JPH09307620A - Telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To send a called subscriber telephone number after transmission of a dial tone to an exchange even in the case of the called subscriber telephone number dialed before the transmission of the dial tone from the exchange. SOLUTION: A dial tone sent from an exchange to a telephone set 1 is detected by a dial tone detection section 21, a called subscriber telephone number entered by a dial-key from a dial key section 22 independently of the detection is temporarily stored in a memory section 23 under the control of a dial transmission control section 24 and read first from the memory section 23 under the control of the control section 24 after awaiting a dial tone detection output from the dial tone detection section 21 and sent to the exchange. Thus, wrong dialing is surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention surely prevents the transmission of a called subscriber's telephone number to the exchange, which is cited as one of the causes of a wrong telephone call, before the transmission of a dial tone from the exchange. The telephone number of the called subscriber is read out through the temporary telephone number storage means for the first time, after waiting for the dial tone sent from the exchange to be detected, especially when the telephone is off-hook. The present invention relates to a telephone set to be sent to.

[0002]

2. Description of the Related Art In general telephones, when a user picks up a handset (handset) and the telephone goes to an off-hook state, this is detected by an exchange that monitors the subscriber line state at regular intervals. In addition, as a response, a dial tone (dial tone (400 Hz continuous audible tone): DT) indicating that the exchange is ready to receive dial information from the telephone is sent from the exchange to the subscriber telephone line. It is intended to be transmitted via. Therefore, in principle, the user is required to listen and confirm the dial tone from the handset and then dial the telephone number of the called subscriber (telephone number of the called party).

[0003] Incidentally, as a document relating to a so-called wrong telephone, "Hello Information" (199) issued by Nippon Telegraph and Telephone Corporation so far, for example.
February 6th, No. 30). If this is the case,
Aside from the case where the called party number itself is erroneously dialed in, if the called party telephone number is dialed in from the telephone before the dial tone is sent from the exchange,
That is what was cited as one of the causes of the wrong call.

[0004]

As described above, when the user dials in the telephone number of the called subscriber from the telephone, it is necessary to confirm the dial tone from the exchange and then dial. However, in the normal case, the confirmation of hearing is almost unnecessary. This is because when the telephone is off-hook, a dial tone is immediately sent to the telephone from the exchange. Therefore, in most cases, no inconvenience occurs even if the called subscriber's number is dialed in because the confirmation of listening to the dial tone is unnecessary.

By the way, the exchange performs the exchange control process. Except when the processing load is excessively large, even if the exchange tone allows transmission of a dial tone within a predetermined time, it does not occur. If it is too large, the transmission timing of the dial tone often tends to be delayed, and in fact, the transmission timing may be delayed due to some factor than usual, or the called party may be extremely early after off-hook. It is also described in the above-mentioned document that inconvenience occurs when a telephone number is dialed in. Specifically, for example, in order to call a called subscriber resident in the 23 wards of Tokyo from an area outside the 23 wards of Tokyo, for example, Yokohama, "03-3591-4414" is dialed as the called subscriber's telephone number. Assuming that the dial tone is sent from the exchange immediately after the first “0” indicating the area code is dialed, it is assumed that the current exchange will call from Yokohama in the telephone number plan. In this case, it can be considered that "335-9144" is received, in which the last two digits "14" are ignored as the called subscriber's telephone number. Therefore, the telephone number is called as the called subscriber's telephone number. If the callee actually exists in the same city, the called subscriber was mistakenly called. Such a phenomenon, that is, a wrong phone call, is often made in order to promptly respond to a request from a TV program or a radio program.
This is especially likely to happen when a specific called subscriber's telephone number is intensively dialed in by a large number of ordinary viewers within a certain time, and it is a great nuisance to the wrongly called subscriber. There is nothing else. However, when calling a called party residing in the same city, the number of digits of the called party telephone number is obviously insufficient even if the first dialed digit cannot be received by the exchange. Therefore, a phenomenon such as a wrong call does not occur, and after a silent state continues for a predetermined time (about 20 seconds), for example, a busy tone (busy tone: BT) is transmitted from the exchange. An object of the present invention is to provide a telephone in which transmission of a called subscriber's telephone number to the exchange is reliably prevented before transmission of a dial tone from the exchange.

[0006]

SUMMARY OF THE INVENTION The above-described object is to temporarily store, in an existing telephone, a dial tone detecting means for detecting a dial tone from an exchange and a called party telephone number dialed by a dial key. While temporarily storing the telephone number temporary storage means and the called subscriber telephone number dialed in the telephone number temporary storage means in sequence, the telephone is waited for the dial tone detection output from the dial tone detection means, This is achieved by at least including a dial sending control means for sequentially reading the called subscriber telephone numbers from the number temporary storage means in the order of input and for controlling the sending to the exchange.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG. First, a functional block configuration of a main part of a telephone according to the present invention will be described. FIG. 1 shows a configuration example thereof. As shown in the figure, the telephone 1 has a dial tone detecting section 21 for detecting a dial tone from an exchange (not shown) and a key input from a dial key section (existing) 22 as components directly related to the present invention. The memory unit 23 for temporarily storing the called telephone number of the called subscriber in a FIFO manner, and the telephone number of the called party from the dial key unit 22 are temporarily stored in the memory unit 23 in the order of input, while the dial tone is detected. Waiting for the dial tone detection output from the unit 21, a dial sending control unit 24 is newly provided for sequentially reading out the called subscriber telephone numbers from the memory unit 23 in the order of input and sending the number to the exchange. On the other hand, as the existing components, in addition to the dial key section 22, the telephone circuit 12 and the handset (the telephone circuit 12 is accommodated through the cord 3 and the transmitter 111 and the receiver 1).
12 is built in) 11, a hook switch 13, a bell portion 14 and the like. Among these components, the dial tone detection unit 21 determines the frequency component (400H) of the dial tone.
z component) detecting means (capacitor, rectifying circuit, photocoupler, integrating circuit, etc.), dial key section 22 is a dial key or the like, bell section 14 is a speaker or the like, and memory section 23 is a RAM (random access memory). )
Therefore, the dial sending control unit 24 can be specifically configured by a microprocessor or the like.

The operation of the telephone 1 when it is off-hook will be described below. That is, although the telephone set 1 is accommodated in the exchange through the subscriber telephone line 2, the user picks up the handset 11,
When the telephone set 1 shifts to the off-hook state, a direct current loop is formed between the telephone set 1 and the exchange. This fact is detected by the exchange and, in response, a call is made from the exchange to the telephone set 1. The sound is to be sent out through the subscriber telephone line 2. On the other hand, in the telephone 1, the dial tone from the exchange can be detected by the dial tone detector 21. Regardless of this, the dial key 22 allows the user to enter the telephone number of the called subscriber. It is supposed to be entered using dial keys. The called subscriber telephone number input by the dial key is temporarily stored in the memory unit 23 sequentially in the order of input under the control of the dial transmission control unit 24, while the called subscriber telephone number temporarily stored in the memory unit 23 is stored. The person's telephone number waits for the dial tone detection output from the dial tone detector 21, and is controlled by the dial sending controller 24.
After being sequentially read from the memory unit 23 in the order of input for the first time,
It is sent to the exchange through the telephone circuit 12. Therefore, in general, although the called subscriber's telephone number is sequentially stored in the memory unit 23, the called subscriber's telephone number is sequentially stored in the memory unit 23 with a slight time delay. It has been read. In this way, after waiting for the dial tone detection output from the dial tone detector 21, the telephone numbers of the called subscribers are sequentially read from the memory unit 23 and sent to the exchange. It can be surely prevented that the called subscriber's telephone number is sent to the exchange before sending the dial tone, and therefore, it is possible to reliably prevent a wrong telephone call by sending the called party's telephone number to the exchange before sending the dial tone. That is being prevented.

The operation thereafter will be described. Waiting for visual confirmation, when the dial input by the user is started, transmission of a dial tone from the exchange to the telephone 1 is stopped. Waiting for completion of reception of the called subscriber's telephone number, the called party is called directly and indirectly from the exchange by the ringing signal (ringing: RG). While the calling is being made,
A ring back tone (RBT) indicating that the called subscriber is ringing is transmitted from the exchange to the telephone 1, so that the user can hear the ring tone from the handset 112. It has become a thing. However, at that time, when the called subscriber is in a call state, a busy tone (busy tone: BT) is heard instead of the ringing tone. 1 is placed in an on-hook state, and after an appropriate time has elapsed, the user again inputs a dial from the telephone 1. Eventually, if the called party answers the call from the exchange, the call path is set up with the called party for the first time, and the user can talk with the called party. It is said that. If either one of the telephones is put into the on-hook state with the end of the call, the line restoration process is being performed by the exchange.

[0010]

As described above, according to the first aspect of the present invention, the sending of the called subscriber's telephone number to the exchange is reliably prevented before the transmission of the dial tone from the exchange. The inconvenience caused by sending the called subscriber's telephone number to the exchange before sending the dial tone from the telephone can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a functional block configuration of essential parts in an example of a telephone according to the present invention.

[Explanation of symbols]

1 ... Telephone, 11 ... Handset, 12 ... Telephone circuit,
13 ... Hook switch, 14 ... Bell part, 21 ... Dial tone detection part, 22 ... Dial key part, 23 ... Memory part, 24 ...
Dial transmission control unit, 111 ... Transmitter, 112 ... Receiver

Claims (1)

[Claims] 1. A telephone set which is surely prevented from sending a called subscriber's telephone number to the exchange, which is one of the causes of a wrong telephone call, before the transmission of a dial tone from the exchange, A dial tone detection means for detecting a dial tone from the exchange, a telephone number temporary storage means for temporarily storing the dialed telephone number of the called subscriber sequentially in the order of input, and a dial key input for the telephone number temporary storage means. While the telephone numbers of the called subscribers are temporarily stored, the telephone numbers of the called subscribers are sequentially read from the telephone number temporary storage means in the order of input while waiting for the dial tone detection output from the dial tone detection means. And a dial sending control means for controlling sending to the exchange.