JPS6022872B2 - Extension call control method for button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a button telephone device that accommodates a central office line from a telephone office and a plurality of button telephones (hereinafter referred to as telephones), and that performs exchange connection between the central office line and the telephone or between the telephones. It is.

The conventional button telephone device consists of a main device mainly consisting of a link circuit, and a telephone with a mechanical lock button connected to the main device through a large number of indoor wires. According to the operation, the connection between telephones or the central office line is selected, and calls are made between the telephones by receiving and issuing bonds via the central office line via the main device, or by receiving power for communication from the main device, In most cases, the main device had only the function of connecting to the central office line and the function of supplying power for telephone calls, and did not have complete switching functions.

Therefore, the number of wires for each phone increases, which increases the number of installations and makes maintenance and inspection difficult.
Because the main device consists of a relay, it is large and has poor reliability, and it is extremely difficult to implement services such as issuing and receiving debt regulations and central office line reservations when making calls via central office lines. In particular, when making an extension call, even if there is no response due to the absence of the other party, the call continues and the extension call path remains closed, and the link circuit as an extension call path is blocked for a long time, so subsequent calls cannot be made. This resulted in a drawback that made it impossible.

The present invention has the object of fundamentally eliminating such drawbacks of the prior art, and provides a control unit with a processor and a control unit connected to a button telephone via a voice line and a data line and connected to the button telephone via a data line. A terminal unit provided corresponding to a plurality of button-type telephones, which is equipped with a transmitting/receiving circuit for transmitting and receiving data signals to and from the button-type telephones, and an extension call connection between the button-type telephones provided between the terminal units. In a button telephone device, in which the terminal unit and the link circuit are controlled by a processor of the main control unit, the extension call is made in response to an extension call request received by the transmitting/receiving circuit from the button telephone that made the extension call. Connect the voice line of the button-type telephone that performed the above call to the link circuit, call the other party of the extension call, and start a timer for a predetermined time. If the other party does not respond by the time the timer times out,
To provide an extremely rational extension call control method for a button telephone device that disconnects the voice line of a button telephone that makes an extension call from a link circuit.

Hereinafter, details of the present invention will be explained with reference to figures showing examples.

Figure 1 is a block diagram of the entire system, in which central office lines SL to SLm from the central office are connected to central office line units SLU, to SLUM, and only voice signals are separated, and each terminal unit TEU , ~ given in parallel to TEUn,
Exchange connections with a plurality of telephones MFT, -MGTn are made via crosspoints within the terminal units TEU, -TEUn.

Further, link circuits L to Lp are provided between the terminal units TEU and .about.TEUn, and exchange connections between the telephones MFT and .about.MFTn are also possible via the aforementioned cross points.

In addition, the terminal units TEU, ~TEUn and the telephone M circle T
, to MFTn are the voice lines VL to VLn and the data line DL. ~DLn are each connected by a 4-wire line, and the terminal unit TEU. ~TEUn and telephone M
Audio signals and data signals in the form of FS signals (frequency shift signals) are transmitted and received via line transformers provided in the FT and ~MFTn, and data signals are transmitted and received between the audio lines VL, ~VLn and the data lines DL, ~DLn. Power is supplied from the terminal units TEU, .about.TEUn to the telephones MFT, .about.MFTn via a neutral point provided in the line transformer.

In addition, main control unit MCU, station line unit SLU
, ~SLUM and the terminal units TEU, ~TEUn are equipped with a processor such as a microprocessor, and the processors of the terminal units TEU, ~TEUn decode and hold the transmission information etc. from the telephones MFT, ~MFL, and It decodes and holds incoming call information etc. given from the main control unit MCU, and sends outgoing information etc. to the main control unit MCU while sending out incoming information etc. to the telephones MFT, ~MFL according to instructions from the unit MCU. The main control unit MCU checks the outgoing information from the terminal units TEU, ~TEu, and the incoming information from the central office line units SLU, ~SLUM, and also checks the setting information of the call regulation unit CAD. After checking, the command information based on these is sent to the station line unit S.
LU, ~SLUM and terminal unit TEU, ~TEU
n, and controls the exchange operation of the entire system.

On the other hand, the telephones MFT, -MFTn are equipped with the required number of non-locking button switches and indicator lights, and are also equipped with a dial for dialing a central office line, as well as a telephone circuit and a buzzer or bell for notifying an incoming call. , a processor and a MODEM (modulator/demodulator), and the processor decodes the information generated by the button switch operation and the dial information by the dial operation, controls the MODEM, and sends it out as a data signal, while the terminal unit TE
A data signal from a MODEM provided in the U, ~TEU is received by its own MODEM, and the received output is decoded by a processor to turn on an indicator light, ring a buzzer or a bell, etc.

FIG. 2 shows the central office line unit SLU. ~ This is a block diagram of SLUM, in which a call signal is detected by a signal detection circuit DET using a diode bridge circuit and a photo coupler, etc., and this is given to the processor CPUs as incoming call information, and the relay HS is controlled by the processor CPUs. operates, and by turning on the contact h3, a loop circuit is formed via the primary winding of the line transformer LT3.At the same time, the operation and restoration of the relay HS under the control of the processor CPUs turns on the contact h3. It turns on and off and also sends out dial pulses.

FIG. 3 is a block diagram of the terminal units TEU, ~TEUn, in which the voice line VL from the telephone MmT passes through the station line unit SLU, ~SLUM via the line transformer LTv and the cross point CP, and then the station line SL, ~S- or link circuits L and ~Lp, the cross point CP is turned on under control from the main control unit MCU, thereby establishing a predetermined exchange connection.

In addition, the data line DL from the telephone MFT is connected to the MODEM/M used as a transmitting/receiving circuit via a line transformer LTd.
It is connected to the DM, and under the control of the processor CPUt, the MODEM/MDM sends the data signal as an FS signal using audio frequency, while the MODEM/MDM demodulates the data signal from the FS signal from the telephone MFT. It is provided to the processor CPUt.

Figure 4 shows the central office line unit S by the main control unit MCU.
LU, ~SLUM and terminal unit TEU, ~TEU
Exchange of information with n and same unit TEU,~TEU
This is a time chart showing the information exchange operation between n and telephones MFT, ~MFL.
If there is no incoming/outgoing information on the UM, TEU, to TEUn sides, even if the main control unit MCU sends out a boring signal to "start checking," none of them retain any information, so the boring signals will be sent one after another. The check is completed only by sending out to each unit SLU, ~SLUM, TEU, ~TEUn, and at the end of the check, a "TEU sending start" command is given to the terminal units TEU, ~TEUn from the main control unit MCU, As a result, all the terminal units TEU, .about.TEUn simultaneously send out data signals to the telephones T, .about.MFTn.

When this data signal transmission is completed, the telephone MFT
,~ Data signals are sent from the MFTn side all at once, and if there is any information, that information is sent to the terminal unit T.
EU, ~TEUn. Telephone MFT,
~ When data signal transmission from MFTn ends with "MFT transmission end", main control unit MCU performs "check start" again, but if there is "incoming call" from station line SL after the previous check time, Since this incoming call information is given from the station line unit SLU, the incoming call information is immediately sent sequentially to the terminal units TEU, -TEUn, and is held in each unit TEU, -TEUn.

Next, if you do not check the station line unit SLU2 and there is no information, check the station line unit SLUM in order, and then move on to check the terminal unit TEU.
If an outgoing call was made at the time of the previous check, this is the telephone MFT at the previous check cycle.
, the terminal unit TEU,
Since this information is held in the
If so, information to that effect is given to each station line unit SLU, ~SLUM and held, and each terminal unit TE
This information is also given to U, ~TEUn, and the terminal unit TE
U, sends a call confirmation response to the terminal unit TEU.
2 and later, a command to display that the telephone MFT is busy is held.

Additionally, if telephone MFT2 has been making an "extension call" since the last check, this information is given only to each terminal unit TEU, ~TEUn, and telephone MFT2
A command to display a busy message is also held in L.

As described above, when the occurrence of information is confirmed, the main control unit MCU sends and receives the necessary information each time, and
The other terminal units TEU, ~TEUn are checked, and each terminal unit T
The data signals representing each information are sent out from EU, ~TEUn, and the data signals from the telephones MFT, ~M'Tn are also sent out again.

As a result, the telephones MFT, . done, other phones MFT3~MFT
At n, it is displayed that the telephones MFT, , MmL are in a busy state.

In addition, dialing from each telephone M'T, to M'L,
Information such as end of call is similarly given to each terminal unit TEU, -TEUn by sending a data signal. Therefore, information is exchanged between the main control unit MCU, the central office line units SLU, ~SLUM, and the terminal units TEU, ~TE.
The staff that was all done with Un, the phone MF in one fell swoop.
T, ~MFL, and the information from the telephones MFT, ~MFTn is also transmitted at the same time, so the central office lines SL, ~SLm
The total time required is significantly reduced compared to checking information for each telephone MFT, ~M'L and exchanging information each time.

In other words, when the office line SL has 4 lines and the telephone MFT has 12 lines, and each processor CPU is a crab-it one, and its clock pulse frequency is 2 MHZ, the instruction execution speed is approximately 30 p/lmsec. Therefore, even if information is generated and information is exchanged accordingly, the time required for each station line unit SLU or terminal unit TEU is about lmsec, and the time from "start of check" to "start of TEU sending" is The required time is up to 18hsec
The transmission speed of the data signal is about 80 it/se.
c, and if one word of the data signal is composed of lIBit, then from "TEU transmission start" to telephone M
Until the data signal transmission to FT is completed, approximately 1
4 msec, and the time required for data signal transmission in the opposite direction is also the same, so the maximum time required from "check start" to the next "check start" is about 40 to 5 hsec, and the operational delay of the telephone MFT is It becomes something that you don't feel at all.

FIG. 5 is a flowchart showing the operation status of the main control unit MCU for executing the above-mentioned information exchange and various controls. Similarly, built-in RAM (Rando
m AccessMemory. ), control processing is executed while data is being accumulated in the memory.

First, after "initial state setting", the central office line unit "selects the SLU and checks and analyzes the central office line information",
If “Is processing necessary?” is YES, “select all TEUs in sequence and send commands based on station line information” and “all SLs
When the information processing from U has been completed, the terminal unit "TEU" is selected one after another and M "analyzes the information of T", and if "processing is necessary" is YES,
Based on the distinction between calling from a local line, calling from an extension, etc., and the setting information of the outgoing/receiving restriction unit OAD, if it is a “request for calling from a local line”, perform the (local line reservation) described later, and then call the central line from SL to SL.
It is determined whether the request can be accepted based on whether or not the request is busy, and if it is YES, the corresponding SLU/T
After selecting the EU and sending an operation command and performing the "timer processing" described later, the cross point CP is controlled to perform an exchange connection by "closing the corresponding communication channel". Also,''
If it is an extension call request, it is determined whether the request can be accepted depending on whether or not all link circuits L to Lp are busy, and if it is YES, it selects the relevant TEU and sends an operation command. After performing "processing", connect the voice lines of the telephone that made the extension call and the other party's telephone to the same link line and "close the corresponding call path."
When the above-mentioned call state ends, the call is terminated, the corresponding TEU is selected and a recovery command is sent, and the corresponding SLU is selected and a recovery command is sent.
The exchange connection state is restored by “releasing the corresponding communication path”.

When these processes are completed, it is determined whether "information processing from all TEUs has been completed", and the "timer detection process" described later is performed.
After doing so, it "sends a command to start transmitting and receiving information with the MFT to all TEUs," and the above-mentioned terminal units TEU, ~TE
Data signals are sent and received between the TEU and the telephone rudder FT, ~MFTn, and if the answer to "Have all TEUs completed sending and receiving information with the MFT" is YES, then the time between "Check start" in FIG. The cycle ends.

In addition, (station line reservation) is to reserve the station line SL by pressing the station line selection button on the telephone MFT before off-hook of the telephone MFT, and in principle, the station line SL is reserved for the station line SL, ~ It is assumed that one of the SLs is not busy, and this (station line reservation) is performed when the telephone MFT is not off-hook within a certain period of time such as insect ec after pressing the station line selection button. It is automatically canceled.

In addition, in the case of an "extension call request," the voice line of the telephone that made the extension call is connected to the link circuit, and if there is no response within a predetermined time such as 3 seconds after calling the other party, the circuit In order to regulate these times, a timer is configured in the processor CPUm, and (station line reservation) starts the timer for a certain period of time.
Depending on the “extension call request,” a timer for a predetermined time starts, “selects the relevant SLU/TEU, sends an operation command,
” and “Select applicable TEU and send operation command”
In 'timer processing', each timer is stopped.

Therefore, “has information processing from all TEUs been completed?”
In the next "timer detection process", it is checked whether these timers have timed up or not, and the process proceeds to the step based on this assumption.

FIG. 6 is a flowchart showing the operations of the station line units SLU, -SLUM, which are executed by the processors CPUs according to instructions stored in their ROMs.

First, after "initial state setting", "station line state detection/processing storage" is performed, and "Selected from MCU" is YES.
In addition, "Do you want to send information to the MCU?" is YES.
If S, “send stored station line information to MCU”
and “Did you input the input completion signal from the MCU?” is YES.
If S, information sending ends.Also, if "Send information to MCU" is NO, "input operation command from MCU", and when this is completed, "send command input completion signal to MCU" In addition, the MCU executes its operation commands to close the loop and send dial pulses to the station line SL.
It is a flowchart showing the operation of ~TEUn, which is executed by the processor CPUt according to instructions stored in its own ROM.

First, after "Initial state setting", if "Selected from MCU" is NO, it is determined "Is there a command to start transmitting/receiving information with MFT?", and if this is YES, "Stored information to MFT is sent" is determined. Then, if the content is YES in the judgment of ``Is it necessary to send it to the MCU?'', then ``Is it necessary to send the information to the MCU?'', then ``receive and process the information from the MFT. ”, “MF to MCU”
Sends an information transmission completion signal with T.

Also, if “Selected from MCU” is YES,
Determine whether "MFT information is to be sent to the MCU", and if this is YES, the above-mentioned "MFT information to be sent to the MCU" is determined.
The contents stored in "Storing as information" are sent out by "Sending stored MFT information to MCU", and
When the question ``Did you input the input completion signal from U?'' becomes YES, the information transmission ends.

On the other hand, "Do you want to send the MFT information to the MCU?" is NO.
In this case, the command is input from the MCU, and when the command is completed, the command input completion signal is sent to the MCU.
After "input command processing" is performed, it is "stored as transmission information to MFT" and is held until the above-mentioned "M"transmission of stored information to T".

FIG. 8 is a flowchart showing the above-mentioned (office line reservation) operation in more detail, and corresponds to the (office line reservation) routine in the "office line call request" shown in FIG. In FIG. 8, one of the telephones MFTx reserves one of the central office lines SLY, and the terminal unit “TEU
Select x, input and analyze MFT information, and if YES is selected for “Is processing necessary?”, then this is the station line “SLY”.
If YES, the processor C
Each station line SL, ~SLm stored in the RAM of PUm
Based on the status of the station, check the status of the station line ``SLY'', and depending on the result whether it is busy or not, determine which stations can be reserved, and if YES, store the status of the station line SLY. Write the reservation information to the RAM address and connect the station line “S”.
Make LY status reserved.”

Next, the station line 'SLY's reservation timer which regulates the above-mentioned fixed time is started', and the terminal unit 'TEUx is selected and a station line reservation acceptance command is sent'.

Also, if the station line "SLY reservation" is NO, it means that the off-hook was made before the reservation timer timed out, and the station line "SLY status check" is performed.
The off-hook device determines whether the terminal unit that made the station line reservation is "TEUx", and if the answer is YES, it writes information about the call in progress to the address of the RAM that stores the station line SLY information, and transfers the station line. “Communicating SLY status”
Then, the station line "stops the SLY reservation timer". Next, the central office line unit "selects SLUy and sends a central office line closing command" to complete the central office line loop, and then controls the cross point CP to "close the corresponding communication path."
After that, a "timer detection process" is performed by checking the status of the reservation timer, and if "Reservation timer has timed out" is YES, it means that a certain period of time has passed without going off-hook after making a reservation for the central office line. After "selecting the TEUx that has reserved SLY" and 1' sending a reservation cancellation command to the TEUx, write the non-busy information to the address that stores the information of the station line SLY in the RAM, and then "state the station line SLY in an empty state." Note that if the results of the determinations on the "reservable power" and the terminal unit "TEUx" are NO, the process goes to (2) in FIG. FIG. 9 is a flowchart showing in detail the operation of automatically recovering after a predetermined time if the other party does not respond during an extension call, and corresponds to the "extension call request" routine in FIG. It is something.

FIG. 9 shows a case where one of the telephones MFTx makes a call to another telephone MFTy, and the main control unit MCU selects the terminal unit "TEUx" and calls the other telephone MFTy.
After inputting and analyzing Tx request information, it is determined whether processing is necessary, and if the result is YES, each terminal unit TEU, ~ RAM that stores the status of TEUn
After checking each address of the other party terminal unit TE
If “Non-busy” of Uy is YES, link circuit L,
Each address of the RAM storing the status of ~Lp is checked by the link circuit "L, ~Lp check", and if any of the addresses is "empty", then each terminal unit TEU, ~Lp provided in the RAM is checked. After storing information indicating that the terminal unit TEUx has made a call to the terminal unit TEUy through "extension call memory processing" in the extension call memory corresponding to the terminal unit TEUx corresponding to TEUn, a predetermined time is regulated. “Start extension ring timer”.

Also, if "Non-busy" is NO, the "response process" will send a busy tone, etc., and "stop the extension ring timer".
do.

Continuing from the above, if the other party's telephone MmTy is not busy,
The circuit is completed and the call state is established, but the "timer detection process" checks the status of the extension call timer,
When the "extension call timer timeout" is YES, the terminal unit "sends the extension call memo river release information corresponding to TEUx" and the terminal unit "clears the extension call memory corresponding to TEUx."

Therefore, the cross point C in the link circuits L to Lp
P restores the connection, and the link circuit and telephone M
Even if the connection with the voice line from the circle Tx is disconnected and other link circuits are in use by extension calls, subsequent calls can be made immediately.

In addition, the predetermined time for detecting non-response on the other party is
It can be determined according to the conditions, and the voice lines VL to VLn and the data lines DL to DLn are multiplexed into a two-wire system, or the cross point CP is connected to the terminal units TEU, ~T.
Various modifications are possible, such as providing it separately from EUn. As is clear from the above description, according to the present invention, when the other party of an extension call does not respond, the link circuits are not occupied for an unreasonable length of time, and a limited number of link circuits are effectively utilized. When making an extension call, the chances of being unable to make a call due to busyness are reduced, and great effects can be obtained in key telephone devices for various uses.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram of the entire system, Fig. 2 is a block diagram of the central office line unit, Fig. 3 is a block diagram of the terminal unit, and Fig. 4 is a block diagram of the main control unit. A time chart showing the information exchange operation between units and between telephones; Figure 5 is a flowchart showing the operation in the main control unit to execute the operation in Figure 4; Figure 6 shows the operation of the central office line unit. Flowchart, FIG. 7 is a flowchart showing the operation of the terminal unit,
FIG. 8 is a flowchart showing details of the central office line reservation operation, and FIG. 9 is a flowchart showing details of the operation of automatic recovery when the other party does not respond in an extension call. MCU... Main control unit, SLU, ~SLU
M...Station line unit, TEU, ~TEUn...
...terminal unit, M'T, ~MFTn...telephone, (button-type telephone), OAD... call regulation unit, SL~SLm... central office line, VL, ~ V
Ln...Voice line, DL, ~DLn...Data line, L~Lp...Link circuit, CPUm, CPUs, CP
Ut...Processor. Figure 2 Figure 3 Figure Boat Dimensions Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 a main control unit equipped with a processor; and a plurality of transmitting/receiving circuits that are connected to the button-type telephone via a voice line and a data line and transmit and receive data signals to and from the button-type telephone via the data line. A terminal unit provided corresponding to a button-type telephone;
and a link circuit for connecting extension calls between the button-type telephones provided between the respective terminal units,
A button telephone device in which the terminal unit and the link circuit are controlled by a processor of the main control unit,
In response to an extension call request received by the transmitting/receiving circuit from the button-type telephone that made the extension call, the voice line of the button-type telephone that made the extension call is connected to the link circuit, and the party to whom the extension call is made calling the other party and starting a timer for a predetermined time, and if the other party does not respond by the time the timer times out, the connection between the voice line of the button-type telephone that made the extension call and the link circuit is cut off. 1. An extension call control method in a button telephone device, characterized in that a processor of the main control unit performs each control.