JPH05176083A - Calling setting method between isdn terminal equipment - Google Patents

Abstract

PURPOSE:To always efficiently attain a communication by temporarily cutting a calling, and then operating a recalling in an optimal communication mode, when the calling is not operated in the optimal communication mode whose transmitting efficiency is high. CONSTITUTION:A G3 communication processing part 2 is equipped with a modem or a codex, and the G3 communication processing part 2 transmits and receives picture information by a prescribed transmission control procedure in a G3 mode, and the modem modulates the data signal of the picture information into a voice band signal, or demodulates the voice band signal into the data signal of the picture information. And also, a G4 communication processing part 3 transmits and receives the picture information by the prescribed transmission control procedure in a G4 mode. Then, when the communicating function of an incoming side is not recognized, a calling side operates the calling in the G3 mode, and communicates that its own device can be used in both the G3/G4 modes to the incoming side by user/user information. The incoming side communicates that its own device has the communicating function in the G4 mode by the user/user information of a calling message 'AFTER', and the calling side receiving the information temporarily cuts the calling, and operates the recalling in the G4 mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call setting method between ISDN terminal devices having a function of communicating in a plurality of communication modes having different transmission efficiencies.

[0002]

2. Description of the Related Art In ISDN, a calling terminal device sets information elements such as transfer capability, high layer compatibility or low layer compatibility in a call setup message "SETUP" according to the communication function of the terminal device. Make a call. Upon receiving the call setup message "SETUP", the receiving side terminal device determines whether or not communication with the calling side terminal device is possible based on the above information elements, and if it determines that communication is possible, responds to the predetermined communication. Take steps.

By the way, in ISDN, a facsimile machine for both G3 and G4 modes, which can communicate in both G3 mode and G4 mode, is often used.

CCITT is studying the specifications for setting the above-mentioned information elements corresponding to the respective communication functions when the terminal device having the two kinds of communication functions makes a call, as described above. Details have not been decided and have not been put into practical use.

For this reason, in the above-mentioned G3 / G4 mode facsimile machine, when a call is made to a destination facsimile machine whose communication mode is unknown, the calling operator communicates with one of the facsimile machines. You will need to set the mode and make outgoing calls.

Here, for example, if a call is made in the G4 mode setting, communication cannot be performed if the destination is a G3 mode facsimile machine. In this case, the operator must change the setting to the G3 mode and perform the call operation again.

On the other hand, if a call is made in the G3 mode setting, communication will be executed in the G3 mode if the other party also has the same G3 / G4 mode. For this reason, the communication function of the G4 mode that is provided is not used, the communication time becomes long, and the efficiency of image transmission deteriorates.

[0008]

As described above, the prior art is as follows.
When the G3 / G4 mode combined facsimile apparatus makes a call, there is a problem in that it takes time and effort to make a call operation and the efficiency of image transmission is reduced. In addition, such a problem,
Not limited to a facsimile machine, I having a plurality of communication functions
The same applies to various terminal devices of SDN.

An object of the present invention is to solve the above problems and to provide a communication method for an ISDN terminal device which does not require any trouble in making a call operation and can always perform efficient communication.

[0010]

To this end, according to one invention of the present application, in the case where the communication mode setting of the received call setting message is not the optimum communication mode with high transmission efficiency, the receiving side terminal device , The optimum communication mode is notified to the calling terminal device by a certain method, and once the optimum communication mode is notified, the calling terminal device disconnects the call once and then calls again in the optimum communication mode to communicate. I have to.

According to another aspect of the invention, the receiving side terminal device notifies the calling side terminal device of various communication modes having a communication function by a certain method after receiving the incoming call, and the calling side terminal device:
When the call is not made in the optimum communication mode with high transmission efficiency, the call is disconnected once, and then the call is made again in the optimum communication mode for communication.

[0012]

When the communication mode set for the first call is not the optimum communication mode with the highest transmission efficiency, the calling terminal automatically re-calls and communicates in the optimum communication mode. You will be able to communicate efficiently at all times without the hassle of operations.

[0013]

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

FIG. 1 is a block diagram of a facsimile apparatus according to the first embodiment of the present invention. In the figure, a facsimile image processing unit 1 reads an original image, compresses data of image information obtained thereby, restores received image information and records it on a recording sheet.

The G3 communication processing section 2 is provided with a modem and a codec and transmits and receives image information according to a predetermined transmission control procedure in the G3 mode. The modem is for modulating a data signal of image information into a voice band signal or demodulating the voice band signal into a data signal of image information. The codec converts a voice band signal into a 64 kbps data signal and vice versa. The G4 communication processing unit 3 transmits and receives image information according to a predetermined transmission control procedure in the G4 mode. ISDN interface section 4
Is connected to the ISDN via a network terminating device (not shown),
Call control is performed when making and receiving calls.

The operation display section 5 displays the operating state of the apparatus while the operator performs various operations. The control unit 6 is a microcomputer that monitors and controls each of the above units.

Next, the communication operation of the facsimile apparatus of the present embodiment having the above configuration will be described.

When making a call with this facsimile apparatus, the operator sets the communication mode to G3 or G4 by a predetermined operation according to the communication function of the other party's apparatus, and makes a call operation. Also, if you do not know the communication function of the other device,
Set unknown and make outgoing call.

The facsimile apparatus is activated by the transmission operation, and determines the set communication mode as shown in FIG. 2 (process 101). For example, if the communication mode is set to unknown (“unknown” in process 101), the call setting message “SETUP” is transmitted with a known setting in the G3 mode to make a call. At this time, the user / user information (abbreviated as UUI in the figure) is included in the message.
As, the function information indicating that the device itself is a dual-purpose machine in the G3 / G4 mode is set (process 102). And
The response from the other party is monitored (process 103).

Call setup message "SETUP" sent
Is transmitted to the destination via ISDN, as shown in FIG. In addition, the call setting acceptance message “C
"ALL PROC" is returned.

On the other hand, when the destination facsimile machine receives the call setup message "SETUP" as shown in FIG. 4 (process 201), it determines the communication mode set by the message (process 202). Here, in the case of the G3 mode (Y in process 202), it is determined whether or not user / user information is added (process 203).

If user / user information is added (Y in step 203), the communication function of the calling side is discriminated from the set function information (step 204). If the calling side has the G4 mode communication function (Y in process 204), the calling message "ALERT" is transmitted. At this time, information indicating that G4 mode communication is possible is set in the message as user / user information (process 205). The call message "ALERT" is sent to the calling party via ISDN.

The calling party receives the calling message "ALERT" in which the user information is set (see FIG. 2).
(Y) in process 103), the communication function of the receiving side is determined based on the user / user information (process 104).

Here, when the receiving side can communicate in the G4 mode (Y in process 104), a predetermined call disconnection recovery procedure is executed once. That is, as shown in FIG. 3, first, the disconnection message "DISC" is transmitted. ISDN responds to this with a release message "REL",
A disconnection message "DISC" is sent to the destination. Upon receiving the release message "REL", the calling facsimile sends out a release message "REL COMP" (process 105).

The destination facsimile machine executes the call disconnection recovery procedure corresponding to the originating side with the ISDN (process 206 in FIG. 4).

After that, the calling side facsimile machine changes the setting to the G4 mode and executes a predetermined call setting message "SETU".
"P" is sent to call again (process 106 in FIG. 2). When the called side receives the call setup message "SETUP" (process 207 in FIG. 4), the called side message "ALERT" and the response message "CON" are received, as shown in FIG.
N "is sent. ISDN responds with a confirmation message "C
While responding "ONN ACK", the response message "CONN" is sent to the calling side, and the predetermined call setup procedure is completed (FIG. 4, process 208, FIG. 2, process 107).

After that, the image is transmitted between the facsimile machines on the calling side and the called side (process 108 in FIG. 3, process 20 in FIG. 4).
9). When the image transmission is completed, the calling side stores the communication capability of the called side facsimile apparatus (process 109 in FIG. 2). Then, each facsimile machine executes the call disconnection recovery procedure (process 110 in FIG. 2, process 210 in FIG. 4) and ends the communication.

By the way, it is assumed that, when the calling side facsimile machine makes a call as described above, the called side is a facsimile machine dedicated to the G3 mode. In this case, the called party uses the user / user information (UU) of the calling message "ALERT".
In step I), the calling side is notified that it is for G3 mode only. In this case (N in process 104), the calling side executes the predetermined call setting procedure as it is (process 107) and communicates in the G3 mode (to process 108). It is also assumed that the receiving side is a conventional facsimile machine dedicated to the G3 mode. in this case,
The called side responds with a call message "ALERT" having no user-user information (UUI). Also in this case (N of processing 103), communication is similarly performed (processing 107).
What).

On the other hand, when the calling side facsimile machine is set in the G3 mode and activated (“G” in step 101).
3 ”), and a call is made in the G3 mode setting (process 111).
Here, if the receiving side is a G3 mode facsimile apparatus, communication is similarly performed according to a predetermined call setting procedure (process 1).
07).

When the G4 mode is set and activated (“G4” in process 101), the call is made in the G4 mode setting (process 112), and the called side has the communication capability in the G4 mode. Executes a predetermined call setup procedure (process 1
07), and communicate in the G4 mode (to process 108).

Further, the facsimile apparatus of this embodiment is
It is assumed that an incoming call is made from a facsimile device dedicated to G3 mode. In this case, the call setup message "SETU
The user-user information (UUI) of “P” is informed that it is exclusively for the G3 mode. In this case (N in FIG. 4, process 204), the receiving side executes a predetermined call setup procedure (process 2).
08), and communicate in the G3 mode (to process 209).

It is also assumed that an incoming call is made from a conventional facsimile machine dedicated to the G3 mode. In this case, the user-user information (UUI) indicating the communication capability is not received in the call setup message “SETUP”. In this case as well (N in process 203), communication is performed in the same manner as described above (to process 208).

As described above, in this embodiment, when the calling side does not know the communication function of the called side, the calling side makes a call in the G3 mode, and at that time, the calling side uses the user / user information as the G3 / G.
Notify the receiving side that it is a dual-purpose machine in 4 modes, and the receiving side
In the case of having the G4 mode communication function, the fact is notified to the calling side by the user / user information of the calling message "ALERT". When the calling party receives the notification, the calling party disconnects the call and calls again in the G4 mode.

As a result, the operator does not have to make a transmission operation, and the image transmission can always be performed efficiently.

Further, as described in the process 109 of FIG. 2, the calling side terminal device is configured to store the communication function of the called side after the communication is executed. With this, the next time you make a call,
For example, the operator refers to the stored information and sets the communication mode, so that the communication can be smoothly performed.

By the way, in the above-mentioned embodiment, the facsimile apparatus which transmits the image in the two kinds of communication modes of the G3 mode and the G4 mode is taken as an example, but the present invention is not limited to the facsimile apparatus and the communication is carried out in plural communication modes. Various ISDN
It can be applied to a terminal device.

For example, now, the call setting message "SET
It is assumed that there is a terminal device having three or more types of communication mode setting methods in "UP". And each communication mode,
It is assumed that the transmission efficiency is high and low, and that one specific communication mode can be communicated with by any terminal device.

In this case, the calling side sets a specific one communication mode in the call setup message "SETUP" to make a call, and at this time, the information of the communication mode in which the own device can communicate is provided by the user / user information. Notify the recipient. When the called side sends the calling message "ALERT",
The calling side is notified of one optimum communication mode that allows communication with the calling side with the user information and has the highest transmission efficiency. If the communication mode that is set is the optimum communication mode, the calling side continues the call setting procedure and continues communication.If it is not the optimum communication mode, the caller disconnects and re-calls in the optimum communication mode. connect.

As described above, according to the present invention, the same processing can be performed even when there are three or more communication modes, and the same operational effect can be obtained.

In the above embodiment, the calling side notifies the receiving side of various communication modes in which the calling side can communicate, and the calling side notifies the calling side of one optimum communication mode. However, the calling side communicates to the called side. The information requesting the capability inquiry is transmitted, the receiving side notifies the transmitting side of various communication modes in which the own device can communicate, and the transmitting side
Based on the notified information, it is also possible to communicate or call again as it is, as in the above.

Further, in order to transmit the communication mode information and the command information from the calling side to the called side, the call setting message "SETU
The user / user information of "P" is used, but it is also possible to use a subaddress which is another information element. The subaddress is basically used to identify each terminal device on the receiving side, but a number is defined for each of the communication mode information and command information, and the number is transmitted as a subaddress. The destination terminal device can be identified as communication mode information or command information. As a result, the same operation as described above can be executed.

Further, the called side receives the calling message "AL
Although the communication mode information is transmitted to the calling side by the user / user information of "ERT", the call / set message "SETUP" is transmitted after the incoming call to communicate with the user / user information and sub-address information. It is also possible to send mode information.

That is, in this case, as shown in FIG.
The calling side first sets a specific communication mode common to the called side in the call setting message "SETUP" and calls. At this time, the caller side is notified of various communication modes in which the caller side has a communication function, based on the user / user information and the like.

The receiving side receives the call setting message "SE
When the setting of the communication mode of "TUP" is not the optimum communication mode with high transmission efficiency, the call setting message "SETUP" is sent out and the calling operation is executed without responding to the call. At this time, the call setup message "SETUP"
The optimum communication mode is notified to the calling side by the user / user information or the sub-address information. In this case, the calling party
The call disconnection procedure is executed once, and the call is recalled and communicated in the optimum communication mode.

Even with such a procedure, it is possible to obtain the same effects as those of the above-described embodiments.

[0046]

As described above, according to the present invention, the receiving side notifies the calling side of the communication mode information of the own device, and the calling side
If the call is not made in the optimum communication mode with high transmission efficiency, the call is disconnected once, and the call is made again in the optimum communication mode to perform communication, so that the operator does not have to spend time for the outgoing call operation. You will always be able to communicate efficiently.

[Brief description of drawings]

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

FIG. 2 is an operation flowchart of a calling side facsimile apparatus.

FIG. 3 is an explanatory diagram of a call setting procedure between each of the facsimile machines on the calling side and the called side.

FIG. 4 is an operation flowchart of a destination facsimile machine.

FIG. 5 is an explanatory diagram of a call setting procedure between each terminal device on the calling side and the called side according to another embodiment of the present invention.

[Explanation of symbols]

 1 Facsimile image processing unit 2 G3 communication processing unit 3 G4 communication processing unit 4 ISDN interface unit 5 Operation display unit

Claims (7)

[Claims] 1. A call setup method between ISDN terminal devices having a function of communicating in a plurality of communication modes having different transmission efficiencies, wherein the receiving side terminal device sets the communication mode of the received call setup message to the transmission efficiency. If the optimum communication mode is not high, the optimum communication mode is notified to the calling terminal device by the user / user information of the call control message to be sent, and the calling terminal device disconnects the call once, and then the optimum communication mode is set. Is set in the call setup message, the call is made again, and the call is communicated. 2. A call setup method between ISDN terminal devices having a function of communicating in a plurality of types of communication modes having different transmission efficiencies, wherein the called terminal device sends a call control message to a user / user of an incoming call. The information notifies the calling side terminal device of various communication modes having a communication function, and the calling side terminal device discriminates one of the notified communication modes having the highest transmission efficiency. , If the determined optimum communication mode and the communication mode set at that time are the same, communication is performed with the setting, while if the optimum communication mode and the communication mode set are different, A call setting method between ISDN terminal devices, characterized in that the optimum communication mode is set in a call setting message, and the call is made again for communication after disconnecting the call. 3. A call setup method between ISDN terminal devices having a function of communicating in a plurality of communication modes having different transmission efficiencies, wherein the receiving side terminal device sets the communication mode of the received call setup message to the transmission efficiency. If the optimum communication mode is not high, the call setting message is sent to the calling terminal device without answering the incoming call, and the device itself has a communication function by the additional information of the call setting message. One optimal communication mode with high transmission efficiency is notified to the calling terminal device, and the calling terminal device disconnects the call to the called side and the called side from the called side once. A call setting method between ISDN terminal devices, characterized in that the optimum communication mode is set in a call setting message and a call is made again to perform communication. 4. A call setup method between ISDN terminal devices having a function of communicating in a plurality of communication modes having different transmission efficiencies, wherein the receiving side terminal device sets the communication mode of the received call setup message to the transmission efficiency. If the optimum communication mode is not high, the call setting message is sent to the calling terminal device without answering the incoming call, and the device itself has a communication function by the additional information of the call setting message. The calling terminal device, and the calling terminal device discriminates one optimal communication mode having a high transmission efficiency from among the notified communication modes, and the determined optimal communication mode If the communication mode set at that time is the same, communication is performed with that setting.On the other hand, if the optimum communication mode and the set communication mode are different, communication to the receiving side is performed. A call between ISDN terminal devices, characterized in that after the call is disconnected for an outgoing call and an incoming call from the called side, the optimum communication mode is set in a call setting message and the call is made again for communication. Setting method. 5. The notification of the communication mode from the receiving side terminal device to the calling side terminal device is performed by user-user information which is one of the information elements of various call control messages. Item 4. A call setup method between ISDN terminal devices according to Item 4. 6. The notification of the communication mode from the receiving side device to the calling side terminal device is performed by subaddress information which is one of the information elements of the call control message. A call setup method between ISDN terminals. 7. The calling side terminal device stores the information of the communication mode notified from the receiving side terminal device even after the end of communication, according to claim 1, claim 2 or claim 3.
Alternatively, the call setup method between the ISDN terminal devices according to claim 4.