JPH01314465A - Call time limiting system for telephone set - Google Patents

Abstract

PURPOSE:To effectively prevent a long telephone call by limiting a call time and prohibiting re-transmission for a constant time when the call is forcibly disconnected according to the passing of the limiting time. CONSTITUTION:When a calling person hung up a transmitter and a handset 7 and a hook switch 6 is closed, an MPU 8 judges whether a timer TM is set or not. When the timer is not set, a direct current loop is closed to a telephone line l and the telephone line l is closed. When a called person executes a response, the timer TM is set for the specification of the call time and time counting is started. When the timer TM counts a first setting time t1 before the end of the call, a previous notice tone is sent to the transmitter and receiver 7 and after that, the direct current loop is closed. When the handset is off-hook again and the timer TM does not count a second setting time t2, transmission is impossible.

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention is a call time limit system that prevents long calls (% type %) (Prior Art) To prevent long calls, conventionally, telephones display call time and minutes. In some cases, the telephone line is forcibly disconnected after a set time has elapsed after starting the call.

[Problems to be Solved by the Invention] According to the above-mentioned conventional methods, in the method of displaying the call time, the call itself continues as it is, and in the method of forcibly disconnecting the telephone line, the call is terminated by making the call again after disconnecting. However, there are some areas where the regulation of call time is not strict enough.

SUMMARY OF THE INVENTION The present invention aims to solve the above problems and provide a call time restriction system that allows for more thorough control of call time.

[Means to solve the problem]

In order to solve the above problems, the present invention performs a timing operation after entering the call in an outgoing call, and after a certain period of time has elapsed, sends out a line disconnection warning sound and then forcibly disconnects the telephone line during the call (call (regardless of the person's will), the telephone that was making the forcibly disconnected call will not be able to make a call until a certain period of time has elapsed, and the primary purpose is to save on call charges. From the viewpoint of communication, the callable time (the time from the start of a call until the line is forcibly disconnected) is set to differ for each predetermined calling area, and furthermore, considering operational convenience, the callable time (the time from the start of a call to the forced disconnection of the line) is set to be different for each predetermined call destination. The above call time limit is not imposed.

[Function] The central processing unit (CPU) of the telephone or telephone device detects a response from the callee and starts timing, and when the first set time has been counted, it sends out a line disconnection warning sound and terminates the call. The telephone line is forcibly disconnected, and subsequent calls are prohibited from being made again from at least the telephone that was making the forcibly disconnected call until a second set time is counted. The above operation forces the caller to interrupt the call for a long time, making it possible to more effectively prevent a long call.

[Embodiment] Fig. 1 is a block diagram of an embodiment in which the present invention is implemented in a single telephone (hereinafter referred to as the first embodiment), and Fig. 2 is a block diagram of an embodiment in which the present invention is implemented in a single telephone device, etc. A block diagram of an embodiment implemented in a housed telephone device (hereinafter referred to as the second embodiment), FIG. 3 is a flowchart showing control of the first embodiment, and FIGS. 4 and 5 show the second embodiment. 3 is a flowchart showing the control of FIG.

The telephone device according to the first embodiment, as shown in FIG.
a warning sound sending unit 3 that sends a warning sound prior to forcibly disconnecting the telephone line 1, the dial 2, and the telephone line 2 during a call;
A response detection unit 4 that detects the response of the called party, a telephone port is J
2, a line opening/closing control unit 5 that controls the opening and opening of the telephone, a hook switch 6 that detects the off-footer of the telephone device, a handset 7,
It is composed of a microprocessor unit (hereinafter referred to as MPU) 8, etc., which collectively controls the telephone equipment using a program.

The notice sound sending unit 3 is constituted by a special signal sound oscillator or a voice synthesis circuit, and the notice sound is sent out as a special signal sound or voice.

The response detection unit 4 detects the response of the called party by detecting that the polarity of the telephone line l is reversed due to the called party's response. Furthermore, for a telephone line to which no called party response information due to polarity reversal is sent, the called party's response is detected by detecting the disappearance of the ringing tone (so-called ringback tone).

The line opening/closing control unit 5 is constituted by, for example, relay contacts that open and close a DC loop with respect to the telephone line 1.

The MPU 8 is mainly composed of a so-called one-chip CPU, and according to the present invention, receives the called party response information from the response detection section 4, sets a timer TM, and uses the timing operation of the timer TM to set the timer TM. 3 and line opening/closing control unit 5
Performs processing according to a pre-installed program, such as controlling the computer.

The operation of the first embodiment will be explained according to the processing flow shown in FIG.

The MPU 8 constantly monitors the state of the hook switch 6 (step ■), and when the caller picks up the handset 7 and closes the hook switch 6, the MPU 8 sells this 8 and sets the timer TM to the MPU 8 in step ■. Determine whether or not it remains set. If the timer does not remain set here, as you will understand later in the explanation, it means that the telephone line was not forcibly disconnected in the previous call, and in step The MPLJ 8 controls the line opening/closing control unit 5, closes the DC loop for the telephone line k, and closes the telephone line °C.

As a result, a dial tone is sent from the telephone line ℃, so the caller listens to the dial tone on the handset 7 through the communication circuit 1, knows that it is possible to make a call, and then dials the number of the destination. Dial 2 to dial the telephone line
Send to.

After the telephone line is closed, the MPU 8 monitors the called party's response and the calling party's on-footer by the response detection unit 4 (steps ■, ■), When the person answers, the polarity of 9° C. is reversed or the ringback tone disappears), and the response detection section 4 detects this and sends response information to the MPU 8. MP
When the U8 reads the response information from the response detection unit 4, it sets a timer TM for regulating call time by the program in step (3), and at the same time starts measuring time by the timer TM.

The time regulation by the timer TM is performed to both limit the call time and prohibit re-calling, and the time t1 and the time t are set respectively.
2 is set.

After setting the timer TM and starting the timing operation, the MPU
Reference numeral 8 uses a control loop that cycles through steps ① and ② based on the information from the timer TM and the hook switch 6 to monitor the call time and monitor whether the caller has finished the call.

When the timer TM measures the first set time t1 before the caller puts down the handset 7, that is, before the end of the call, the MPU 8
starts the warning sound sending section 3, sends out a warning sound (a special signal or a warning sound by voice synthesis) to the handset 7, and then controls the line opening/closing control section 5 to generate a warning sound for the telephone line ρ. (step [phase]
). This means that the telephone line λ is forcibly disconnected.

When the caller ends the call (on footer) before the first set time t1 elapses with the timer TM, that is, the MPU 8 reads that the hook switch 6 was opened before the first set time 11 is measured by the timer TM. Then, the MPU 8 advances the control in the direction of ``YES'' based on the judgment in step ■.
After clearing the timer TM in step 0 (after canceling the setting of the timer TM), in step [phase], the telephone line °C is released.

In addition, if the called party is busy or absent and there is no response, and the calling party abandons the call and goes on-hook, the M
The PU 8 detects the above-mentioned on footer when the hook switch 6 opens, and controls the control in step ``YES''.
”, and in step [phase], the process of opening the telephone line is performed.

The control is performed in steps ■ and ■ using the operations described above.

If the timer TM is advanced to [phase], the timer TM set in the MPU 8 is not cleared, and the timer TM continues to be counted even after the first set time has been counted in step (3). (After setting the clock time to zero on -1, the clock immediately restarts.) If you go off-hook again in this state, this timer TM
remains set, the MPU 8 detects the off-footer from the hook switch 8 and then controls the steps ■, ■.
, @, and in step @, it is determined whether the timer TM has already counted the second set time t2. Here, when the timer TM has not counted the second set time t2, it becomes impossible to make a call (step @). That is, even if the MPU 8 is off-hook, the line opening/closing control unit 5 does not control the closing of the telephone line. Also, timer T
When M has already clocked the second set time t2,
The control proceeds in the direction of "YES" in the judgment of step ■, and after clearing the timer TM in step [phase], the line opening/closing control unit 5 is controlled to close the telephone line 1 (step ■), and thereafter, The control explained above is repeated.

In the second embodiment, as shown in FIG.
This is implemented in a button telephone device consisting of a main device ME and a main device ME.

The telephone equipment, equipment 2, and so on are connected to the main device ME by a telephone line It1, which mainly serves as a voice transmission path, and a control line FTB, which serves as a transmission path for various control data. )° C. is connected to the main device ME, and the telephone line 2 is shared by telephones i, z, and so on.

Telephone stations 1, 2, . Dial 2. Hook switch 6, handset 8
and a microprocessor unit (hereinafter referred to as MPU) 8, and a call loop control unit 9 (similar to the line opening/closing control unit 5 of the first embodiment) that controls opening and closing of the call loop for the call line λ1. ), a control line interface 10 for exchanging control data with the main device ME via a control line. It has a signal tone transmitter 11 for transmitting a dial confirmation tone, an outside line dial tone, etc. to the handset 7, and a dial memory 12 for storing dial number information transmitted by the dial 2 for at least two times.

In this embodiment, the dial signal is sent to the telephone line 1 by a so-called sender method, and dial number 48 is not directly output from the dial 2, but dial data is output.

In addition, the main device ME is connected to the telephone equipment 211, 212, 211, 212, 212, 212, 211, 212, 212, 212, 212, 212, 212, 212, 212, 212, 212, 212, which is the interface to the telephone line, the external line trunk 22 which is the interface to the telephone line,
A call path switch 23 that connects and controls the call path between the extension circuits 211, 212, .
A dial sender 25 converts the dial data received from the telephone equipment, □ equipment 2, etc. into a dial signal and sends it to the telephone line °C, for example, it is a dial sender 25 that converts the dial data received from the telephone equipment, □ equipment 2, etc. into a dial signal and sends it to the telephone line ℃. Calling destination/calling allowable time comparison table (hereinafter referred to as comparison table) 26 that stores comparison data with callable time and regulations for registering destinations that do not limit call time and prohibit re-calling immediately after a call ends. A microprocessor unit (hereinafter referred to as MPUT) that collectively controls the external destination registration memory (hereinafter referred to as registration memory) 27 and the main device ME by a program.
That's what it means. )28.

The extension circuits 21□, 212... are all configured the same,
Regarding the present invention, a control line interface is provided for exchanging control data with the telephone equipment 2, etc. via the loop monitoring unit 21A that monitors the opening/closing of the call loop of "c" and the control line Ilt. 21B.

The outside line trunk 22 has a response detection section 22A and a line opening/closing control section 22B similar to the response detecting section 4 and line opening/closing control section 5 of the first embodiment according to the present invention.

The MPUM 28 is mainly composed of a so-called one-chip CPU, and according to the present invention, based on the dial data from the telephone equipment, telephone equipment 2, etc. , , control of transmission to position 2..., opening/closing control of telephone line 1, detection of the called party's response and control of transmission of response information to telephone TEL, , position 2..., telephone of disconnection warning tone Place,.

, etc., transmission control of the dial signal to the telephone line, control of setting of the communication path by the communication path switch 23, and various other monitoring controls, etc., are carried out according to a predetermined program.

The flowchart shown in FIG. 4 shows the MPUM of the main device ME.
28, and the flowchart shown in FIG. 5 is for the telephone device.

12 is a flowchart showing the processing in MPUT 8 of the following locations.

The operation will be described below assuming that a call is made from a telephone device to a telephone line λ. In the following explanation, step numbers ~[phase] refer to the steps shown in FIG.
Phases ] to ■ represent the steps shown in FIG. 5, respectively.

The MPU of the main device ME is the extension circuit 211゜212...
A constant telephone call is made via the control line interface 21B and the control line 1b of the I! aTEL 1. The call from station 2... is monitored (step ■). In addition, there are telephone places, places 2 and 2.
...'s MPUt8 also constantly monitors the off-footer using the hook switch 6 (step @).

When the handset 7 is picked up at the telephone station and the hook switch 6 is closed, i.e. off-hook, the MPIJ
T8 reads this and sends the calling information to the control line text via the control line interface 10 (step 2). Next, the MPUT 8 determines whether an external line selection button (not shown) has been pressed on the telephone meter (Step 0), and if it has not been pressed, performs other processing, such as extension connection processing (Step ■), and when pressed If so, read this and send the outside line transmission information to the control line J2b via the control line interface 10 (step [phase]), and wait for the arrival of the outside line trunk acquisition information from the main device ME (step [phase]) .

During the above control at the telephone device, the following control is performed at the main device ME. That is, the calling information sent to the control line JZb in step (3) is read into the MPUM 28 via the control line interface 21B of the extension circuit 21, and the MPUM 28 receives the calling telephone number, in this case the telephone device number. Remembering #1, step ■), then reading the outside line call information sent to the control line λb in step O through the control line interface 21B, determines that the call originating from the above telephone device is an outside line call. Step ■), capture the outside line trunk 22 (Step ■,
However, the DC loop for telephone line β is not yet closed. ), and sends outside line trunk capture information to the control line j2b via the control line interface 21B (step ■). In addition, if the outside line call information is not sent from the telephone device, the control is set to NO in step ① above.
”, and the MPUM 28 performs other processing, such as extension connection processing (step ■).

When the main device ME sends the outside line trunk acquisition information to the control line ub as described above, the MPL1 of the telephone equipment,
8 reads the outside line trunk acquisition information through the control line interface 1'0, advances the control in the direction of "YES" in step [phase], and drives the signal sending unit 11 to send out an outside line dial tone (step @). Signal sending unit 11
The outside line dial tone transmitted from the telephone line is inputted to the communication circuit network 1 and is emitted from the handset of the handset 7.

The caller hears this outside line dialing tone, knows that the outside line is ready, and then dials the destination.

When a dialing operation is performed to the destination using the dial 2 of the telephone i, the PMUT 8 stores the dialed number and sends out the dialed number in data format via the control line interface 10 on the control line ρ. ■),
In the main device ME, the MPUM 28 receives and stores the dial number sent to the control line 1b (step 2).

The MPUM 28 of the clay WME compares the dial number stored above with the registered contents of the registration memory 27, and determines whether the dial number is the dial number of an unregulated destination (step 2). In this judgment, if the above dialed number is not a dialed number of an unregulated destination, Mpuit
Step 28 compares the dialed number with the data stored in the comparison table 26 and calculates the permissible call time t1 for the calling destination indicated by the dialed number. Control Pit 421. via interface 21B. (step). After this, MPUM is timer T
Set the MM and start timekeeping (Step ■), the calling telephone device monitors whether the call loop is closed within the time set by the timer TMM (control loop that cycles through Step 0.0) .

Further, if the dial number is the dial number of a non-regulated destination as determined in step (2) above, the MPUM 28 sends non-regulated call information to the control line Ilb via the control line interface 21B (no step @l). In this case the calling telephone device! Then, as it becomes clear later, the prohibition of re-calling is not carried out, so that the call line j2. Since a call loop will always be formed, step 0. There is no need to monitor the call loop by (2).

During the above processing in the main device ME, the MPU 8 of the telephone device monitors the reception of unregulated call information or t1 data from the main device ME in step 0. (a control loop that circulates through [phase]), the control line Il from the main device ME in the step [phase]
If t1 data is sent to b, the MP of the telephone
The UT 8 reads and stores the t1 data via the control line interface 10 (step o), and then the MPUT
It is determined whether the timer TMT remains set at 8 (step 0). If the timer TMT is not set here, as in the case of the first embodiment, it means that the telephone line λ was not forcibly disconnected in the previous call, and the MPUT8 is the call loop control unit. 9
to close the call loop for the call line ℃8 (
Step o).

With the above operation, the telephone meter will change to call line f1. When the call loop is closed, in the main device ME, the loop monitoring unit 21A of the extension circuit 21□ detects the closure of the call loop, and when the MPUM2B sells 8 before the timer TM times up. , the MPU 28 controls the line opening/closing control unit 22B of the outside line trunk 22 to close the DC loop for the telephone line l (step ■), and sends a dial signal corresponding to the dial number received from the telephone line 1'@place. is sent from the dial sender 25 to the telephone line I via the outside line trunk 22 (step (2)), and the call path switch 23 is controlled to set the call path A (step (2)). After that, M.P.
The UM2B monitors the response detection unit 22A of the external line trunk 22 and the loop monitoring unit 21A of the extension circuit 211 to determine whether the called party responds and if there is no response, the loop of the call 151 u is opened (that is, the caller abandons the call). ) to monitor (
A control loop that cycles through steps 0.0).

When the called party responds, the response detection unit 22A detects the response in the same manner as in the first embodiment, and sends the response to the MPUM 2.
8 reads, the MPUM 28 sends the called party response information to the control line ρ5 via the control line interface 21B (step [phase]).

After closing the call loop for the call IL8 in step 0, the MPUT 8 of the telephone device receives the called party response information and processes the telephone device.

The on-footer is monitored (step 0.

As described above, when the called party response information is sent from the main device ME to the control line ρゎ, the MPU
T8 receives the called party information via the control line interface 10, sets a timer 7M by a program based on the t1 data received and stored in step (2), and starts timing (step (2)).

The time regulation by the timer TMT is the same as in the first embodiment, but the first set time t1, which is set as the call time limit, that is, the permissible call time, is a variable time that differs depending on the destination of the call, which is different from the first embodiment. Different from the example. Note that the second set time t2 set as the re-transmission prohibition time is a fixed time as in the first embodiment.

At the same time that the timer TXT starts counting, M
The PUT 8 monitors the call time and the end of the caller's call (on-footer) using the information from the timer TMT and the hook switch 6 (control loop with steps 0 and O ff1m).

The timer TMT reaches the first set time t before the caller ends the call.
1, the MPUT 8 sends warning sound sending instruction information to the control line J2b via the control line interface 10 (step 0).

After the process of the above step [phase], the MPUM 28 of the main device ME monitors the reception of the above-mentioned notice sound sending instruction information from the telephone device and the opening of the call loop of the telephone device (control that cycles through steps ① and ②). When the MPU 28 receives the notice sound sending instruction information from the control line 1 (loop) and the control line 1 via the control line interface 21B, the MPU 28 controls the notice sound sending unit 24 to send a disconnection notice sound to the telephone device ( Step O). In other words, the above-mentioned disconnection warning sound
The signal is sent to the communication line fl via the extension circuit 211 and the communication path A set to No. 3, and is inputted to the communication circuit network 1 of the telephone set and emitted from the handset of the handset 7.

After sending the disconnection warning sound, the MPUM 28 connects the external line trunk 22.
Control the line opening/closing control unit 22B of the telephone line! Step (2) to open the DC loop formed for the communication path switch 23, step [phase]) to open the communication path A by controlling the communication path switch 23, and further release the capture of the outside line trunk 22 (
step [phase]).

On the other hand, the MPUT 8 of the telephone device sends out the notice sound sending instruction information in step O, and after a certain timing (
During this time, a disconnection notice sound is emitted from the handset 7. ) The call loop controller 9 is controlled to open the call loop for the call line Ila (step @). The above control means that the telephone line 1 is forcibly disconnected.

In addition, if the calling party goes on-hook before the called party answers (the called party is busy or the called party is absent, etc.), the MPUT of the telephone device
8 does not receive the called party response information from the main device ME, so the control proceeds in the direction of "YES" in step (3), and in step 0, the call loop for the call line ka is released as described above. In the main device ME, the loop monitoring unit 21B of the extension circuit 21 detects the opening of the call loop at the telephone device side, and the MPUM 28 advances the control in the direction of "YES" based on the judgment in step 0, and , [Phase] and [Phase] are processed to connect the telephone line l.
to open.

Further, after the called party answers and the call is started, if the calling party ends the call (on-footer) before the first set time t1 elapses in the timer TMT, the control of MPUT 8 of the telephone device is changed to step 0. ``YES'' at step ◎ in the control loop of .0
”, and after canceling (clearing) the setting of the timer TMT (step o), open the call loop of the call line !a as described above (step (9). At this time, the main device ME performs the step @ The opening of the above-mentioned call loop is detected in the same way as in the case of , and the control of the MPUM 28 is performed by selecting "YES" at step @ in the control loop of steps (■) and (O).
”, and proceed to step ■ above.

Process [phase] and [phase] to release the telephone line.

In the above-described operation, when the control in the MPU 8 of the telephone device advances to steps 0 and 0.0, the timer TM set in the MPUT 8 is not cleared, and the first set time is reached in step 0. 1. After counting, the clocking operation continues (on the - day, the clocking time is set to zero, and then the timing is immediately restarted.). In this state, if you are off-hook again and the control by MPU 8 proceeds to step ◎ with the operation explained so far, the corresponding step ◎
Then, the control proceeds in the direction of "YES", and the MPUT 8 compares the previously dialed number stored in the dial memory 12 with the newly dialed number, and determines whether or not the two match (step ■). If both dial numbers match in this judgment, a timer TM is added.
It is determined whether or not the timer TM has already timed the second set time t2 (Step 0), and if the timer TM has not timed the second set time t2, it is impossible to make a call (Step 2). That is, even if the MPUT 8 is off-hook, the call loop control section 9 does not close the call loop of the call line .

Furthermore, when the above two dial numbers do not match, or when they match and the timer 1M clocks the second set time t2, the MPUT 8 clears the above timer TM↑ (step @) , controls the call loop control unit 9 to close the call loop for the call line U (step 0).

As is clear from the process explained above, calls other than unregulated calls that are re-made or prohibited are calls to the same destination and made before the second set time t2 has elapsed since the previous call. be.

If it becomes impossible to make a call due to the above operations, call line I
1. When the control of the MPUM 28 advances to step @ in the earthen [ME], the control advances in the direction of "No" at the step @, and
When the timer TMM set in step ■ times up (step 0), the capture of the outside line trunk 22 is released (step [phase]), and control is started (step ■).
).

Further, when the destination dial number received by the main device ME from the telephone meter is a number of an unregulated destination, the control of the MPUM 28 of the main device ME is directed to “YES” in step Send the non-regulated call information to the calling telephone as shown in step o), and close the DC loop to telephone line 1 (step ■).
, when the phone meter receives the above-mentioned out-of-regulation call information, MPUT is sent.
8 proceeds in the direction of "YES" in step 39, and the call loop controller 9 closes the call loop for the call line ℃8 (step @), and then the MPUT 8 monitors whether or not it has been on-hook by the hook switch 6. (step [phase]). When the calling party ends the call or goes on-hook without the called party responding (when the called party is busy or the called party does not answer), the hook switch 6 is opened and the MPU is activated.

controls the call loop control unit 9 to open the call loop (step @). In this way, in the case of a non-regulated call, there is no need to limit the call time or prohibit re-calls, so it is necessary to determine whether the timer TMT remains in MPUT8 of the telephone (step O), and to receive callee response information. Setting of timer TMT by receiving (step ◎, [phase]), timer T
MT's t, time measurement, and sending of notice sound sending instruction information (step @, ('13), etc.) are not controlled.In addition, in the control of the MPU of the main device ME, 28, the notice sound sending instruction information is sent from the telephone device. Therefore, when the control advances to step ■, the next control always goes to step O, and waits for the communication loop of the communication line JZ to be opened before proceeding to step ■.
Performs subsequent call termination processing.

The various controls regarding call time regulation described above can be selected depending on the user's requirements. In other words, for example, when regulating all outgoing calls, MP
Under the control of UT8, the process of step ■ is performed after step ■, except for step e, while MPUM2
With the control in step 8, step (2) is removed and step (2) is performed after step (2). In addition, if you want to prohibit re-calling within the set time t2 for all calls regardless of the destination of the previous call, the MPUT 8 will control the control to make a "YES" decision in step ◎, excluding the decision in step ■. Make the decision in step (①) immediately when facing the direction.

In addition, for calls that are not subject to call time restrictions, in the example, the destinations that are not subject to the restrictions are specified in advance; however,
You can also specify destinations that are subject to restrictions. That is, the registration memory 27 of the Dousei fME is configured to register destinations subject to restrictions, and when a dial number that is not registered in the registration memory 27 is received, the MPUM 28
The control in step (2) may be advanced in the "YES" direction.

(Effects of the Invention) As explained above, the present invention limits call time,
When the call is forcibly disconnected due to the expiration of the time limit, re-calling is prohibited for a certain period of time, and long calls can be more effectively prevented. Further, the above-mentioned call restriction can be carried out in consideration of the destination, and an extremely convenient method for restricting call time can be provided, and the present invention has extremely remarkable effects.

[Brief explanation of the drawing]

FIGS. 1 and 2 are flowcharts showing control in a first embodiment of the present invention, respectively. [Main symbols] Place, place, place 2...Telephone ME...Main device 3.24...Warning sound sending section 4.22A...Response detection section 5.22B...Line opening/closing control Section 8.28...Microprocessor unit 9...Telephone loop control unit 12...Dial memory 26...Calling destination/permitted call time comparison table 27.
・・Unregulated destination registration memory TM, TM, ・・・Timer Figure 1 Figure 3

Claims (1)

[Claims] 1. In a telephone device accommodating a single telephone or a plurality of telephones, a timekeeping operation is started in response to a response from a call destination,
When the first set time is counted, a line disconnection notice is given to the telephone in use, the telephone line in use is forcibly disconnected, and calls are made again to the above telephone line until the second set time is counted. A call time limit method for telephones that prohibits 2. The telephone talk time limiting system according to claim 1, wherein in a telephone device that accommodates a plurality of telephones, re-calling is prohibited only for the telephone that was making the forcibly disconnected call. 3. Memorize a specific destination number in advance,
2. The telephone set according to claim 1, wherein the telephone line is not forcibly disconnected and re-dialing is not prohibited for a call in which the destination number dialed at the time of the call matches any of the specific destination numbers. Call time limit method. 4. Memorize specific destination numbers in advance, and forcibly disconnect the telephone line and prohibit re-dialing when the destination number dialed at the time of the call matches one of the specified destination numbers. 2. The call time limiting method for a telephone set according to claim 1, wherein: 5. The call time limiting method for a telephone according to claim 1, wherein the first set time is different for each predetermined calling area. 6. The telephone talk time limiting system according to claim 1 or 2, wherein re-calling is prohibited only to the other party of the forcibly disconnected call.