JPH10190831A - Ordering telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a subscriber to make a speech to each of a plurality of the orderingtelephone sets in an ordering telephone system that has the plurality of the ordering telephone sets connected each other to an order wire. SOLUTION: An exchange interface of a terminal station ordering telephone set 122, in response to a call originating from a subscriber 117, detects an on- state of a line SR to make a line SS an on-state and to reply to an exchange 118. Thus, a speech path with relay station ordering telephone sets 123, 124 is established via the ordering telephone set 122 and an order wire 125 from the subscriber 117 and the exchange 118. A terminal station ordering telephone set 112 discriminates whether in response to a station number PB from the subscriber 117 the terminal station ordering telephone set 112 is its own station or another station and permits a speech between its own station and the subscriber 117, when being its own station and sends the station number to the relay station ordering telephone sets 123, 124 via the order wire 125, when being the other station, to establish a speech path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a meeting telephone system and, more particularly, to a meeting telephone system which is a built-in order wire communication system built in a remote monitoring control device and a remote monitoring control device for making a meeting between these devices. It is about.

[0002]

2. Description of the Related Art A meeting telephone in an order wire communication system is generally incorporated in a remote monitoring control device or a remote monitoring control device, and is used between a terminal station and a relay station in equipment maintenance of a multiplex radio communication network. It is used as a necessary means of communication.

A meeting telephone of this type uses a service channel of a multiplex radio communication network as a transmission line, and calls a partner station by a speaker calling method using voice and a DTMF.
(Dial Tone Multi-Frequency) There is a calling system using a signal, and its use range is within a multiplex wireless communication network.

As an example of an order wire communication system using a meeting telephone, there is a technique disclosed in Japanese Patent Application Laid-Open No. Hei 2-20163, and FIGS. FIG. 3 is an overall communication system block diagram.
FIG. 4 is a diagram showing a specific example of the terminal order wire device 18 connected to the exchange 17 of FIG.

Referring to FIG. 3, a terminal device 14 and relay devices 15 and 16 are connected via a transmission line. These devices 14 to 16 are connected to order wire devices 18 to 20 respectively.
Are attached via respective wires of 4WR (4 wire receive) and 4WS (4 wire send). The order wire device 18 of the terminal device 14 is connected to the exchange 17. 21 is a subscriber line.

[0006] As shown in FIG. 4, the order wire device 18 of the terminal station has a four-wire input terminal 1 and a four-wire output terminal 2.
A DTMF receiver 3, a station number identification circuit 4 for identifying the exchange connection station number sent from the partner station, and a station number identification circuit 5 for identifying the own station number sent from the partner station. , A telephone base 6, a headset (or handset) 7, a keypad 8, a DTMF generator 9, a switching circuit 10, a 4-wire / 2-wire conversion circuit 11, an exchange interface 12, and an exchange connection terminal 13. And

Next, the operation will be described. A call signal from the order wire device of the partner station is input from a terminal 1 to a DTMF receiver 3. DTMF receiver 3 is DTMF
The signal is discriminated, and the result is sent to the station number identification circuits 4 and 5.

If the call number from the partner station is this order wire device, it is identified by the station number identification circuit 5,
A control signal is sent to the communication base 6 and the switching circuit 10 to establish a communication path. Then, an input signal from the terminal 1 passes through the communication base 6 and is output from the headset 7. The input signal from the headset 7 passes through the communication base 6 and the switching circuit 10, and is supplied with a 4-wire / wireless signal according to a control signal from the station number identification circuit 5.
The signal is output to the terminal 2 via the two-wire conversion circuit 11.

Next, when the call number from the partner station is the designated number of the exchange, it is identified by the office number identification circuit 4 and sends a control signal to the communication base 6, the switching circuit 10 and the exchange interface 12.

The subsequently transmitted subscriber line number is output to the exchange connection terminal 13 by the exchange interface 12 in response to a control signal from the station number identification circuit 4. As a result, a communication path is established.

An input signal from a terminal 1 passes through a 4-wire / 2-wire conversion circuit 11 and, in accordance with a control signal from a station number identification circuit 4, passes through a switching circuit 10 to an exchange interface 1.
2. Output to terminal 13. An input signal from the terminal 13 is output to the terminal 2 via the exchange interface 12, the switching circuit 10, and the 4-wire / 2-wire conversion circuit 11.

If the call number from the other party is neither the own station number nor the exchange number, the call is ignored by the station number identification circuits 4 and 5.

When calling the order wire device of the partner station from the own station, a control signal is sent from the talk base 6 to the switching circuit 10 by inputting a number to the talk base 6 from the keypad 8. A DTMF signal corresponding to the number pressed by the keypad 8 is generated by a DTMF generator 9,
The signal is output to the terminal 2 through the switching circuit 10 and the 4-wire / 2-wire conversion circuit 11.

When a subscriber's line is called from the own station via the exchange, the keypad 8 is connected to the switching circuit 2 via the communication base 6.
0, a control signal is sent to the exchange interface 12.
The DTMF signal is output from the exchange interface 12 to the terminal 13 in response to a control signal from the communication base 6.

Therefore, a call between the order wire devices is performed by designating the station number of the partner device. Exchange 17
A call with a subscriber line connected to is performed by designating the station number on the exchange side of the order wire device 18 and further designating the subscriber line number.

[0016]

The conventional methods shown in FIGS. 3 and 4 have the following two problems in the construction of a meeting telephone system. The first problem is that when a subscriber line is called from the partner station and the own station via the exchange, the order wire apparatus does not have a termination function (on-hook function) for the exchange, so that the line remains in a seized state. , Can not be recovered. Normally, the exchange cannot release the telephone line unless it receives an end signal from the calling side. A second problem is that it is not possible to establish a communication path with the order wire device via the exchange by transmitting a signal from the subscriber line.

An object of the present invention is to provide a meeting telephone capable of establishing a communication path with an order wire by calling from a subscriber line.

It is another object of the present invention to provide a meeting telephone capable of releasing (restoring) a line by adding a termination function to an exchange.

[0019]

According to the present invention, there is provided a plurality of meeting telephones connected to each other via a meeting line, and among the plurality of meeting telephones, a terminal office meeting telephone which is a terminal is an exchange. And a telephone line connected to the public line via the public telephone line, and a telephone call is made between these conference telephones and between the subscribers via the exchange. An interface means for establishing a communication path between the exchange and the own apparatus via the interface means in response to a call transmission from the subscriber to the meeting telephone; and In response to the incoming of the office number of the meeting telephone indicating the communication destination transmitted via the communication path, the office number is identified and the office number other than the own machine is identified. Sometimes the meetings telephone system, characterized in that the station number by performing connection control between the host machine and the meetings line and a control means for sending control to the meetings line is obtained.

The control means has station number identification means for identifying the station number, and determines whether the station number is a number indicating its own device or a number indicating another device. The control means includes end signal detection means for detecting an end signal from the exchange due to the on-hook of the subscriber and releasing the communication path in response to detection of the end signal. And

Further, the control means may determine whether the calling number from the other apparatus is a station number for connecting to the exchange by the station number identifying means, or when the own apparatus calls the subscriber. A communication path is established between the exchange and its own device via the interface means.

Further, the control means establishes a communication path between the other device and the own device when the own device is called from another device and when the own device calls the other device. Wherein the control means performs means for generating an end signal and, in response to the generation of the end signal, release control of a communication path between the other device and the own device. And means for making.

The operation of the present invention will be described. When calling from a subscriber line via a branch exchange to a relay station meeting telephone to make a call, the telephone number for the meeting telephone line trunk of the terminal office exchange is entered from the subscriber line telephone, so that the subscriber line and the A communication path is established with the meeting telephone line via the terminal office meeting telephone. Subsequently, by inputting the station number for the target relay station meeting telephone from the subscriber line telephone, the number is sent to the relay station meeting telephone, and the DTMF receiver recognizes the local number as the own station number. A communication path is formed between them, and a call can be made.

Also, when the end office meeting telephone is provided with an end number identification circuit and calls a subscriber line from the relay office meeting telephone via the exchange of the end office to make a call, the keypad of the relay office meeting telephone at the end of the call. By inputting the end number from the terminal, the end number is detected by the end number identification circuit of the terminal's meeting telephone, and the SS line to the exchange is turned off.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system block diagram to which the embodiment of the present invention is applied. In FIG. 1, the remote monitoring control device 119 and the remote monitoring control devices 120 and 121 have meeting telephones 122 to 124, respectively, which are connected to a meeting telephone line 125 which is an order wire. I have. This order wire 12
Reference numeral 5 denotes a service channel of a multiplex radio line.

A meeting telephone 122 serving as a terminal station (the other meeting telephones are relay stations) is connected to the exchange 118, and is connected to the subscriber's telephone 11 via a public line network 126.
7 is connected.

FIG. 2 is a block diagram showing a specific example of the terminal meeting telephone 122 in the block of FIG. The telephone 122 of this embodiment has a DTMF receiver circuit 103.
, Station number identification circuits 104 and 105,
, Handset 107, keypad 108, DT
MF generator circuit 109 and end number identification circuit 11
0, a hybrid circuit 111, and an exchange interface 112.

The relay station meeting telephones 123, 124
Has basically the same configuration as the terminal meeting telephone 122 (FIG. 2), but has no connection with the exchange 118.
It is assumed that the switch interface 112 and the circuit 104 for controlling the switch interface 112 are not provided.

In this embodiment, when an outgoing call is made from the relay station meeting telephone 123 to the subscriber line telephone 117, the exchange interface 112 of the terminal office meeting telephone 122 is operated by the keypad 108 of the meeting telephone 123.
Enter the station number by key. The key-input station number is converted into a DTMF signal by a DTMF generator circuit 109, passed through a hybrid circuit 111 and a four-wire output terminal 102, and via a meeting telephone line 125 via a four-wire input terminal of a terminal office meeting telephone 122. 101, and is input to the DTMF receiver circuit 103 through the hybrid circuit 111.

After the station number converted into a DTMF signal by the DTMF receiver circuit 103 is restored to a digital signal,
Station number identification circuits 104 and 105, end number identification circuit 1
10, respectively. The station number identification circuit 104 decodes the station number, determines that the station number is the own station number, and sends a call start to the exchange interface 112.
13 is turned on. When detecting that the SS line 113 is turned on, the exchange 118 sends a DT reception tone to the 4WR line 115.

After confirming the DT reception tone at the meeting telephone 123, the telephone number of the subscriber's line telephone 117, which is the destination of the call, is key-inputted from the keypad 108. After that, the call is sent from the exchange 118 to the public line network through the terminal meeting telephone 122 via the meeting telephone line 125, and the subscriber telephone 117 is called. By hooking up the subscriber line telephone set 117, the SR line 115 of the exchange 118 is turned on, a communication path is established, and a telephone call is possible.

In order to end the call, the end number is converted into an MF signal in the same manner as the office number by inputting the end number from the keypad 108 of the relay station meeting telephone 123. Is sent to the hybrid circuit 111 through the 4-wire input terminal 101 of the terminal meeting telephone 122 to enter the DTMF receiver circuit 103.

After being converted into a digital signal by the DTMF receiver circuit 103, the end numbers are sent to station number identification circuits 104 and 105 and an end number identification circuit 110, respectively.
The end number identification circuit 110 decodes the call, determines that the call has ended, and sends an end signal to the exchange interface 112. The exchange interface 112 turns off the SS line 113 when the call ends. Exchange 118 is SS line 11
3 and turns off the SR line 115,
On-hook processing for public line (DC loop release)
And the call ends.

Next, when an outgoing call is made from the relay station meeting telephone 123 to the terminal office meeting telephone 122, the station number of the terminal office meeting telephone 122 is key-input on the keypad 108 of the meeting station 123. The station number entered by key is input to the DTMF generator circuit 109.
Is converted into a DTMF signal by the hybrid circuit 111,
It enters the 4-wire input terminal 101 of the terminal conference telephone 122 via the 4-wire output terminal 102 and the conference telephone line 125, and passes through the hybrid circuit 111 to the DTM.
The signal is input to the F receiver circuit 103.

The station number converted into a DTMF signal by the DTMF receiver circuit 103 is restored to a digital signal, and then input to the station number identification circuits 104 and 105 and the end number identification circuit 110, respectively. In the station number identification circuit 105,
The station number is decoded and determined as the own station number, and a call start is transmitted to the call base 106, so that the call base 106 is called, and an outgoing call from the relay telephone 123 to the terminal telephone 122 is made. It becomes possible.

In order to end the call, the end number is input by keypad from the keypad 108 of the relay station meeting telephone 123.
After being converted to the F signal, the input terminal 101 of the terminal office telephone 122 is connected via the office telephone line 125.
To the hybrid circuit 111 to enter the DTMF receiver circuit 103.

After being converted into a digital signal by the DTMF receiver circuit 103, the end number is changed to the station number identification circuit 104.
, 105 and an end number identification circuit 110. The end number identification circuit 110 decodes the data, determines that the communication is over, and sends an end signal to the communication base 106. In the call base 106, the ringing tone when the terminal meeting telephone 122 does not answer due to the end of the call is stopped.

When an outgoing call is made from the subscriber's line telephone 117 to the relay office meeting telephone 123, the subscriber's office telephone 117 sends the terminal office meeting telephone 1 of the terminal exchange 118.
When the telephone number of the trunk for P.22 is input by PB, the terminal exchange 118 switches the SR
The line 116 is turned on. When the exchange interface 112 of the terminal meeting telephone 122 detects that the SR line 116 is on, it turns on the SS line 113 to return a response to the terminal exchange 118.

Thus, the relay station meeting telephone 1 passes from the subscriber line telephone 117 and the terminal exchange 118 through the terminal meeting telephone 122 and the meeting telephone line 125.
A communication path with 23 and 124 is established.

By inputting the station number of the relay station meeting telephone 123 from the subscriber line telephone 117 via PB, the station numbers are received by the relay station meeting telephones 123 and 124, respectively, and the station number identification of the relay station meeting telephone 123 is performed. The circuit 105 determines the own station number, and makes a call to the calling base 106 for the calling meeting telephone 123.

To end the call, the subscriber line telephone 117
The terminal exchange 118 receives an end signal (polarity reversal, etc.) from the public line network and turns off the SR line 116 for the terminal meeting telephone 122.
Upon detecting that the SR line 116 has been turned off, the terminal office meeting telephone 122 turns off the SS line 113, disconnects the communication path with the terminal exchange 118, and ends the telephone conversation.

In the present embodiment, the detailed operation of the outgoing / incoming call between the relay station meeting telephone and the subscriber line telephone has been described, but the outgoing / incoming call between the relay station meeting telephone and the terminal extension telephone is also described. It is similar to this.

As described above, not only between each relay station and between the terminal station and the relay station, but also each call from the relay station to the subscriber and from the subscriber line to the relay station requires preparing a mobile phone or a special dedicated line. And the cost can be reduced.

[0045]

As described above, according to the present invention, it is possible to call a meeting telephone of each station from a subscriber and make a call. Therefore, it is necessary to prepare a dedicated line such as a special portable telephone for the call. Therefore, there is an effect that the cost can be reduced.

Further, at the end of a call between a terminal station and a relay station or between a terminal station and a subscriber, an input of an end number by a key can release the captured line. is there.

[Brief description of the drawings]

FIG. 1 is a system block diagram to which an embodiment of the present invention is applied.

FIG. 2 is a block diagram of an embodiment of the present invention.

FIG. 3 is a system block diagram for explaining a conventional technique.

FIG. 4 is a block diagram showing a specific example of the order wire device 18 of FIG.

[Explanation of symbols]

 103 DTMF receiver circuit 104, 105 Station number identification circuit 106 Communication base 107 Handset 108 Keypad 109 DTMF generator circuit 110 Termination number identification circuit 111 Hybrid circuit 112 Exchange interface 117 Subscriber line telephone 118 Exchange 119 Remote monitoring control device 120, 121 Remote monitoring control device 122 to 124 Meeting telephone 125 Meeting telephone line 126 Public line network

Claims (6)

[Claims] 1. A plurality of meeting telephones connected to each other via a meeting line, wherein one of the plurality of meeting telephones, which is a terminal, is connected to a public network via an exchange. A meeting telephone system for making a call between equal meeting telephones and with a subscriber via the exchange, wherein the terminal office meeting telephone comprises an interface means for interfacing with the exchange, and Means for establishing a communication path between the exchange and the own apparatus via the interface means in response to a call transmission from the user to the meeting telephone, and communication transmitted from the subscriber via the communication path This office number is identified in response to the incoming of the office number of the meeting telephone indicating the other party. And a control means for controlling connection between the telephone number and the office number and sending out the station number to the meeting line. 2. The apparatus according to claim 1, wherein said control means has a station number identifying means for identifying said station number, and determines whether said station number is a number indicating its own device or a number indicating another device. 2. The meeting telephone system according to claim 1, 3. The control means includes end signal detection means for detecting an end signal from the exchange due to the on-hook of the subscriber and releasing the communication path in response to the detection of the end signal. The meeting telephone system according to claim 1 or 2, wherein: 4. The control means determines whether a call number from another apparatus is a station number for connection to an exchange by the station number identification means or a case in which the own apparatus calls the subscriber. The meeting telephone system according to any one of claims 1 to 3, wherein a communication path between the exchange and the own device is established via the interface means. 5. The control means establishes a communication path between the other device and the own device when the own device is called from another device and when the own device calls the other device. The meeting telephone system according to any one of claims 1 to 4, wherein: 6. The control means includes means for generating an end signal, and means for controlling release of a communication path between the other device and the own device in response to generation of the end signal. The meeting telephone system according to claim 5, wherein: