JPH1127711A - Private branch exchange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce useless incoming calls in an incoming call automatically response and increase the number of idle channels. SOLUTION: A private branch exchange 1 contains extension telephone sets 5a...5n and trunk lines L1...Ln and provides automatic response to an incoming call made to the registered extension telephone set 5a...n. The private branch exchange 1 is provided with the trunk lines L1...Ln, circuits 2a...2b, a mains witch 3, subscriber circuits 4a...4n, the extension telephone sets 5a...5n and a line controller 7. The line controller 7 detects an incoming call from the trunk lines L1...Ln to the extension telephone sets 5a...5n and acquires the call and detects a busy tone signal, when an opposite party is hooked on during the line connection. In the case of detecting a busy tone signal, the incoming call processing to the extension telephone set 5a...5n receiving the call is not conducted, but termination processing is conducted. Furthermore, in the case that the caller hooks on when the extension telephone sets 5a...5n receiving the call are in holding, the holding is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange which automatically disconnects a line when a call is terminated or held.

[0002]

2. Description of the Related Art Conventionally, in a private branch exchange which accommodates an office line and an extension telephone, an incoming call automatic response automatically responds to an incoming call from an office line by an off-hook signal when the extension telephone goes off-hook. A device is provided.
The incoming call automatic answering device includes a storage unit for registering an extension telephone that automatically responds to the incoming call, an automatic incoming call notifying unit that captures an incoming call from the central office and notifies the registered extension telephone of the incoming call, An incoming call automatic response analysis unit for detecting an off-hook of the extension telephone notified of the incoming call, and an incoming call automatic response processing unit for connecting a call line between the incoming call and the off-hook extension telephone. When an off-hook signal of a pre-registered extension telephone is detected at the time of an incoming call via the office line, the corresponding extension telephone and the incoming call (called office line) are automatically connected.

[0003]

However, in the above conventional example, when an incoming call from a central office is captured, the incoming call is notified unconditionally to the registered extension telephone. Therefore, if the calling side goes on-hook at the same time as the incoming call notification to the extension telephone, a busy tone will be heard from the extension telephone that goes off-hook in response to the incoming call. In addition, even if a call line is connected between the called side and the calling side, and the called side goes on-hook while the call is on hold, the called side releasing the hold will hear a busy tone. . In other words, in the conventional example, there are disadvantages that the useless incoming call in the automatic incoming call response increases and the number of available lines increases.

[0004] The present invention is to solve such problems in the prior art, and can reduce useless incoming calls in automatic answering of incoming calls, and when the calling side goes on-hook while the extension telephone of the incoming call is on hold. An excellent private branch exchange that releases the hold and increases the number of available lines is provided.

[0005]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention provides a method for transmitting a call from a central office to a telephone exchange until a call is notified to a registered extension telephone. When a busy tone signal from the calling side is detected, the incoming call to the extension telephone is not notified, and the line with the calling side is automatically disconnected. As a result, useless incoming calls in the automatic incoming call response are reduced. Further, when the calling extension goes on-hook while the incoming extension telephone is on hold, the hold state is released, so that the number of available lines can be increased.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is an automatic private branch exchange which accommodates a plurality of extension telephones and office lines and automatically responds to an incoming call to a registered extension telephone. Incoming call detection / supplement means for detecting and supplementing an incoming call from the office line; busy sound detection means for detecting a busy sound signal when the other party connected to the line goes on-hook through the incoming call detection / supplement means; Automatic line disconnection processing means for performing a call termination processing without performing a call reception processing to an extension telephone when the sound detection means detects a busy sound signal. Therefore, useless incoming calls in the incoming call automatic response are reduced.

A second aspect of the present invention is a private branch exchange which accommodates a plurality of extension telephones and office lines and automatically answers incoming calls to registered extension telephones. Means for detecting and supplementing an incoming call, and a busy tone for detecting a busy tone signal when the calling side goes on-hook while the line is connected and the extension telephone of the incoming call is on hold by the incoming call detection / supplementing means Detecting means; and automatic line disconnecting means for automatically disconnecting the telephone line supplemented by the incoming call detecting / supplementing means after a predetermined time after the busy sound detecting means detects the busy sound signal. Therefore, when the calling party goes on-hook when the incoming extension is on hold,
The hold is released, and the number of available lines can be increased.

According to a third aspect of the present invention, there is provided an end-of-call notifying means for notifying the extension telephone which has been held that the call has ended when the busy sound detecting means detects the busy sound signal. Therefore, it is clearly determined that the calling party has gone on-hook during the hold.

Next, an embodiment of the private branch exchange of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the private branch exchange of the present invention. In FIG.
In this example, the exchange 1 has office lines L1...
a ... 5n are accommodated. The exchange 1 has office lines L1 ... Ln
Are connected to the main switch 3. The local line circuits 2a... 2b are connected to the main switch 3. further,
The subscriber circuits 4a... 4n are connected to the main switch 3, and extension telephones 5a. 2b, main switch 3
4n are connected to the line controller 7. The line control device 7 includes an incoming call detecting unit 8 for detecting an incoming call from the central offices L1... Ln to the extension telephones 5a.
Extension telephone 5a after a certain period of time elapses after capturing the incoming call
.. Is provided with an incoming call notifying section 9 for notifying incoming call to 5n.

A busy tone detector 10 for detecting a busy tone signal after on-hook of the other party or the extension telephones 5a... 5n.
And an automatic line disconnection processing unit 11 for disconnecting the communication line when a busy tone signal is detected, and the extension telephone 5a after receiving the incoming call notification.
.. 5n are detected to be off-hook, and when they go off-hook, there is provided an incoming call automatic response processing unit 12 for connecting the extension telephones 5a. further,
The on-hook call of the other party on hold is transferred to the extension phone 5
a... 5n is provided with an end-of-call notification processing unit 13 with a timer for notifying (output of the end-of-call signal)

Next, the operation of the first embodiment will be described. FIG. 2 is a flowchart showing a processing procedure of the operation of the first embodiment. In FIG. 2, when the exchange 1 detects the incoming call from the office lines L1... Ln by the incoming call detecting section 8 in the line control device 7 and seizes the line, the timer of the incoming call notifying section 9 starts (steps S1, S2). S3). When the busy tone detection unit 8 detects a busy tone signal due to the on-hook of the other party within a certain period of time after the operation of the timer (step S4: Yes), the exchange 1 sets the automatic line disconnection processing unit
1 indicates an extension telephone (any of 5a... 5n, hereinafter,
The communication line is disconnected without notifying the incoming call to the parenthesis (the number in parentheses indicates one of them) (step S5). On the other hand, if the busy tone signal is not detected within a certain period of time after the timer is activated (step S4: No), the exchange 1 switches to the extension telephone (5a).
.. 5n) is notified of the incoming call. After incoming call notification, extension phone 5
a If 5n off-hook is detected (step S5
S6, S7, S8), the incoming call automatic response processing unit 12 operates, and the extension telephone (5a... 5n) and the local line circuit (2a.
2b), an incoming call is connected through the main switch 3 and the subscriber's circuits (4a... 4n), and a call is made possible (step S).
9).

Next, a second embodiment will be described. The configuration of the second embodiment is the same as that of the first embodiment shown in FIG. That is, the exchange 1 is connected to office lines L1... Ln and has office circuits 2a... 2b, a main switch 3, subscriber circuits 4a... 4n, extension telephones 5a. . The line control device 7 includes an incoming call detection unit 8, an incoming call notification unit 9, a busy sound detection unit 10, an automatic line disconnection processing unit 11, an incoming call automatic response processing unit 12, and an end call notification processing unit 13.

FIG. 3 is a flowchart showing a processing procedure of the operation of the second embodiment. In FIG. 3, when the extension telephone (5a... 5n) is set to the hold state after the connection of the call line and the other party ends the call by on-hook,
The busy sound detector 10 detects the busy sound signal due to the end of the call (steps S10 and S11). Here, when the busy sound signal is detected, the timer in the end-of-call notification processing unit 13 operates (step S12). Within the specified time of the timer, the end-of-call notification processing unit 13 notifies the extension telephones (5a... 5b) of the end of the call from a synthesized voice device, a specific signal sound output device, or a screen display signal transmission unit (not shown) (step S1).
3). When a certain time has elapsed, the automatic line disconnection processing unit 11
Is disconnected (step S1).
4, S15).

[0014]

As described above, according to the private branch exchange of the present invention, a call originating from an office line is captured by the exchange until the incoming call is notified to the registered extension telephone. When a busy tone signal from the calling side is detected, the line with the calling side is automatically disconnected, so that useless incoming calls in the incoming call automatic response are reduced. Furthermore, when the calling party goes on-hook while the extension telephone of the incoming call is on hold, the hold state is released, so that the number of available lines can be increased.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a private branch exchange according to the present invention.

FIG. 2 is a flowchart showing a processing procedure of an operation according to the first embodiment;

FIG. 3 is a flowchart showing a processing procedure of an operation according to the second embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Switchboard 2a ... 2b Office line circuit 3 Main switch 4a ... 4n Subscriber circuit 5a ... 5n Extension telephone 7 Line control device 8 Incoming call detection part 9 Incoming call notification part 10 Busy tone detection part 11 Automatic line disconnection processing part 12 Automatic response processing Unit 13 End-of-call notification processing unit L1 ... Ln Local line

Claims (3)

[Claims] 1. A private branch exchange accommodating a plurality of extension telephones and office lines and automatically answering an incoming call to a registered extension telephone, and detecting an incoming call from the office line to said extension telephone. The incoming call detection / supplement means for supplementing, the busy sound detection means for detecting a busy sound signal when the other party connected to the line goes on-hook through the call detection / supplement means, and the busy sound detection means When a signal is detected,
An automatic private branch exchange apparatus comprising: automatic line disconnection processing means for performing a call termination process without performing a process of terminating a call to an extension telephone. 2. A private branch exchange accommodating a plurality of extension telephones and office lines and automatically answering an incoming call to a registered extension telephone, and detecting an incoming call from the office line to said extension telephone. An incoming call detecting / supplementing means for supplementing, a busy sound detecting means for detecting a busy sound signal when the calling side goes on-hook while the line is being connected by the incoming call detecting / supplementing means and the extension telephone of the incoming call is on hold. Automatic line disconnection means for automatically disconnecting the call line supplemented by the incoming call detection / supplement means after a predetermined time after the busy sound detection means detects the busy sound signal. Automatic exchange device. 3. An end-of-call notifying means for notifying an extension telephone which is on hold when the busy-tone detecting means detects a busy-tone signal, to notify that the call has ended. Item 3. The private branch exchange apparatus according to item 2.