfer during transfer. The detecting means, the relay for opening or closing the DC loop for the two wires, and the relay for controlling the DC loop to be normally closed, and the transfer detecting means Provided a relay control means for opening controlling the DC loop by the detection output during, and the main apparatus,
Identification means is provided for identifying that the transfer is in progress by detecting the opening of the DC loop by the transfer detection means.

Further, in the transfer box, the transfer external line is held in response to an incoming call that arrives at the transfer external line, and the transfer external line is put out in response to the transfer destination response by making a call to the transfer external line. Detecting means for detecting predetermined information based on a predetermined operation of the key telephone via two lines, and a path between the transfer incoming external line and the transfer outgoing external line are connected in accordance with the detection output of the detecting means, and the relay control means is provided. And a transfer control means for controlling and opening the DC loop, and the main unit releases the holding state of the incoming line for transfer and the outgoing line for transfer by the identification output of the identifying means and the key telephone during the transfer of the transfer box. Is provided with means for displaying. In addition, a transmission means for transmitting to the main device, function setting information such as a transfer incoming external line, a transfer outgoing external line, and a transfer destination telephone number sent to the transfer outgoing external line to the transfer box via the second interface. , Detecting the predetermined setting operation of the key telephone, and connecting the path between the first interface and the second interface according to the detection output of the detecting means and controlling the transmitting means to respond to the operation of the key telephone. A control means for transmitting the function setting information is provided. In addition, the transfer box is provided with a voice signal generation circuit for transmitting a predetermined voice message to the key telephone via the main device when the function setting information is received.

[0008]

When the transfer detecting means detects that the transfer is in progress, the normally closed 2-wire DC loop connecting the transfer box and the second interface of the main unit is opened, The device side is notified that the transfer is in progress and the main device side is made to identify. As a result, the main device side can identify the transfer in the transfer box without providing a new interface circuit in the main device of the key telephone device. Further, when the predetermined information based on the predetermined operation of the key telephone holding the respective calls of the transfer incoming outside line and the transfer outgoing outside line is detected via the two lines, the transfer box receives the transfer incoming outside line and the transfer outgoing line. The path to the outside line is connected to perform the outside line transfer, and the DC loop of the two lines is released. On the other hand, the main unit releases the hold state of each outside line and displays on the key telephone that the transfer box is transferring. . As a result, even when the transfer is performed in the transfer box by a manual operation on the key telephone side, the transfer in the transfer box can be accurately identified.

Further, when a predetermined setting operation of the key telephone is detected, the path between the second interface and the key telephone is connected, and the function setting information such as the transfer outgoing line and the transfer destination telephone number based on this setting operation is transferred. Send it to the box and register it. As a result, the transfer box does not require a switch or the like for setting the function setting information, so that the transfer box can be economically constructed and the transfer box can be reliably controlled. Further, when the function setting information is received by the transfer box, a predetermined voice message is sent to the key telephone which has performed the setting operation. As a result, the setting for the transfer box can be performed reliably and easily.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing a schematic configuration of a key telephone device according to the present invention.
And a plurality of key telephones 5 _{1 to} 5 _m and a plurality of outside lines 2
₁ and 2 ₂ are arranged between the main unit 1 and the external wires 2 ₁ and 2 respectively.
_It is composed of a transfer box 7 for transferring an outside line call between the _two . By the way, the main unit 1 has the above-mentioned key telephone 5 ₁
In addition to ˜5 _m, a plurality of individual telephones (not shown) can be connected. Therefore, in the existing main unit 1, each individual telephone interface for connecting each individual telephone with two lines is provided. .

Of the individual telephone interfaces in the main unit 1, in this embodiment, the transfer box 7 is connected by two lines to the terminal 6 ₁ of the single telephone interface 21 to which the single telephone is not connected. To do. Thus, by connecting the transfer box 7 using the existing single telephone interface 21 in the existing main device, the main device 1 does not have to be provided with a new interface circuit and the space of the existing main device 1 can be saved. The communication interface of the transfer box 7 can be secured on the main device 1 side without expansion. In addition, the main device 1 uses the transfer box 7 as described later.
Since the state can be identified through the two lines connected to the transfer box 7, it can be easily identified whether or not the transfer box 7 is transferring an outside line call.

Next, FIG. 4 is a block diagram showing a detailed structure of the main unit 1 and the key telephone 5 which constitute the above-mentioned key telephone apparatus. In the figure, the main device 1 includes external lines 3 _{1 to} 3 _n including external lines 3 ₁ and 3 ₂ via a transfer box 7.
External line interfaces 11 ₁ to 1
1 _n , call path switch 12, telephone interface 13
_{1 to} 13 _m , CPU 14, ROM 15, RAM 16, holding IC 17 that sends a holding sound to an outside line when holding, PB sender 18 that sends a PB signal to transfer box 7, receive PB signal from each outside line or transfer box 7 P
It is composed of a B receiver 19, a recording IC 20 for recording a message or the like from an outside line, and the above-mentioned single telephone interface 21.

In the single telephone interface 21, a two-wire loop is closed by closing a contact RY5, which will be described later, of the connected transfer box 7, or when the single telephone is connected, the loop is set by off-hook of the single telephone. A loop detection circuit 21A for detecting closure and a power supply circuit 21B for supplying power to a connected single telephone or the like are provided. In addition, the key telephone 5 is a call circuit 5
1, a transmission circuit 54, a control unit 55, a display circuit 56, a keyboard 57 that accommodates dial keys and the like.

In the system composed of the main unit 1 and the key telephone set 5 configured as described above, the main unit 1 always receives operation data from each key telephone set, and makes an outside line call and extension call according to the operation data. Etc., and switching connection processing such as incoming call control for detecting an incoming call coming from each outside line and notifying each key telephone of the incoming call. Here, when the main device 1 communicates with the transfer box 7 connected to this interface 21 through the single telephone interface 21, the process is performed as follows. That is, in this case, the particular key telephone, for example, key telephone set 5 ₁ performs a predetermined dial key operation to off-hook, the transmitted main apparatus 1 C this operation data to the main device 1
It is received by the PU 14. In this case, the CPU 14 controls the call path switch 12 to connect the path between the telephone interface 13 ₁ and the independent telephone interface 21, thereby connecting the path between the key telephone 5 ₁ and the independent telephone interface 21.

When the dial operation is performed by the key telephone 5 _{1 in} this state, the CPU 14 causes the PB sender 1
8 to drive the PB dial signal corresponding to the operation data via the single telephone interface 21 to the transfer box 7
Send to. In this way, the transfer box 7 can be accessed from the main device 1 side, and in this case, the transfer box 7 side has a transfer incoming line, a transfer outgoing line, and a transfer destination, which are necessary for transfer control of an external line call, as described later. The telephone number etc. are set. Further, when the loop closed state of the transfer box 7 which is constantly detected by the loop detection circuit 21A in the single telephone interface 21 becomes the loop open state, the main device 1 transfers the call on the transfer box side as described later. Therefore, it is determined that the outside lines 2 ₁ and 2 ₂ are being used, and the button telephones 5 _{1 to} 5 _m are instructed to turn on the outside line lamps corresponding to the outside lines 2 ₁ and 2 ₂ to turn on the outside line lamps. Let As a result, the users of the key telephones are required to access the outside lines 2 ₁ , 2
₂ can be identified as being used, and capture of the outside lines 2 ₁ and 2 ₂ by the user's operation of the key telephone can be avoided.

Next, FIG. 1 is a block diagram showing the detailed structure of the transfer box 7. The transfer box 7 is a CPU 7
1, external 2 _1, 2 incoming detection circuit ₇₂ and 73 ₂ of the incoming detecting each loop detection circuit 74 and 75 for detecting the presence or absence of the loop forming the outside line 2 _1, 2 _2, respectively, outside line 2 ₂
Reversal detection circuit 76 for detecting reversal of
A PB receiver 78, a voice LSI 79, a dial output circuit 80 for outputting a dial signal to an outside line 2 ₂ , a switch circuit 81, a voice switch 82, a cross point 83 which is a communication path, a transfer outgoing line, a transfer destination telephone number, etc. are stored. It is composed of an EEPROM 84 and the like. In addition, RY1 to RY5
Are contacts, and T1 to T3 are transformers.

In this transfer box 7, the contact point R is always present.
Y2 and RY4 are closed, so the outside lines 2 ₁ and 2 ₂
Are connected to the main device 1 via contacts RY2 and RY4, respectively. Further, the contact RY5 also always is閉結,閉結state of the two-wire loop according閉結of the contact RY5 is output as described above, the single line telephone interface 21 of the main device 1 via the terminal 6 ₂ , Further detected by the loop detection circuit 21A and notified to the CPU 14, C
It is identified by PU14.

In the transfer box 7 configured as described above, during the automatic transfer mode setting, an incoming call arrives at the external line 2 ₁ set as a transfer incoming external line, and this is detected via the incoming call detection circuit 72. Then, the CPU 71 first closes the contact RY3 to make an external line 2 ₂ which is a transfer transmission external line.
Close the loop. And after that, the EEPROM 84
The transfer destination telephone number set in step 1 is read out and sent to the dial output circuit 80, and the dial output circuit 80 outputs the dial signal to the outside line 2 ₂ . As a result, the transfer destination is called. After that, when the response of the transfer destination is detected through the reversal detection circuit 76, the CPU 71 closes the contact RY1 to respond to the incoming call of the outside line 2 ₁ , and controls the crosspoint 83 to control the outside line 2 ₁ And the call path of the outside line 2 ₂ is connected.
In this way, a call is made between the caller from the outside line 2 ₁ and the transfer destination of the outside line 2 ₂ via the voice switch 82. Also, C
When the PU 71 connects the call path between the outside line 2 ₁ and the outside line 2 ₂ , the PU 71 informs the main device 1 that the outside line call is being transferred by opening the contact RY5, and the contacts RY2 and RY.
4 is opened to disconnect each of the external wires 2 ₁ and 2 ₂ from the main device 1.

Next, the operation of the transfer box 7 will be described in more detail with reference to the flowchart of FIG. For example, as shown in the flowchart of FIG. 9 described later, when a predetermined dial operation is performed on the key telephone side, a PB dial signal corresponding to the operation dial data is sent from the PB sender 18 of the main unit 1 to the transfer box 7. It CPU71
Is the PB of the PB signal sent from this PB sender 18.
The presence or absence of reception by the receiver 78 is determined in step S1. If "Y" is obtained in step S1, then in step S2, whether or not the received dial data by the PB signal is data indicating a manual transfer operation for connecting the outside lines 2 ₁ and 2 ₂ to transfer the call. If it becomes "Y", a transfer process described later for connecting the external lines 2 ₁ and 2 ₂ is executed in step S3.

If the dial data is not the data indicating the manual transfer operation, then it is determined in step S4 whether or not the dial data is data instructing the box 7 to set the automatic transfer mode. If this is determined to be "Y", EEPRO is executed in step S5.
Set the automatic transfer mode in M84. If the dial data is not the data for instructing the setting of the automatic transfer mode, it is determined in step S6 whether or not the data is the data for instructing the cancellation of the automatic transfer mode, and when it is "Y", it is set in the EEPROM 84. The automatic transfer mode that has been set is cleared and released in step S7, and the process proceeds to step S9. If the dial data does not correspond to any of the above, in step S8, for example, a process of setting this data in the EEPROM 84 as the transfer destination telephone number or a transfer transmission line to which the transfer destination telephone number is output is set to the EEPROM 8
Other processing such as the processing for setting to 4 is performed in step S9.
Move to.

In step S9, the incoming call detection of the incoming / outgoing line (that is, the outside line 2 ₁ which is the transfer incoming / outgoing line in the present embodiment) is determined. When it becomes "Y", it is automatically referred to the EEPROM 84 in step S10. After confirming the transfer mode setting, in step S11 the outgoing line (that is, EEPR)
The transfer outgoing line set in the OM 84 is shown, and in this embodiment, the outside line 2 ₂ ) is captured. Then step S12
Then, the transfer destination telephone number is read from the EEPROM 84, output to the dial output circuit 80, and a dial transmission process is executed to send a dial signal from the dial output circuit 80 to the outside line 2 ₂ .

Thereafter, the response of the transfer destination and the termination of the incoming call of the outside line 2 ₁ are determined in steps S13 and S14, respectively, and the response of the forwarding destination of the outside line 2 ₂ is passed through the reversal detection circuit 76 while the incoming call of the outside line 2 ₁ is continued. Is detected (transfer detection means), a transfer process for connecting the outside lines 2 ₁ and 2 ₂ is performed in step S15, and then other processes are executed in step S17 and the process returns to step S1. Further, when the termination of the incoming call of the outside line 2 ₁ is detected while the transfer destination does not respond and the determination in step S14 becomes "Y", the outside line 2 ₂ captured is released in step S16, and the processes from step S17 are executed.

The above-mentioned "manual transfer" in step S2 is actually performed in the following procedure. That is, when an incoming call arrives at the external line 2 ₁ which is a transfer incoming external line, the key telephone 5 sounds the incoming call, and the key telephone 5 first responds to this and puts the external line 2 ₁ on hold. Then, the hold IC of the main device 1
The hold tone is sent from 17 to the outside line 2 ₁ , and the key telephone 5
The external line 2 ₁ lamp will flash. After that, the key telephone 5 captures the outside line 2 ₂ which is a transfer transmission outside line, dials the transfer destination telephone number, and calls the transfer destination. When the response is confirmed, the key telephone 5 holds the outside line 2 ₂ .
Then, similarly holding tone is sent from the pending IC17 of the main apparatus 1 to the outside line 2 _2, outside line 2 ₂ of lamps EKT 5 flashes.

Thereafter, when the key telephone 5 performs a transfer operation, the above-mentioned dial data is output from the PB sender 18 of the main unit 1 to the transfer box 7. As a result, the transfer process is performed in step S3 described above. In this transfer process, as will be described later, the paths of the external lines 2 ₁ and 2 ₂ are connected and the contact RY5 is opened. When the main device 1 detects the opening of the contact RY5, it stops the sending of the holding tone to each outside line, and connects so that the lamps of the outside lines 2 ₁ and 2 ₂ of the key telephone 5 are turned on. On the key telephone 5 side, it can be confirmed that the manual transfer is performed.

Next, the detailed operation of the above-mentioned transfer processing will be described with reference to FIG.
A description will be given based on the flowchart. That is, in step S21, the contacts RY1 and RY3 are closed to connect the outside line 2 ₁
The (outgoing line) and the outside line 2 ₂ (outgoing line) are captured, and then the crosspoint 83 is controlled in step S22 to control the outside line 2 ₁
And the external line 2 ₂ are connected to make a call with the transfer destination via the transfer box 7 on the calling side. Then, during the transfer call, in a succeeding step S23, a process of opening a two-wire loop (two-wire loop) for opening the contact RY5 which is normally closed is performed to notify the main unit 1 that the transfer is in progress.
As a result, each key telephone has an outside line 2 as described above.
_The outside line lamps corresponding to ₁ and 2 ₂ are turned on, and the user of each key telephone can be informed that the outside lines 2 ₁ and 2 ₂ are unavailable during this period.

Thereafter, in step S24, the loop detection circuits 74 and 75 are used to detect the open loop of the outside line 2 ₁ and the outside line 2 ₂ , thereby determining the call termination of the calling side and the called side. When the loop opening of the outside line is detected and the determination in step S24 becomes "Y", the trapped states of the outside line 2 ₁ and the outside line 2 ₂ are released in step S25. Subsequently, in step S26, the crosspoint 83 is controlled to open the connection bus between the external line 2 ₁ and the external line 2 ₂ to terminate the transfer call, and then in step S27, the open contact RY5 is closed 2
Capture the wire loop (close the 2 wire loop),
Notify the main unit 1 that a non-transfer call is in progress. As a result, it is possible outside line 2 _1, 2 ₂ external lamps of each key telephone corresponding to the turned off, to recognize the user of the key telephone sets that outside line 2 _1, 2 ₂ becomes available.

Next, the operation of the main unit 1 which responds to the transfer processing of the transfer box 7 as described above will be explained based on the flowchart of FIG. In the CPU 14 of the main device 1, the RAM
In step S31, it is determined whether or not the transfer box 7 is connected to the single interface 21 by referring to the function setting information preset in the predetermined area 16 and the transfer box 7 is connected by this function setting information. If it is determined that the loop detection circuit 21
The opening / closing of the above-mentioned two-wire loop is judged via A. Here, the contact RY5 of the transfer box 7 is opened and step S3
When the "2 wire loop open" of 2 becomes "Y", the lighting data of the outside line lamps corresponding to the outside lines 2 ₁ and 2 ₂ which are the outside line and the outside line are transmitted to each button telephone in step S33. The outside line lamp is turned on, and then step S3
In step 4, the transfer in-use flag is set in the RAM 16, and the process ends. As a result, the user of the key telephone is outside line 2 _1,
It is possible to identify that 2 ₂ is used, and thus prevent the user from capturing the outside lines 2 ₁ and 2 ₂ .

Thus, when the outside lines 2 ₁ and 2 ₂ are used by the transfer box 7 and the outside line lamps of the button telephones corresponding to the outside lines are in the lighting state, the transfer box 7 finishes transferring the call and Outer line is open and contact RY5
Is closed, it is determined that the “opening of the two-wire loop” in step S32 is “N”. In this case, the CPU 14 determines in step S35 whether or not the transfer in-use flag of the RAM 16 is set, and if the transfer in-use flag is set, in step S36, the outside line lamps corresponding to the outside lines 2 ₁ and 2 ₂ are turned on. The turn-off data is transmitted to each button telephone to turn off each outside line lamp, and subsequently, the transfer in-use flag is reset in step S37, and the process ends. As a result, outside line 2
_It is possible to identify that ₁ and 2 ₂ are ready for use.

Next, FIG. 2 is a block diagram showing a second embodiment of the transfer box 7. This second embodiment is different from the contacts RY2 and RY4 shown in the first embodiment of FIG.
Y6 and RY7 are provided, and the transfer box 7 has an outside line 2
_{When 1} and 2 ₂ are in use, the contacts RY6 and RY7 are driven and controlled to disconnect the external lines 2 ₁ and 2 ₂ from the main device 1 and the main device 1
And the audio LSI 79 are connected.
With this configuration, when the outside lines 2 ₁ and 2 ₂ are used in the transfer box 7, they are not caught even if the outside line 2 ₁ or the outside line 2 ₂ is captured on each button telephone side. Then, the voice LSI 79 sends out a voice message stating, “External lines 2 ₁ and 2 ₂ are currently being used in the transfer box”. Therefore, the user of each key telephone can easily identify that the outside lines 2 ₁ and 2 ₂ are being used.

FIG. 8 is a flow chart showing the operation of the second embodiment of such a transfer box, and the first operation shown in FIG.
The same parts as those of the operation of the embodiment are designated by the same reference numerals. That is,
In step S41 after capturing the outside lines 2 ₁ and 2 ₂ and further connecting the paths of the outside lines 2 ₁ and 2 ₂ , the contact points RY6 and R
Y7 is driven and controlled, the external lines 2 ₁ and 2 ₂ are separated from the main unit 1, and the connection terminals 3 ₁ and 3 of the external lines 2 ₁ and 2 ₂ of the main unit 1 are separated.
_After connecting ₂ to the voice LSI 79, the voice LSI 79 is driven to send the above voice message to the main device 1 side.

When the main unit 1 tries to capture the outside line 2 ₁ or the outside line 2 ₂ by the operation on the key telephone side, the outside line is not captured and the above-mentioned voice message output from the voice LSI 79 is transmitted. Contact RY6 or RY7
, And further to the key telephone side via the main unit 1. As a result, the user of the key telephone that has accessed the outside line can recognize that the outside line is in use. Thereafter, when the call end outside line 2 ₁ or external 2 ₂ is detected, opening of the outside line 2 _1, 2 ₂ of the opening and the external line 2 _1, 2 ₂ of the connection path is performed, in a subsequent step S42, the contact RY6 , RY7 are restored and main device 1 and outside lines 2 ₁ , 2 ₂
Are connected to stop the driving of the audio LSI 79.

Next, the CPU of the main unit 1 which performs the function setting such as the setting of the transfer destination telephone number in the transfer box 7
The detailed operation of 14 will be described based on the flowchart of FIG. Off-hook or speaker key is operated on a specific key telephone 5 ₁ and this operation data is sent to the main unit 1
When it is transmitted to, the judgment in step S51 becomes “Y”. Subsequently, when the dial key is operated in the key telephone 5 ₁ and dial data “0” and “0” are transmitted, the determination in step S52 is “Y”, and in this case, the CPU 14 determines that the transfer box 7 is connected. The presence or absence is determined in step S53. In this case, the CPU 14 inputs the detection output of the loop detection circuit 21A of the single telephone interface 21 and the transfer box 7 if the loop is closed.
Is connected to the interface 21, and the call path switch 12 is controlled in the following step S54 to control the single telephone interface 21 and the telephone interface 13 _1.
By connecting and, a call path between the transfer box 7 and the key telephone 5 ₁ is formed.

After that, the PB sender 18 is driven to output the dial "#" by the PB signal to the transfer box 7 in step S55. By the transmission of this PB signal, a voice message "It is a transfer box" is transmitted from the transfer box side to the key telephone 5 ₁ side as described later. Then, it is determined in step S56 that the dial key operated on the key telephone 5 ₁ side in response to the transmission of the voice message is pressed, and if it is "Y", step S56 is performed.
At 57, the PB dial signal corresponding to this operation data is sent to PB.
It is generated from the sender 18 and sent to the transfer box 7 via the call path switch 12 and the single telephone interface 21. By the transmission of this dial signal, the transfer destination telephone number and the transfer outgoing line are set on the transfer box 7 side.
After that, if it is detected that the on-hook or the speaker button is operated again on the side of the key telephone 5 ₁ and it is determined as “Y” in step S58, the setting operation is ended, and thus the call path is set in step S59. Switch 12
Is controlled to open the connection path between the key telephone 5 ₁ and the independent telephone interface 21 and terminate.

Next, the operation of the CPU 71 of the transfer box 7 in response to the operation on the side of the main device 1 as described above will be described in detail with reference to the flowchart of FIG. First, in step S61, it is determined whether the PB signal is received from the main device 1 side via the PB receiver 78. If the PB signal is received here, it is then determined in step S62 whether or not the transfer destination telephone number or the like is being set in this transfer box. If not, the received PB signal is dialed "#". It is determined in step S63. If the dial "#" is received here, it means that the setting operation is started for the transfer box 7. Therefore, the setting operation flag is set in the internal memory in step S64, and subsequently, in step S65, the audio LSI 79 is set. By controlling the drive and switch circuit 81, the voice LSI 79 outputs a voice message "Transfer box", and the key telephone 5 ₁ which is the setting telephone.
To step S71.

If the setting operation is already started and the setting operation flag is set when the PB signal is received, and the "setting operation in progress" in step S62 becomes "Y",
The dial “*” and dial “n” (n = 0, 1) operated after the dial “#” which has already been received by this reception signal.
.About.9) is determined in step S66. If the determination in step S66 is "Y", the process proceeds to step S67. In step S67, it is determined whether or not the dial "n" following the dial "*" is "9". If not, the main device 1
Various received data processes for processing the dial data received from the process are executed in step S68, and at the same time, in step S6.
At 9, various audio output processes are executed.

That is, when, for example, two-digit dials "5" and "2" are received after the dial "*", and the subsequent multiple-digit dial data is received, the multiple-digit dial data is transferred and transmitted as described above. In step S68, the process of registering in the EEPROM 84 as the transfer destination telephone number output to the outside line 2 ₂ is executed. When the two-digit dials "*" and "*" indicating the end of registration are further received, the voice LSI 79
By driving a executes a process of sending the "destination telephone number ××× ··· × has been registered" effect of the voice message to the button telephone 5 ₁ at step S69.

If, for example, the dial "2" is received after the dial "*", the external line 2 ₂ is used as a transfer external line and E
The process of registering in the EPROM 84 is executed in step S68. In this case, the process of driving the voice LSI 79 and transmitting a voice message to the effect that the outside line 2 ₂ has been registered as a transfer transmission outside line to the key telephone set 5 ₁ is performed. S69
Done in. If, for example, a two-digit dial "6" or "2" is operated on the key telephone 5 ₁ after the dial "*", the telephone number output from the transfer box 7 to the "outgoing outgoing line 2 ₂ " is XX・ ・ ・ × is registered ”
A voice message to that effect is output and the dial "*"
Then, for example, when the dial "3" is operated, a voice message stating "External line 2 ₂ is registered as a transfer / transmission external line" is output, so that the registered contents can be confirmed.

After various registration settings are made in this way, 2
When the digit dials "*" and "9" are operated and received, the determination in step S67 becomes "Y". In this case, the setting operation flag is cleared in step 70 and the various registration setting processing ends. . In this way, the EEPROM 8
When the transfer destination telephone number and the transfer destination external line are set in 4, the above-described incoming call detection and transfer process for transferring the incoming call of the external line 2 ₁ to the external line 2 ₂ is executed in step S71 based on the contents set in the EEPROM 84. To be done.

As described above, by connecting the main device 1 and the transfer box 7 via the single telephone interface 21 which is the existing interface, the main device side can identify the transfer of the transfer box. is there. As a result, it is possible to identify that the transfer box 7 is being transferred on the main device 1 side without providing the main device 1 with a dedicated interface. Further, when setting information such as a transfer outgoing line and a transfer destination telephone number in the transfer box 7, the main device transmits the function setting information to the transfer box 7 through the interface 21 and sets the function setting information. is there. As a result, the transfer box 7 does not require a setting switch or the like, so that the transfer box can be economically constructed and the function setting for the transfer box can be surely performed.

[0040]

As described above, according to the present invention, when the transfer box and the existing second interface of the main device are connected by two lines, the transfer detection means detects the transfer of the transfer box. Since the two-wire DC loop that is normally closed is opened and the main device side is made to identify that the transfer is in progress, a new interface circuit is not provided in the main device of the key telephone device, The main unit side can identify that the transfer box is being transferred. Further, when the predetermined information based on the predetermined operation of the key telephone holding the respective calls of the transfer incoming outside line and the transfer outgoing outside line is detected via the two lines, the transfer box receives the transfer incoming outside line and the transfer outgoing line. The path to the outside line is connected to perform the outside line transfer, and the DC loop of the two lines is released. On the other hand, the main unit releases the hold state of each outside line and displays on the key telephone that the transfer box is transferring. Thus, even when the transfer is performed in the transfer box by a manual operation on the key telephone side, the transfer in the transfer box can be accurately identified.

When a predetermined setting operation of the key telephone is detected, the path between the second interface and the key telephone is connected, and the function setting information such as the transfer outgoing line and the transfer destination telephone number based on this setting operation is transferred to the transfer box. Since it is sent to and registered to the transfer box, the transfer box does not require a switch for setting the function setting information, so the transfer box can be economically constructed and transfer control can be reliably performed for the transfer box. Can be done. Further, when the function setting information is received in the transfer box, a predetermined voice message is sent to the key telephone that has performed the setting operation, so that the setting in the transfer box can be performed reliably and easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a transfer box constituting a key telephone device of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the transfer box.

FIG. 3 is a block diagram showing a schematic configuration of the key telephone device.

FIG. 4 is a block diagram of a main device and a key telephone which constitute the key telephone device.

FIG. 5 is a flowchart showing the operation of the transfer box.

FIG. 6 is a flowchart showing the operation of the first embodiment, which is the main operation of the transfer box.

FIG. 7 is a flowchart showing the operation of the main device.

FIG. 8 is a flowchart showing the operation of the second embodiment, which is the main operation of the transfer box.

FIG. 9 is a flowchart showing an operation of setting various kinds of information in the transfer box of the main device.

FIG. 10 is a flowchart showing a setting operation of various information in the transfer box.

FIG. 11 is a block diagram of a conventional device to which a transfer box is added.

[Explanation of symbols]

1 ... main unit, 2 ₁ to 2 _n ... external line, 5 ₁ to 5 _m ... EKT, 7 ... transfer box, 14,71 ... CPU, 12 ...
Call path switch, 13 ... Telephone interface, 18,
77 ... PB sender, 19,78 ... PB receiver, 21 ...
Single telephone interface, 21A, 74, 75 ... Loop detection circuit, 72, 73 ... Incoming call detection circuit, 76 ... Inversion detection circuit, 79 ... Voice LSI, 80 ... Dial output circuit,
83 ... Crosspoint, 84 ... EEPROM, RY1
RY7 ... contact.

Claims (4)

[Claims] 1. A first interface for accommodating a plurality of external lines and connecting a key telephone set, and a detection unit for detecting the opening or closing of a DC loop of the two lines, by which a single telephone set can be connected. Button telephone provided with a main device having a second interface and a transfer box for transferring an incoming call coming to a transfer incoming external line of the plurality of external lines to a preset destination via the outgoing outgoing line for forwarding In the device, the transfer box and the second interface are connected by the two wires, and the transfer box has transfer detection means for detecting that the transfer is in progress, and a DC loop for the two wires is opened or closed. Control the relay so that the DC loop is normally closed with the relay that performs connection, and open the DC loop by the detection output during transfer by the transfer detection means. And a control relay control unit and the main unit, key telephone system which comprising the identifying means for identifying that it is being transferred by the opening detection of DC loop by the transfer detecting means. 2. The key telephone device according to claim 1, wherein the transfer external line is held in the transfer box in response to an incoming call arriving at the transfer external line, and the transfer external line is called and transferred. Detecting means for detecting, through the two lines, predetermined information based on a predetermined operation of the key telephone set for holding the transfer outgoing line by the above response, and the transfer incoming external line and the transfer line according to the detection output of the detecting means. A transfer control means for connecting a path to an outgoing external line and controlling the relay control means to open the DC loop, and to the main device by the identification output of the identification means, A key telephone device, comprising means for releasing the holding state of an outgoing line for use and displaying on the key telephone that the transfer box is transferring. 3. The key telephone device according to claim 1, wherein the main device is provided with function setting information such as the transfer incoming external line, the transfer outgoing external line, and the transfer destination telephone number sent to the transfer outgoing external line. Transmitting means for transmitting to the transfer box via the second interface, detecting means for detecting a predetermined setting operation of the key telephone, and first and second interfaces according to the detection output of the detecting means. And a control unit for controlling the transmitting unit to transmit the function setting information according to the setting operation of the key telephone, and registering the function setting information in the transfer box. Button telephone device. 4. The key telephone device according to claim 3, wherein the transfer box sends a predetermined voice message to the key telephone via the main unit when the function setting information is received. A button telephone device characterized by being provided with.