JPS63151145A - System for releasing automatic reservation of telephone system - Google Patents

Abstract

PURPOSE:To eliminate the occurrence of the calling impossile state to a telephone system and the continuous use of resources related to reservation continuation in an exchange by starting a timer circuit in response to the operation of a reserving switch or the like and releasing the operation state of a reserving circuit when the time of this timer circuit expires. CONSTITUTION:When a telephone device 10 connected to the exchange through lines L1 and L2 should be reserved by some reason, a reserving circuit 12 is operated to continuously supply the turning-on output from the circuit 12 to a transistor TR 18 to form a loop including a calling circuit 16, and the telephone system 10 is set to the reserved state whether the system 10 is hooked on or off. When a prescribed time, for example, 15 minutes elapse after the start of this reservation, a signal which interrupts the turning-on output supply from the reserving circuit 12 to the TR 18 is supplied to the reserving circuit 12 from a timer circuit 20 responding to the signal from a reservation start signal generating means 14 to release the reserved state. Thus, reservation is automatically released even if release of re servation is forgotton, and a trouble due to user's omission of reservation release is resolved.

Description

[Detailed Description of the Invention] (Summary) A timer circuit is activated in response to the operation of a hold switch or the like that activated a hold circuit of a telephone device, and upon timeout, the operating state of the hold circuit is canceled.

(Industrial Application Field) The present invention relates to an automatic hold release method for a telephone device, and more particularly, to an automatic hold release method for a telephone device for releasing a hold after a predetermined time.

Telephones used in telephone switching networks include telephones with a hold function. This type of telephone can fully utilize its hold function as long as the user pays close attention to the hold function; however, if such consideration is not taken, disadvantages appear.

[Conventional technology]

That is, when the other party goes on-hook after the telephone hold circuit is activated by pressing the hold button on a telephone with a hold function, the responding exchange transmits a 400Hz busy tone to the telephone placed on hold. The telephone-exchange system is structured in such a way that This state continues unless the telephone user cancels the above-mentioned hold state.

In other words, the line between the telephone and the exchange remains in use.

[Problem that the invention seeks to solve]

Therefore, not only will calls not be made to the phone that is on hold from other phone terminals, but
Due to the above-mentioned hold state, the resources provided in the exchange continue to be used (occupying the busy sound source, continuing to use the DC source, etc.), and this situation is unfavorable for the operation of the exchange system. I can say that.

The present invention was created in view of the above problems, and an object of the present invention is to provide an automatic hold release method for a telephone device that has a function of releasing the hold after a predetermined period of time has elapsed after the start of the hold.

[Means for solving problems]

FIG. 1 shows a block diagram of the principle of the present invention. In this figure, 1. ,． 1 and 2 are lines connected to the exchange, and these lines L1. A telephone device 10 is connected to L2. Telephone device 10 includes the following components: hold circuit 12. Hold start signal generation means 141 telephone call circuit 16. It includes a transistor 18 and a timer circuit 20, outputs an ON output to the transistor 18 in response to the operation of the hold circuit 12, thereby creating a hold state, and changing the hold state from the signal generation time of the hold start signal generating means 14. According to the present invention, the holding operation state of the holding circuit 12 is released by a signal output from the timer circuit 20 when a predetermined period of time has elapsed.

[For production]

Telephone device 1 connected to the exchange via line L2
0 is to be held on hold for some reason, the hold circuit 12 is activated and continues to supply on-output to the transistor 18, forming a loop including the call circuit 16 for the lines Ls and L2, and To place a device IO in a pending state regardless of the presence or absence of an off footer.

When a predetermined time elapses, for example 15 minutes, from the start of this hold,
A signal for cutting off the supply of the ON output from the hold circuit 12 to the transistor 18 is supplied to the hold circuit 12 from the timer circuit 20 in response to the signal from the hold start signal generating means 14, and the hold state is released. Therefore, even if the user forgets to release the hold, it is automatically released, and the conventional problems caused by the user's failure to release the hold can be eliminated.

〔Example〕

FIG. 2 shows an embodiment of the invention. This embodiment shows a case where the present invention is implemented in a telephone having an on-footer hold function. In this figure, as in FIG. 1, lines L1. L2 is diode bridge circuit 3
0 to the a line (battery) and b line (ground). The same transistor 18 as in FIG. 1 is interposed on the a line, and a D
P/PB signal generation circuit 32, timer circuit 20 in FIG.
A timer circuit 34 corresponding to 1 and a telephone call circuit 16 similar to that shown in FIG. 1 are connected in parallel.
A handset (not shown) is connected.

The D P/P B signal generation circuit 32 is a hook switch H3
NPN l in response to off footer (opening of its contacts)
- In addition to generating a signal that turns on the transistor 40, it also outputs, for example, a telephone number information signal (frequency signal) corresponding to the pressed key of the numeric keypad 42 to the signal input IN of the telephone call circuit 16. The telephone number information signal is transmitted to the telephone circuit 16.
It is sent from the line L1+L2.

The timer circuit 34 is activated by the closing of a hold switch 50 connected in series with the timer circuit 34 and in parallel between the a line and the b line, and at the same time sends a predetermined signal to turn on a PNP transistor 62, which will be described later. occurs at its output OUT for a period of time, for example 15 minutes.

The output OUT of the timer circuit 34 is connected to the base of a PNP transistor 62 of a holding circuit 60 (an example of the holding circuit 12 in FIG. 1). The emitter of the transistor 62 is the DC output of the communication circuit 16.

. , and its collector is connected to the base of the NPN transistor 40 via a hold tone generating circuit 64 and a diode 66. The hold tone generation circuit 64 is also connected to the other line and is supplied with power from the direct current output VCC of the speech circuit 16. A held tone output OUT of the held tone generation circuit 64 is connected to a signal input IN of the telephone call circuit 16.

As mentioned above, when the telephone is connected to the exchange via the lines Ll and L2 and the telephone is called by the exchange and goes off-hook in response, the footer switch HS closes and the D P /PB signal generation circuit 32 sends an on signal to transistor 40, turning it on. As a result, transistor 18
is turned on, a loop including the telephone call circuit 16 is formed for the lines L1 and L2, and after the telephone number of the other party is sent from the circuit 32 via the telephone call circuit 16, it becomes possible to talk to the other party.

If the telephone is to be put on hold for some reason during the call, the hold switch 50 is closed.

At the same time as this closing, a low level signal is generated at the output OUT of the timer circuit 34, turning on the transistor 62.

As a result, the DC output VCC of the communication circuit 16 is supplied to the base of the transistor 40 through the diode 66, and the ON state of the transistor 40 is connected regardless of whether the hook switch H3 is opened or closed, and the loop being formed is maintained. maintain. In other words, the phone is placed on hold. Simultaneously with the transition of the telephone to the hold state, the DC output (■) of the telephone circuit 16 that caused the transition occurs. , is also supplied to the hold tone generation circuit 64 from which the hold tone signal is sent to the call circuit 16.
is sent to line L++L2 via.

On the other hand, the timer circuit 34, which starts operating when the hold switch 50 is closed, starts counting from that time, and changes the signal level of its output OUT to the original high level when a preset time, for example, 15 minutes has elapsed. This turns off transistor 62, turning off transistor 40.18 and releasing the loop that has been formed. Therefore, even if the other party of the phone placed on hold goes on-hook and the exchange continues to supply the busy tone of 40011z to the phone on hold, when the above-mentioned predetermined time has elapsed, the phone on hold will no longer be on hold. automatically canceled.

In the above embodiment, an example is shown in which the operation of the hold circuit is related to the closing of the hold switch, but the hold start signal generating means, such as a hook switch, which is generated in some way with the start of use of the telephone, is shown. It may also be made to be involved in the operation of the HS.

It may also be applicable to other types of telephone devices with a hold function.

〔Effect of the invention〕

As described above, according to the present invention, even if the user of a telephone device with a hold function forgets to release the hold, the hold state is automatically canceled, and if the user forgets to release the hold, the user can automatically cancel the hold state. It is possible to eliminate the continued use of resources involved in the occurrence of a call-disabled state and the continuation of hold in the exchange.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the principle of the present invention. FIG. 2 is a diagram showing an embodiment of the present invention. In Figures 1 and 2, 12.60 is a holding circuit, 14 is a hold start signal generating means (hold switch 50); 16 is a communication circuit; 18 is a transistor; 20.34 is a timer circuit.

Claims (1)

[Scope of Claims] A telephone switching system in which a telephone device (10) and an exchange are put on hold by the operation of a holding circuit (12) provided in the telephone device (10), comprising a holding start signal generating means (14). ), and releasing the hold state of the hold circuit (12) operated to put the telephone device (10) on hold when a predetermined period of time has elapsed from the time when the signal was generated from the hold start signal generating means (14). A timer circuit (20) that generates a signal is provided in the telephone device (10), and the signal from the timer circuit (20) is used to activate the hold circuit (1).
2) An automatic hold release method for a telephone device, characterized in that the hold operation state of item 2) is released.