JPH04358440A - Digital circuit terminal equipment and its operating method - Google Patents

Abstract

PURPOSE:To attain the immediate transmission of message even though the operator of a terminal equipment of the distant side is kept in a busy mode and uncommunicative. CONSTITUTION:The telephone number of its own and a prescribed message are previously in a memory. If it is known that the operator of a terminal equipment 20D of the distant side is busy and uncommunicative through a B channel circuit exchange mode, the message, etc., stored previously are immediately transmitted through a D channel packet exchange mode. When the operator of the equipment 20D reads the message and the talking is complete, the talking is possible with the operator of a terminal equipment 20A.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is applicable to ISDN (Integ
rated Services Digital Ne
The present invention relates to a terminal device connected to a digital line network such as twork) and its operating method.

0002

2. Description of the Related Art ISDN has become popular in recent years. ISD
N has features such as high-quality communication that is resistant to noise and crosstalk, strong compatibility with computers, and easy communication processing, so it is suitable for communication not only of voice but also of various data including image data. It can be used for

0003

[Problems to be Solved by the Invention] When communicating with an operator of another ISDN terminal using an ISDN terminal, the operator of the other ISDN terminal may be in the middle of a conversation. In such a case, the operator who wants to make a call must make a new call to the ISDN terminal, which is troublesome. Furthermore, if there is an urgent need to make a call, it is not possible to contact the other party immediately, which is very inconvenient.

SUMMARY OF THE INVENTION An object of the present invention is to enable the operator of the terminal device of the other party to immediately send a message even while the other party is on the phone.

[0005]

[Means for Solving the Problems] A digital line terminal device according to the present invention includes a first calling means for calling a terminal device for connection through a digital circuit switched communication channel;
means for determining that the digital circuit switched communication channel of the terminal device is in use and cannot be connected to the terminal device through the digital circuit switched communication channel; a second calling means for calling the terminal device in order to connect through a digital packet switching channel when connection is not possible, a storage means for storing in advance a message to be sent to the terminal device, and the second calling device. The present invention is characterized by comprising means for transmitting a message stored in the storage means to the terminal device through the digital packet switching channel in response to a response from the terminal device obtained by the means.

[0006] In the operating method of a digital line terminal device according to the present invention, a call is made to the terminal device for connection through a digital circuit switched communication channel, and when the digital circuit switched channel of the terminal device is in use, Checks whether or not it is not possible to connect to the terminal device through the digital circuit switched communication channel, and when it is not possible to connect to the terminal device through the digital circuit switched channel, calls the terminal device in order to connect through the digital packet switched channel. characterized in that a message to be transmitted to the terminal device is stored in advance, and the message stored in advance in the terminal device is transmitted through the digital packet switching channel in response to a response from the terminal device. do.

[0007]

According to the present invention, in order to communicate with the operator of the terminal device, a call is made to the other party's terminal device through the digital circuit switched communication channel. If the operator of the other party's terminal device is busy on the phone and connection cannot be made through the digital circuit switching channel, the connection is made to the other party's terminal device through the digital packet switching channel. When connected to the other party's terminal device through a digital packet-switched communication channel,
A pre-stored message is sent to the other party's terminal device.

[0008]

[Embodiment] FIG. 1 shows a one-line IS according to an embodiment of the present invention.
This shows a DN network.

In the ISDN network shown in FIG. 1, a plurality of ISDN terminal devices 20A are connected to the ISDN line network 40.
~20F are connected.

In a single-line ISDN network, a B1 channel, a B2 channel, and one D channel are connected to an ISDN line network 40. B1 channel and B2 channel are channels that can transfer data using circuit switching method and packet switching method.
The channel is a channel that allows data transfer only using the packet switching method.

FIG. 2 is a block diagram showing the electrical configuration of an ISDN terminal device. Although FIG. 2 shows the ISDN terminal device 20A, the other ISDN terminal devices 20B to 20F have a similar configuration.

The entire operation of the terminal device 20A is controlled by the CPU 10.

The terminal device 20A includes a program control memory 1 that stores the operating program of the CPU 10, a number message transmission memory 2 that stores the telephone number and messages of the terminal device 20A, and a telephone number that is transmitted from other terminal devices. and a number message storage memory 3 for storing messages; a codec section (encoding/decoding section) 11 for converting analog audio signals into digital audio data and converting digital audio data into analog audio signals;
, a line control unit 12 for communicating with other terminal devices through the ISDN line network 40, and a keyboard 1 including push buttons for manually calling other terminal devices.
3. A display section 15 for displaying messages, etc., an amplifier 16, a speaker 17 for outputting audio, and an I/O for controlling signals input by operating the keyboard 13, display on the display section 15, and audio output from the speaker 17; An O control section 19 is provided.

The functions of the line control section 12 and the I/O control section 19 can be realized by a hardware circuit or by the CPU 10. Each part may be realized by a separate CPU.

FIG. 3 shows the communication sequence of the terminal device.

In FIG. 1, the hatching shown in the B1 channel and the B2 channel indicates a state where a call is in progress. In FIG. 1, the operator of the terminal device 20D uses the B1 channel to talk to the operator of the terminal device 20C, and
The operator of E is in a state of talking with the operator of terminal device 20B using the B2 channel.

In this case, the operator of the terminal device 20A may try to talk to the operator of the terminal device 20D.

The operator of the terminal device 20A uses the keyboard 13
By specifying the telephone number of the terminal device 20D using
Call settings are made. The line on the terminal device 20D side is
Since the terminal devices 20D and 20E are each using the B channel for communication, they cannot respond to the call made by the terminal device 20A. For this reason, the ISDN line network 40 provides the terminal device 20A with a signal indicating that the terminal device 20A is released and a signal indicating the reason why the terminal device 20D cannot make a call.

When the terminal device 20A recognizes that the call processing to the terminal device 20D cannot be performed, the terminal device 20A performs communication processing using the D channel packet exchange mode.

[0020] The line control unit 12 makes a call to the terminal device 20D using the D channel. When a signal indicating an outgoing call arrives at the terminal device 20D, a signal indicating that the incoming call has been accepted is outputted from the terminal device 20D. ISDN line network 40
A signal indicating that the connection with the terminal device 20D is completed is given to the terminal device 20A.

[0021] When the terminal device 20A recognizes that it is connected to the terminal device 20D, the data stored in advance in the number message sending memory 2 (for example, your own telephone number and a message indicating that you would like to be contacted) is sent to the terminal device 20A. These messages and the like are read out and given an ID code to the terminal device 20D through the ISDN network 40.

Messages and the like transmitted from the terminal device 20A are given to a number message storage memory included in the terminal device 20D and are temporarily stored. The message once stored in the storage memory is read out and given to the display section by the I/O control section so that the transmitted message is visually displayed. This allows the operator of the terminal device 20D to recognize that a message has been received during a call by the operator.

When a message or the like is stored in the storage memory, a signal indicating confirmation thereof is outputted from the line control section 12 and given to the terminal device 20A through the ISDN line network 40.

When the terminal device 20A confirms that the message has been stored in the terminal device 20D, the D channel is disconnected. A signal indicating confirmation of disconnection of the D channel is output from the terminal device 20D and transmitted to the ISDN network 4.
0 to the terminal device 20A.

[0025] As described above, from the terminal device 20A to the terminal device 2
The message transmission process using the D channel to 0D ends.

When the call by the operator of the terminal device 20D ends, by visually checking the message displayed on the display unit 15, the terminal device 20A can make a call to talk to the operator of the terminal device 20A. Processing is performed. When the response from the terminal device 20A is received through the ISDN network 40, a response confirmation signal is given from the terminal device 20D to the terminal device 20A. As a result, the terminal device 20
Direct communication between A and 20D becomes possible.

[0027]

[Effects of the Invention] According to the present invention, when attempting to talk to the operator of the other party's terminal device, if the operator of the other party's terminal device is busy and connection cannot be established through the digital circuit switched communication channel, It is immediately connected to the other party's terminal device through a digital packet-switched channel. When connected to a partner terminal device through a digital packet switching channel, a pre-stored message is sent to the partner terminal device.

Even if the operator of the other party's terminal device is talking with the operator of another terminal device, a message can be immediately sent to the other party's terminal device. By including the telephone number of one's own terminal device and the intention to contact the user in the message, there is no need to make multiple calls.

Since message transmission uses a digital packet-switched communication channel, unlike communication using a digital circuit-switched channel, there is no connection failure with the terminal device, and data can be sent to the other party's terminal device by interrupting the message data. becomes possible. Therefore, even in the case of an emergency, it is possible to reliably send a message to the other party immediately.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of an ISDN network.

FIG. 2 is a block diagram of an ISDN terminal device according to an embodiment of the invention.

FIG. 3 shows a communication sequence.

[Explanation of symbols]

1 Program control memory 2 Memory for sending number messages 3 Memory for number message storage 10 CPU 12 Line control section 20A-20F ISDN terminal equipment

Claims (2)

[Claims] 1. A first calling means for calling a terminal device for connection through a digital circuit switched channel, wherein the digital circuit switched channel of the terminal device is in use; means for determining that the terminal device cannot be connected to the terminal device through the digital packet switching communication channel when the determining means cannot connect to the terminal device through the digital circuit switching channel; Second
the terminal device through the digital packet switching communication path in response to a response from the terminal device obtained by the calling means, the storage means for storing in advance a message to be sent to the terminal device, and the second calling means. and means for transmitting the message stored in the storage means. Claim 2: A call is made to a terminal device for connection through a digital circuit switched communication channel, and the digital circuit switched channel of the terminal device is in use, and the terminal device is connected to the terminal device through the digital circuit switched channel. If it is not possible to connect to the terminal device through the digital circuit switching channel, call the terminal device and send a message to the terminal device in advance to establish a connection via the digital packet switching channel. storing the message, and transmitting the pre-stored message to the terminal device through the digital packet switching channel in response to a response from the terminal device;
How to operate a digital line terminal device.