JPH03167952A - Telephone exchange system - Google Patents

Abstract

PURPOSE:To use a communication line of electronic communication enterprises other than a specific company by providing a reply signal generating means to an exchange of a communication line for companies other than the specific company, receiving the reply signal from a called terminal equipment and sending back the reply signal to an adaptor of a caller terminal equipment. CONSTITUTION:When a number of a called terminal equipment 13 is dialed from a caller terminal equipment 1, if the utility charge of a communication line of a company A is cheaper than that of the NTT line, the called terminal equipment 13 replies the call and an exchange 7 of the company A detects the reply signal. Then the reply signal is sent to an adaptor 3 of the caller terminal equipment 1 from a reply signal generator 8 connecting to the exchange 7 of the company A. When the adaptor 3 detects the reply signal, the polarity inversion takes place in a polarity inversion utilizing device 2 and the polarity inversion utilizing device 2 is operated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a telephone exchange system, and particularly to a telephone exchange system that does not have the function of transmitting calling subscriber identification information of Nippon Telegraph and Telephone Company (hereinafter abbreviated as NTT). a (hereinafter referred to as NON-I
from the terminal device connected to the NTT
If you use a communication line of a telecommunications carrier other than N.
The present invention relates to a telephone switching system that generates polarity reversal instead of an ON-ID switch.

[Conventional technology] Recently, telecommunications carriers other than NTT have been encouraged to participate in public communication lines, making it possible to use communication lines at lower charges than NTT's long-distance call charges. When using such a low-cost communication line, it is necessary to provide an adapter to the telephone as a terminal device.

Figure 2 shows three Dentsu companies (hereinafter referred to as
1 is a schematic block diagram showing a telephone exchange system connected to a company (hereinafter referred to as "Company A") and an NTT communication line. Referring to FIG. 2, Q4j, the polarity reversal utilization device 2 is connected to the originating terminal 1. This polarity reversal utilization device 2 responds to a polarity reversal signal from the receiving terminal 13 and starts calculation of charges. The polarity reversal utilization device 2 is connected to an adapter 3, and the adapter 3 is connected to a transit exchange 5 via a NON-ID subscriber exchange 4. The relay exchange 5 is connected to a receiving side relay exchange 11 via an NTT communication line, and the subscriber exchange 12 is further connected to this relay exchange 11. The called terminal 13 is connected to the subscriber exchange 12.

Each of the trunk exchanges 5 and 11 has an interconnection exchange 6.
A>1 exchanges 7 and 9 are connected to these interconnection exchanges 6 and 10, and the A company exchanges 7 and 9 are connected by the A company communication line.

Next, the operation will be explained. When the telephone number of the called terminal 13 is dialed from the calling terminal 1, the adapter 3 selects the company A communication line if the usage fee for the company A communication line is lower than the NTT communication line. And N
The ON-ID subscriber exchange 4 is connected to the A company exchange 7 by automatic dialing via the transfer exchange 5 and the t-th interconnection exchange 6. Next, the dial signal input from the calling terminal 1 is sent out from the adapter 3, and the NON-ID
Subscriber exchange4. Trunk exchange 5, interconnection exchange 6,
Company A exchange 7, Company A communication line, Company A exchange 9, interconnection exchange 10, trunk exchange 11, and subscriber exchange 1
2 to the called terminal 13.

[The problem to be solved by the invention, S] The conventional telephone exchange system is structured as described above, and when the communication line of company A other than NTT is selected, even if the receiving terminal 13 responds, , the NoN-ID subscriber exchange 4 has a structure that does not involve polarity reversal to the originating terminal 1. Therefore, the polarity reversal does not return to the polarity reversal utilization device 2 connected to the originating terminal 1. Therefore, when a polarity reversal utilizing device 2 that utilizes polarity reversal is connected to the calling terminal 1, it is not possible to use a communication line of a telecommunications company other than N/TT. Another drawback is that it is not possible to connect an adapter 3 that selects a communication line from a telecommunications company other than NTT.

Therefore, the main object of the present invention is to enable communication from a calling terminal to which a pole reversal utilization device is connected to the subscriber terminal side of a NON-ID subscriber exchange using a communication line of a telecommunications carrier other than NTT. The objective is to provide a telephone exchange system that can

[Means for Solving the Problems] The present invention connects an originating exchange and a terminating exchange to a communication line of a specified company, and connects a first exchange and a second exchange to a communication line of a business other than the specified company. is connected, the first exchange is connected to the originating exchange, the second exchange is connected to the terminating exchange, and the originating exchange does not have the function of transmitting originating subscriber identification information. A telephone switching system that outputs a response signal from a called terminal device in response to a dialing signal sent from an adapter connected to a local exchange, the telephone switching system being connected to a first exchange. The adapter is configured to output a response signal to the adapter upon receiving a response signal from the receiving terminal device.

[Operation] The telephone switching system according to the present invention includes a response signal generating means in the exchange of a communication line other than a specific company, receives a response signal from a terminal device on the receiving side, and sends the response signal back to the adapter of the terminal on the calling side. This allows the device to operate using this response signal.

[Embodiments of the invention] FIG. 1 is a schematic block diagram of an embodiment of the present invention.

The telephone exchange system shown in FIG. 1 is the same as the embodiment shown in FIG. 2 above, except that the company A exchange 7 is provided with a response signal generator 8. The response signal generator 8 is provided to receive a response signal from the terminal 13 on the receiving side and send the response signal to the terminal 1 on the originating side.

Next, the operation will be explained. When the number of the called terminal 13 is dialed from the calling terminal 1, if the l-11 fee for Company A's communication line is lower than the NTT line, the called terminal 13 responds and This response signal is detected. Then, a response signal is sent from the response signal generator 8 connected to the company A exchange 7 to the adapter 3 of the calling terminal 1. When the adapter 3 detects the response signal, it generates a polarity reversal in the polarity reversal utilization device 2, and the polarity reversal utilization device 2 operates based on this polarity reversal.

In the embodiment shown in FIG. 1, the transmitting terminal 1 and the polarity reversal utilization device 2 are connected, or the transmitting terminal 1 is provided with a function utilizing polarity reversal. Even if there is such a case, the present invention can be applied.

[Effects of the Invention] As described above, according to the present invention, even if a polarity reversal device is connected to the terminal side of a subscriber exchange that does not have the function of transmitting subscriber identification information, It is possible to use the communications company's communication line, and the adapter can be installed without worrying about the operation of the polarity reversal device.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an embodiment of the present invention. FIG. 2 is a schematic block diagram of a conventional telephone switching system. In the figure, 1 is the originating terminal, 2 is the polarity reversal utilization device, and 3
is an adapter, 4 is a NON-ID subscriber switch, 5, 11
is a relay exchange, 6 and 10 are t-th interconnection exchanges, 7 and 9
8 indicates a company A exchange, 8 a response signal generator, and 13 a terminal on the receiving side.

Claims (1)

[Scope of Claims] An originating exchange and a terminating exchange are connected to a communication line of a specific company, and a first exchange is connected to a communication line of a business other than the specific company.
and a second exchange are connected, the first exchange is connected to the originating exchange, and the second exchange is connected to the originating exchange.
an exchange is connected to the terminating exchange, a local exchange without a function of transmitting calling subscriber identification information is connected to the originating exchange, and a dial signal is sent from an adapter connected to the local exchange. In a telephone switching system that outputs a response signal from a called terminal device in response to the sending of a response signal, the telephone switching system is connected to the first exchange, receives a response signal from the called terminal device, and outputs a response signal to the adapter. A telephone exchange system equipped with a response signal generation means for outputting a response signal.