JPH05199320A - Isdn terminal equipment - Google Patents

Abstract

PURPOSE:To improve the reply of an incoming call when plural terminal equipments are connected to a same bus. CONSTITUTION:A delay time in the case of the arrival and reply to a parameter memory 4 is registered and the reply is made after lapse of a delay time registered at the arrival of the call. Furthermore, a sub address of other terminal equipment connecting to the same bus is registered to the parameter memory 4 and when an incoming sub address is not coincident with any of sub addresses to be registered, a reply is made. Even in the absence of a sub address, a reply is made at a specific terminal equipment. Moreover, a reply is made even when an incoming sub address is in error.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN terminal device using ISDN as a transmission line.

[0002]

2. Description of the Related Art ISDN has been developed to realize various communication services by integrating various communication media such as voice, text, and images and linking them with information processing technology.
(Comprehensive digital network for services) is becoming widespread, and is expected as the foundation of a hardness information society.

In this ISDN, the user / network interface is configured in a bus type, and up to eight terminal devices can be connected to one user / network interface. Usually, a plurality of terminal devices connected to the same user / network interface are set with subaddresses for identifying each.

Therefore, when a certain terminal device calls another terminal device, the ISDN number set in the destination user / network interface and the subaddress set in the target terminal device are designated to specify the ISDN. By sending the call setting message (message for calling request) to the terminal, the destination terminal device can be reliably called.

[0005]

However, the conventional device has the following problems.

That is, if the operator on the calling terminal side does not know the subaddress of the other terminal, that subaddress cannot be specified at the time of calling, so the call setup message to which the called subaddress is not added is the specified ISDN number. It is output in broadcast format from the user / network interface.

At this time, when a plurality of terminal devices are connected to the user / network interface, since each terminal device does not include the called subaddress information element in the call setup message, it is an essential information element of the call setup message. If it is determined that transmission is possible with the calling terminal based on the content of one transmission capability information element, a predetermined response message is sent to ISDN.
Send to.

That is, all the terminal devices that have determined that transmission is possible with the calling terminal send out a predetermined response message, and ISDN is the earliest of these, and information is sent between the device that output the response message and the calling terminal. Establish a channel.

[0009] However, there is an inconvenience that it is not possible to determine which destination terminal of the plurality of terminal devices is determined to be capable of transmitting the information transmission right with the calling terminal connected to the same user / network interface. It was

Further, in the conventional device, if the sub-address of the destination terminal device is erroneously specified, all the terminal devices connected to the destination user / network interface will ignore the incoming call. .. Even if the sub-address is specified incorrectly, it has not been possible to realize the setting to send to any of the terminal devices connected to the destination user / network interface.

[0011]

The present invention provides a setting means for setting an incoming call response delay time, and an incoming call response after the incoming call response delay time has elapsed when a sub-address is not included in a call setup message received at the time of an incoming call. The control means that enables the Therefore, by controlling the delay of the incoming call response of a plurality of terminal devices connected to the same user / network interface and the terminal attributes of the calling terminal and the called terminal do not become inconsistent, only one device relatively receives the call from the other device. When the received call setup message does not include the subaddress, only one of the device determined to be able to transmit and the calling terminal always obtains the right to transmit information by making the response quick.

Further, the present invention includes the same-bus connection sub-address storage unit for storing the sub-address of each device connected to the same bus wiring, and the sub-address for specifying the destination terminal in the call setup message received at the time of the incoming call. When
When the sub-address for identifying the destination terminal included in the call setup message does not match any of the sub-addresses stored in the same-bus-connector sub-address storage unit, a control means is provided for enabling an incoming call response. .. Therefore, it is possible to respond to the incoming call even when the sub-address for identifying the called terminal included in the call setup message does not match any of the sub-addresses stored in the same-bus-connector sub-address storage unit. Any device that can communicate with the calling device among the bus connection devices can receive the call.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a G4 facsimile apparatus according to an embodiment of the present invention.

In FIG. 1, a system control section 1 executes control processing of the entire G4 facsimile apparatus, and a system memory 2 stores a control processing program executed by the system control section 1 and its control processing program. The image data memory 3 is for storing various necessary data and the like, and the image data memory 3 is for storing the image data of the G4 facsimile apparatus.

The parameter memory 4 stores various kinds of information unique to the G4 facsimile machine, for example, subaddress information of each machine connected to the same bus and an incoming call response message C.
The communication control unit 5 is for storing the ONN delay time and the like, the communication control unit 5 is for executing the transmission control procedure processing of the IS4 compatible G4 facsimile apparatus, and the operation unit 6 is for operating the G4 facsimile apparatus. It is for doing.

The B channel transmission control unit 7 is for performing transmission control processing on the information channel (B channel), and the D channel transmission control unit 8 is for performing transmission control processing on the signal channel (D channel). The ISDN interface circuit 9 is
It is for connecting a facsimile machine to an ISDN.

The scanner 11 scans a document, photoelectrically converts it, and 2
The printer 1 reads the image data after binarizing
Reference numeral 2 is for printing image data, and the compression / expansion unit 13 is for compressing the original image data to create compressed data, or for expanding the compressed data to create original image data.

The operation unit 6 registers parameters such as the delay time of the incoming call response message CONN in the parameter memory.

The system controller 1, the system memory 2, the image memory 3, the parameter memory 4, the communication controller 5, the operation unit 6, the B channel transmission controller 7, the scanner 11, the printer 12, the compression / expansion unit 13 are the system bus 10. The system bus 10 is used to exchange information between these elements.

FIG. 4 shows an example of the storage configuration of the sub-address information of each device connected to the same bus, which can store up to eight sub-addresses. The registration of the sub-address information is performed by the operation unit 6 in this embodiment.

Now, referring to FIG. 3, this ISDN
The basic data transfer procedure of the G4 facsimile machine which is a terminal device will be described below.

As shown in FIG. 3A, the calling terminal sends a call setup message SETUP to the ISDN to request call setup with the called terminal, and the ISDN sends the call setup message SETUP to the designated called terminal. To send a call. Also, I
The SDN sends a call setting acceptance message CALL-PROC for notifying the call setting status to the calling terminal.

Upon detection of an incoming call, the destination terminal sends out a calling message ALERT to the ISDN continuously at a predetermined interval when it is ready to receive an incoming call.
N sends a calling message ALERT to the calling terminal to notify that the calling of the called terminal has started.

When the destination terminal answers the incoming call, the response message C
The ONN is sent to the ISDN, and the ISDN sends a response message CONN to the calling terminal to notify that the called terminal has accepted the call.

Further, the ISDN sends a response confirmation message CONN-ACK to the destination terminal to confirm the response of the destination terminal, and at that time, an information channel for data transmission is established between the source terminal and the destination terminal. ..

As a result, the data transmission using the information channel is executed between the calling terminal and the called terminal according to the transmission control procedure set in the transmission function of each terminal.

When the data transmission is completed, the calling terminal sends a disconnection message DISC to ISDN to request the release of the information channel, and ISDN disconnects the disconnection message DISC.
C is sent to the destination terminal to notify the restoration of the information channel.

As a result, when the called terminal responds to the ISDN with a release message REL notifying the completion of the channel disconnection, the release message REL is sent from the ISDN to the calling terminal. When the channel release is completed, the calling terminal sends a release complete message REL-COMP to the ISDN to notify it, whereby the ISDN sends a release complete message RED-COMP to the called terminal to release the information channel. When established, the information channel set up between the calling terminal and the called terminal is completely released.

In this way, the information channel is set up between the calling terminal and the called terminal, data transfer is performed, and when the data transmission is completed, the information channel is released.

When a plurality of destination terminals connected to the same user / network interface simultaneously responds to incoming calls,
Only the destination terminal that has sent the response message CONN earliest to the ISDN can establish the information channel for data transmission with the source terminal by the above procedure.

On the other hand, when a plurality of destination terminals connected to the same user / network interface respond to the incoming call at the same time, the terminal which has sent the response message CONN after the second is as shown in FIG. 3 (b). Releasing message REL is received from ISDN, and releasing completion message RE is received.
L-COMP will be sent to ISDN, and call disconnection recovery will be performed.

As shown in FIG. 5, the call setup message SETUP has a transfer capability as an essential information element, and as additional information elements, for example, the calling number, the calling subaddress, the called number, the called subaddress, the lower layer compatibility, and the higher layer. It has information elements such as layer consistency and user / user information.

An outline of these information elements will be described.

In the transmission capability information element, the contents of information to be transmitted are voice, unrestricted digital information, restricted digital information,
3.1 KHz audio, 7 KHz audio, information transfer capability indicating whether it is video, transfer mode indicating whether the switching function used is circuit switching or packet switching, information transfer rate indicating the speed of information transfer , Information indicating a transfer mode of information, information indicating a protocol of user information, and the like.

The calling number information element represents the ISDN number of the calling terminal, the calling subaddress information element represents the subaddress of the calling terminal, the called number information element represents the ISDN number of the called terminal, and the called subaddress information element is Indicates the sub address of the destination terminal.

The lower layer compatibility information element is used for checking the communication possibility with the partner terminal, and basically has the same content as the transmission capability information element. The lower layer compatibility information element includes more detailed content.

The higher layer compatibility information element is for use in a consistency check with the partner terminal, and is G2 / G3.
It indicates which of facsimile, G4 facsimile, mixed mode, teletex, videotex, telex, and message handling system is provided as a terminal function.

The user-user information element is for transmitting information between the calling terminal and the called terminal, and its content is
It is transparently communicated to the user without being interpreted by ISDN.

A flowchart of FIG. 6 shows the first operation of the system control unit 1 and the communication control unit 5 in the G4 facsimile apparatus of this embodiment when the call setup message SETUP is received from the ISDN with the above-mentioned configuration. Will be explained.

First, at 101, based on the transfer capability information element, the lower layer compatibility information element, the higher layer compatibility information element, etc. in the call setup message, whether the terminal attributes of the calling terminal and the called terminal do not match. Check and if YES, 10
Ignore the incoming call at 7. (That is, no signal including ALERT is sent.) The result of 101 is NO.
In the case of (when the terminal attributes of the calling terminal and the called terminal do not match, for example, when only the transfer capability information element is included in the call setup message, it is determined only by that information, and the lower layer consistency information element and the higher layer If the consistency information element is also included, it is determined including that information as well.) 102, it is checked whether or not the call setup message SETUP includes the called subaddress information element.

When the result of 102 is YES, it is checked in 106 whether the called subaddress information element matches the subaddress registered in the called terminal.

When the result of 106 is YES, the incoming call process is immediately performed at 105. That is, CONN is sent immediately after sending ALERT.

When the result of 106 is NO, the incoming call is ignored at 107.

If the result of 102 is NO, 103, 10
An incoming call response is made after a predetermined delay time in a series of processes 4 and 105. That is, at 103, the incoming call delay timer is started, and at 104, whether a predetermined incoming call delay time has elapsed,
That is, it is checked whether or not the incoming call delay timer is up. If 104 is NO, 104 is repeated, and if 104 is YES, incoming call response is started at 105.

In this way, the delay of the incoming call response of a plurality of terminal devices which are connected to the same user / network interface and whose terminal attributes of the calling terminal and the called terminal do not become inconsistent is controlled, and only one device is relatively operated. If the received call setup message does not include the subaddress by making the incoming call answer earlier than the other devices, only one of the devices determined to be able to transmit and the calling terminal must obtain the right to transmit information. To

For example, as shown in FIG. 2, the IS4 network terminating device NT1 has a G4 facsimile device G4A1, a G4 facsimile device G4A2, and a teletex device T.
Three XA's are connected to the bus, and only the G4 facsimile machine is connected to the network terminating device NT2 as G4B1, G4B2, ...
When 8 buses are connected to G4B8, for example, G4
It is assumed that the response messages CONN of the seven devices G4B2, ..., G4B8 excluding B1 are set to be delayed by a predetermined time.

At this time, when the G4 facsimile apparatus G4A1 makes a call to the user / network interface of the network terminator NT2 without specifying (or forgetting to specify) the called subaddress, G4B1 responds earliest following ALERT. Sends the message CONN. Then, G4B1 which has sent CONN earliest can establish an information channel with the calling terminal and receive the transmitted document, and other devices are forced to release the call setting by ISDN.

Next, with the configuration shown in FIG. 1, the second operation of the system control unit 1 and the communication control unit 5 in the G4 facsimile apparatus of this embodiment when the call setting message SETUP is received from the ISDN is shown in FIG. This will be described using a flowchart. First, in 701, based on the transfer capability information element, the lower layer compatibility information element, the higher layer compatibility information element, etc. in the call setup message, it is checked whether the terminal attributes of the calling terminal and the called terminal do not match, If yes, 7
The incoming call is ignored at 06. (That is, no signal including ALERT is transmitted.) The result of 701 is N
In the case of O (when the terminal attributes of the calling terminal and the called terminal cannot be said to be inconsistent, for example, when only the transfer capability information element is included in the call setup message, it is determined only by the information, and the lower layer compatibility information element, If the higher layer compatibility information element is also included, it is determined including such information as well.) 702
Then, it is checked whether or not the call setup message SETUP includes the called sub address information element.

When the result of 702 is NO, in 704, the incoming call process is performed in this embodiment. Ie ALE
Sends RT and CONN. When a plurality of terminals are connected to one user / network interface, the terminal which sends CONN earliest can establish an information channel with the calling terminal.

When the result of 702 is YES, it is checked in 703 whether the called subaddress information element matches the subaddress registered in the called terminal.

If the result of 703 is YES, an incoming call process is performed at 704.

If the result of 703 is NO, then in 705, it is checked whether the called subaddress information element matches any of the subaddresses of the respective devices connected to the same bus registered in the called terminal.

If the result of 705 is NO, the incoming call processing is performed in 704, and if YES, the incoming call is ignored in 706.

As described above, even when the sub-address for identifying the called terminal included in the call setup message does not match any of the sub-addresses stored in the same-bus-connector sub-address storage unit, the call setup message SE
Similarly to when the destination address is not included in the TUP, the incoming call response can be performed, and any of the same bus connection devices that can communicate with the calling device can receive the incoming call.

For example, as shown in FIG. 2, a network terminating device NT1 of ISDN, a G4 facsimile device G4A1, a G4 facsimile device G4A2, and a teletex device T are provided.
Three XA's are connected to the bus, and only the G4 facsimile machine is connected to the network terminating device NT2 as G4B1, G4B2, ...
Eight buses are connected to G4B8. In this case G4
Facsimile device G4A1 is G4 facsimile device G4
A call is made by designating the destination subaddress to B1 and the destination address is incorrectly designated, and not only the destination address of the G4 facsimile device G4B1 but also each of the G4 facsimile devices G4B2, ..., G4B8 connected to the same bus. When the destination address also does not match, all G4 facsimile apparatuses send ALERT and CONN to respond to the incoming call.

Then, the terminal which has sent the CONN earliest can establish the information channel with the calling terminal and receive the transmitted document. Since the terminal devices connected to the same user / network interface are often installed relatively close to each other, even if the transmission to the destination G4 facsimile is unsuccessful, it is transmitted to the neighboring G4 facsimile. .. Therefore, the transmitted document is delivered to the original recipient.

This function is very effective for a user who wants to make a setting to send to any terminal device connected to the destination user / network interface even if the subaddress is incorrectly specified.

When the subaddress does not match any of the terminal devices connected to the destination user / network interface due to the intention of the transmitting side, the user / user information is used to negotiate an instruction as to whether or not to perform the incoming operation. You may do so.

[0060]

As described above, according to the present invention,
By controlling the delay of the incoming call response of a plurality of terminal devices that are connected to the same user / network interface and the terminal attributes of the calling terminal and the called terminal do not match, only one device can receive the incoming call response relatively from other devices. By making it earlier, if the received call setup message does not include the sub-address, only one of the devices determined to be able to transmit and the calling terminal has the right to transmit information. The user on the receiving side does not need to pay attention to all terminals connected to the same user / network interface in response to the incoming call, and only needs to pay attention to one terminal.

That is, for example, the calling machine is a G4 facsimile machine, and the called user / network interface is G4.
When only multiple fax machines are connected, depending on the called side, there will be no problem because an incoming call containing a called subaddress will be received by the device with that called subaddress. It suffices to pay attention to one predetermined device. That is, if the device is an automatic receiving device, it is sufficient to check only the device of its own subaddress and its predetermined device for a facsimile document.

Therefore, the efficiency of the user's work can be significantly improved.

Further, according to the present invention, even if the sub-address for identifying the called terminal included in the call setting message does not match any of the sub-addresses stored in the same-bus-connector sub-address storage unit, an incoming call response is given. Therefore, any device of the same bus connection devices that can communicate with the calling device can receive a call.

That is, when the calling machine is a G4 facsimile machine and only a plurality of G4 facsimile machines are connected to the destination user / network interface, even if the subaddress of the destination terminal device is erroneously specified, Any G4 facsimile device connected to the user / network interface can respond to the incoming call. Normally, the terminal devices connected to the same user / network interface are installed relatively close to each other, so that even if the destination G4 facsimile cannot be transmitted, it is transmitted to the neighboring G4 facsimile. There is a high probability that the sent document will be delivered to the original recipient.

Therefore, even if the sub-address is specified incorrectly, it is very effective for a user who wants to make a setting to send to any terminal device connected to the destination user / network interface.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a G4 facsimile apparatus according to an embodiment of the present invention.

FIG. 2 is a network configuration diagram based on ISDN.

FIG. 3 is a transmission procedure diagram between ISDN terminal devices.

FIG. 4 is a storage configuration diagram of sub-addresses of the same bus connector.

FIG. 5 is an information element diagram in a call setup message.

FIG. 6 is a flowchart showing a first processing example when an incoming call is received.

FIG. 7 is a flowchart showing a second processing example when receiving a call.

[Explanation of symbols]

 1 system control unit 2 system memory 4 parameter memory 5 communication control unit 6 operation unit

Claims (3)

[Claims] 1. A setting means for setting an incoming call response delay time, and a control means for enabling an incoming call response after the incoming call response delay time has elapsed when a call setup message received at the time of incoming call does not include a called subaddress. An ISDN terminal device, comprising: 2. A same-bus-connector sub-address storage unit that stores sub-addresses of respective devices connected to the same bus wiring; and a sub-address that identifies a destination terminal in a call setting message received when an incoming call arrives, When the sub-address for identifying the destination terminal included in the call setup message does not match any of the sub-addresses stored in the same-bus-connector sub-address storage unit, a control means is provided for enabling an incoming call response. Let I
SDN terminal equipment. 3. The incoming call response is sent when the sub-address, which is included in the call setup message and which identifies the destination terminal, does not match any of the sub-addresses stored in the same-bus-connector sub-address storage unit. 3. The ISDN terminal device according to claim 2, wherein whether or not to enable the ISDN terminal device is determined by negotiating with the transmitting terminal based on user / user information included in the call setup message.