JPH0142181B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone connected to a private branch exchange and equipped with an automatic dialing function.

2. Description of the Related Art Recently, the development of accessories or devices for telephones has become more active, and telephones equipped with automatic dialing functions such as repertoire re-dial function or re-dial function have appeared. What is the repertoire redial function? When calling a specific subscriber,
A function that automatically sends a dial signal by operating an operation button that corresponds to the subscriber's telephone number. In addition, the redial function memorizes the phone number of the person you dialed once.
A function that automatically dials a telephone number when a button is pressed. The former function is useful when calling a subscriber who calls frequently, and the latter function is useful when the called party is busy and you want to try calling again.

Among telephones equipped with such an automatic dialing function, in rotary dial telephones, the impulse speed is set to a speed prescribed by the switching network. Furthermore, the pause time between each impulse train is also set to a predetermined time that is longer than the specified minimum pause time. Further, in a push-button dial telephone, both the signal sending time and the minimum pause time are set to predetermined times that satisfy specified values.

Therefore, there is no problem when a telephone equipped with such an automatic dialing function is connected to a general subscriber line (hereinafter referred to as an office line), but if it is connected to a subscriber line of a private branch exchange facility (hereinafter referred to as an extension line), there is no problem. If
There are the following problems. That is, when making a call from an extension to a central office line, the telephone first dials a central office line calling number assigned with the numbers 0 or 9, and has the local exchange acquire the central office line. After acquiring the central office line, the called party's number is dialed from this telephone, and the called party's number is received by the exchange of the general telephone network connected to the telephone. Therefore, if the specific number for acquiring the central office line and the called party's number are sent continuously from the telephone at the above-mentioned intervals, the time usually required for the private branch exchange to acquire the central office line is 1 to 2 seconds. Can not do it.

For this reason, in conventional telephones of this type, when storing a telephone number, information for interrupting dialing was stored next to the central office number, and then the called party number was stored. When making a call, the central office line dialing number is first automatically transmitted, then subsequent dialing is stopped, and when the user confirms that the central office line has been acquired, the user presses an operation button to transmit the called party's number. Steps were taken to make it happen.

Therefore, in addition to the normal operation buttons, such a telephone requires an operation button for storing information for interrupting dial transmission, and an operation button for starting transmission of the called party number after dial transmission is interrupted. This led to an increase in the price and larger size of telephones. Furthermore, there is a drawback that the operation of the telephone becomes complicated when storing a telephone number in the telephone and when dialing a telephone number.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a telephone that can perform automatic dialing in the same manner as a telephone connected to a general exchange network.

In the present invention, when a private branch exchange acquires a central office line, a predetermined transmission suspension period is set by a timer, and dial transmission is automatically stopped during this transmission suspension period, thereby achieving the above-mentioned object.

The present invention will be explained in detail with reference to Examples below.

Referring to FIG. 1, which shows an embodiment of the present invention, the case where the redial function is used will first be described.
When a caller attempting to make a call from an extension to a central office line picks up a handset (not shown), a switch 11 is activated and the first digit detection circuit 12 is set by its output. In this state, the caller operates the dial keypad 13 and inputs the dial number in order starting from the first digit.

When the caller dials the first digit, the resulting dial information is supplied to the control circuit 14. The control circuit 14 writes the supplied dial information to the re-dial address in the memory 15 and supplies it to the dial oscillation circuit 16 to convert it into a corresponding dial signal and send it to a private branch exchange (not shown).

Incidentally, the dial information generated from the dial keypad 13 is also supplied to the first digit detection circuit 12. The first digit detection circuit 12 is reset by the falling edge of the first digit dial information, and supplies this reset information to the control circuit 14. As a result, the control circuit 14 generates special information that does not correspond to any dialed number, and writes this to the re-dial address in the memory 15.

When the operator dials the second and subsequent digits, the dial information generated sequentially is also supplied to the control circuit 14, sequentially written to the re-dial address in the memory 15, and supplied to the dial oscillation circuit 16. The signals are sequentially converted into corresponding dial signals and sent out. Since the first digit detection circuit 12 has already been reset at the stage when the dial operation for the second and subsequent digits is performed, the control circuit 14 does not generate the above-mentioned special information.

FIG. 2 shows the arrangement of re-dial addresses within the memory 15. When the caller operates the dial keypad and enters the outside line dialing number "0" and the called party's telephone number "12345...", the first
Dial information regarding the central office line calling number "0" is written in the th address 21. Further, special information "x" generated by the control circuit 14 is written to the second address 22. Furthermore, called party numbers "12345..." are sequentially written into the third and subsequent addresses 23.

Now, when the calling party completes the dialing operation, the exchange performs a connection operation based on the dial signal sent from the dial oscillation circuit 16. As a result, if the called party is busy or absent, the calling party hangs up the handset for a while, then picks up the handset again and tries to make a call. At this time, the caller does not operate the dial keypad 13, but instead presses the redial button 17 to generate a redial signal.

When the control circuit 14 detects this re-dial signal, it sequentially reads out the contents of the re-dial addresses in the memory 15 starting from the first address 21. The special information detection circuit 20 checks whether the read information is the above-mentioned special information "x". As a result, if the special information is not "x", that is, if it is dial information related to the central office number or the called party's number, no special output will be produced.
The dial oscillation circuit 16 then generates a dial signal corresponding to the information supplied from the control circuit 14 and sends it to the private branch exchange.

On the other hand, if the read information is special information, an output signal is generated, causing the control circuit 14 to immediately stop reading information from the memory 15 and starting the timer 18.

The timer 18 is set to a time longer than the time required for the private branch exchange to acquire the central office line and as short as possible. In this embodiment, the set time of the timer 18 (hereinafter referred to as the transmission pause period) is set to 2 seconds. When the timer 18 measures the transmission period after activation, it generates an output signal and supplies it to the control circuit 14. The control circuit 14 thereby starts reading information from the memory 15, which has been paused. As a result, the dial information from the second digit onward is transmitted to the dial oscillator circuit 1 after a two-second pause period after sending the dial information for the first digit.
6, and the called party is re-dialed.

Next, the case of using the repertoire redial function will be explained. In this case, the user of the telephone uses the dial keypad 13 to write in advance the telephone numbers of a plurality of other parties in the repertoire dial address in the memory 15. In this case the first
The digit detection circuit 12 detects the first digit of the telephone number and writes special information between the first digit dial information and the second digit dial information. This is the same as in the redial address.

When the telephone user dials a subscriber whose telephone number has been stored in advance in this way, the user presses the repertoire dialing button 19 and performs abbreviated dialing to further specify the subscriber. As a result, the contents of the predetermined repertoire dialing address are read out in the same manner as in the case of redialing described above, and the dialing of the other subscriber is performed.

In the embodiment described above, while a pause period is automatically taken when making a call to an extension, there is an advantage that many telephones do not need to be changed at all when changing the central office line calling number of the private branch exchange. .

As explained above, according to the present invention, when a central office line is captured, a timer is used to set a certain transmission pause period and the transmission of dialing signals is temporarily stopped, so that the caller can notify that the central office line has been captured. There is no need to check on the receiver. Further, according to the present invention, although the circuit configuration for automatic dialing becomes somewhat complicated, all of the increased circuitry can be realized by a logic circuit or a microcomputer. Therefore, it is possible to reduce the cost of the device by considering the use of ICs for these circuits, reducing the number of switches, and downsizing the device. Further, when dialing, a digit detection operation is not required, and the operational load on the control circuit when dialing can be reduced.

In the embodiment, a case has been described in which the suspension period for dialing signal transmission is inserted between the first and second digit dialing signals, but in general, the digits corresponding to the number of digits of the central office line originating number of the private branch exchange are used. It is inserted after the dial signal, and is not limited to the embodiment.

Further, in the above embodiment, there is a problem in that a transmission pause period is provided even when connected to an extension line, but this can be easily solved by providing a switch for selecting whether to insert or not insert a pause period.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main parts of a telephone according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining the contents of a re-dial address in the memory in this embodiment. 12...First digit detection circuit, 13...Dial keypad, 14...Control circuit, 15...Memory, 16...
Dial oscillation circuit, 18...timer, 20...special information detection circuit.

Claims (1)

[Scope of Claims] 1. A memory that stores dial information and special information corresponding to a telephone number as a series of information; and when writing the dial information corresponding to a telephone number to the memory in response to a dial operation,
digit detection means for detecting between predetermined digits of the dial information; and automatically inserting the special information between the detected predetermined digits, and storing the dial information and the special information in the memory as a series of information. a writing means for writing; a dialing signal generating means for transmitting a dialing signal based on the dialing information stored in the memory; a timer for setting a certain period of time required for the private branch exchange to acquire the central office line; A series of information stored in the memory is sequentially read out digit by digit, and if it is determined to be the dial information, it is supplied to the dial signal generating means, and if it is determined to be the special information, it is set by the timer. 1. A telephone set comprising: control means for stopping transmission of dialing signals based on continuous dialing information until a predetermined period of time has elapsed.