JPS607253A - Recalling system - Google Patents

Abstract

PURPOSE:To attain the use of called number automatic retransmitting function in case of trunk line automatic outgoing when an extension telephone set of an automatic private branch exchange is used by providing a means storing information representing a pause time between digits of a called number transmitted from a telephone terminal device, and setting an inter-digit pause time in retransmitting automatically the said called number based on the said information. CONSTITUTION:Information representing either a trunk line outgoing interdigit pause time or normal inter-digit pause time is stored repsectively in each digit of an identification number for trunk line outgoing and a called number dialed by a subscriber just before is stored in a number storage circuit 7', a transmission control circuit 9' selects and starts a pause time generating circuit 10 or a pause time generating circuit 12 based on the said information and sets the trunk line outgoing inter-digit pause time or the normal inter-digit pause time. Thus, the called number is transmitted after the trunk line automatic outgoing is conducted and after a subscriber telephone station exchange completes surely call start connection, and the connection to the calld party is set surely.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a telephone terminal device equipped with a called party number automatic retransmission function, and in particular to a telephone terminal device having a called party number automatic retransmission function. Background of the Technology As part of the advancement of the functionality of telephone terminal equipment, a recall method (bl) that is set to A telephone terminal device equipped with a so-called called party number automatic resending function that allows the calling party number to be automatically retransmitted has been put into practical use.

(C) Prior Art and Problems FIG. 1 is a diagram showing an example of a conventional recall method in this type of telephone terminal device. In FIG. 1, a telephone circuit 3 comprising a transmitter 1 and a receiver 2 is connected to a subscriber line 4 and is equipped with a known dial pulse sending function.

When the subscriber tone is now activated and the called party's number is dialed by operating a dial (not shown) included in the telephone circuit 3, a dial pulse corresponding to the called party's number is sent to the subscriber line 4. The counting circuit 5 counts the dial pulses sent from the telephone circuit 3 to the subscriber line 4. Further, the inter-digit identification circuit 6 monitors the pause time between dial pulses, and when the pause time exceeds a predetermined time, it is determined to be an inter-digit pause time, and the count value of the counting circuit 5 is stored in the number storage circuit 7. . Thus, when the subscriber has finished dialing the called party number, all the called party numbers are stored in the number storage circuit 7. Once the subscriber has been restored, if he wants to call the party he dialed just before again, he does not press the re-call button 8 instead of dialing the number of the called party. As a result, the sending control port 9 is activated, and the called party number stored in the number storage circuit 7 is sequentially read out.
The digit address is extracted and a dial pulse is sent to the subscriber line 4 via the telephone circuit 3.

When the - digit dial pulse has been sent out, the sending control circuit 9 activates the pause time generating circuit 10. The pause time generation circuit 10 typically generates a predetermined inter-digit pause time (for example, 600 milliseconds) that guarantees reliable switching operation of the automatic exchange,
It is supplied to the sending control circuit 9. The sending control circuit 9 stops sending out the dial pulse while the inter-digit down time is supplied from the down time generation circuit 10, and then starts sending out the dial pulse for the next digit. By repeating the above process for all called party numbers, the previously dialed called party is automatically called again.

As is clear from the above description, in a conventional recall system, the inter-digit pause time of the dial pulse sent when the recall button 8 is operated is determined by a predetermined time period generated by the pause time generation circuit 10 (e.g. 600 milliseconds). However, for example, when an extension subscriber of an automatic private branch exchange makes an automatic call to a central office line, after dialing the identification number (for example 0) for calling the central office line, the subscriber central office exchange completes the calling connection and then returns the call. After hearing the dial tone, you must dial the called party number. Therefore, when establishing an automatic central office line connection by automatically transmitting a dial pulse, the subscriber central office exchange must be It is necessary to set an inter-digit pause time (hereinafter referred to as central office line originating inter-digit pause time) of, for example, 3 seconds or more, which is sufficient to guarantee the completion of the call connection. Therefore, even if a telephone terminal device such as the one described above is used as an extension telephone of an automatic private branch exchange and an attempt is made to make an automatic call connection to the central office line by operating the recall button 8, the pause time generation circuit 10 generates a pause between energized digits. The time (600 milliseconds) is insufficient for the pause time between digits of the central office line, and there is a risk of erroneous connection.

(d) Object of the Invention The object of the present invention is to eliminate the disadvantages of the conventional recall system as described above, and to enable the called party number to be kept even when this type of telephone terminal device is used as an extension telephone of an automatic private branch exchange. It is an object of the present invention to realize a means for reliably enabling automatic transmission and connection to a central office line using an automatic retransmission function.

(el) Structure of the Invention This object is to provide a telephone terminal device equipped with a called party number automatic retransmission function with means for storing information indicating the inter-digit pause time of the called party number transmitted from the telephone terminal device. ,
This is achieved by setting an inter-digit pause time when automatically retransmitting the called party number based on this information.

(fl　Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram illustrating a recall method according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, a dark value circuit 11 and a pause time generation circuit 12 are provided.

The dark value circuit 11 generates a guaranteed value (3 seconds in the example) of the inter-digit pause time of the central office line transmission in the automatic private branch exchange and supplies it to the inter-digit discrimination circuit 6'', and the pause time generation circuit 12 A station line transmitting inter-digit deadlock time greater than or equal to the guaranteed value is generated and supplied to the transmission control circuit 9'.It is also assumed that the telephone terminal device is housed in an automatic private branch exchange as an extension telephone.

In FIG. 2, when a subscriber makes a call and dials the central office line automatic calling identification number followed by the called party number, the counting circuit 5
counts the dial pulses sent from the telephone circuit 3 to the subscriber line 4 in the same way as shown in FIG. In addition, the inter-digit discrimination circuit 6° monitors the pause time between dial pulses, and determines that the pause time exceeds a predetermined time as the inter-digit pause time,
The count value of the counting circuit 5 is stored in the number storage circuit 7''.

The inter-digit identification circuit 6'' monitors the inter-digit pause time until the next digit dial pulse starts, and the inter-digit pause time reaches the guaranteed value (3 seconds) transmitted from the dark value circuit 11. The subscriber first receives the central office line calling identification number (0
), the inter-digit identification circuit 6° determines that the inter-digit pause time is greater than or equal to the guaranteed value (3 seconds), and the counting circuit The count value (0) of 5 and information indicating the pause time between digits of the station line transmission are stored in the number storage circuit 7°. Subsequently, the interdigit identification circuit 6' determines that the pause time between digits of the called party number that the subscriber dials is less than the guaranteed value (3 seconds) supplied from the dark value circuit 11, The circuit 6' stores the count value of the counting circuit 5 as well as information indicating the normal inter-digit pause time in the number storage circuit 7''. The central line originating identification number with information indicating the interdigit pause time and all called party numbers, each with information indicating the normal interdigit pause time, are stored in the number storage circuit 7°. Once restored, if you want to call the previously dialed party again, call again button 8.
When you press , the sending control circuit 9' is activated and the number storage circuit 7 is activated.
The central office line calling identification number with the information indicating the pause time between the central office line calling digits, which is initially stored in ', is extracted, and a dial pulse is sent to the subscriber line 4 via the telephone circuit 3. After the central office line transmission identification number has been transmitted, the transmission control turn pause time generation circuit 12 is activated, and while the pause time generation circuit 12 supplies the station line transmission inter-digit pause time (3 seconds or more), Stops sending the dial pulse for the next digit. After the station line originating inter-digit pause time has elapsed, the transmission control circuit 9° extracts the first digit of the called party number with information indicating the normal inter-digit pause time from the number storage circuit 7' and transmits the telephone circuit to the telephone circuit. 3 to the subscriber line 4. When the first digit dial pulse has been sent out, the sending control circuit 9' activates the pause time generation circuit 10 based on the cancellation that indicates the normal inter-digit pause time.
The pause time generation circuit 10 calculates the pause time between energized digits (600
After stopping the transmission of dial pulses while t seconds) is supplied, transmission of dial pulses for the next digit is started. By repeating the above process for all called party numbers, the previously dialed called party is automatically called again.

As is clear from the above explanation, according to the present embodiment, the number storage circuit 71 stores each digit of the central office line calling identification number and overlapping number that the subscriber has dialed immediately before the central office line calling identification number and the overlapping one-digit number. Information indicating either the time or the normal inter-digit pause time is stored together, and when sending out dial pulses, the sending control circuit 9' activates the stopping time generating circuit 10 or the stopping time generating circuit 12 based on this information. Select and launch
Set the inter-digit pause time for station line transmission or the normal inter-digit pause time. Therefore, after the subscriber central office exchange reliably completes the calling connection after the automatic call is made to the central office line, the called party number is sent out, and the connection to the called party is reliably established.

It should be noted that FIG. 2 is only one embodiment of the present invention, and for example, number storage times! ? 87' is not limited to storing information indicating either the inter-digit pause time for station line transmission or the normal inter-digit pause time for each digit. Although many modifications may be considered to store only the information shown, the effects of the present invention will not change in any case.Furthermore, the configuration of the telephone terminal device is not limited to that shown in the drawings. Numerous other modifications may be considered, but the effects of the present invention will not change in any case.Also, the values of the normal interdigit pause time and the central office line transmission interdigit pause time are 600 milliseconds and 600 milliseconds, respectively. The time period is not limited to 3 seconds or more, and many other modifications may be considered, but the effects of the present invention remain the same in any case.Furthermore, the present invention is directed to automatic exchange of central office lines from automatic private branch exchanges. Needless to say, this is not limited to outgoing connections.

(Shin) Effects of the Invention According to the present invention, when the telephone terminal device is used as an extension telephone of an automatic private branch exchange, the called party number automatic retransmission function can be used when automatically dialing a central office line. , the uses of the telephone terminal device are expanded.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional recall method for this type of telephone terminal device, and FIG. 2 is a diagram showing a recall method according to an embodiment of the present invention. In the figure, 1 is a transmitter, 2 is a receiver, 3 is a telephone circuit,
4 is a subscriber line, 5 is a counting circuit, 6 and 6' are interdigit identification circuits, 7 and 7'' are number storage circuits, 8 is a recall button,
9 and 9° indicate a sending control circuit, 10 and 12 a pause time generation circuit, and 11 a dark value circuit.

Claims (1)

[Claims] A telephone terminal device equipped with a called party number automatic retransmission function is provided with means for storing information indicating an inter-digit pause time of a called party number transmitted from the telephone terminal device, and based on the information, the called party number is A recall method characterized by setting a pause time between digits when automatically retransmitting a number.