JPH07203503A - Key telephone system - Google Patents

Abstract

PURPOSE:To improve the connection efficiency of the line of a key telephone system provided with a cell free dial function by detecting the a free line wire excepting for an acquired one so as to execute dial transmission through the free line wire at the time of detecting the no-response of the opposite party. CONSTITUTION:At the time of detecting a busy tone by way of a busy tone detection circuit 111, CPU 14 controls a line wire interface 11 to release the acuired line wires 3 and to detect and acquire the free line wire 3 connected to the line wire interface 11. After then, dial information stored in RAM 16 is read out and sent to the acquired line wire 3 as a dial signal. If the opposite party does not respond to it either, another line wire 3 is furthermore detected and acquired so as to similarly send the same dial number. When the opposite party does not respond to a call like this, the free line wire 3 is successively detected and acquired and redial transmission of outputting the same dial number is executed so as to connect to the opposite party as soon as the opposite party finishes a calling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone device having a self redial function for accommodating a plurality of external lines such as telephone lines and automatically repeating a redial operation via the accommodated external lines.

[0002]

2. Description of the Related Art In this type of key telephone device, a plurality of external lines and a key telephone are connected to a main unit, and when the main unit receives operation data based on a button operation from each key telephone, the received operation is performed. The exchange connection processing of the external line and the internal line is performed based on the data.

That is, for example, when an outside line is captured based on an outside line capturing operation of a key telephone, and subsequently a dial signal is transmitted from the outside line captured based on a dial operation, the other party is called. Then, the outside line communication state is set according to the response of the other party. However, when the other party is busy, a busy tone is returned, so the main device side once releases the captured external line, and after a certain period of time, automatically captures the same external line again, and then uses the stored dial number. The corresponding dial signal is sent to the captured outside line to call the other party. Such an automatic redial call function is called a self redial and is a convenient function. However, since the occupancy rate of the outside line is high, if the other party does not answer, it takes 3 minutes within 3 minutes including the first dial call. Calling up to once is allowed.

[0004]

By the way, at a reservation center that accepts tickets, golf course reservations, etc., reservation telephones from customers may concentrate at certain times and the reservation center becomes busy. In this case, if the user makes a call to the reservation center using the above-mentioned self-redial function, the above-mentioned number of allowable calls is reached before the center side can be connected, and as a result, there is a problem that the call must be made again and the efficiency is low. there were.

Therefore, an object of the present invention is to improve the line connection efficiency in a key telephone device having a self redial function.

[0006]

In order to solve such a problem, the present invention comprises a plurality of button telephones and a main unit for accommodating the plurality of button telephones and an outside line, and dials based on the operation of the button telephones. When information is received, dialing is performed through the captured outside line that was captured in advance, and if the other party does not respond, the outside line that is the same as the above-mentioned captured outside line is captured and automatically redialed a predetermined number of times within a predetermined time. In the key telephone device, when an unanswered call is detected during dialing and redialing, an empty outside line detecting means for detecting an empty outside line other than the outside line being captured, and an empty line detected sequentially by this empty outside line detecting means. A redial transmission control means for sequentially executing redial transmission via an outside line is provided. Further, an empty outside line detecting means for detecting an empty outside line at the time of making a redial call, and one empty outside line is sequentially selected from among the empty outside lines detected by the empty outside line detecting means, and the redial transmission is executed every predetermined time. A redial transmission control means that is activated by shifting is provided.

[0007]

[Function] When the other party's unanswered call is detected during dialing and redialing, vacant outside lines other than the outside line being captured are sequentially detected, and redialing is sequentially executed through the detected outside lines. . As a result, when a call is made to a reservation center, such as a ticket, which is flooded with incoming calls, using the self-redial function, the probability that the center side can be connected is increased, and thus the line connection efficiency is improved.
In addition, an empty outside line is detected at the time of redial transmission, and one empty outside line is sequentially selected from each of the detected free outside lines, and execution of redial transmission is shifted by a predetermined time and activated. As a result, the line connection efficiency is further improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a key telephone device according to the present invention. In the figure, reference numeral 1 is a main device, and a plurality of outside lines 3 _{1 to} 3 _n are connected to the main device 1 and a plurality of key telephones 5 _{1 to} 5 _m are connected to the respective lines 4 ₁ to 4 4.
connected through _m .

Here, the main device 1 is constructed as follows. That is, 11 _{1 to} 11 _n are external line interfaces that are interfaces with the external lines 3 _{1 to} 3 _n , 12 is a speech path switch, and 13 _{1 to} 13 _m are telephone interface that are interfaces with the key telephones 5 _{1 to} 5 _m. , 14 is a CPU for controlling the main device 1, 15 is a ROM for storing programs executed by the CPU 14, and 16 is a RAM for storing data and the like. Further, 17 is a holding IC that sends a holding melody to the outside line when the outside line is held, 18 is a PB receiver that receives a PB signal from the outside line via the outside line interfaces 11 _{1 to} 11 _n and the speech path switch 12, 19
Reference numerals 20 and 20 are a recording / reproducing IC and a cassette mechanical section for outputting a message to a partner and recording a message from the partner when this device is used as an answering machine.

Each external line interface is provided with a BT detection circuit 111 for detecting a busy tone (BT) arriving at each external line, and an external line capture (not shown) for closing a DC loop of the external line. A circuit, a dial sending circuit and the like are provided. Also, the key telephone 5
Communication circuit 51, transmission circuit 5 for performing data transmission with main device 1
4, a control unit 55 for controlling the key telephone 5, a display circuit 56, a keyboard 57 and the like.

When the off-hook operation is performed on the key telephone 5, the control unit 55 detects the off-hook from the state of the hook switch HS and transmits the off-hook information to the main unit 1 via the transmission circuit 54, and then the keyboard 57. When the operation of the outside line button is detected, this operation information is transmitted to the main device 1. In this case, when the CPU 14 of the main device 1 receives this outside line button operation information via the telephone interface, it controls the corresponding outside line interface to capture the outside line.

After that, when the dial button of the keyboard 57 of the key telephone 5 is operated, the control unit 5
5 detects this and transmits it to the main unit 1 as dial information, and when the CPU 14 of the main unit 1 receives this dial information, it stores it in the RAM 16 and controls the corresponding external line interface to generate a corresponding dial signal. Send it to the outside line that was generated and captured. The dialing signal is sent to the outside line to call the other party, and the outside line communication state is set by the other party's response.

However, when the other party is in a call and does not respond, a busy tone is sent from the exchange (not shown) to the acquisition outside line. In such a case, there is a telephone device provided with a function called self redial, in which a captured outside line is once released and a redial transmission is automatically made through the same outside line after a predetermined time. However, since the self-redial function has a high occupancy rate of outside lines, there is a limit of three calls within three minutes including the first dial call, and it is not possible to quickly connect to the other party.

Therefore, when the CPU 14 of the present apparatus detects a busy tone through the BT detection circuit 111, it controls the external line interface to open the captured external line and also detects an empty external line connected to another external line interface. To capture. After that, the dial information stored in the RAM 16 is read out and sent as a dial signal to the captured outside line. And in this case too, if the other party does not respond,
Further, another vacant outside line is detected and captured, and the same dial number is similarly sent out. In this way, when the other party does not respond, by sequentially detecting and capturing an available outside line and outputting the same dial number, it is possible to immediately connect to the other party when the other party ends the call. The line connection efficiency can be improved.

FIG. 2 is a timing chart showing the operation of the first embodiment of the present apparatus which performs such self redialing. That is, first, the outside line 3 ₁ is captured at the timing shown in FIG. 2A, and a dial signal is transmitted through the outside line 3 ₁ as the first dial transmission. When the other party's busy response is detected, the outside line 3 ₁ is opened. Then, the idle state of the outside line 3 ₂ is detected, and if it is the idle state, the outside line 3 ₂ is immediately captured and the second dial transmission is automatically performed [FIG. 2 (b)]. Also in this case, if the other party does not respond, the external line 3 ₂ is opened, the free state of the external line 3 ₃ is checked, and immediately after that, the third dial call is automatically made through the external line 3 ₃ [Fig. c)]. If there is no response from the other party during this third dialing, the outside line 3 ₃
Open up.

At this point, the empty outside lines are outside lines 3 _{1 to} 3
If ₃ of 3 lines, select external line 3 _1, the outside line 3 ₁
A fourth dial call is made via the [Fig. 2 (a)].
When the other party responds, the call is established and the redial operation is stopped. If the other party is still busy due to a call state or the like, the redial transmission operation is continued through another vacant outside line. Then, such redial transmission operation is continued until it reaches three times in three minutes per outside line.

Next, FIG. 3 is a flow chart summarizing the operation of the CPU 14 for performing the above-mentioned self redial. That is, after the first dial call, if there is no response from the other party, an empty outside line is captured in step ST1 and a redial call is automatically performed as the second dial call in step ST2. In this case, if the other party is busy and it is determined to be "Y" in step ST3, step S
At T4, this outside line is opened, and at the same time, at step ST5, another empty outside line is captured. Then, returning to step ST2, the third dial transmission is automatically performed.

Next, FIG. 4 is a timing chart showing the operation of the second embodiment. In this embodiment, when a redial call is made, a free state of each outside line is detected, and when a plurality of outside lines are available, after a fixed time elapses after the dial transmission to the first available outside line is started, the second line is opened. Send the same dial to the available outside line. That is, the same dial number is sequentially transmitted to the vacant outside line before the busy tone is detected by transmitting the dial signal to further improve the connection efficiency with the other party.

[0019] That is, as shown in FIG. 4 (a), outside line 3 ₁
It sends out the first dial number via, if in this case to select a free external vacant outside line 3 ₂ activates the next external line captured timer described later. Then, when the next outside line acquisition timer times out, as shown in FIG. 4 (e), an empty outside line 3 ₂ is acquired and a second dial call is made. At the same time when the dialing to the outside line 3 ₂ is performed, the free outside line is detected, and the next outside line capturing timer is started, and when this timer times out, the available outside line 3 ₃ is captured and the third dialing transmission is performed.

In this case, on the exchange side, for example, after receiving the dial transmitted from the outside line 3 _{1 of the} present apparatus,
As shown in (b), it takes up to 1.5 seconds to connect to the partner terminal, and then as shown in FIG. 4 (c), it takes up to 2 seconds to detect busy of the partner terminal. ing. After that, as shown in FIG. 4 (d), the busy tone is returned to the outside line 3 _{1 of} this apparatus. In the first embodiment described above, it is performed to capture the other free external from the detection of the busy tone sent from the switch redial, in the present embodiment after completion transmission of dial outside line 3 _1, 4 (C)
The time of the next outside line acquisition timer is set so that the dial transmission of the next outside line 3 ₂ shown in FIG. With this configuration, it is possible to further improve the connection efficiency with the other party as compared with the first embodiment described above.

[0021] When detecting a busy tone indicating an opponent not respond by dialing from an outside line 3 ₁ 4 seconds to open the outside line 3 _1, as shown in FIG. 4 (a), it activates the self-redial wait timer. Then, after the time-out of the self-redial waiting timer, the outside line 3 ₁ becomes 2
Send the dial for the second time. In this way, when the other party does not respond, the redial transmission is permitted three times for each outside line for three minutes by the three-minute timer separately provided for each outside line. Further, in this way, when the other party's response is detected during redial transmission using a plurality of external lines or for redial transmission from an external line, for example, by a reversal signal, etc., redial transmission of other external lines is stopped, and Open the outside line. When the other party has a plurality of telephone numbers, the telephone numbers may be alternately transmitted.

[0022]

As described above, according to the present invention, when an unanswered call is detected at the time of dialing and redialing, an empty outside line other than the outside line being captured is sequentially detected and this detection is performed. Redial dialing is performed sequentially through each available outside line, so if you use the self-redial function to make a call to a reservation center that is flooded with incoming calls, for example, the probability that you can connect to the center side will increase. Therefore, there is an effect that the connection efficiency of the line is improved. In addition, when a redial call is made, a free line is detected, and one free line is sequentially selected from the detected free lines so that the redial transmission can be started by staggering by a predetermined time. There is an effect that the connection efficiency of is further improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a key telephone device according to the present invention.

FIG. 2 is a timing chart showing the operation of the first embodiment of the apparatus.

FIG. 3 is a flowchart showing the operation of the first embodiment of the apparatus.

FIG. 4 is a timing chart showing an operation of the second embodiment of the above apparatus.

[Explanation of symbols]

1 Main device 3 _{1 to} 2 _n Outer line 5 _{1 to} 5 _m Button telephone 11 _{1 to} 11 _n Outer line interface 12 Call path switch 13 _{1 to} 13 _m Telephone interface 14 CPU 16 RAM 51 Call circuit 54 Transmission circuit 55 Control unit 111 BT detection circuit

Claims (2)

[Claims] 1. A dial call is made through a captured outside line that is preliminarily captured when receiving dial information based on the operation of the button telephone, which comprises a plurality of button telephones and a main device that accommodates the plurality of button telephones and an outside line. In addition, when the other party does not respond, the key telephone device that captures the same outside line as the captured outside line and automatically redials a predetermined number of times within a predetermined time. When a response is detected, an empty outside line detecting means for detecting an empty outside line other than the outside line being captured, and a redial transmission control means for sequentially executing redial transmission through the empty outside lines sequentially detected by this empty outside line detecting means. Button telephone device characterized by being provided. 2. A dial call is made through a captured outside line which is composed of a plurality of button telephones and a main device for accommodating the plurality of button telephones and an outside line, and which is captured in advance when dial information based on the operation of the button telephone is received. In addition, when the other party does not respond, the button telephone device that captures the same outside line as the captured outside line and automatically makes a redial call a predetermined number of times within a predetermined time, detects an empty outside line during the redial call. There is provided an empty line detection means and a redial transmission control means for sequentially selecting one empty line from the free line detected by the empty line detection means and activating the redial transmission by shifting the execution of the redial transmission every predetermined time. Button telephone device characterized by the above.