JPS6372248A - Method for confirming calling enable state - Google Patents

Abstract

PURPOSE:To unattendedly confirm a side to be confirmed by bringing a terminal equipment into a calling state, stopping once, sending a call signal gain after a prescribed time, receiving a busy signal from a terminal equipment to be confirmed so as to confirm the calling enable. CONSTITUTION:A telephone set 1 calls a telephone set 2 and hooks on once after confirming a call signal. Thus, a terminal equipment 10 is in the calling state and the telephone set 2 is called from the telephone set 1 again after a prescribed time, since the terminal equipment 10 keeps the call state, a busy signal is outputted from an exchange 6. Thus, the terminal equipment 10, that is, the telephone set 2 is called by listening to the signal to confirm the talking state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for confirming whether a telephone terminal can make a call.

[Conventional technology]

Conventionally, in order to check whether a certain telephone terminal is operating normally, that is, whether or not it is possible to make a call, there has been a method such as having the telephone terminal call you.

[Problem that the invention seeks to solve]

However, the conventional method described above cannot be performed at any time using any telephone terminal.

This invention was made in order to solve the conventional problems as described above, and it is possible to make a call from any telephone terminal at any time to check whether or not a certain telephone terminal is capable of eruption. The purpose is to obtain a confirmation method.

[Means for solving problems]

The method for confirming whether a call can be made according to the present invention becomes a calling state when the next calling signal does not come after receiving a calling signal;
A terminal device is provided that maintains a calling state with a terminal, calls the terminal from another terminal, and after recognizing the calling signal, disconnects the terminal,
After a certain period of time, the terminal is called again, and by receiving a busy signal, it is confirmed that the terminal is capable of making a call.

[For production]

In this invention, the telephone terminal to be confirmed is called from any telephone terminal and the telephone terminal is then hung up, whereby the terminal device provided on the side to be confirmed becomes in a calling state. here,
When the telephone terminal on the side to be confirmed is called again, since it is in a calling state, a busy signal is emitted, and upon receiving this, the calling state is confirmed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows the configuration of the telephone line, 1 and 2 are telephones, 3 and 4 are subscriber-saving lines, 5.6 is the exchange of the telephone office, 7.8 is the subscriber monitoring circuit of the telephone office, and 9 is the inter-office trunk line. , 10 are terminal devices.

Further, FIG. 2 shows a block configuration of the terminal device 10, and 11
1 is a calling signal receiving circuit; 12 is a calling state start delay circuit;
3 is a calling state maintenance circuit, and 14 is a calling circuit.

Next, the operation of the above configuration will be explained. 1. First, when the telephone 2 is not in use, the subscriber monitoring circuit (relay) 8 is not operating. In other words, when the handset on the telephone 2 side is put down (off-hook), the electrical connection (<KN, circuit) is disconnected (open) as seen from the exchange 6, and when the handset is lifted up, it becomes on-hook and the other party When there is a call from the side, a busy tone will be emitted.

Here, if you dial any telephone 1 and call telephone 2 when it is off-hook, the ring signal (sent for 1 second, 2
seconds off) is sent from the exchange 6 to the telephone 2 and the terminal 4t10 via the subscriber line 4, and the bell of the telephone 2 rings. On the other hand, in the terminal device 10 , the calling signal receiving circuit 11 receives the calling signal and provides the received output to the calling state start delay circuit 12 . The delay circuit 12 is set by the first ringing signal and reset by the next ringing signal, but if the next ringing signal does not arrive even after the expected time has elapsed, specifically, the delay circuit 12 is set by the first ringing signal and reset by the next ringing signal. If there is no next calling signal even after 5 to 10 seconds have elapsed, a command is given to the calling circuit 14 to operate the calling circuit 14.

As a result, the DC circuit is connected as described above, and the exchange 6 emits a tone indicating that the receiver is ready to accept. Further, the calling state maintenance circuit 13 detects the operation of the calling circuit 14 and gives a command to the calling circuit 14 to maintain the calling state for 10 to 20 seconds.

The method for confirming whether a call can be made in this embodiment utilizes the above-mentioned terminal device.First, telephone 1 calls telephone 2, and after recognizing the calling signal, the call is hung up. This results in
The terminal device 10 enters the calling state, and after a certain period of time (at least the time during which the exchange 5 can confirm that the terminal device 10 is on-hook, and within the time period during which the call can be made while the call continues), the call is made again from the telephone @1 to the telephone 2.
When called, a busy signal is issued from the exchange 6 because the terminal device 10 maintains the calling state. Therefore, by listening to this signal, it can be confirmed that the terminal device 10, that is, the telephone set 2, is capable of making a call and that it is possible to talk. In the event of a disconnection, the calling signal is sent to the receiving circuit 11.
is not received, and the terminal device 10 does not operate. Therefore, when the telephone 1 makes a call and calls again, the user can hear the ringing tone and confirm that the call cannot be made. Note that in the terminal device 10, since it is wasteful to respond to a call signal for a normal call, the number of times the call signal is received may be determined, and no calls will be accepted after that.

FIG. 3 shows an example of the case where this invention is applied to a four-equipment device,
15 is the center device of the security center, and the other components are the first
It is similar to the figure. Further, FIG. 4 shows a more detailed version of the configuration shown in FIG. 3, where 2o is the CPU on the center device 15 side,
21 is a tone dialer. 122 is a DI which activates the exchange 5 in a loop. A CM L! 23 is a tone dialer which switches the communication circuit from the telephone 1 to the center device 15. J Shire 2
4 is a 16Hz bandpass filter for receiving the caller's ringtone, 25c is a 400Hz bandpass filter for receiving the busy tone, 26 is the modem, and 27.28 is the amplifier%d.
i is a contact of the DI relay 22, CrrLt is a contact of the CM L relay 23, 27 is an incoming call detection circuit, 28 is a line monitoring circuit that monitors whether the telephone 1 is in use, 29 is the CPU on the terminal device 10 side, and 30 is a tone (Audio frequency) dialer-131
is DI relay, 32 is CML relay, 33 is modem, 3
4.35 is an amplifier, 36 is an incoming call detection circuit, 37 is a line monitoring circuit that monitors when the telephone 2 is in use, di is a contact point of DI relay 31, and crrLL is a contact point of CML relay 32.

Next, the operation shown in FIG. 4' will be explained. First, center device 1
On the 5 side, the DI relay 22 and the CML relay 23 operate according to the call instruction from the CPU 20, and the exchange also operates.

Next, 5) the dialer 21 is operated in response to a selection signal transmission instruction from the CPU 20, an exchange connection operation is performed, and a call reception operation is performed.

Here, on the terminal device 10 side, a ring tone (16H) is sent from the exchange.
2), the incoming call detection circuit 36 detects this, and C
Count with PU29. On the center device 15 side, the other party's ringing tone is received and confirmed by the 16Hz pantone filter 24 via the amplifier 28, the CPU 20 instructs off-hook, and the DI relay 22 and CML relay 23 are restored. - On the terminal device 10 side, the CPU 29 confirms that the ringing tone does not continue and instructs on-hook after 5 to 10 seconds. With this, D, DI relay 31, CML
The relay 32 is activated and the exchange 6 is brought into operation. This calling state continues for 10 to 20 seconds, the CPU 29 instructs off-hook, and the DI relay 31% and the CMLIJ relay 32 are restored. Further, while the terminal device 10 is in the calling state, the CPU 20 issues a re-call instruction on the center device 20 side, the DI relay 22 and the CML relay 23 operate, and the exchange also operates. Next, the CPU 20 issues a selection signal transmission instruction again.
The tone dialer 21 operates, an exchange connection operation is performed, and a call is received on the terminal device 10 side. At this time, since the terminal device 10 is in a calling state, the center device 15
On the other side, the other party's busy tone is received, and the 40
After checking with the 0Hz band pass filter 25, the CPU 20 instructs off-hook, and the DI relay 22 and CML relay 2
3 will be restored. - On the terminal device 10 side, if there is a disconnection in the telephone terminal including the subscriber monitoring circuit 8, the exchange 6 will not operate, so the calling signal will not reach the terminal device 10'', and the terminal device 10 will not operate. Center equipment fiit1
On the 5th side, the other party's ringtone is detected again, and the terminal!
[You can confirm that you cannot make a call from 10.

〔Effect of the invention〕

As described above, according to the present invention, a calling signal is sent to the terminal to be confirmed from another terminal, the terminal device is thereby put into the calling state, the call is immediately disconnected, and the calling signal is sent again after a certain period of time. By receiving a busy signal from the confirming terminal, it is confirmed that a call can be made, so even if the confirmed party is unattended, the confirmation can be made without any problem, and what is more, any telephone terminal can be used at any given time. You can also check it from here.

[Brief explanation of the drawing]

1 and 2 are respectively a telephone line configuration diagram and a configuration diagram of a terminal device according to the present invention, and FIGS. 3 and 4 are respectively a telephone line configuration diagram and a more specific configuration of the security device according to the present invention. Diagram 0 1.2...telephone, 5.6...exchange, 7,8...
・Subscriber monitoring circuit %10...terminal device.

Claims (4)

[Claims] (1) In a telephone network, a terminal device is provided that enters a calling state and maintains this calling state if the next calling signal does not arrive even after the expected time has passed after receiving a calling signal;
It is characterized by calling the terminal from another terminal, recognizing the calling signal, calling the terminal again after a certain period of time, and confirming that the terminal is capable of making a call by receiving a busy signal. How to confirm whether you can make a call. (2) The method for confirming whether a call can be made as set forth in claim 1, characterized in that the number of times the calling signal is received is predetermined. (3) The method for confirming whether a call can be made as set forth in claim 1 or 2, wherein the duration of the call state is set to 10 to 20 seconds. (4) The time when the next call signal should naturally arrive is 5 to 10 minutes.
Claims 1 to 3, characterized in that
The method for confirming whether a call can be made as described in any of the paragraphs.