JPS60250756A - International automatic telephone system - Google Patents

Abstract

PURPOSE:To prevent an originator from excessive load of a telephone rate by connecting a signal converter between a terminal exchange and an international exchange and forming MODEMs in the signal converter and a telephone set terminal. CONSTITUTION:When an originating subscriber of a telephone set terminal 1 requiring international communication hooks off a transmitter/receiver circuit 2, listens a dial tone from the terminal exchange 9 and dials ''a toll number + a subscriber's number'' of the signal converter 13 e.g. from a man/machine interface part 6, a control circuit 5 excites an oscillator 4 having PB frequency and sends the dialing number to the exchange 9. Receiving the terminator's number and the originator's number from the MODEM7, the converter 13 connects these numbers to a trunk circuit 19 through a collected line switch 18 and sends the terminator's number and the originator's number to the international exchange 21 by a MODEM17 in accordance with a normal communication system. After receiving an answering signal from the exchange 21, the international communication will be completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an international Shirabu telephone system that connects subscribers in different countries directly and instantly through dialing by a calling subscriber, and particularly relates to a terminal switchboard of a domestic telephone network and an international switchboard. Regarding the International Shirabe Telephone System, in which signal conversion equipment is installed during the period.

[Prior art]

Conventionally, this type of international Shirabe telephone system requires a special number to be set in order to receive a call from a telephone terminal to the signal conversion device by providing a signal conversion device between the relay exchange of the domestic telephone network and the international exchange. However, there was a drawback that affected the domestic network. Furthermore, since the signal conversion device is connected to a terminal device of the domestic telephone network, it cannot receive the on-hook signal from the calling party of the telephone terminal, and the receiving subscriber in the other country may notice that the conversation has been interrupted. The caller has the disadvantage that expensive international call charges are imposed on the caller until the signal conversion device receives the recovery signal sent when going on-hook.

[Purpose of the invention]

The present invention eliminates the need to set a special number for incoming calls to the signal conversion device by providing the signal conversion device between the terminal exchange of the domestic telephone network and the international exchange. The present invention provides a modem in the caller and sends a disconnection signal from the caller to the signal conversion device, thereby solving the problem of extra international call charges being incurred by the caller.

[Structure of the invention]

The present invention comprises nine telephone terminals housed in a terminal exchange of a domestic telephone network, and a signal conversion device housed in another terminal exchange of the domestic telephone network and connected to an international exchange, from the telephone terminal to the a hindlimb telephone terminal that receives a response signal received by the signal converter using a general subscriber number assigned to the signal converter and transmitted by a modem in the signal converter via a modem in the telephone terminal; The called party number and the calling party number are transmitted from the internal modem, and the called party number and the calling party number are identified via the internal modem of the signal conversion device, and these numbers are converted into the signal according to the signaling method of the international exchange. The device converts the signal and transmits the signal, and the call arrives at the subscriber in the other country via the international exchange, and depending on the subscriber's response, the international call is enabled, and the subscriber of the telephone terminal turns on the call.
At the time of HOOK, first a caller ON signal is transmitted by the modem of the telephone terminal, and after a certain timing, a caller ON signal is sent out according to the normal telephone signal system, and the signal converter transmits the call by the modem via the modem. This is an international 6-quick telephone system that is characterized by sending a disconnection signal to the domestic exchange and international exchange after receiving a caller ON signal in accordance with a normal telephone signal system.

[Explanation of Examples]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. A telephone terminal (1), a transmitting/receiving circuit (2) including a telephone bell circuit included in the telephone terminal (1), a connector circuit (8), and an FB (button) connected to the connector circuit (8). a modem (7) also connected to the connector circuit (8);
7) A ROM(s)t that is connected to and stores the caller number.
, these connector circuits (8) and the PB frequency oscillator (4)
), a modem (?), and a ROM (8), respectively, a control circuit (5), an interface section (6) of the human machine, and a control circuit (5) connected to the telephone terminal (1). A terminal exchange (9), a relay exchange (10, 11) in the domestic telephone network, another terminal exchange (12), a signal converter (18) connected to a nuclear terminal exchange (12), and a signal converter (18) connected to the Switching circuit (14) included in the conversion device (1B)
, a calling signal receiving circuit (16) connected to the switching circuit (14), a trunk circuit (15) connected to the switching circuit (14) and transmitting a response signal, and the trunk circuit (15). A modem (17) connected to the bridge and a central/line switch (18) housing a trunk circuit (15).
), a trunk circuit (19) housed on the output side of the concentrator switch (18) and facing the international exchange (21);
Tora call signal receiving circuit (16), switching circuit (14)
, modem D'y),,) rank circuit (15, 19),
A control device (2) that controls each of the line concentration switches (18)
0) and an international converter (21) to which the signal converter (18) is connected.

Next, the operation of this embodiment will be explained. A calling subscriber from a telephone terminal (1) desiring international communication uses the transmitting/receiving circuit (2)
) off-hook, listen to the dial tone from the terminal exchange (9), and from the man-machine inter-fnis section (6),
For example, when you dial [area code 10 subscriber number] on the signal converter (18), the control circuit (5) activates the FB frequency transmitter (4) and exchanges the above dialed number with the terminal! l! ! Send to (9).

Thereafter, a modem (7) is bridge-connected to the telephone circuit. Thereafter, according to the normal operation of the national telephone network, a paging signal is sent from the terminal exchange (12) to the signal conversion device (18). In the signal conversion device (18), a switching circuit (
14), the call signal is received by the call signal receiving circuit (work 6), and the switching circuit (14) is connected to the trunk circuit (15) under the control of the control device (20) to respond. The signal is sent to the terminal exchange (12) and the modem (
17) to the communication circuit.

The modem (17), under the control of the control device (20), sends out a signal requesting the called number and caller number of the destination country. When the modem (7) in the telephone terminal (1) receives the request signal, it inputs the called party number that has been input in advance from the man-machine interface section (6) and the ROM (8).
) is stored in the control circuit (5).
The signal is sent from the simodem (7) under the control of the simulator.

When the signal converter (18) receives the called party number and calling party number from the modem (7), it switches the concentrator switch (18) to the concentrator switch (18).
8) via the trunk circuit (19) and sends the called party number and calling party number to the international exchange (zl) according to the usual signaling system.

The international call is completed after waiting for a response signal from the international exchange (21).

When the calling subscriber on-hooks the transmitting/receiving circuit (2) to end the international call, the control circuit (5) of the telephone terminal (1)
A disconnection signal is sent from the modem (7) under the control of the modem (7).

Thereafter, an on-hook signal is sent to the terminal exchange (9) at a certain timing according to the normal telephone signal system.

In the signal conversion device (18), when the modem (17) receives the disconnection signal from the modem (7), the control device (20
) is connected to the international exchange (2) via the trunk circuit (19).
1) Sends a disconnection signal. The international line is restored by the disconnection signal.

The domestic network connects the telephone terminal (1) to the terminal exchange (9).
) is recovered by an on-hook signal sent in accordance with normal telephone signaling.

[Effects of the Invention] ” As explained above, the present invention provides a signal conversion device between a terminal exchange and an international exchange, which has the function of receiving various signals and numbers via a modem, and a signal conversion device that has a function of receiving various signals and numbers in a telephone terminal. Providing a modem has the effect of making international calls possible in cases where the normal domestic telephone network does not have sufficient capacity to transmit the calling party number and international terminating subscriber number.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment according to the present invention. 12 telephone terminals, 9: terminal exchange, 12: terminal exchange, 18: signal converter, 21: international exchange. Patent applicant: NEC Corporation Kinsha

Claims (1)

[Claims] It has a telephone terminal housed in a terminal exchange of a domestic telephone network, and a signal conversion device housed in another terminal exchange of the domestic telephone network and connected to an international exchange, and at least transmits information from the telephone terminal to the An international Shirabe telephone system characterized in that a general subscriber number assigned to the signal converter is used to receive a call to the signal converter.