JP3485979B2 - Communication system and extension connection device disconnection processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extension connecting device for connecting a portable terminal for extension to a private branch exchange, and more particularly to a method of performing reversal disconnection processing for disconnecting a call of the portable terminal based on busy tone. .

[0002]

2. Description of the Related Art A communication system has been developed in which a portable device (a portable terminal for extension) such as a cordless telephone or a radio for work communication of about 1 mW is connected to a private branch exchange (PBX) by using an extension connecting device. In such a communication system, FIG.
As shown in, the PB to which the terminal (telephone) 1 is connected
The extension connection device 3 is connected to X2, the base station 4 is connected to the extension connection device 3, and the base station 4 and the extension portable device 5 are connected.
Wireless connection is being made between and.

In the above communication system, P
Terminal 1 directly connected to BX2 and portable device 5 for extension
The call with the PBX 2, the extension connection device 3, and the base station 4 is performed, and the reversal disconnection processing for disconnecting the call between the terminal 1 and the portable device 5 is also performed by the PBX 2 and the extension connection device 3. Be seen. That is, when disconnection occurs by placing the handset on the hook in the terminal 1 that is talking to the portable device 5, the PBX 2 detects this disconnection and performs the polarity disconnection process, and the extension connection device 3 receives the polarization signal. To send. When the extension connection device 3 receives the polarization signal, the extension connection device 3 transmits a disconnection signal to the portable device 5 via the base station 4 to disconnect the call with the portable device 5.

[0004]

Some PBXs do not have the function of performing the reversal cutting. When such a PBX is used as the PBX 2 of the communication system as described above, even if a disconnection occurs in the terminal 1 on the PBX 2 side, the PBX 2 cannot transmit a reversal signal to the extension connection device 3, so that the extension connection is performed. There is a problem that the call cannot be disconnected from the device 3 to the portable device 5. For this reason, in a communication system in which the extension portable device 5 is connected using the extension connection device 3, the PBX used must necessarily have a reversal disconnection processing function, which causes a problem in the system configuration. Was becoming.

The present invention has been made in view of the above-mentioned conventional circumstances, and the extension connecting device performs the reversing disconnection processing for disconnecting the call of the portable terminal based on the busy tone, so that the PB
An object of the present invention is to provide a disconnection processing method for an extension connecting device, which relaxes the functional requirements for X and facilitates the configuration of a communication system.

[0006]

In order to achieve the above object, a disconnection processing method of an extension connecting device according to the present invention is a disconnection processing method of an extension connecting device for connecting an extension portable terminal to a private branch exchange. It is characterized in that a busy tone issued is detected and a disconnection signal for disconnecting the call is transmitted to the extension mobile terminal based on the busy tone.

Here, the busy tone (busy tone) is a signal sound of 400 Hz heard by the handset when the other party on the calling side is disconnected during a telephone call, and as shown in FIG.
The signal tone for about 0.5 seconds (500 ms) is intermittently continuous at a cycle of about 1 second, and any private branch exchange must always be busy tone based on disconnection from the other party. Has the function of generating.

[0008]

According to the disconnection processing method of the extension connecting device according to the present invention, even when a private branch exchange having no reversal disconnection processing function is used, the private branch exchange detects the disconnection from the terminal and the extension line. A busy tone is transmitted to the connection device to cause the extension connection device to disconnect the mobile terminal. Therefore, the communication system for connecting the portable terminal for extension using the extension connecting device can be configured by any private branch exchange.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting method according to an embodiment of the present invention will be described below with reference to the drawings. Even in the communication system of this embodiment, as shown in FIG. 1, a terminal (telephone) 1
Connect the extension connection device 3 to the PBX 2 to which is connected,
A base station 4 is connected to the extension connection device 3, and the base station 4 and the extension portable device 5 are wirelessly connected.

The extension connecting device 3 of this embodiment is provided with
As shown in FIG. 3, a program divided into LEVEL0 to LEVEL2 is built in, and LEVEL0 and LEVEL located in the operating system (OS) are installed.
The first program is in charge of interrupt processing and the like, busyton (BT) detection processing, and the like, and the LEVEL2 program located in the application is in charge of various other application processing. The process of detecting the busy tone transmitted from the PBX 2 in order to disconnect the call with the portable device 5 is executed by the program of LEVEL 1 of the extension connection device 3.

FIG. 4 shows a procedure of a busyton (BT) detection process by the program of LEVEL1. A disconnection occurs at the terminal 1 talking to the portable device 5 and the PBX2
Detects this disconnection, and the PBX 2 transmits a busy tone to the extension connecting device 3, the extension connecting device 3 performs the following detection processing. Note that the extension connecting device 3 compares the busy tone level state with a means for detecting the busy tone level state, a means for holding or updating the detected level state, and a busy tone level state in order to execute the following processing. Means, a means for holding or updating an UP status flag described later, a status counter for incrementing the counter value every 100 ms according to the busy tone status, a means for judging the status of the UP status, a status counter Means for judging the counter value, BT detection counter for increasing the counter value when the counter value of the status counter is "4" or more, means for judging the counter value of the BT detection counter, means for performing disconnection processing And so on.

As shown in FIG. 2, the busy tone is a high level state "H" which continues for about 0.5 seconds (500 ms).
Is a signal sound that is intermittently repeated at a cycle of 1 second, and is generated by the PBX 2 that has detected the disconnection. The extension connection device 3 sends the busyton from the PBX 2 to 100 mS (0.
(1 second), it constantly monitors, and when it receives a busy tone, it first updates the state of the received busy tone (that is, the high level state “H” or the low level state “L” as shown in FIG. 2). The status is held as the status (NEW) (step S1).

Next, the busy tone state (OLD) held in the memory in the immediately preceding monitoring is compared with the new status (NEW) (step S2), and if the two statuses match, the counter value of the status counter is set to 1 By one (step S3). Here, at the time when the busy tone is emitted , the status changes from "L" to "
Since the status changes to H ", the above two statuses do not match. In this case, the old status (OLD) is updated with the new status (NEW) (step S
4), the UP status held in the memory as a flag is set to "0" (step S5), and the counter value of the status counter is cleared to "0" (step S).
6).

Next, the UP status flag is checked (step S7), and if it is "0", it is checked whether the counter value of the status counter is "4" or more (step S8). At this time, when the busy tone is emitted and the detection is started, the UP status is "
It is set to 0 "and the counter value of the status counter is" 0 ". Therefore, after the determinations in steps S7 and S8, the processing from step S1 is repeated.

Since the busy tone which continues for 500 ms in the high level or the low level state is detected at the interval of 100 ms, the state of the busy tone held as the new status (NEW) at that time (BT latest status) is held in the memory last time. It becomes the same as the busy tone state (OLD) (step S1). Therefore, the count value of the status counter is incremented by 1 this time according to the determination in step S2 (step S3). Next, the UP status flag is checked (step S7) to check whether the counter value of the status counter is "4" or more (step S8). However, since the counter value has not yet reached "4", the above step S1 Through S3 and S7 are repeated until the counter value reaches "4".

As a result, when the counter value of the status counter reaches "4", the counter value of the BT detection counter other than the status counter is incremented by 1 (step S9), and the UP status flag is set to "1". "" (Step S10). As described above, the condition that the counter value of the status counter has reached "4" is that the busy tone pulse of 500 ms width is detected in at least 400 ms width as shown in FIG. 2 to ensure accurate busy tone detection. This is because. Therefore, the counter value of the BT detection counter that is increased based on this counter value indicates the number of busy tone pulses.

After the processing of step S10, the processing from step S1 is repeated, but the busyton state changes (for example, from the high level to the low level state).
At this time, the busy tone state (OLD) held in the memory last time does not match the new status (NEW) (steps S1 and S2), so the above step S
The processing from 4 to S10 is repeated, and the counter value of the BT detection counter is incremented by 1 in response to the next busyton pulse (for example, a pulse of 500 ms on the low level side this time).

When the number of busy tone pulses is counted by the BT detection counter as described above and the busy tone disappears, the low level state continues. In this case, while the UP status is set to "1" in step S10, steps S1, S2,
After the processing of S3 is performed, it is determined whether the counter value of the status counter has reached "10" after the determination of step S7 (step S11). As a result, the counter value is "1".
If it has not reached 0 ", the above steps S1 and S
The counter value for the processing of 2, S3, S7, and S11 is "10".
Until the counter value reaches 10, and when the counter value reaches "10", clear the counter value of the status counter.
It is set to 0 "(step S12) to prepare for the subsequent detection of busy tone.

That is, in this embodiment, when the low level state continues for 1 second (10 × 100 ms) or more, the busy tone disappears. When Busyton is detected again, the processing from step S1 is performed.

The counter value of the BT detection counter (step S9) is constantly monitored by the program of LEVEL1, and when the counter value reaches "7", a process of disconnecting the call between the terminal 1 and the portable device 5 is performed. To do. That is, as shown in FIG. 5, it is checked whether or not the counter value of the BT detection counter has reached “7” (step S21). If the counter value has reached “7”, the counter of the BT detection counter is prepared in preparation for subsequent busy-ton detection. Clear the value to "0"
(Step S22). Then, a disconnection notification process is performed (step S23), and a disconnection signal is transmitted to the portable device 5 via the base station 4 to release the call path. Further, during the processing shown in FIGS. 4 and 5, Busyton issued from the PBX 2 is transmitted to the portable device 5 via the extension connection device 3 and the base station 4, and the portable device 5 receives about 3.5 seconds ( 7 × 500m
The busy tone during s) is heard and the call with the terminal 1 is disconnected.

In the above embodiment, the busy tone detection is carried out at a cycle of 100 ms. However, the present invention is not limited to this, and it can be arbitrarily set as long as it is about half the width of the busy tone pulse or less. However, in order to improve the detection accuracy of the busy tone pulse, it is preferable to make the detection cycle as short as possible. The counter value of the status counter, which is the threshold value, is also arbitrarily set according to the busy tone detection cycle, and setting the time width to be substantially the same as the width of the busy tone pulse improves the detection accuracy. Preferred for. Further, if the count value of the BT detection counter, which is the threshold value, is too small, the cutting process may be erroneously performed. On the other hand, if the count value is too large, the cutting process may not be performed quickly. You can set it to any value.

[0022]

As described above, according to the disconnection processing method of the extension connecting device of the present invention, the extension connecting device detects the busy tone emitted from the private branch exchange and disconnects the call based on the busy tone. Since the disconnection signal is transmitted to the extension mobile terminal, even when the communication system accommodating the extension portable device by the extension connection device is configured using the private branch exchange having no reversal disconnection processing function, It is possible to disconnect the call to the portable device. Therefore, regardless of which private branch exchange is used, a communication system accommodating a portable telephone for extension can be configured, and the degree of freedom and ease of system configuration is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a communication system according to an embodiment of the present invention.

FIG. 2 is a waveform diagram of a busy tone signal.

FIG. 3 is a program configuration diagram of an extension connection device.

FIG. 4 is a flowchart showing a busy tone detection process.

FIG. 5 is a flowchart showing a busy tone monitoring process.

FIG. 6 is a configuration diagram of a conventional communication system.

[Explanation of symbols]

1 terminal 2 Private branch exchange (PBX) 3 Extension connection device 5 portable

Claims (4)

(57) [Claims] 1. A base station wirelessly connected to an extension mobile terminal
The extension connection device provided between the private branch exchange and the
A method for performing disconnection processing on a line portable terminal , wherein the private branch exchange is operated at a cycle of half the busy tone pulse width or less.
It detects the busy tone pulse emitted from the device and counts the number of times the busy tone pulse is detected continuously.
Each time the count reaches the first threshold,
The detected number of G-tone pulses is counted, and the count value of the number of G-tone pulses detected is the second threshold value.
A disconnect signal to disconnect the call when the
An extension characterized by transmitting to an extension mobile terminal via
The disconnection processing method of the connection device. 2. A base station wirelessly connected to an extension mobile terminal
Install an extension connection device between the private branch exchange and the
Communication system that connects the extension mobile terminal to the private branch exchange via
The extension connecting device is a circuit that is less than half the busy tone pulse width.
A busy tone pulse from a private branch exchange
The number of times that the busy tone pulse is detected continuously.
Count the number and the count reaches the first threshold
The number of busy tone pulses detected is counted every
G-tone pulse detection number count value becomes the second threshold
A disconnect signal is sent through the base station to disconnect the call when it reaches
Communication system characterized by transmitting to the extension mobile terminal
Tem. 3. The communication system according to claim 2,
The extension connecting device, until the disconnection signal is transmitted,
The busy tone emitted from the private branch exchange is used as an extension mobile terminal.
To the extension mobile terminal to send a busy tone.
A communication system characterized by outputting. 4. A base station wirelessly connected to an extension mobile terminal
Installed between the private branch exchange and the extension mobile terminal as a base station
In an extension connection device that connects to a private branch exchange via a private branch exchange, the private branch exchange has a cycle less than half the busy tone pulse width.
Detecting hand that detects a busy tone pulse emitted from
And the number of times the busy tone pulse is detected continuously.
Status counter and the count count of the status counter reaches the first threshold.
Each time the busy tone pulse is detected,
The detected number count value of the busy tone counter and the busy tone counter is the second threshold.
When the value is reached, the disconnect signal to disconnect the call
An extension connection device , comprising: a notification means for transmitting the extension mobile terminal via a station .