JP7234823B2 - emergency call system - Google Patents

Description

TECHNICAL FIELD The present invention relates to an emergency call system for making an emergency call to an emergency call agency such as a police station, Japan Coast Guard, or fire station.

In an emergency call system that makes an emergency call to a special number (110, 118, 119), which is the telephone number of the emergency call reception system (hereinafter referred to as the command center) of the emergency call agency such as the police station, the Japan Coast Guard, and the fire department, traffic To make an emergency call by capturing a telephone line when an emergency call factor such as an accident or fire occurs.

For example, in the case of a fire reporting system, when a fire reporting button is pressed, the fire reporting device calls 119, which is the telephone number of the fire command center, and after the fire command center responds, a voice message is sent. to make an emergency call, and disconnect the telephone line after the emergency call. After that, the fire alarm system waits for a call back from the fire control center for a certain period of time. Then, after the end of the call, the telephone line is disconnected (Patent Document 1).

JP-A-2000-106606

As an emergency call system, a configuration having an emergency call device connected to a telephone line, and a dedicated telephone and a private branch exchange connected to a subsequent stage of the emergency call device can be considered.

In this emergency call system, if the telephone line is a line that has a PB dial-in service contract, the command desk disconnects the line while waiting for the reverse call (usually, the command desk does not disconnect the line. It is assumed that the side disconnects the line by mistake.) Therefore, when the line hold is released, the reverse signal will be an incoming call according to the PB dial-in procedure (hereinafter referred to as a PB dial-in incoming call). Become.

At this time, the emergency call device cannot distinguish between the gyakushin signal (IR signal) due to the PB dial-in incoming call and the normal gyakushin signal (IR signal), so the dedicated telephone rings. However, there is a problem that an extension designation signal (PB signal) is sent out from the telephone line, making it impossible to make a reverse call to the command desk.

This problem will be explained with reference to FIG. The emergency call device 100 dials (sends) a special number when a report factor occurs (step S101). That is, a special number selection signal is transmitted to the telephone network 5 . The telephone network 5 that has detected the call to the special number causes the command console 6 to receive the call (step S102). The command table 6 transmits a response signal to the emergency call device 100 via the telephone network 5 (steps S103, S104). The emergency notification device 100 sends the notification message to the command console 6 via the telephone network 5 (step S105), and disconnects the line after transmission (steps S106 and S107). The emergency call device 100 waits for a reverse message from the command desk 6 for a certain period of time after the line is disconnected.

The command console 6 sends a reverse message to the telephone network 5 (step S108), and the telephone network 5 transmits an IR signal due to the PB dial-in incoming call as an incoming call signal to the emergency call device 100 (step S109). The emergency call device 100 rings the telephone 2 (step S110). The telephone 2 is a dedicated telephone connected to the rear stage of the emergency call device 100 and used to communicate with the command console 6 . Although not shown, a private branch exchange is connected to the rear stage of the emergency call device 100. FIG.

When the telephone 2 responds (steps S111 and S112), an extension designation signal (1-4 digit PB signal) is transmitted from the telephone network 5 to the telephone 2 (step S113). In the PB dial-in incoming call, if the telephone 2 does not disconnect the line within 2 seconds after receiving all the digits of the extension designation signal, the line is disconnected from the telephone network 5 (steps S114, S115), so the counter-call to the command desk 6 side. You will not be able to make calls.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems. To enable a reverse signal call against a reverse signal due to a PB dial-in incoming call in an emergency call system having a dedicated telephone set and a private branch exchange.

The present invention is an emergency call system having an emergency call device connected to a telephone line to which a PB dial-in service is subscribed, and a dedicated telephone and a private branch exchange connected to the subsequent stage of the emergency call device, The emergency call device, when detecting an incoming call while waiting for a reverse message from the command desk, means for responding to the incoming call; and means for ringing a dedicated telephone after disconnection of the call.

According to the present invention, in an emergency call system having an emergency call device connected to a telephone line to which a PB dial-in service is subscribed, and a dedicated telephone and a private branch exchange connected after the emergency call device, the PB Gyakushin call becomes possible for Gyakushin due to dial-in incoming call.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the emergency notification system which concerns on embodiment of this invention. 1 is a block diagram showing the configuration of an emergency call device according to an embodiment of the present invention; FIG. FIG. 4 is a timing chart for explaining extension designation signal determination processing in the emergency notification device according to the embodiment of the present invention; It is a figure which shows the processing sequence of the emergency notification system apparatus which concerns on embodiment of this invention. and FIG. 11 is a diagram showing an example of a processing sequence of a conventional emergency call system.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
<Emergency call system configuration>
FIG. 1 is a diagram showing the configuration of an emergency notification system according to an embodiment of the present invention.
are doing.

As shown in the figure, the emergency call system according to the embodiment of the present invention comprises an emergency call device 1 and a telephone 2 connected downstream. A private branch exchange 3 accommodating a plurality of extension telephones 4 is also connected to the rear stage of the emergency call device 1 . Also, the outside line side of the emergency call device 1 is connected to the telephone line of the telephone network 5 . The telephone 2 and private branch exchange 3 share a telephone line.

The telephone lines of the telephone network 5 are analog telephone lines or metal IP telephone lines. The command desk 6 is a reception system of the police station, the Japan Coast Guard, or the fire station, and the special numbers, which are the respective telephone numbers, are 110, 118, and 119.

The emergency call device 1 has a function of calling 110, 118, or 119 to make an emergency call. The telephone 2 is a dedicated telephone for communicating with the command console 6 . The extension telephone 4 is a telephone (including a facsimile device) that can be used while the emergency call device 1 is on standby.

<Configuration of emergency call device>
FIG. 2 is a block diagram showing the configuration of the emergency call device according to the embodiment of the invention.
As illustrated, the emergency call device 1 according to the embodiment of the present invention includes a line control section 11, a sound signal detection section 12, a voice control section 13, and a main control section 14 that controls these sections. . A connection with the private branch exchange 3 is omitted because it is unnecessary for the following explanation.

The line control unit 11 is connected to the telephone line of the telephone network 5, and performs connection control with the telephone network 5, detection of various signals (IR signal, extension designation signal, busy tone, etc.), selection signal transmission, and the like. The sound signal detection unit 12 receives the extension designation signal detected by the line control unit 11, detects the transmission time and transmission interval of the PB sound signal of the extension number as the extension designation signal, and starts transmission of the extension designation signal. and stop. The voice control unit 13 controls input/output of voice to/from the telephone 2 .

The main control unit 14 is composed of a computer processor, memory, etc., and controls the line control unit 11, the sound signal detection unit 12, and the voice control unit 13 to perform various operations (see FIG. 4), which will be described later. Make the emergency call device 1 execute. The voice data of the report message to be sent to the command table 6 and the like are stored in this memory.

<Determination processing of extension designation signal>
Table 1 shows the dial-in PB signal transmission standards described in NTT East's technical reference material.

この表に示されているように、内線指定信号の送出時間（５０ｍｓ以上）、ミニマムポーズ（３０ｍｓ以上）、周期（１２０ｍｓ以上）には上限が存在しないため、緊急通報装置１は、内線指定信号の受信後、回線切断タイミングを判別する必要がある。本発明の実施形態に係る緊急通報装置１では、内線指定信号を受信する専用のデバイス、すなわち内線指定信号としてのＰＢ音信号の周波数（例えば“１”：６９７Ｈｚ＋１２０９Ｈｚ、“２”：６９７Ｈｚ＋１３３６Ｈｚ）を識別する回路を実装せずに、ＰＢ音信号の立ち上がり、立ち下がり等を検出する処理で内線指定信号の送出開始／停止を判定し、回線切断のタイミングを判断する。

As shown in this table, there is no upper limit for the transmission time (50 ms or more), minimum pause (30 ms or more), or period (120 ms or more) of the extension designation signal. is received, it is necessary to determine when to disconnect the line. In the emergency call device 1 according to the embodiment of the present invention, a dedicated device for receiving the extension designation signal, that is, identifies the frequency of the PB sound signal as the extension designation signal (for example, "1": 697 Hz + 1209 Hz, "2": 697 Hz + 1336 Hz). Without installing a circuit for controlling the extension, the start/stop of transmission of the extension designation signal is determined by the process of detecting the rise and fall of the PB sound signal, and the timing of line disconnection is determined.

FIG. 3 is a timing chart for explaining extension designation signal determination processing in the emergency notification device according to the embodiment of the present invention. About 600 ms after the transmission of the response signal, the emergency call device 1 disconnects the line after receiving all the digits (up to 4 digits) of the extension designation signal due to the transmission time (50 ms or more) and the transmission interval (120 ms or more) of the extension designation signal. determine when to do The number of digits of the extension designation signal is set in advance in the emergency call device 1 according to the number of digits of the extension designation signal in the PB dial-in service contract, and the line is disconnected two seconds after receiving the extension designation signal with the same digits as the setting. process.

<Processing sequence of the emergency call system>
FIG. 4 is a diagram showing a processing sequence of the emergency notification system according to the embodiment of the invention.

When an emergency call factor occurs, the emergency call device 1 dials (calls) a special number (procedure S1). That is, a special number selection signal is transmitted to the telephone network 5 . The telephone network 5 that has detected the call to the special number calls the command console 6 (procedure S2). The command table 6 transmits a response signal to the emergency call device 1 via the telephone network 5 (steps S3 and S4). The emergency notification device 1 sends the notification message to the command console 6 via the telephone network 5 (step S5), and disconnects the line after transmission (steps S6 and S7). The emergency call device 1 waits for a reverse message from the command console 6 for a certain period of time after disconnection.

The command console 6 sends a reverse call to the telephone network 5 (step S8), and the telephone network 5 transmits an IR signal as an incoming call signal to the emergency call device 1 according to the PB dial-in procedure (step S9). Procedures S1 to S9 up to this point are the same as procedures S101 to S109 in FIG.

Upon receiving the IR signal, the emergency call device 1 does not ring the telephone set 2 as in step S110 in FIG. Next, after receiving all digits of the extension designation signal transmitted from the telephone network 5 (step S11), the emergency call device 1 disconnects the line (step S12).

Next, the emergency call device 1 causes the telephone 2 to ring (step S13). By off-hooking the telephone 2, the response is transmitted to the command console 6 via the emergency call device 1 and the telephone network 5 (steps S14, S15, S16), and a reverse call is made between the telephone 2 and the command console 6 ( step S17). After that, when the reverse message call ends, the line is disconnected from the telephone 2 (steps S18, S19, S20). Here, from step S13 to step S20 is reverse communication operation.

REFERENCE SIGNS LIST 1 emergency call device, 2 telephone, 3 private branch exchange, 4 extension telephone, 5 telephone network, 6 command console, 11 line control section, 12 sound signal detection section, 13 voice control section, 14 … main control unit.

Claims (3)

An emergency call system having an emergency call device connected to a telephone line to which a PB dial-in service is subscribed, and a dedicated telephone and a private branch exchange connected to the rear stage of the emergency call device,
The emergency call device, when detecting an incoming call while waiting for a reverse message from the command desk, means for responding to the incoming call; and means for ringing a dedicated telephone after line disconnection. In the emergency call system according to claim 1,
The emergency call system, wherein the emergency call device comprises determination means for determining the timing of receiving all the digits of the extension designation signal based on detection of the transmission time and transmission interval of the extension designation signal of each digit. In the emergency call system according to claim 2,
The determination means detects the rising and falling edges of the PB sound signal as the extension designation signal, thereby detecting the transmission time and transmission interval of the extension designation signal.

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