JPH03274849A - Isdn communication system - Google Patents

Abstract

PURPOSE:To enable the communication of audio data to be performed in step of call connection and an audio message to be sent even without performing off-hook at a reception side ISDN terminal by performing the communication by inputting the audio data in a user/user information element in the step of call connection. CONSTITUTION:A transmission side ISDN terminal 1 receives a response message CONN after sending out a call setting message SETUP when issuing a call and performing a prescribed procedure, however, when a transmission key 4a is depressed until receiving the response message CONN, the transmission side ISDN terminal 1 transmits the audio data inputted from a handset 8 as the data of the user/user information element of the call setting message SET UP, and returns an operation to an ordinary transmission control procedure. The reception side ISDN terminal 1, when receiving the user/user information element, takes out the audio data from the user/user information element, and stores it in memory 3. As a result, it is possible to send the message to an opponent in voice even without performing the off-hook by the reception side ISDN terminal.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to ISDN communication systems, and in particular, to transmission and reception of voice between ISDN terminals using user-to-user information communicated in call control procedures. The present invention relates to an ISDN communication system that enables

[Conventional technology]

Recently, ISDN (Integrated Service Digital Network) has been implemented on a trial basis as a communication network that meets the communication needs of realizing a highly information-oriented society.
SDN terminals have also been developed and put into practical use. For example, I
There are facsimile devices compatible with SDN that comply with the G4 standard, and facsimile storage and forwarding devices have also been put into practical use.

These ISDN terminals each have an I
Connected to SDN, 1sDN basic interface (2
B+D channel) and communication control procedures in ISDN are executed.

A call control procedure is executed on the D channel of this basic interface, and a data transmission control procedure is executed on the B channel. Conventionally, in communication between ISDN terminals, when transmitting and receiving voice data, a call is set up using the D channel, and then the B channel of the ISDN basic interface is used to transmit and receive data such as voice. ,D
The B channel is controlled using the channel.

[Problem to be solved by the invention]

However, in such conventional ISDN communication systems, voice data is sent and received using the B channel of the basic interface, so it is difficult to send and receive voice data.
Reception can only be performed after a call is set up between the transmitting ISDN terminal and the receiving ISDN terminal in the D channel call control procedure, which poses the problem of poor usability of the ISDN terminal. Ta.

[Purpose of the invention]

Therefore, the present invention makes it possible to transmit and receive voice data at the call connection stage by adding voice data to the D channel user information and communicating, thereby preventing off-hook at the receiving ISDN terminal. The aim is to improve the usability of ISDN terminals, such as by allowing voice messages to be sent even when using an ISDN terminal.

[Structure of the invention]

In order to achieve the above object, the present invention provides a system in which a transmitting side ISDN terminal and a receiving side ISDN terminal are respectively connected to the ISDN via a network termination device, and the transmitting side ISDN terminal is connected to the ISDN via a network termination device.
In an ISDN communication method in which communication is performed by executing ISDN communication call control procedures between a DN terminal and the receiving ISDN terminal, voice data is sent to the ISDN terminal to add voice data to the user/user information of the call connection control procedure. The present invention is characterized in that it includes: an adding means, and a voice data extracting means for extracting voice data from the user/user information, thereby making it possible to transmit and receive voice data at the call connection stage.

Hereinafter, the present invention will be specifically explained based on examples.

1 to 6 are diagrams showing an embodiment of the ISDN communication system of the present invention.

FIG. 1 is a block diagram of an ISDN terminal used in the ISDN communication method, and the ISDN terminal 1 includes a system control section 2, a memory 3, an operation display section 4. ISDN interface 5, LAPD (LinkAccess
Procedure on the D-channel
1: D channel link access procedure) It includes a control section 6, an audio signal conversion section 7, a handset 8, a tone generation section 9, a speaker 10, and the like. Each part of the ISDN terminal is connected by a path 11, and the ISDN terminal 1 is connected to an ISDN network terminal (NT) not shown.

The system control unit 2 controls each part of the ISDN terminal 1,
It executes the sequence as the ISDN terminal 1, and also executes the audio transmission/reception processing of the present invention.

The memory 3 stores the basic program of the ISDN terminal, the voice transmission/reception processing program of the present invention, etc., as well as various data necessary for the control of the ISDN terminal, in particular, as described later, the program of the present invention. Users, user information elements, etc. necessary for voice transmission/reception processing are stored.

The operation display section 4 is configured as shown in FIG. 2, and is provided with a transmission key 4a, a % numeric keypad 4b, a handset 8, and a speaker 10. The transmission key 43 is a key for transmitting audio data on the D channel, and the numeric keypad 4b is used to input the destination telephone number, subaddress number, etc. Further, when the handset 8 is used for a call with a partner terminal, and the handset 8 is placed on the operation display section 4, an on-hook state is detected by a hook switch (not shown), and when the handset 8 is picked up, the hook switch is activated. , the off-hook state is detected. This hook switch detection result is output to the system control section 2.

ISDN interface 5 connects ISDN terminal 1 to ISDN
The LAPD control unit 6 executes line control processing of the ISDN basic interface function.

The audio signal converter 7 converts and compresses the audio signal input by the handset 8 into a digital signal that can be handled by ISDN, and also converts the audio signal sent from the ISDN into an analog audio signal to be transmitted to the handset 8 or speaker. 10
”?This is output.

The handset 8 has a speaker and a microphone, and is used for making calls.

The tone generating section 9 operates under the control of the system control section 2, and generates a ring tone to call the operator when an incoming call is detected, a beep tone to alert the operator, etc.
Generates various tone signals. The tone signal generated by the tone generator 9 is amplified and outputted by the speaker 10.

Next, the effect will be explained.

The present embodiment is characterized in that voice transmission and reception can be performed using user-to-user information in the ISDN communication call control procedure.

This audio transmission/reception process will be explained below.

Note that in this embodiment, the first .
It is assumed that the ISDN terminal 1 shown in FIG. 2 is installed.

First, the normal ISDN communication method will be explained.

Generally, when making a call, the transmitting ISDN terminal 1 sends a call setup message 5E via its D channel, as shown in FIG.
A TUP is sent to the ISDN to request call setup with the receiving ISDN terminal 1. ISDN is the specified receiving ISD
A call setup message 5ETUP is sent to the N terminal 1 to make a call, and a call setup reception message CALL PROC (Call PROC) is sent to the N terminal 1 to make a call.
eding) to the transmitting ISDN terminal 1. On the other hand, when the receiving ISDN terminal 1 detects an incoming call, it starts sounding a ring tone to call the operator and sends a paging message ALERT to the ISDN. When the ISDN receives this alert message ALERT, it sends the alert message ALERT to the sending side ISDN.
N terminal 1 to notify that the receiving ISDN terminal 1 has started calling. In addition, the call message ALERT
is output repeatedly at appropriate intervals. Here, the receiving side I
When the SDN terminal 1 detects that the operator who heard the ringing tone has taken the handset 8 off-hook, it sends a calling message C0NN to the ISDN. The ISDN sends a response message C0NN to the sending ISDN terminal 1 to notify that the receiving ISDN terminal 1 has accepted the call, and also sends a response confirmation message C0NN ACK to the receiving ISDN terminal 1. , check the response from the receiving ISDN terminal, and confirm the response from the receiving ISDN terminal 1. At this point, the sending ISDN terminal 1 and the receiving ISDN terminal
A B channel for data transmission is established with the SDN terminal 1.

Conventionally, a voice call is possible only when this B channel is established, and a call using the hand cent 8 is started at this point.

After that, the call ends, and now the operator of the transmitting ISDN terminal 1 goes off-hook the handset 8.
The transmitting ISDN terminal 1 sends a disconnection message DISC to notify that the B channel has been restored. When the receiving ISDN terminal l receives this disconnection message DISC, it sends a release message REL notifying completion of channel disconnection to the ISD.
N, and the ISDN outputs a release message REL to the transmitting ISDN terminal 1. When the transmitting ISDN terminal 1 completes channel release, it sends a release completion message REL COMP to notify the ISDN, and the ISDN sends a release completion message RE.
L COMP is sent to the receiving ISDN terminal 1. As a result, the B channel is opened and the transmitting side ISDN
The B channel set between the terminal 1 and the receiving ISDN terminal 1 is completely released. Note that the B channel is also released by the receiving ISDN terminal being on-hook, and in this case, the receiving ISDN terminal 1 sends a disconnection message DISC.

However, in such conventional ISDN communication systems, calls are made using the B channel, so calls cannot be made until the B channel is established between the sending ISDN terminal 1 and the receiving ISDN terminal 1. unable to do it,
There was a problem that the usability of ISDN terminals was poor.

Therefore, in the present invention, it is possible to make a call using the D channel at the call setting stage.

That is, the operator of the transmitting ISDN terminal 1 takes the handset 8 off-hook, instructs the transmitting SDN terminal 1 to make a call to the receiving PIlsDN terminal 1, and also inserts the transmission key 4a. When the transmitting ISDN terminal 1 makes a call, it sends the call setup message 5ETUP as described above, and after going through a predetermined procedure, receives the response message C0NN. In the meantime, it is checked whether the transmission key 4a is inserted. During this time, when the transmit key 4a is turned on, the transmitting ISDN terminal 1 sends the voice data input from the hand center 8 to the call setting message 5ET, as shown in FIG.
The data is transmitted as UP user/user information element data (step S1), and the process returns to the normal transmission control procedure (step S2).

That is, ISDN messages are generally as shown in Figure 5 (
As shown in a), it consists of a protocol identifier, a call number, a message type, an essential information element, and an additional information element, and the protocol identifier is for identifying the protocol specification that defines the layer 3 call control message. Further, the call number is used to identify which call the message is related to, and the message type is used to identify the content of the message.

Essential information elements are always added to each message, and additional information elements are added to each message as necessary. Oll or a plurality of essential information elements are set depending on the message type, and 0.1 or a plurality of additional information elements are arranged depending on the situation.

In addition, as shown in FIG. 5(b), the call setup message 5ETUP has transmission capability as its essential information element, and information elements such as calling number, called party number, and user/user information as its additional information elements. have. This transmission capability information element indicates whether the content of the information to be transmitted is audio, unrestricted digital information, restricted digital information, 3KHz audio, 7KHz%, or video. the transfer mode indicating whether the switching function is circuit-switched or bucket-switched;
It consists of an information transfer rate indicating the speed of information transfer, information indicating the form of information transfer, information indicating the protocol of user information, etc. The calling number information element contains the ISDN address (number) of the calling terminal (sending terminal), and the called number information element contains the ISDN address (number) of the called terminal (receiving terminal).
Hail. Further, the user-to-user information element is used for transmitting information between users, and the content of this information is transparently transmitted to the other party's terminal without being interpreted by the network. Further, the more data information element shown in FIG. 5(c) is for indicating that the user-user information element continues, and the contents of this information element are not interpreted by the ISDN and are sent to the other terminal. Transmitted transparently.

The transmitting ISDN terminal 1 transmits the voice data inputted from the handset 8 as data of this user-user information element.

On the other hand, upon receiving the user-user information element, the receiving ISDN terminal 1 extracts the audio data from the user-user information element and stores it in the memory 3 (step Tl>. The data information is checked to see if more data continues (step T3), and if so, the normal transmission control procedure is returned to wait for the next user-user information element (step T4). .If the more data information element is checked and it is found that the data does not continue, the memory 3
The audio data stored in the controller is outputted as amplified sound using the speaker IO or the handset 8 (step T3), and the process returns to the normal transmission control procedure (step T4).

In this way, since voice data is included in the user information element of the call setup message 5ETUP for communication,
Voice data can be exchanged on the B channel during the call setup stage. As a result, it is possible to send a message to the other party by voice without going off-hook at the receiving ISDN terminal, thereby improving the usability of the ISDN terminal.

[Effects] According to the present invention, since it is possible to communicate by putting voice data in the user-to-user information element at the call setting stage, it is possible to communicate voice data at the call connection stage, and the receiving ISDN terminal It is possible to improve the usability of ISDN terminals, such as being able to send voice messages without going off-hook.

[Brief explanation of drawings]

1 to 6 are diagrams showing an embodiment of the ISDN communication method of the present invention, FIG. 1 is a block diagram of an ISDN terminal applied to the ISDN communication method, and FIG. 2 is a block diagram of the ISDN terminal applied to the ISDN communication method. A top view of the operation display unit, Fig. 3 is a sequence diagram of the ISDN communication, Fig. 4 is a flowchart of the voice data communication processing at the transmitting ISDN terminal, and Figs. 5 (a), (b), and (c), respectively. ISD during call setup
Message from N [Figure 5 (a)), call setup message 5
ETUP C FIG. 5(b)] and a diagram showing user/user information. FIG. 6 is a flowchart of voice data communication processing at the receiving ISDN terminal. DESCRIPTION OF SYMBOLS 1...--ISDN terminal, 2...--System control unit, 3--...Memory, 4--...Operation display unit, 4a--...-Send key 4b ...Numeric keypad 5...ISDN interface, 6...
・LAPD control section, 7.--Audio signal conversion section, 8.--Handsent, 9.--Tone generation section, lO...-Speaker. Figure 1 Figure 3 Figure 2 Figure 4 Figure 4

Claims (1)

[Claims] A transmitting ISDN terminal and a receiving ISDN terminal are each connected to the ISDN via a network termination device, and the transmitting ISDN
In an ISDN communication method in which communication is performed by executing ISDN communication call control procedures between a DN terminal and the receiving ISDN terminal, voice data is sent to the ISDN terminal to add voice data to the user/user information of the call connection control procedure. An ISDN communication system comprising: an additional means; and a voice data extraction means for extracting voice data from the user/user information, and capable of transmitting and receiving voice data at a call connection stage.