JPH0281540A - Facsimile repeater - Google Patents

Abstract

PURPOSE:To realize picture information transmission between facsimile equipments without adding any function to the facsimile equipment by transferring received picture information while it is converted into receptible picture information when relay request to a facsimile equipment connected to a PSTN from a facsimile equipment connecting to an ISDN is received. CONSTITUTION:When a relay request from a group 4 facsimile equipment FX4 connecting to the ISDN(integrated service digital communication network) to a group 3 facsimile equipment FX3 connecting to a PSTN (analog line network) is received, a repeater CM transfers the received picture information while converting it into picture information receptible by the group 3 facsimile equipment FX3. On the other hand, when a relay request from the group 3 facsimile equipment FX3 to the group 43 facsimile equipment FX4 connecting to the ISDN is received, the repeater transfers the received picture information while converting it into picture information receptible by the group 4 facsimile equipment FX4. Thus, the mutual picture information transmission between the group 4 facsimile equipment FX4 connected to the ISDN and the group 3 facsimile equipment FX3 connecting to the PSTN is realized without adding any function to the group 4 facsimile equipment FX4.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention enables image information transmission between a Group 4 facsimile machine connected to an ISDN and a Group 3 facsimile machine connected to an analog line network. The present invention relates to a facsimile relay device.

[Background Art] In recent years, ISDN (Integrated Service Digital Communication Network) has been developed, and data terminal devices that exchange data using ISDN are gradually coming into use.

This ISDN is intended to replace the previous PSTN (Public Telephone Network) in the future, but it is thought that it will take a considerable number of years until the replacement is completely completed, and during that time the ISDN and PS-TN will be used. Further, in this case, it is considered that ISDN and PSTN are mutually connected, and it is possible for a data terminal device connected to ISDN and a data terminal device of the same type connected to PSTH to exchange data.

Now, when transmitting image information by a facsimile device using ISDN, it is conceivable to connect an existing group 3 facsimile device to the ISDN via a terminal adapter.

However, the data transmission rate of Group 3 facsimile machines is at most 9.6 Kbps, and the data transmission rate of the ISDN information channel (B channel) is 64 Kbps.
It is far below Kbps, and ISDN cannot be used effectively.

Therefore, as a facsimile device that can effectively utilize ISDN functions, CCITT (International Telegraph and Telephone Consultative Committee)
Group 4 facsimile machines are recommended.

Therefore, it is thought that use of this group 4 facsimile device will become mainstream in ISDN.

On the other hand, since the PSTN is still in use, there is a need to transmit image information between Group 3 facsimile machines connected to the PSTN and Group 4 facsimile machines connected to the ISDN. come.

As mentioned above, since interoperability between ISDN and PSTN is being considered, there is a need for data transmission between Group 4 facsimile machines connected to ISDN and Group 3 facsimile machines connected to PS-TN. communication path can be formed.

However, since Group 4 facsimile machines and Group 3 facsimile machines differ in the transmission procedures used, the encoding method of image information that can be transmitted, and the resolution, etc., Group 3 facsimile machines and Group 4 facsimile machines differ in Even if a communication path is formed,
Image information cannot be transmitted between them.

Therefore, in order to transmit image information between a Group 4 facsimile machine connected to the ISDN and a Group 3 facsimile machine connected to the PSTN, it is necessary to equip the Group 4 facsimile machine with the Group 3 facsimile machine function. .

[Problems to be Solved by the Invention] However, if the facsimile machine is equipped with two groups and three facsimile machine functions as described above, the cost of the group four facsimile machine becomes high, which hinders its widespread use.

The present invention has been made in view of the above circumstances, and provides a facsimile relay device that can realize image information transmission between a group 3 facsimile device connected to the PSTN and a group 4 facsimile device connected to the 15OH. is intended to provide.

[Means for Solving the Problems] The present invention provides an ISDN communication function, a Group 4 facsimile device function, a PSTN (analog line network) communication function, a Group 3 facsimile device function, and a group 3 Equipped with an image information conversion function that mutually converts image information compatible with the facsimile device, a single-image information storage function, and a function that determines the type of line network to which the terminal device is connected based on destination information.
When a group 4 facsimile machine makes a call and is notified of a relay request, the image information received at that time is stored, and after the reception is completed, the line to which the relay destination is connected is determined based on the notified relay destination information. The relay destination is the ISD.
If it is determined that the relay destination is connected to an analog line network, it calls the relay destination using ISDN and sends the accumulated image information. A call is made to the relay destination, and based on the encoding method notified at that time, the accumulated image information is converted into image information that the relay destination can receive, and the converted image information is transmitted to the relay destination. Also, when a group 3 facsimile machine makes a call and is notified of a relay request, the image information received at that time is stored, and after the reception is complete, the relay destination is connected based on the notified relay destination information. Determine the network.

When it is determined that the relay destination is connected to ISDN, it calls the relay destination via ISDN, converts the stored image information into image information that the relay destination can receive, and then sends the image information after the conversion. When it is determined that the relay destination is connected to the analog line network, the relay destination is called over the analog line network, and the accumulated image information is transmitted to the relay destination based on the encoding method notified at that time. The image information is converted into receivable image information, and the converted image information is transmitted to the relay destination.

[Operation] Therefore, from a group 4 facsimile machine connected to the ISDN to a group 3 facsimile machine connected to the PSTN,
When a relay request to a facsimile device is received, the received image information is converted into image information that can be received by the group 3 facsimile device and then transferred, while the group 3 facsimile device transfers the image information to the group 4 facsimile device connected to the ISDN. When receiving a relay request, the received image information is converted into image information that can be received by the group 4 facsimile machine and then transferred. Therefore, image information transmission between the group 4 facsimile machine connected to the l5-DN and the group 3 facsimile machine connected to the PSTN can be realized without adding any functions to the group 4 facsimile machine.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a facsimile relay device (hereinafter simply referred to as a relay device) according to an embodiment of the present invention.

In the figure, a system control unit 1 executes control processing of the entire device, and a system memory 2 stores control processing programs executed by the system control unit 1 and various necessary for the control processing programs. It is used to store data such as.

The parameter memory 3 stores various information such as a number table that registers each destination information and whether the line network to which the terminal device corresponding to the destination information is connected is ISDN or PSTN. It is for remembering.

The image processing unit 4 is for performing resolution conversion processing for converting the resolution of an image and image processing for converting the reduction rate (magnification) of the image.

The image storage device 5 is for storing a large amount of image information, and the encoding/decoding units 6 and 7 encode and compress the image signal, and convert the compressed image information into the original image signal. It is for decoding.

As encoding methods, the encoding method (MH, MR) for group 3 facsimile machines and the encoding method (MMR) for group 4 facsimile machines are provided.

The group 3 facsimile transmission control unit 8 is for executing transmission control procedure processing for the group 3 facsimile machine, and the modem 9 is for performing modulation and demodulation processing of digital data so that the digital data can be transmitted using an analog line. The network control device 10 is used to connect this relay device to the PSTN, which is an analog line network. Additionally, the network foot device 10 has an automatic call/receive function.

The group 4 facsimile transmission control unit 11
The ISDN line control unit 12 is for implementing the line control process of the ISDN basic interface function, and the ISDN interface circuit 13 is for executing the transmission control procedure processing of the facsimile machine. This is for connecting this Group 4 facsimile device to ISDN.

Here, the ISDN line control unit IO is the ISDN layer 3
The ISDN interface circuit 11 realizes the line control functions of ISDN layers 1 and 2.

The system control unit 1, system memory 2, parameter memory 3, image processing unit 4, image storage device 5, encoding/decoding units 6, 7, group 3 facsimile transmission control unit 8, and group 4 facsimile transmission control unit 11 are , and are connected to a system bus 14, and information exchange between these elements is performed via this system bus 14.

In addition, Group 4 facsimile transmission control section 11, engineering SD
The N line control unit 12 and the sDN interface circuit 13 use the local bus 15 to exchange signals on the D channel (signal channel), and use the local bus 16 to exchange information on the B channel (information channel). are exchanging. Also, this local bus 15,1
6 is also connected to the system bus 14, and is connected to the ISDN
Line control section 12 and ISDN interface circuit 13
exchanges various necessary information with the system control section 1 via the local buses 15, 16 and the system bus 14.

With the above configuration, for example, as shown in FIG.
Group 3 facsimile machine FX3 connected to
Let us now consider the case where image information is transmitted to the group 4 facsimile machine FX4 connected to the ISDN.

At this time, as shown in FIG. 3, the group 3 facsimile machine FX3 calls the relay device CM, and after the relay device sends out the called station identification signal CED, A digital identification signal DIS for indicating a standard transmission function and a non-standard function identification signal NSF for indicating a non-standard transmission function including a relay function are responded to the group 3 facsimile machine FX3.

Group 3 facsimile machine FX3 has the transmission functions used to transmit the image information, such as document size, resolution (linear density), encoding method, and modem speed, including relay requests that specify group 4 facsimile machine 1FX4 as the relay destination. After notifying the relay device CM using the non-standard function setting signal NSS, the training check signal TCP is sent out at the modem speed set at that time.

If the reception result of the training check signal TCP is good, the relay device CM responds with a reception preparation confirmation signal CFR.

As a result, the group 3 facsimile machine FX3 transmits the image information PIX encoded using the encoding method set at that time.
At the same time, a procedure end signal EOP is sent to notify the end of the image information transmission.

The relay device CM stores the received image information PIX in the image storage device 5, and decodes the image information IPIX using the encoding/decoding units 6 and 7 to obtain the image information I! The receiving state of the PIX is checked, and if the receiving state of the image information PIX is good, a message confirmation signal MCF is responded.

As a result, Group 3 FAX, Simili device FX3,
A disconnection command signal DCN is sent to restore the line. Further, upon receiving the disconnection command signal DCN, the relay device restores the line and ends the group 3 facsimile transmission procedure.

In this way, the relay device C receives the relay request from the group 3 facsimile device FX3, and stores the relay image information in the image storage device 5.

Next, based on the destination information of the relay destination notified from the group 3 facsimile machine FX3 at that time, the relay table WCM refers to the number table stored in the parameter memory 3 to determine which terminal device has the destination information. However, ISDN
is a terminal device connected to the PST
It is determined whether the terminal device is connected to N.

In this case, the group 4 facsimile machine FX4 connected to ISDN is specified as the relay destination, so
The SDN line control unit 12 and the ISDN interface circuit 13 send a call setup message 5ETUP with the relay destination as the destination to the ISDN to request call setup with the destination terminal, and the ISDN is designated as the destination terminal. A call setup message S is sent to the Group 4 facsimile machine FX4.
[Send ETUP and make a call. In addition, ISDN sends a call setup acceptance message CAL to notify the call setup status.
Send LJROC to relay device CM.

When group 4 facsimile machine FX4 detects an incoming call, it sends a paging message ALERT to ISDN, and
N sends a paging message ALERT to the relay device side to notify that it has started paging the group 4 facsimile device FX4.

When group 4 facsimile machine FX4 responds to the incoming call, it sends a response message C0NN to ISDN.
sends a response message C0NN to the relay device side to notify that group 4 facsimile device FX4 has accepted the call.

Also, ISDN is a group 4 facsimile machine FX4.
The response confirmation message C0NN ACK is sent to confirm the response of group 4 facsimile machine FX4, and at that point, the relay device side and group 4 facsimile machine FX4
An information channel for data transmission is established between the two.

As a result, the group 4 facsimile transmission control procedure is started between the relay device CM and the group 4 facsimile device FX4, and the image information transmission stage is reached.

Old relay device C, image information stored in the image storage device 5,
The encoding/decoding unit 6 decodes the original image signal, and the 1-image processing unit 4 converts the image signal into an image signal with the resolution notified from the regroove 4 facsimile device FX4, and the converted image signal The encoder/decoder 7 encodes and compresses the image information into image information that can be received by the group 4 facsimile machine FX4. Then, the encoded and compressed image information is transmitted to the group 4 facsimile machine FX4.

When the data transmission is finished, the relay device sends a disconnection message DISC to the ISDN to request release of the information channel, and the l5-DN sends a disconnection message DISC to the group 4 facsimile machine FX4 to restore the information channel. Notice.

As a result, group 4 facsimile machine FX4 sends a release message REL notifying completion of channel disconnection to ISD.
In response to N, a release message REL is sent from the ISDN to the relay device CM. Relay device C sends release completion message REI, COMP when channel release is completed.
to the ISDN, thereby notifying the ISDN of the
The SDN sends a release completion message REL COMP to the group 4 facsimile machine FX4, and the information channel is released, and the information channel set between the relay device CM and the group 4 facsimile machine FX4 is completely released. Ru.

In this way, an information channel is set up between the relay device CM and the group 4 facsimile device FX4, and the relay image information stored in the image storage device 5 is transferred to the group 4 facsimile device FX4.
The image information is converted into image information that can be received by the facsimile machine FX4 and then received by the group 4 facsimile machine FX4.

Thereby, image information transmission from the group 3 facsimile machine FX3 connected to the PSTN to the group 4 facsimile machine connected to the ISDN is realized by the relay function of the relay device CM.

Conversely, image information is transmitted from the group 4 facsimile machine FX4 connected to the ISDN to the group 3 facsimile machine FX3 connected to the PSTN in the following manner.

That is, as shown in FIG. 4, the group 4 facsimile machine FX4 sends a call setup message 5ETUP with the relay table @CM as the destination to the ISDN to request call setup with the destination terminal, and the ISDN: A call is made by sending a call setup message 5ETUP to the relay device CM designated as the destination terminal. The ISDN also sends a call setup acceptance message CALLJROC to the group 4 facsimile machine FX4 to notify the call setup status.

When the old relay device C detects an incoming call, it sends a paging message ALERT to the ISDN, and the ISDN sends a paging message A.
LERT is sent to group 4 facsimile machine FX4 to notify that the relay device CM has started calling.

When the relay device CM responds to one incoming call, it sends a response message C0N.
N to ISDN, and ISDN responds with message C0.
NN is sent to group 4 facsimile machine FX4 to notify that relay device CM has accepted the call.

In addition, ISDN sends a response confirmation message C to the relay device side.
Send 0NNJCK and check the response of relay bag MCM,
At that point, an information channel for data transmission is established between the relay device and group 4 facsimile machine FX4.

As a result, a group 4 facsimile transmission control procedure is started between relay device CM and group 4 facsimile device FX4, and group 4 facsimile device FX4 selects group 3 facsimile device FX3 as the relay destination when starting the session. Notify the relay device CM of the specified relay request.

Then, the group 4 facsimile machine FX4 transmits the image information to the relay device CM, and the relay device CM stores the received image information in the image storage device 5.

When the data transmission is finished, the group 4 facsimile device FX4 sends a disconnection message DISC to the engineering SDN to request release of the information channel, and the ISDN sends a disconnection message DISC to the relay device CM to request recovery of the information channel. Notice.

As a result, when the relay device side responds to the ISDN with a release message REL notifying completion of channel disconnection, the ISD
A release message REL is sent from N to group 4 facsimile machine FX4. When the group 4 facsimile device FX4 completes channel release, it sends a release completion message REL COMP to notify that fact, and ISDN then sends a release completion message REL
-COMP is sent to the relay device side, the information channel is released, and the information channel set between the relay device side and the group 4 facsimile machine FX4 is completely released.

In this way, the relay device C receives the relay request from the group 4 facsimile device FX4, and stores the relay image information in the image storage device 5.

Next, the relay device CM refers to the number table stored in the parameter memory 3 based on the destination information of the relay destination notified from the group 4 facsimile device FX4 at that time, and selects the terminal device having the destination information. However, ISDN
is a terminal device connected to the PST
It is determined whether the terminal device is connected to N.

In this case, since the group 3 facsimile machine FX3 connected to the PSTN is specified as the relay destination, the relay device CMI± and the network control device 10 send a selection signal for the destination information of the group 3 facsimile machine FX3 to the PSTN. and calls group 3 facsimile machine FX3.

As a result, when the group 3 facsimile machine FX3 detects an incoming call, it sends the called station identification signal CED, and then
It responds to the relay device CM with a digital identification signal DIS for displaying the standard transmission function equipped on its own terminal, and a non-standard function identification signal NSF for displaying the non-standard transmission function.

As a result, relay device C notifies group 3 facsimile device FX3 of the transmission functions used for image information transmission, such as document size, resolution (linear density), encoding method, and modem speed, using digital command signal DO8. Then, the training check signal TCP is sent out at the modem speed set at that time.

If the group 3 facsimile machine FX3 receives the training check signal TCP successfully, it responds with a reception preparation confirmation signal CFR.

Thereby, the relay device CM once decodes the image information stored in the image storage device 5 into the original image signal by the encoding/decoding unit 6, and then converts the image signal into the original image signal by the image processing unit 4. The converted image signal is converted into an image signal with a set resolution, and the encoded and compressed image signal is encoded and compressed by the encoding method set at that time by the encoder/decoder 7, and the encoded and compressed image information PIX is The data is transmitted to group 3 facsimile machine FX3 at the transmission speed set at that time. When the transmission of the image information PIX is finished, a procedure end signal EOP is sent to notify the end of the image information transmission.

If the reception status of the image information PIX is good, the group 3 facsimile machine FX3 sends a message confirmation signal MCF.
respond.

As a result, the relay device CM sends out a disconnection command signal DCN to restore the line. Furthermore, upon receiving the disconnection command signal DCN, the group 3 facsimile machine FX3 restores the line and ends the group 3 facsimile transmission procedure.

In this way, the relay device CM transfers the image information stored in the first image storage device 5 to the group 3 facsimile device FX.
3 is converted into image information that can be received by Group 3 facsimile machine 1FX3.

Thereby, image information transmission from the group 4 facsimile device connected to the ISDN to the group 3 facsimile device ftFX3 connected to the PSTN is realized by the relay function of the relay device CM.

As described above, the function of the relay device CM makes it possible to transmit image information between the group 3 facsimile machine FX3 and the group 4 facsimile machine FX4.

Figure 5 shows the relay device CM when a call is made from the PSTN.
An example of processing is shown.

When a call is made from the PSTN and the network control device 10 detects the call, the network control device 10 connects the PSTN line (101), and sends a called station identification signal CED, a digital identification signal DIS, and a non-standard function identification signal NSF. (processing 102).

As a result, it is checked whether a non-standard function setting signal NSS including a relay request has been sent from the other device (determination 1).
03), when the result of judgment 103 is YES,
Check whether the relay destination was recognized (decision 104)
.

When the result of the judgment 104 is YES, the relay destination number is memorized (step 105), and based on the stored relay destination number, the contents of the number table stored in the parameter memory 3 are referred to and the relay destination number is stored. is a Group 4 facsimile machine connected to the IS'DN (decision 106).

When the result of the judgment 106 is YES, processing is performed to store the transmission mode such as the encoding method set by the non-standard function setting signal NSS 107), processing is performed to receive the image information transmitted from the partner device 108), The received image information is stored in the image storage device 5 (process 109), and processes 108 and 109 are repeatedly executed until the communication is completed (judgment 1) 0
No loop).

If the result of the judgment 110 is YES, the line is restored (111), and the image information stored in the image storage device 5 is
The image information is converted into image information that can be received by the group 4 facsimile machine (processing 112).

Then, a call is made to the relay destination specified at that time using 1SDN (113), and a predetermined ISDN call setting procedure (
Process 114) is executed to set up an information channel with the other party's device, and a predetermined group 4 facsimile transmission procedure is executed (process 115).

Then, the image information stored in the single image storage device 5 is transmitted to the partner device (process 116), and when the transmission is completed, a predetermined ISDN termination procedure is executed (process 117).

This allows a Group 3 facsimile machine connected to the PSTN to a Group 4 facsimile machine connected to the ISDN.
Image information is transmitted to the facsimile device.

Also, if the relay destination specified at that time is that of a group 3 facsimile device connected to the PSTN and the result of judgment 106 is NO, then the The received image information is stored in the image storage device 5 (process 119), and the received image information is stored in the image storage device 5 (process 120), until the communication ends. Processes 11.9 and 120 are repeatedly executed (No loop of judgment 121).

If the result of the judgment 121 is YES, the line is temporarily restored (process 122), and the network control device 10 makes a call to the relay destination specified at that time (process 123).

Then, when the other party's device responds to the incoming call, the predetermined group 3
The facsimile transmission pre-transmission procedure is executed (step 124), and the transmission mode of the other party's device is confirmed.

Then, the image information stored in the image information storage device 5 is converted into image information that can be received by the partner device (process 125), and the converted image information is transmitted (process 126).

When processing 126 is completed, the transmission of image information to the relay destination is completed, so the line is restored (process 127).

In this way, group 3 connected to the PSTN
A relay operation to the facsimile machine is performed.

Also, when you answer an incoming call, the other device does not notify you of a relay request and the result of step 03 is NO, and even though it has notified you of a relay request, it cannot recognize the relay destination and makes a decision. When the result of step 104 is NO, the procedure interrupt signal PIS is responded to (step 128), the line is restored (step 129), and the image information transmission is rejected.

In this way, relay device CMl receives image information from group 3 facsimile devices connected to the PSTN.
It is relayed to a Group 4 facsimile machine connected to the ISDN or a Group 3 facsimile machine connected to the PSTN.

FIG. 6 shows an example of processing when a call is made from ISDN.

When a call is made from ISDN, a predetermined ISDN call setting procedure is executed (process 201), and when an information channel is established with the other party's device, a predetermined group 4 facsimile transmission procedure is executed (process 202).

At this time, it is checked whether the partner device notified a relay request specifying a relay destination at the time of starting the session (decision 203).1 If the result of determination 203 is YES, the relay destination number notified at that time is checked. Based on the number table stored in the parameter memory 3, the group 3 whose relay destination is connected to the PSTN is selected based on the number table stored in the parameter memory 3.
Check whether it is a facsimile device (decision 204)
).

When the result of the judgment 204 is YES, the relay destination is memorized (process 205), the image information is received according to the group 4 facsimile transmission procedure (process 206), and the received image information is stored in the image storage device 5 (process 20
7).

When the image information reception is finished, a predetermined SDN termination procedure is performed (process 208), and the image information transmission with the relay requesting partner device is finished.

Next, the relay destination specified at that time is transferred to the network controller 1.
When the other party's device responds to the incoming call, a predetermined group 3 facsimile transmission pre-transmission procedure is executed (210), and the transmission mode of the other party's device is confirmed.

Then, the image information stored in the image information storage device 5 is converted into image information that can be received by the partner device (process 211), and the converted image information is transmitted (process 212).

When the process 126 is completed, the transmission of the image information to the relay destination is completed, so the line is restored (process 213).

As a result, image information can be transmitted from the group 4 facsimile machine connected to the ISDN to the group 3 facsimile machine connected to the PSTN.

Further, if the relay destination specified at that time is a group 4 facsimile device connected to the ISDN and the result of the judgment 204 is NO, the relay destination is stored (step 214), and the group 4 facsimile transmission procedure is performed. Accordingly, the image information is received (process 215), and the received image information is stored in the image storage device 5 (process 216).

When the reception of the image information is completed, a predetermined ISDN termination procedure is performed (process 217), and the image information transmission with the partner device of the relay request is terminated.

Next, a call is made to the relay destination specified at that time via ISDN (process 218), a predetermined ISDN call setting procedure (process 219) is executed to set up an information channel with the other party's device, and a predetermined group 4 facsimile transmission is performed. Perform the steps (
Processing 220).

Then, when the image information stored in the image storage device 5 is transmitted to the other device (221), and the transmission is completed,
A predetermined ISDN termination procedure is executed (process 222).

In this way, group 4 connected to ISDN
A relay operation to the facsimile machine is performed.

Furthermore, when the other party's device does not notify the relay request when a call is first received and the result of the judgment 203 is NO, at that point, the communication rejecting procedure signal is responsively processed 223), and the specified ISDN Execute the termination procedure (processing 2
24), this process ends.

In this way, the relay device CM transfers image information from the group 4 facsimile device connected to the ISDN to the
a group 3 facsimile machine connected to the STN;
Alternatively, it is relayed to a Group 4 facsimile machine connected to ISDN.

Note that the timing for converting the relay image information stored in the image storage device 5 into content corresponding to the transmission mode of the relay destination may be performed after negotiation of the transmission mode with the relay destination.

Furthermore, in the above explanation, if the relay destination is busy, the call is made again after a certain period of time has elapsed.

[Effects of the Invention] As explained above, according to the present invention, an image compatible with an ISDN communication function, a group 4 facsimile device function, a PSTN (analog line network) communication function, a group 3 facsimile device function, and a group 4 facsimile device is provided. It has an image information conversion function that mutually converts information and image information compatible with Group 3 facsimile devices, an image information storage function, and a function that determines the type of line network to which the terminal device is connected based on destination information. In preparation, when a call is made from a Group 4 facsimile machine and a relay request is notified, the image information received at that time is stored, and after the reception is completed, the relay destination is connected based on the notified relay destination information. When the line network is determined and the relay destination is connected to the industrial SDN, the relay destination is called using ISDN and the stored image information is sent, and the relay destination is connected to the analog line network. If it is determined that the relay destination is receiving a call, it calls the relay destination over the analog line network, converts the accumulated image information into image information that the relay destination can receive based on the encoding method notified at that time, and then calls the relay destination after the conversion. image information to the relay destination. Also, when a group 3 facsimile machine makes a call and is notified of a relay request, the image information received at that time is stored,
After the reception is completed, the line network to which the relay destination is connected is determined based on the notified relay destination information, and the relay destination is
When it is determined that it is connected to SDN, TSDN
calls the relay destination, converts the stored image information into image information that the relay destination can receive, sends the converted image information, and determines that the relay destination is connected to an analog line network. When this occurs, a call is made to the relay destination over the analog line network, the accumulated image information is converted to image information that the relay destination can receive based on the encoding method notified at that time, and the converted image information is sent to the relay destination. I am trying to send it to a relay destination.

Therefore, from a Group 4 facsimile machine connected to the ISDN to a Group 3 facsimile machine connected to the PSTN.
When a relay request is received to a facsimile machine, the received image information is converted into image information that can be received by the Group 3 facsimile machine and then transferred. When receiving a relay request to Tomoe, the received image information is converted to image information that can be received by the Group 4 facsimile device and transferred, so the Group 4 facsimile device connected to the ISDN and the PSTN are connected. Image information transmission between group 3 facsimile machines is
The advantage is that this can be realized without adding any functions to the Group 4 facsimile machine.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a facsimile relay device according to an embodiment of the present invention, FIG. 2 is a schematic diagram for explaining the relay operation of the relay device, and FIG. 3 is a group 3 facsimile connected to the PSTN. A time chart for explaining the relay operation from the device to the Group 4 facsimile device connected to the ISDN, Figure 4 shows the relay operation from the Group 4 facsimile device connected to the ISDN to the Group 3 facsimile device connected to the PSTN. FIG. 5 is a flowchart showing an example of processing when the PSTN detects an incoming call; FIG.
The figure is a flowchart showing an example of processing when ISDN detects an incoming call. 1... System control unit, 2... System memory, 3
...Parameter memory, 4...Image processing section, 5...
・Image storage device, 6, 7...encoding/decoding unit, 8...
- Group 3 facsimile transmission control unit, 9...Modem, 10...Network control device, 11...Group 4 facsimile transmission control unit, 12...ISDN line control unit, 1
3...ISDN interface circuit. K! A +4th E8M (Fig.

Claims (1)

[Scope of Claims] ISDN line control means for transmitting data via ISDN; analog line control means for transmitting data via an analog line network;
Group 4 facsimile transmission control means for transmitting image information with a Group 4 facsimile machine using an analog line network; Group 3 facsimile transmission control means for transmitting image information with a Group 3 facsimile machine using an analog line network; an image information storage means, an image information conversion means for mutually converting image information compatible with Group 4 facsimile devices and image information compatible with Group 3 facsimile devices, and a line to which destination information of the notified relay destination is connected. Line network determination means for determining the network, and when the group 4 facsimile machine makes a call and notifies the relay request, the image information received at that time is stored in the image information storage means, and after the reception is completed, the image information is notified. The line network to which the destination is connected is determined based on the destination information, and when it is determined that the destination is connected to ISDN, the ISDN line control means calls the destination and the image information is stored in the image information storage means. On the other hand, when it is determined that the relay destination is connected to an analog line network, the analog line network control means calls the destination, and based on the encoding method notified at that time, a first relay control means for converting the image information stored in the image information storage means into image information receivable by the destination by the image information converting means and transmitting the converted image information to the relay destination; When the device makes a call and is notified of a relay request, the image information received at that time is stored in the image information storage means, and after the reception is completed, the line network to which the destination is connected is determined based on the notified destination information. When it is determined that the destination is connected to ISDN, the ISDN line control means calls the destination, and the image information conversion means transfers the image information stored in the image information storage means to the destination. While converting the image information into receivable image information and transmitting the converted image information, when it is determined that the relay destination is connected to an analog line network, the analog line network control means calls the destination and sends a call to the destination. Based on the encoding method notified at the time, the image information conversion means converts the image information accumulated in the image information storage means into image information that can be received by the destination, and transmits the converted image information to the relay destination. A facsimile relay device comprising a second relay control means for controlling the facsimile.