JPS6159997A - Extension hand free response system - Google Patents

Abstract

PURPOSE:To prevent a call from being disconnected by a main wire incoming during an extension hand free call by including a hand free circuit in a telephone and providing a means to send a pseudo response signal to the main device in an extension hand free response. CONSTITUTION:A button telephone terminal includes a keyboard KB containing functional buttons such as a speaker call button for hand free setup and a mike-off button, a hand free circuit HDF, and a transmission circuit SRt sending or receiving control signals to or from the main device. The hand free circuit becomes in the operational status by receiving a control signal driving speaker receiving status sent from the main device according to an extension voice calling request and sends a pseudo response signal equivalent to that during operation of the speaker call button to the main device. When an extension voice calling is received, response status is automatically set with hand free and the status is reported to the main device.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for performing off-hook when receiving an extension voice call in a button telephone device including a main device and a plurality of button telephones (hereinafter referred to as telephones). The present invention relates to a system that automatically enables hands-free responses without having to use a computer.

[Prior art]

In recent years, there has been a tendency for hands-free functions to be added to telephones that are button telephone devices, making it possible to make calls using a microphone and speaker without using a handset.
To answer incoming calls free of charge,
Because off-hook is not performed, information indicating the response operation is not given to the main device. Therefore, the main device stores information that the called telephone has a hands-free function, and uses this information to connect the exchange. Hands-free responses are acceptable only when using a specific main device;
It has become inappropriate to connect a telephone with a hand 7 recovery function to any main device.

In other words, if a telephone with a hands-free function is connected to a general main device, and it is assumed that the phone makes a hands-free response to an extension call, the main device will not be given information that it is responding. When receiving a call from a central office line, a call is given to each telephone to notify the incoming call from the central office line. Therefore, the telephone that is answering by hands-free is judged to be still in the extension ringing state, and this is because the extension link The system is disconnected and switched to a ringing state for incoming calls from the central office line, and the answering call is disconnected and the hands-free circuit also stops functioning, which is extremely inconvenient.

[Summary of the invention]

The present invention has an object of fundamentally solving such conventional problems, and includes providing a hands-free circuit to a telephone, and a control signal for instructing the speaker listening state transmitted from the main device in response to an extension voice call request. A means is provided to activate the hands-free circuit and send a pseudo-response signal to the main device in accordance with the reception of the extension voice call.
An extremely effective system that automatically sets the hands-free response state and notifies the main device of this.
It provides an extension hands-free response system.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

FIG. 1 is a block diagram of the main unit KSU, and the accommodated central office line LI + L2 is connected to the main telephone unit m+, the switch key Kl + K2 with the TE station 2, and the switch key Kl + K2 between the main telephone unit and the telephone station 8. Telephone rack LI + rack 2 used as a telephone
3+ is connected to the dial circuit DIC+, DIC2 via K4 to the direct key for direct connection to LKt.
,1, connected to LK+,2.

In addition, the main unit KSU and each telephone storage L to ♂ which are omitted in the diagram
A pair of communication lines Lt, .about.LtB and a pair of signal lines LS, .about.L8. Extension links L are connected to each other by telephone terminals, and extension links L are used to carry out exchange connections between telephone terminals, telephone terminals, and mutual exchange connections.
Tone link LI (T provided by Yes, each communication line Lt, 1-Lt6 and each link LKL lr LKL2
There is a central office link LK between + LK■ + LKt.
Selection latching relay that selectively connects the communication lines Ltt to Lt8 to the t, + + LKL, 2 side and the extension link LK, and the tone ring, LKt side, respectively xs i
~xss contact X1ll°+ xst 1~xss°+
X88' is provided, and a contact XBI0 is connected between these contacts and the station line link LKLI + LI (L2).
＋XI! Each call IvllLtI~Lt8 is connected to the central office link LKt, +
+ Contacts XCI° of connection latching relays XCl-XC8 which are selectively connected to either LKL2.

xCIl~XC8°+Xe8' is inserted, contact X81
Between '+7:51'~xss°+X511' and extension link LKf and tone link LKt, each of the speech lines Ltl to Lts is similarly selectively connected to either extension link LK11- or tone link LKT. Connection relays Xll to XI8 contacts xix ' + xi
+'~xis°+X1g' is inserted.

In addition, latching relays XSI~XS8, XCI~
XC8 and relays XII to XI8 are each provided in correspondence with the telephone equipment, and the latching relay XS
When I to XS8 select the central office line link LKL1 + LKr-2 side, depending on the status of latching relays XCI to When XSI to XS8 select the extension link LKt:Th and tone link LKT side, depending on the operation or recovery of relays XII to XI8, the telephone stack 1 - δ is connected to the extension link LKr or tone link LKT, By supplying telephone power by the transformer TL, the telephone T E L I'=, T
Calls are made between the E L 6 and the door phone DRP (not shown in the figure) via the door phone circuit DPC, and the tone link LK
When the telephone is connected to T, the telephone can receive a call from another telephone by turning on the switch circuit SW.

Moreover, for the office line Ll+L2, the switching key Kl is pressed.

3. to Kz and direct key. An incoming call detection unit RDT for detecting the arrival of a paging signal is bridge-connected to K4, and a hold relay H1 is connected between the dial circuits DICI, DIC2 and the office line links LKLI r LKzz.
゜H2O contact h l' + h r ' + h2°,
hz'hyo0'Km Blood resistance vessel for loop closure R1r R
2 are connected in parallel, and at the same time, the operation of relays H1 and H2 holds the station line Ll * L2.
The hold tone from the hold tone generator HTG is sent out via the capacitors C1l to C2.

Note that the dial circuits DIC, DIC2 are connected to the station t.
Depending on the conditions of ilL+ and L2, when a pulse signal is used as a dial signal, a circuit that sends out a pulse signal by turning on and off a DC loop is used, and when a composite audio frequency signal is used as a dial signal, a circuit is used that sends out a pulse signal by turning on and off a DC loop. A circuit is used that is operated by electric current and sends out a complex audio frequency (N signal).

On the other hand, a processor CPU such as a microprocessor.

A control unit CNT consisting of a fixed memory ROM, a variable memory RAM, etc. is provided, and the processor CPU executes instructions stored in the fixed memory +7 RAM and performs control operations while accessing predetermined data to the variable memory RAM. transmission section SR via interface 1/F.
By exchanging data with the terminal, it accepts operation data from the telephones TEL1-TELg via the signal lines Ls+ to L5g, and also receives the detection output of the incoming call detection unit RDT and the operation signal from the intercom circuit DPC. It makes a control decision in accordance with this and sends control data for the telephone equipment to the transmission unit SR, and also transmits the two switching relays XSI to XS8, XCI to XC8, relays XII to XI8 and Ml.

R2, dial circuit D I C1 + D I C2, hold tone generation section) (TG, controls switch circuit SW and door phone circuit DPC, etc., and controls telephone equipment + to T E L 3
It performs switching connections, sending out dial signals, and placing calls on hold in response to operations.

Note that the good news signal AL from an external door switch, fire detector, etc. is also given to the interface rA, and in response to this occurrence, the processor CPU sends control data to the telephone equipment I to TKLI. In addition to sending out a notification sound, an external buzzer Bzt- is sounded via the interface I/F' to issue an alarm.

In addition, the commercial power supply AC via the power switch swp is stepped down, rectified, and stabilized in the power supply section ps, and then +1
9V, +12V, +SV, etc. are supplied to each part as DC power, and the telephone Tl1l:L, ~.

Also, in the transmission section SR, the signal line L8. ~Ls8
A DC power supply of +19V is supplied to each individual via.

However, a volatile variable memo that stores important data for control! For J RAM, backup battery B
It is equipped with an AT, so that even in the event of a power outage of the commercial power supply AC, the stored contents are retained by the backup of the battery DAT.

In addition, certain power outage telephone equipment I and No. 2 are equipped with dial circuits operated by loop current through the telephone line Lttr Ltz, one for pulse signals and the other for complex audio frequency signals. In this case, if a telephone set for pulse signals is connected to a central office line that uses composite audio frequency signals as dialing signals, and a telephone set for composite audio frequency signals is connected to a central office line that uses pulse signals as dialing signals, a power outage occurs. In this case, it will be impossible to make dial calls from each office line, so a switch Kp for switching the office line connection is provided, and when operated, the latching relays XCI and XC2
is controlled, and the telephone meter and TgLz are connected to the corresponding office lines.At the same time, the latching relay DU for holding is also controlled, so the commercial power AC
In response to the energization of the processor CPU, the latching relay D
After checking the state of the contact du of U and determining whether or not the switch Kp has been operated,
When operated, the data indicating the status of the latching relays XCI and XC2 stored and held in the variable memory RAM is modified.

In addition, a setting section FST is provided, which sets special conditions such as incoming call restriction for each of the telephone stations L to S, and sends the output thereof to the control section CNT, depending on the setting situation: BLJ control is to be carried out.

FIG. 2 is a front view of the telephone set. An operation panel 2 is provided on the right side of the mounting section of the handset 1, and above this is a volume adjuster 3 for speaker reception and ringing.
, 4 are provided, and automatic dialing buttons 51 to 5101 are provided on the front side of these lines.
Setting the hands-free state [Speaker call - Operate 1 button T1 "Hold" button 8, "1-1 to "0" and "S", "S" dial buttons 9, "Speaker call" button/7 A "microphone off" button 10 that turns off the microphone and sets the speaker listening state when the hand state is set, and other function buttons 1.
1 are provided, and among these buttons 61 r 62
+7.10 corresponds to each indicator light 12+~12
4 is provided, and the lighting of the indicator lights 12+ and 12g indicates that the station line Ll r L2 is busy, and the blinking indicates an incoming call.
The hands-free state is indicated by turning on the indicator lights 12g and 124, and the speaker-receiving state is indicated by turning off the microphone.

Note that each button is of a non-locking type, and a predetermined state is set by operating each button 6t+6z+7, 8.10, and the predetermined state is canceled by re-operating.

FIG. 3 is a block diagram of the telephone equipment, and a telephone line terminal TT connected to the telephone line Lj is connected to a telephone circuit TKC including a hand controller via a hook switch H8' and a dial circuit DIC. In response to off-hook, the direct current loop is closed by the telephone call circuit TKO, and dialing by the dial circuit DIC which operates using the loop current as a power supply and telephone calls by the handset can be performed.

However, the dial circuit DIC is controlled by the power failure detection circuit PDD, and becomes operable only when the commercial power supply AC used on the main unit KSU side is out of power.

In addition, the break pole of hook switch H8' and the contact rZ of relay RL, which is connected to the root zone in response to a power outage of the commercial power supply AC.
A tone ringer TRG is bridge-connected to the tone ringer TRG, which is operated by its power in response to the arrival of a calling signal, generates a ring tone, and supplies it to the speaker SP via the contact rt2 to drive it. At the same time, the contact r
A hands-free circuit HDF is connected through the makeup cup of the Z+, and a hands-free call can be made using the speaker SP via the microphone M and the amplifier A when on-hook.

On the other hand, a power supply circuit Pst is connected to the line terminal TS to which the signal line Ls is connected, which stabilizes the power supplied from the main unit KSU and supplies it to each part as a local power supply E. Although similar to the control unit CNT of the KSU, the control unit CT, which is more irregular, is also operated by the local power supply E.

The power failure detection circuit PDD monitors the voltage drop of the local power supply E, thereby detecting a power failure of the main unit KSU side commercial power supply AC, restores the relay RL, and causes the tone ringer TRG and speaker SP to notify the incoming call. It is possible.

A transmission circuit SR5 is also connected to the line terminal TS, which detects a drop in line voltage in response to the transmission from the main unit KSU, and provides this as received control data to the control unit CT. Resistors are connected between the signal lines and the lines according to the operation data from the line, thereby lowering the line-to-line impedance and transmitting by lowering the line-to-line voltage.

Therefore, signals are transmitted and received with the main unit KSU via the transmission circuit SRt, but the control unit CT is provided with outputs from the keyboard KB by the hook switch H8'' and the buttons shown in FIG. Then, output changes corresponding to these operations are detected, and operation data based on this is encoded and transmitted as a transmission signal as described above.

Further, the control unit CT includes each indicator light group PL in FIG.

Switch circuits SW1 to SW1 using analog switch circuits
'w3, amplifier A1, tone generator TG that generates various signal tones, and external loudspeaker EX via terminal board TB.
A, etc. are controlled according to control data or the operation of the keyboard KB, and depending on the operation of the "speaker call" button, the switch circuit S is controlled according to the corresponding control data.
At the same time as turning on W, , sw2, amplifier A is set to the operating state and a hands-free state is set, and if the "microphone off" button is operated at this time, the switch circuit SW! is turned off and the speaker is in listening mode.

On the other hand, when sending out various ring tones and alarm sounds, the tone generator TG is controlled, the switch circuit SW3 is turned on, and the amplifier A is activated, and the frequency f142 and the on/off frequency corresponding to the control data are turned on and off. The off-period signal tone is the speaker s
Sent from p.

In addition, the control units CNT and CT control the judgment vfr described later.
While performing trigrams and control, in the event of a power outage of commercial power AC,
Telephone engineer for power outage] + station 2 is station i in main unit KSU
! 11LII L2, and in this case, the dial circuit DIC becomes operational as described above, and calls can be made and received from the office line L1 or L2.

However, the dial circuit DIC,)-ringer TRG.

Relay RL and these peripheral circuits may be provided only at power outage telephone station z. It is a diagram showing the transmission status, first,
Polling signal PR from main unit KSU to telephone post
will be sent and the phone postfix will be sent accordingly.

When a response signal X indicating operation data is transmitted from the main unit KSU, the main unit KSU responds to the reception of the response signal X indicating the operation data.

A control signal Y indicating control data is transmitted to the terminal, and these transmissions and receptions are also performed sequentially to the telephone terminals 1 to 3, and the above transmission and reception is recovered at a fixed period t.

FIG. 5 is a waveform diagram showing details of a series of polling signals PR to control signals Y. In transmission from the main unit KSU, the line voltage V of the signal line La decreases by V, whereas the line voltage V of the signal line La decreases by V.
The transmission from the telephone device (?f is the line voltage V) is reduced by only v2.

Here, the polling signal PR consists of a 3-bit pulse signal, and the response signal X includes a 2-bit start signal ST, a synchronization bit SY, data bits D, -D, and a harness bit PY. A byte consisting of X1. It is composed of X2, and data pi! -D
o"Ds is coded according to the operating situation, and insertion or non-insertion of the data bit Do=Dq is determined accordingly. For example, insertion indicates a logical value of "1",
In addition to indicating the same 0'' due to non-insertion,
1st byte X1! liI! In the case of 2 bytes There is.

The control signal Y includes a 2-bit start signal ST, a synchronization bit SY, a data bit (Do to D6), and a 2-bit start signal ST.
Bytes Y1 to Y3 consisting of harness bits PY form the bottom of the tank, and a total of 21 data bits are defined as corresponding to each control item, and for example, a logical value is indicated in the same way as described above depending on insertion or non-insertion. and this logical value is ”
The control item is set to be executed in accordance with 1'.

Therefore, the telephone operation data is indicated by the codes of Pi)Xi and The correspondence relationship between the data bits Do to D6 is determined, for example, as shown in the following table.

Therefore, control data is indicated by data bits D and %D of pi 1-Yl to Y3 corresponding to the control item, and the control unit CT of the telephone sets the order of each byte Y1 to Y3 and data bits Do to D6. Control in accordance with the control data can be performed by simply counting the number and determining its state, thereby simplifying the procedure for decoding the control data.

Note that when decoding the control data, the start signal ST
and synchronization pin) performs counting based on SY,
The presence or absence of an error is determined by the parity bit PY.

In addition, in the main unit KSU, each received pie)
,

After detecting that X2 is a regular signal, a corresponding response is taken.

However, in the main unit KSU, as mentioned above, the received signal
If an error is detected, the transmission of the control signal Y is stopped and the process moves on to transmitting the polling signal PR to the next telephone, and the telephone transmits the response signal X.
If the control signal Y cannot be received within a certain period of time after transmitting, it is determined that an error has occurred in the own transmitted signal,
When the self-addressed polling signal PR is received in the next period t, a response signal X indicating the same operation data as the previous time is retransmitted in response.

FIG. 6 is a flowchart of the control situation by the processor CPU of the main unit KSU.
"101 transmits and receives data as shown in Figure 4, sets the telephone counter to "IL←1°'102 to telephone TER=, and checks the operation data received and stored in the town change memory RAM." Individual extension call?” 111 is called or not. If YES, variable memo +7 Checks 112, “Called side busy?” according to the contents of the RAM, and this is YES.
In the case of S, "busy tone command data set to the calling telephone" 113 is performed to the buffer area of the variable memory IJ RAM which stores the control data to be transmitted next time.

On the other hand, if Step 112 is No, it is determined that the content of the call is "Tone call?" 121, and depending on YES, a tone call command data cellar to the called telephone is sent. :After performing, variable memory RA
Performs "Update Called Telephone Status" 123 during M,
Update the status data of the called telephone to called.

If step 121 is also NO, it is a voice call, and the "voice call command data set to called telephone" 13
1, the calling telephone and the called telephone are connected to the extension link LK (132), and the communication path is established, before proceeding to step 123.

As described above, the processing when the telephone postfix makes a call is completed, and then the processing when the telephone postfix I enters the called state is performed.

That is, according to the status data in the town memory RAM, "Extension being called"? 141 is checked, and this is Y.
If it is ES, the received “operation data is a subika call?”
142, and in response to YES, the "voice pass-on command data set" 143 and 1 is sent to the pamphlet area.
After carrying out step 144 of ``Amplifier operation command data (7)'', the status data of the telephone device is updated to ``in-extension call'' in step 145 of ``status update''.

Also, if step 142 is No, check ``Is the operation data another extension response?'' 151, and if this is YES.
If S, it is judged as an off-hook response, and step 1
After connecting to the extension link "LK+" 152t- in the same manner as in step 32, the process moves to step 145.

On the other hand, if step 141 is NO, check "Extension call in progress?" 161 according to the status data, and if this is YES, same as in step 142, ° operation data is speaker call? 162, and if it is YES, the call is terminated by operating the speaker call button T again, and the extension link ``LK, release'' 163 is performed.
After the status data is set to non-busy by "Status Update" 164, "Voice Pass-off Command Data Set" 165 and "Amplifier Disable Command Data Set" 166 are sent to the buffer area.

In addition, depending on No in step 162, is the 1 operation data off-hook? If the check is YES, the process moves to step 164 because the call is being switched from a free hand call to a call using a handset.

When the above processing is completed, “Other reception processing 1181
and “telephone counter +i” 1132,
As long as the content of this is NO in "Place=9?" 183, steps 111 and subsequent steps are repeated, and if step 183 is YES, station line L 1 +L2 is determined by "n station line processing" 184.
After performing call control for the terminal, steps 101 and subsequent steps are repeated at the cycle t in FIG. 4.

Therefore, in the next step 101, one of the data bits D4 to D6 of the byte Y1 and the data bit Do of the byte Y2 are selected according to the step 113.
+ DI is inserted, and so on by step 122, and by step 131 data bit D2 of pi) Yl and data gut D, -02 of byte Y2.
is inserted, and in response to steps 143 and 144, data bit D2 of byte Yl and data bit D2 of byte Y2 are inserted, step 165
, 166, these respective data bits are not inserted and are sent to the calling telephone in response to step 113 and to the called telephone in response to the other steps.

Therefore, step 113 causes the calling telephone to receive a busy message, step 122 causes the called telephone to transmit an extension ring tone, and step 131
and 132, the voice from the calling telephone is transmitted from the speaker of the called telephone and the external loudspeaker.

Further, in step 131, a control signal instructing the speaker to listen is transmitted, so that the hands-free circuit HDF of the called telephone enters the operating state as described later, and a hands-free call is performed, and in step 145, the called telephone The telephone is treated as being busy, and this state is released by steps 165 and 166.

Note that the determination in step 142 is made not only when the speaker call button T in FIG.
The answer will be YES.

In addition, extension calls can be distinguished, for example, by off-hook and dialing the called telephone number, an individual voice call is made, off-hook and dialing the called telephone number twice, an individual tone call, and off-hook and dialing a specific number. This is defined as voice-all call, and the decision is made according to the combination of these operation data.

FIG. 7 is a flowchart of the control situation by the processor provided in the control unit CT of the telephone device, whereby each of the seven lags is reset to set 0, and a separate interrupt process by the timer is performed according to the state of the flag. Control is executed.

In FIG. 7, the signals shown in FIG. 5 are transmitted and received by the "transmission process" 201, and if the received "control data is an amplifier operation command?" 211 is YES, the "amplifier flag (7)" 212 is sent and received. If it is NO, perform the ``Amplifier Flag Set'' 213, and then do the same ``Is the control data an audio pass-on command? '° 221 is judged, and in response to YES, performs "audio path flag set 222", and in response to NO, "audio path flag reset" is performed.
223, and the 7 control data is also an external device operation command? If ``°231'' is YES, 1 External Device Flag Sera) 232 is executed, and if NO, ``External Device Flag Reset'' 233 is executed.

Then, after performing "other reception processing" 241,
``Hands-free state?'' 242 is checked according to the hands-free flag described later, and if this is NO, it is determined whether the flags in steps 212, 222, and 232 are set to indicate ``Extension voice called state?''. 243, and as a premise, set the speaker call data to the 6 transmission buffer area of the variable memory that stores the operation data to be transmitted next time. ″2
After performing step 52, “Hands Free Flag Set”
Step 253 is performed, and steps 201 and subsequent steps are repeated in response to reception of the polling signal PR.

Then, step 24 is performed in response to step 253.
2 becomes YES, and according to steps 211 to 223 "
Amplifier flag set? 261 and “audio path flag Φ set?” 262, and if these are YES.
If so, steps 201 and subsequent steps are repeated to maintain the hands-free state, but steps 213 and 223 are performed in accordance with steps 165 and 166 in FIG. 6 when the call ends.
is executed, step 261 or 262 becomes No, and after performing ``Speaker call data transmission flag reset'' 2γ2 via YES of ``Speaker call data transmission flag set?'' 2γ1 corresponding to step 252, As in step 251, after setting the speaker call data n213 to the transmission buffer area,
1 Hand-free flag tatami reset ``2γ4'' is performed, and steps 201 and subsequent steps are repeated.

Therefore, if Step 121 in FIG. 6 is No and the calling telephone makes an extension voice individual call request, the called telephone is the seventh
Step 243 in the figure becomes YES, and in accordance with step 251, when the speaker call button 7 is operated, data equivalent to '' will be transmitted as a pseudo response signal (K), and in accordance with step 253, the switch circuit SWl is turned on. , at this time, steps 212 and 22 have already been completed.
2, the amplifier A is in the operating state and the switch circuit sw2 is also on, so the peripheral circuit of the hands-free circuit ■π is completed, and hands-free calls can be made freely using the microphone M and the speaker SP via the communication line Lt. Become.

If there is a risk that the use of an external loudspeaker system in conjunction with a 7-point voice call may interfere with a 7-way voice call or an external loudspeaker system, use the external loudspeaker system (
6. It is sufficient if it is not disguised as a joke.

Furthermore, when the call is terminated due to the on-hook of the older brother's telephone, an amplifier deactivation and voice pass-off command is sent as control data 1G, and steps 2B1 and 2B are performed accordingly.
62 becomes No, and the pseudo response signal is transmitted again in step 273 via YES in step 271, so 1. The recovery state is reached by steps 163 and 164 in FIG.

FIG. 8 is a flowchart of interrupt processing by the processor of the control unit CT, which is executed at a cycle of, for example, 5m5ec by a timer configured in the processor.

That is, the keyboard K1 is detected by "operation detection" 301.
1l, - and 7 switch H3" is detected, and the status of "Button operation?" is detected. If "302 is YES," 311 is performed "to send button data to send buffer area" according to the operated button, and corresponding to step 253 in FIG. 7, "hands-free state 'i'" is executed.
Check 312 1. If YES, the content of step 311 will be "Speaker call button data?" 31
3, and if the answer is YES, it is determined that the speaker call is to be canceled, and steps 272 and 27 in FIG.
4, "Speaker call data transmission flag reset °" 321 and "Hands-free flag reset I-"
” Do 322.

Also, when step 302 is NO, the operation checks "Off-hook data °" 331, which is YES.
If so, send off-hook data to the 6 transmission buffer area.
After performing the set "" step 332, steps 321 and subsequent steps are executed since the transition is from a handset-free call to a handset-set call by off-hook.

On the other hand, in response to No in step 331, it is determined that it is on-hook, and "on-hook data set to transmission area" 333 tl- is performed.

After performing each of the above processes, click "Other data processing"
After processing such as setting operation data corresponding to each button operation in the transmission buffer area is performed in step 341, "each part drive" step 342 is performed according to the state of each flag, and the process returns to the main routine.

Therefore, by operating the speaker call button 7 again, operation data indicating this is transmitted, and step 16 in FIG.
2 becomes YES, and the recovery state is entered in steps 163 to 166. On the other hand, when off-hook during a call, operation data indicating this is transmitted, and step 171 in FIG. 6 becomes YES, and steps 164 to 166 166
Therefore, the extension link "LKs release" in step 163 is not performed, and the telephone conversation using the handset continues.

Note that when making an extension voice call, step 13 in Figure 6 is also performed.
Similarly to 1, the control data of "amplifier operation command", "audio noise ON command", and "external equipment operation command" are transmitted, and in response to this, step 243 in FIG. 7 is made YES, and step 251 A pseudo-response signal is sent by the main unit KSU, but the response to the extension voice call is by off-hook and dialing a specific number, and the pseudo-response signal at this time is invalidated in the main unit KSU. Ru.

fc circle. In the above case, the control signal that commands the speaker listening state has three conditions that overlap: "amplifier operation command,""audio sound on command," and "external equipment operation command," and other controls do not work. Since these three conditions do not overlap, it is easy to distinguish on the telephone device side, but if there is something in the control data that indicates an extension call, this can be used in place of the "external device operation command" °. Good too.

Therefore, by transmitting a specific control signal from the main unit KSU, the hands-free circuit HDF of the called telephone becomes operational, and a pseudo response signal is transmitted as operation data, so that the main unit KSU responds accordingly. In this case, the response of the called telephone can be recognized, and the central line LI
The extension line communication path is not disconnected in response to an incoming call from +L2, and the line communication state is maintained.

In addition, the main unit KSU only needs to be able to identify pseudo-response signals, and there is no need to remember telephones with a hands-free function, and it is possible to connect a telephone with a hands-free function to any main unit KSU. Become free.

Note that the pseudo response signal is not limited to one that corresponds to the operation of the speaker call button 7, but may also be the same as one that corresponds to the operation of the loudspeaker button, etc. The configuration of 2+ can be arbitrarily selected depending on the conditions, and the transmission means shown in FIGS. 4 and 5 can also be determined depending on the situation. In FIGS. Various modifications are possible, such as interchanging steps, replacing steps with other equivalent steps, or omitting unnecessary steps.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, any main device can be freely combined with a telephone having a hands-free function, and hands-free responses to extension voice calls and telephone calls can be performed normally. A remarkable effect is obtained in a button telephone device.

[Brief explanation of the drawing]

1 is a block diagram of the main device, FIG. 2 is a front view of the telephone, FIG. 3 is a block diagram of the telephone, and FIG. 4 is a diagram showing the signal transmission situation. FIG. 5 is a signal waveform diagram, FIG. 6 is a flowchart of the control situation by the processor on the main device side, and FIGS. 7 and 8 are flowcharts of the control situation by the processor on the telephone side. KSU... Main unit, position, ~ position 8... Telephone (key telephone), CNT, CT... Control unit, CPU@
...processor, SR...proboscis/transmission section, LK+...
・Extension link, LLx-Lts, Lt...Talking line, "81~L3g + L3...Kimigo line, H
8', H82...Hook switch, HDF'-・War/hand-free circuit, SRt middle/pa/transmission circuit, SWl
~Hata 6...working switch circuit, KB...keyboard, MIll/war microphone A a electric/e amplifier, sp...speaker.

Claims (1)

[Claims] In response to an extension voice call request from the calling button telephone that made the call, the main device transmits a control signal instructing the called button telephone to set the speaker listening state, and according to the control signal, the called button telephone In the button telephone device, which sets the speaker receiving state and drives the speaker by the received voice from the calling button telephone that comes through the telephone line, the transmitting voice from the microphone is transmitted to the telephone line when on-hook state. and means for setting the hands-free circuit in an operating state on the premise that the extension voice call state is in response to reception of the control signal and transmitting a pseudo response signal to the main device. An extension hands-free response system that is featured in key telephones.