JPH07154463A - Automatic dp/pb switching system - Google Patents

Abstract

PURPOSE:To dial a DTMF signal by automatically changing a system to a dial pulse(DP) system when a telephone number is dialed, and automatically changing the system to a push-button system after a telephone line is connected. CONSTITUTION:A control circuit 105 judges the telephone number when it is dialed from the information of a hook switch 106 and a dial tone detection circuit 107, and switches a DP/PB switching circuit 104 to a DP dial circuit 102 side, and judges it from the information of the hook switch 106 and a ring back tone detection circuit 108 after the telephone line is connected, then, changes the DP/PB switching circuit to a PB dial circuit 103 side. Therefore, it is possible to receive service in which the DTMF signal is used such as the reservation or inquiry of a JR reserved ticket, etc., without changing a switch as in an ordinary telephone set of DP system and to prevent a line from being cut off due to the dialing of a dial pulse signal during speech by forgetting the switching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a dial pulse type telephone (hereinafter referred to as a DP type) when a telephone number is to be transmitted, it is automatically switched to the DP type to transmit a dial pulse signal, and after the telephone line is connected. The present invention relates to an automatic DP / PB switching system in which a push button system (called PB system) is automatically switched and a DTMF signal can be transmitted by pressing a dial key.

[0002]

2. Description of the Related Art Conventionally, when transmitting a DTMF signal from a DP type telephone, the DP type is switched to the PB type by a push button switch or a slide switch. Also,
After the call was finished, the above switches and the like were returned to the original state and the PB system was switched to the DP system for the next call.

[0003]

However, in the above-mentioned conventional method, a switch or the like must be used for transmitting the DTMF signal, and after the call is completed, the switch or the like is required for the next transmission. I had to put it back. Also, if you forget these operations and the switch is on the DP side, if you press the dial key during a call, a dial pulse signal will be sent to the office line, and the telephone line that was connected will be disconnected or reverse. Switch is PB
On the side, even if the telephone number is sent, it is a DTMF signal, so N
There was a problem that TT's telephone exchange did not recognize it and could not make a call.

The present invention solves the above-mentioned conventional problems, and automatically sets DP when a telephone line is set by calling a telephone number.
Switching to the system, the number pressed by the dial key is sent to the office line with a dial pulse signal, and after connecting the telephone line,
Automatically switches to the PB system, and the number pressed by the dial key can smoothly receive services such as reservations and inquiries of JR designated tickets as DTMF signals, and disconnection of the telephone line due to erroneous operation or call failure It is an object of the present invention to provide a DP type telephone capable of preventing such a situation.

[0005]

In order to achieve the above object, the present invention comprises means for recognizing that a telephone line is being set by calling a telephone number, and means for automatically switching to the DP system during telephone line setting. The system has means for recognizing that the telephone line is connected and means for automatically switching to the PB system after the telephone line is connected.

[0006]

According to the present invention, with the above construction, when recognizing that the telephone line is being set by calling a telephone number, the system automatically switches to the DP system, and the number pressed by the dial key is sent to the office line by a dial pulse signal, Upon recognizing the line connection, the system automatically switches to the PB system, and the number pressed by the dial key is sent to the office line as a DTMF signal to receive services such as reservation and inquiry of JR designated tickets.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram of a DP type telephone having an automatic DP / PB switching system according to an embodiment of the present invention. Reference numeral 100 is a DP telephone, 101 is a dial key, 102 is a DP transmitting circuit for transmitting a dial pulse signal, 103 is a PB transmitting circuit for transmitting a DTMF signal, 1
04 is DP / for switching between the DP transmission circuit and the PB transmission circuit
A PB switching circuit, 105 is a control circuit for controlling the DP / PB switching circuit, 106 is a hook switch, 107 is a dial tone detecting circuit for detecting a dial tone, 108 is a ring back tone detecting circuit for detecting a ring back tone, and 109 is A call circuit, 110 is an outside line circuit for interfacing with an office line, 111 is a handset, and 120 is NT.
It is a local line from T.

The relationship and operation of each of the above components will be described.
When making a call, when the handset 111 is lifted, the hook switch 106 goes off-hook, and the off-hook information is sent to the control circuit 105. Next, the NTT telephone exchange confirms the off-hook, and when it becomes possible to accept the dial signal, it sends a dial tone signal to the station line. The dial tone signal is sent to the dial tone detection circuit 107 via the outside line circuit 110. When the dial tone detection circuit 107 detects a dial tone signal, the dial tone detection information is sent to the control circuit 105. Based on the off-hook information and the dial tone detection information, the control circuit 105 determines that the telephone line is being set by calling the telephone number, and the DP / PB switching circuit 104 is set to P
A control signal for switching from the B system to the DP system is transmitted.
The DP / PB switching circuit 104 switches from the PB transmitting circuit side to the DP transmitting circuit side by this control signal. After that, when the dial key is pressed, the dial pulse signal corresponding to the dial key number is transmitted to the office line.

Next, when the telephone number has been transmitted, NT
The T telephone exchange sends out a ringback tone signal to its office line. The ringback tone signal is sent to the ringback tone detection circuit 108 via the outside line circuit 110. When the ringback tone detection circuit 108 detects this, the ringback tone detection information is sent to the control circuit 105. Based on this ring back tone information, the control circuit 105 determines that the telephone line is connected, and instructs the DP / PB switching circuit 104 from the DP system to PB.
Send a control signal to switch to the system. The DP / PB switching circuit 104 receives a P signal from the DP transmitting circuit side by this control signal.
Switch to the B transmission circuit side. Thereafter, when the dial key is pressed, the DTMF signal corresponding to the dial key number is transmitted to the office line.

As described above, according to this embodiment, the dial pulse signal is sent to the office line only when the telephone number is sent while the telephone line is being set, and the DTMF signal is sent to the office line after the telephone line is connected. Like

[0011]

As is apparent from the above, the automatic D of the present invention is used.
The DP type telephone equipped with the P / PB switching system is set so that the dial pulse signal can be automatically transmitted during the setting of the telephone line by the telephone number transmission, and the DTMF signal is automatically transmitted after the telephone line is connected. Since it is set to allow outgoing calls, DTMF signals can be sent out without operating the changeover switch of the telephone, and the telephone line is disconnected by dial pulse signal transmission during a call or the PB of the switch.
For example, you cannot make a call when you call a phone number while you are on your side.
It is possible to provide a DP type telephone that can prevent problems due to erroneous operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a DP system telephone having an automatic DP / PB switching system according to an embodiment of the present invention.

[Explanation of symbols]

 100 DP system telephone 101 Dial key 102 DP transmission circuit 103 PB transmission circuit 104 DP / PB switching circuit 105 Control circuit 106 Hook switch 107 Dial tone detection circuit 108 Ring back tone detection circuit 109 Speech circuit 110 Outer circuit 111 Handset 120 Station line

Claims (1)

[Claims] 1. A dial pulse type telephone having means for automatically switching to a dial pulse method when setting up a telephone line by sending a telephone number and means for automatically switching to a push button type after a telephone line is connected. When the line is set, the number pressed by the dial key is sent as a telephone number to the office line by the dial pulse signal, and after connecting the telephone line, the number pressed by the dial key is DTM.
An automatic DP / PB switching system characterized in that it can be sent out to an office line as an F signal.