JP3478787B2 - Facsimile system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile system, and more particularly to a group IV facsimile machine and a group II facsimile machine.
The present invention relates to a facsimile system in which a facsimile machine and a facsimile server machine coexist to mutually perform facsimile transmission / reception.

[0002]

2. Description of the Related Art G across a PSTN network and an ISDN network
In a conventional facsimile network system capable of transmitting and receiving G4 facsimile and G3 facsimile, Security protection of communication between a facsimile server device (hereinafter referred to as a server) and each terminal (facsimile device itself), B. Facsimile transmission fallback operation (G4
Mode to G3 mode), C.I. Setting the communication mode of the protocol conversion device for connecting the G4 mode facsimile device to the PSTN network, and D. PSTN network and ISD
The network adapter device that connects to the N network is PST
The communication mode setting when receiving information from the N network has been performed as follows.

A. Security protection in communication between server and facsimile device The ID (password) assigned to the user is registered in the server in advance, and the ID information sent from the user (facsimile device) at the time of actual communication is used as the information registered in the server. By comparison, it was configured to prevent unauthorized use by unregistered persons.

B. Fallback operation of facsimile transmission IS when the facsimile machine on the transmission side makes a call to the ISDN network in G4 mode (SETUP message transmission)
If the disconnect code from the DN network (code that conforms to the CCITT-recommended Q series) is recognized, if the facsimile machine satisfies a predetermined fallback condition, ISDN
The port was configured to make a call in G3 mode.

C. G4 mode facsimile machine PST
Communication Mode Setting of Protocol Conversion Device Connected to N Network The protocol conversion device changed the communication mode according to the destination terminal as follows. (1) The communication mode is designated from the facsimile machine on the transmitting side during communication. (2) The logical address and terminal type of the destination terminal are registered in advance in the protocol conversion device, and the communication mode is changed according to the address. (3) During communication, manually set the communication mode of the protocol converter.

D. Communication mode setting of a network adapter device connecting the PSTN network and the ISDN network when receiving facsimile data from the PSTN network. When the facsimile data is received from the PSTN network, the network adapter device sets the communication mode as follows. (1) The communication mode is fixed for each individual device (that is, the communication partner is fixed). In other words, the center side port (PSTN number of the network adapter) is designated by the sending side facsimile device. (2) After the line is connected, the communication mode is designated to the network adapter device by the DTMF signal.

[0007]

However, the above-mentioned conventional example has the following problems.

[0008]

Fallback operation of facsimile transmission Facsimile transmission in G3 mode (communication speed:
〜14.4 kbps) or G4 mode facsimile transmission, it occupies one Bch (communication speed: 64 kbps) line of the ISDN network, and thus has the drawback of lowering line efficiency. there were.

[0010]

[0011]

The present invention has been made in view of the above conventional example, and an object of the present invention is to provide a facsimile network system capable of performing fallback operation with good line efficiency.

[0013]

[0014]

In order to achieve the above object, a facsimile system of the present invention has the following configuration. That is, in a facsimile system that includes a facsimile server device, a gateway device, and a network adapter device and is connected to an integrated digital communication network (ISDN) and a public telephone network (PSTN) to transmit and receive facsimile data, the facsimile server device is:
A means for confirming the transmission destination of the facsimile data and the type of the transmission destination device from the information stored in the document management table and the terminal registration table; and, as a result of the confirmation, registration of the transmission destination of the facsimile data in the terminal registration table. If it is determined that there is, a means for controlling the facsimile data to be transmitted to the transmission destination via the gateway device or the network adapter device according to the type of the confirmed transmission partner device, and the confirmation result. , Means for controlling the gateway device to make a call to the second type facsimile device connected to the ISDN when it is determined that the destination of the facsimile data is not registered in the terminal registration table If the call setup is successful as a result of the call, the Means for controlling to transmit the facsimile data from the way device, the call results,
When the call setting is disconnected from the network or the end terminal, a means for comparing the disconnection cause and the operation condition stored in the parameter registration table in which the operation for the disconnection cause is specified, and from the comparison, When it is determined that the operation for the disconnection cause is the fallback operation from the transmission operation in the second format to the transmission operation in the first format, the facsimile data is transmitted via the network adapter device. Means for controlling transmission to a facsimile machine of the first type connected to the PSTN, and a facsimile system.

[0015]

[0016]

[0017]

[0018]

[0019]

According to the present invention, when it is judged that the transmission destination of the facsimile data is not registered, the gateway device makes a call to the second type facsimile device connected to the ISDN, When the call setup is successful as a result of the call, the gateway device is controlled to send the facsimile data, while when the call setup is disconnected from the network or the end terminal, the disconnection cause and the parameter registration table are stored. If it is determined from the comparison that the operation for the disconnection cause is the fallback operation from the transmission operation in the second format to the transmission operation in the first format, Fax data via network adapter device to PSTN
The facsimile machine of the first type connected to is controlled to transmit.

[0020]

[0021]

[0022]

[0023]

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[Schematic Description of System (FIG. 1)] FIG. 1 is a system configuration diagram of a facsimile network system as a typical embodiment of the present invention. In FIG. 1, 1a
~ 1d is CCITT X. 25 compatible G4 facsimile apparatus, 2a and 2b ISDN compatible G4 facsimile apparatus, 3a and 3b G3 facsimile apparatus, 4a and 4b automatic dial apparatus (PAD) connected between the G3 facsimile apparatus and the PSTN network, 5a and 5b are X. This is a protocol conversion device (PC1) that connects a 25 compatible G4 facsimile device to the PSTN network and enables mutual communication with the G3 facsimile device.

Further, 6a and 6b are automatic dialing devices (IADs) connected between the ISDN compatible G4 facsimile machine and the ISDN network, and 7a and 7b are PSTN network and PSD.
The network adapter device (PC2), 8a, 8b, which connects the N network and performs address conversion between them and protocol conversion between G3 facsimile and G4 facsimile, is an IS.
A gateway device (PC3) that connects the DN network and the PSDN network and performs address conversion between the two, 9a to 9c are small packet switches (RU), 10a and 10b are large packet switches (CPS), and 11a and 11b are Facsimile server device (FS: hereinafter referred to as server), 12 is a network management device (NC) that performs overall management and billing
C) and 13 are PSTN networks, and 14 is an ISDN network.

[Explanation of each component of the system (FIGS. 2 to 1
2)] FIG. 2 is a block diagram showing a detailed configuration of the PSTN automatic dial devices (PAD) 4a, 4b shown in FIG. In FIG. 2, 201 is an I / F unit for a terminal (here, a G3 facsimile apparatus), and 202 is a connected G
A DC loop detection unit for monitoring the ON / OFF hook state of the 3 facsimile machines, 203 a power supply circuit, 204 a signal generation unit for generating a call progress tone such as busy tone, 205a and 205b a line switching circuit, 206 a G3 facsimile D for decoding the selection signal from the device
TMF signal detector, 207 DTMF signal (PB) generator, 208 selection signal (DP) generator, 209 DTM
A transmission signal switching circuit between the F signal (PB) generating unit 207 and the selection signal (DP) generating unit 208, and 210 is a telephone network (PST).
N) and an I / F part, 211 is a call progress signal detecting part for recognizing a call progress tone from the network,
212 is a DC loop forming circuit, 213 is a polarity detecting circuit,
Reference numeral 214 is a table for registering various conversion information, 215 is a switch for setting an operation mode, line type, etc., 216 is a CPU, 217 is a memory, and 218 is a timer.

FIG. 3 is a block diagram showing the detailed structure of the ISDN automatic dialing devices (IADs) 6a and 6b shown in FIG. In FIG. 3, 301 is a terminal (ISDN
I / F unit with a compatible G4 facsimile apparatus, 302 is a power supply circuit, 303 is a memory, 304 is a CPU, 305 is a table for registering various conversion information, 306 is a display unit for displaying the operating state / line state, and 307 is The ISDN (Basic Rate) I / F section.

FIG. 4 is a block diagram showing the detailed structure of the protocol converters (PC1) 5a and 5b shown in FIG. In FIG. 4, 401 is a terminal (G.4 compatible with X.25.
I / F section (X.25 control section) with a facsimile machine),
Reference numeral 402 denotes an RS23 for connecting a terminal for setting parameters and the like.
2C interface (I / F) port, 403 is a display section showing an operation state, 404 is a switch for setting various operation modes, 405 is a memory, 406 is a registration table of various parameters, and 407 is address conversion information. A table, 408 is an encoder / decoder that performs image data conversion in G4 mode (MMR) / G3 mode (MH / MR), 409 is a counter, 410 is a timer, 411 is a CPU that performs overall control, and 412 is a selection signal (DP). / P
B) generator 413, tone signal generator 414, modem 415, call progress signal detector 415 for recognizing call progress tone from PSTN network, 41
6 is a DC loop forming circuit, 417 is a detection unit for detecting the polarity of the local line, 418 is an I / F unit with the PSTN, 41
Reference numeral 9 is a register for storing the number element of the selection signal transmitted to the PSTN network.

FIG. 5 is a block diagram showing a detailed configuration of the gateway devices (PC3) 8a, 8b shown in FIG. In FIG. 5, 501 is an ISDN (basic rate) I / F section, and 502 is a PSDN (X.25) I / F.
Section, 503 is a memory, and 504 is a CP that controls the entire system.
U, 505 is a registration table of various parameters, 506 is a counter, 507 is a timer, 508 is a table for registering address translation information, 509 is a display section showing an operating state,
Reference numeral 510 is a switch for setting various operation modes, and 511 is a management table for recording communication results, data amount, etc.
Is an RS232C interface (I / F) port for connecting a terminal for setting parameters and the like.

FIG. 6 is a block diagram showing a detailed configuration of the network adapter devices (PC2) 7a, 7b shown in FIG. In FIG. 6, 601 is PSDN (X.2.
5) I / F unit, 602 is an RS232C interface (I / F) port for connecting a terminal for setting parameters and the like,
Reference numeral 603 is a display unit showing an operating state, 604 is a switch for setting various operation modes, 605 is a memory, 606 is a table for recording communication results / data amount, etc., 607 is a table for registering address conversion information, and 608 is various Parameter registration table, 609 counter, 610 timer, 611 G4 mode (MMR) / G3 mode (MH)
An encoder / decoder for converting (MR) image data, 612 is a selection signal (DP / PB) generation circuit, 61
3 is a tone signal generating circuit, and 614 is C for controlling the whole.
PU, 615 is a modem, 616 is a call progress signal detecting section for recognizing a call progress tone from the PSTN network, 617 is a DC loop forming circuit, 618 is a detecting section for detecting the polarity of the office line, and 619 is DTMF. The signal detection unit 620 is an I / F unit with the PSTN, and 6
Reference numeral 21 is a register for storing the number element of the selection signal transmitted to the PSTN network.

FIG. 7 is a block diagram showing a detailed configuration of the facsimile server devices (FS) 11a, 11b shown in FIG. In FIG. 7, 701 is PSDN (X.2).
5) I / F unit, 702 is a communication control unit (CCU) that performs communication according to the G4 procedure, and 703 is a CP that performs overall control
U, 704 is a memory, 705 is a received document management table, 706 is a management table for recording communication results / data amount, etc., 707 is a counter, 708 is a timer, 70
Reference numeral 9 is an encoder / decoder that encodes / decodes MMR data when converting paper size, resolution, etc.
Reference numeral 710 is a table for registering terminal attributes and the like, 711 is a registration table for various parameters, 712 is a table for registering address conversion information, and 713 is an I / F with various input / output (I / O) devices such as a display / keyboard. Part, 71
Reference numeral 4 denotes a local area network (LAN) I / F unit.

FIG. 8 is a diagram showing the internal structure of the registration table 214 of the PSTN automatic dial devices 4a and 4b shown in FIG. 2 and the registration table 305 of the ISDN automatic dial devices 6a and 6b shown in FIG. .

FIG. 9 is a diagram showing a sequence at the time of communication between the PSTN automatic dial devices (PAD) 4a, 4b and the network adapter devices (PC2) 7a, 7b shown in FIG.

FIG. 10 shows the ISDN automatic dial devices (IAD) 6a and 6b and the gateway device (P) shown in FIG.
FIG. 8 is a diagram showing a sequence at the time of communication of C3) 8a and 8b.

FIG. 11 shows an ISDN automatic dial device (I
AD) Transmission S when 6a and 6b execute address translation
It is a figure which shows the format of an ETUP message.

FIG. 12 shows the address conversion table 407 of the protocol conversion device (PC1) 5a, 5b shown in FIG. 4 and the network adapter device (PC2) 7 shown in FIG.
It is a figure which shows the internal structure of the address conversion table 607 of a, 7b.

[Explanation of operation of each constituent device (FIGS. 13 to 2)
1)] Next, the operation of each component of the facsimile network system having the above configuration will be described with reference to the flowcharts shown in FIGS.

(1) Automatic dial device 4a for PSTN,
4b (PAD) operation description Here, the operation at the time of data transmission from the G3 facsimile apparatuses 3a and 3b will be described with reference to the flowcharts shown in FIGS.

First, in step S101, the terminal side I / F
G3 facsimile machines 3a and 3b connected to the unit 201
If the DC loop detection unit 202 detects the off-hook, the process proceeds to step S102, the power feeding circuit 203 supplies power to the G3 facsimile apparatuses 3a and 3b, and the call progress signal generation unit 204 generates a dial tone. This is the G3 facsimile machine 3a, 3b
To the selection signal waiting state.

In step S103, the process checks whether or not the selection signal (PB) is received within a fixed time.
If the selection signal (PB) is not sent here, the process proceeds to step S104, where the call progress signal generation unit 204 generates a howler sound and sends it to the G3 facsimile apparatuses 3a and 3b, and the DC loop. Encourage the liberation of. On the other hand, if the selection signal is received from the G3 facsimile machines 3a and 3b within the fixed time, the process proceeds to step S105 to refer to the registration table 214 to identify the received selection signal.

Then, in step S106, step S
It is checked whether or not the escape code (ESC) registered in the table exists in the selection signal identified by 105. Here, if the ESC does not exist, the process proceeds to step S107, and the switch 215 is referred to, and the G3 facsimile apparatuses 3a and 3 are selected by the selection signal corresponding to the line type.
The number received from b is sent to the PSTN network 13 as it is, and in step S108 the switching circuits 205a, 205
05b PSTN line and G3 facsimile machine 3
Directly connect a and 3b.

On the other hand, if the ESC is present, the process proceeds to step S109 to check the line type by referring to the switch 215. Then, the process is step S110.
At, it is checked whether the line is a PB line. If the line is a PB line, the process sends the network address (NTA) corresponding to the ESC received in the selection signal in step S111 to the PSTN network via the PB line, and if the line is a DP line, the process proceeds. In step S112, the network address (NTA) corresponding to the ESC received by the selection signal is sent to the PSTN network via the DP line.

After the transmission of the selection signal is completed, the step S is continued.
At 113, the signal (call progress tone) returned from the network is recognized by the call progress signal detection unit 211, and it is checked whether or not the other party is busy. If it is determined that the user is busy, the process proceeds to step S114,
The call progress signal generator 204 generates a busy tone and sends it to the G3 facsimile machines 3a and 3b.

On the other hand, if it is determined that the user is not busy, the process proceeds to step S115 to establish a line connection.
In step S116 after the line connection is completed, it is checked whether or not the third tone signal (Confir-mation Tone) transmitted by the network adapter devices (PC2) 7a, 7b has been received within a fixed time. If the third tone signal is received, the process refers to the registration table 214 in step S117, and the user ID (SAN: with check bit) corresponding to the ESC received from the G3 facsimile apparatus 3a, 3b, the service The identifier (SID) is transmitted as a DTMF signal. Thereafter, in step S108, the line is switched and the G3 facsimile apparatuses 3a and 3b are directly connected to the PSTN line. On the other hand, if the third tone signal is not received within a fixed time after the line connection is completed, the process proceeds to step S108 as it is, and the line is switched to directly connect the G3 facsimile apparatuses 3a and 3b to the PSTN line.

Finally, in step S118, after the G3 facsimile apparatuses 3a and 3b are directly connected to the PSTN line, an on-hook waiting state is established due to the end of communication.

(2) Protocol conversion devices 5a, 5b (P
Explanation of Operation of C1) Here, the operation at the time of data transmission from the G4 facsimile apparatus 1c, 1d will be described with reference to the flowcharts shown in FIGS.

First, in step S201, the terminal side I / F unit 4
01 connected to X.01. 25 compatible G4 facsimile machine 1
When the CR packet is received from c and d, the process proceeds to step S202, the destination address (DA) in the received CR packet is checked, and the address conversion table 40
See 7.

The address conversion table 407 has a structure as shown in FIG. 12. In step S203, it is checked whether the DA number element of the received CR packet is registered in the incoming address of the table. If the DA number element is registered here, the process advances to step S204 to store the corresponding telephone number in the register 419. On the other hand, if the DA number element is not registered in the table 407, the process proceeds to step S205, and the DA number is directly stored in the register 4
It is stored in 19.

Next, in step S206, the switch 404
Confirm the line type from step S207.
Then, it is checked whether the line is a PB line. If the line is a PB line, the process is step S208.
Then, the number of the register 419 is sent as a selection signal to the PSTN network 13 by the DTMF signal. On the other hand, if the line is a DP line, the process proceeds to step S209, and the number of the register 419 is sent to the PSTN network 13 as a selection signal by the DP signal.

After the transmission of the selection signal is completed, step S210
Then, the call progress signal detection unit 415 and the polarity detection unit 417 monitor the connection state to check whether the line connection is completed. Here, if it is determined that the line connection has failed, the process proceeds to step S211, the cause of the failure is set in the disconnection cause column of the CI packet, and the G4 facsimile apparatuses 1c and 1d are transmitted, and the call is disconnected. To do. On the other hand, if it is determined that the line connection is completed, the process proceeds to step S212, and the network adapter device (P
C2) Waits for an answer tone signal from 7a, 7b or the same type of protocol converter (PC1).

Now, in step S213, it is checked whether or not an answer tone signal is received within a fixed time. Here, if the answer tone signal is received, the process proceeds to step S214 to send the answer back tone signal, and in step S215, the operation in the G4 mode (G4 communication is modulated and transmitted by the modem) is started. .

On the other hand, if the answer signal has not been received within the fixed time, the process proceeds to step S216 to further check whether or not the DIS, which is the signal of the G3 procedure, has been received. Here, when the DIS signal is received, the process proceeds to step S217, and G3 / G
The operation of 4 conversion mode (protocol conversion MH / MR ← → MMR conversion, etc.) is started. On the other hand, if no DIS signal is received and a signal other than the DIS signal is received, or if no signal is received, the other party is considered as an incommunicable terminal, and the process proceeds to step S218, and the G4 facsimile is performed. The call to the devices 1c and 1d is disconnected.

(3) Network adapter devices 7a, 7
Description of Operation of b (PC2) Here, the operation at the time of receiving data from the PSTN network 13 will be described with reference to the flowchart shown in FIG.

First, in step S301, the PSTN network 13 is
The call signal from the call progress signal detector 61
If detected in step 6, a DC loop forming circuit 617 forms a DC loop, and in step S302, a TONE signal generator 613 generates a confirmation tone (Conf.Tone) and transmits it to the PSTN network 13. After the completion of the transmission of the confirmation tone (Conf.Tone), the process activates the timer 610 in step S303 and waits for the DTMF signal.

Here, if the DTMF signal is not received within the fixed time, the process proceeds to step S304 and the TONE signal generating section 613 generates an answer tone to generate the PSTN network 13.
The timer 610 is restarted in step S305, and a state of waiting for an answer back tone signal is entered. Here, when the answer back tone signal is received within a certain period of time, the partner device receives the protocol conversion device (PC1) 5
Judged as a G4 facsimile machine connected to a and 5b,
The process proceeds to step S306 to enter the bridge (G4) mode operation state.

On the other hand, in step S303,
When the DTMF signal is received within the fixed time, the process proceeds to step S307, and the number element is confirmed by the check digit of the received DTMF signal. Subsequently, in step S308, if it is determined that the number element is correct, it is determined that the partner device is the G3 facsimile device connected to the PSTN automatic dialing devices (PAD) 4a and 4b, and the process proceeds to step S309, where G3 / The G4 conversion mode is activated.

If no answer back tone signal is received within a fixed time in step S305, no signal is received, or if a signal other than the answer back tone signal is received, it is received in step S308. D
If it is determined that the number element of the TMF signal is invalid (a missing element, an error, etc. is detected in the element), the process proceeds to step S3.
The flow advances to step 10 to open the DC loop to disconnect communication, and in step S311, this communication record is recorded in the communication management table 606.

(4) Protocol conversion devices 5a, 5b (P
Explanation of Operation of C1) Here, the operation at the time of receiving data from the PSTN network 13 will be described with reference to the flowchart shown in FIG.

First, in step S401, the PSTN network 1
The full-progress signal detector 41 receives the call signal from
If detected in 5, the DC loop forming circuit 416 forms a DC loop, and in step S402, the TONE signal generator 413 generates an answer tone and transmits it to the PSTN network 13. Then, in step S403, the timer 4
10 is activated, and a state of waiting for an answer back tone is received.

When an answer back tone signal is received within a fixed time in step S403, the partner machine is a G4 facsimile machine connected to the protocol converter (PC1) or a network adapter (PC).
2) If it is determined to be 7a or 7b, the process proceeds to step S408 to enter the G4 mode operation state.

On the other hand, when the answer back tone signal is not received within the fixed time, the process is step S404.
Proceed to and send DIS, which is the tonal signal for the G3 procedure,
Further, in step S405, the timer 409 is restarted to enter the signal reception waiting state of the G3 procedure.

In step S405, if the signal of the normal G3 procedure is received within the fixed time, the partner machine receives G3.
The facsimile apparatus is determined, and the process advances to step S406 to enter the G3 / G4 conversion mode operation state. On the other hand, if the reception of the signal of the regular G3 procedure is not received within a certain time or if no signal is received, the partner machine determines that it is a device that cannot communicate, and the process proceeds to step S407 and DC Open the loop and disconnect the communication.

(5) Network adapter devices 7a, 7
Description of Operation of b (PC2) Here, the operation of performing data transmission to the PSTN network 13 will be described with reference to the flowcharts shown in FIGS.

First, in step S501, PSDN (X.2
5) If the reception of the CR packet is detected at the port, then the destination address (DA) of the CR packet received in step S502 and the address conversion table 607.
Compare the incoming address registered in. As a result, if there is a matching number element in the process of step S503, the process proceeds to step S504, and the telephone number corresponding to the incoming address of the table 607 is stored in the register 621. On the other hand, when there is no matching number element, the process proceeds to step S505, and the DA number of the received CR packet is stored in the register 621 as it is.

After storing the number in the register, step S50
6, the switch 604 and the parameter registration table 608
Check the line type by referring to. In step S507,
If the line is a PB line, the process proceeds to step S508.
The number of the register 621 is sent as a selection signal to the PSTN network by the DTMF signal. If the line is a DP line, the process proceeds to step S509 and the DP signal
The PSTN network 13 using the number of the register 621 as a selection signal
Send to.

After the transmission of the selection signal is completed, it is checked in step S510 whether the line connection is completed. Here, the call progress signal detection unit 616 and the polarity detection unit 618 monitor the connection state, and if the line connection is incomplete due to busy or the like, the process proceeds to step S511, and the X. In addition to disconnecting the call following the 25 procedure, the communication management table 606 shows the communication result in step S512.
To record. On the other hand, if it is determined that the line connection is completed, the process proceeds to step S513, and the timer 610
Is activated to enter the waiting state for receiving an answer tone signal.

In step S514, it is determined whether an answer tone signal has been received within a fixed time. Here, if the answer tone signal is received, the process proceeds to step S515, the answer back tone is generated by the TONE signal generating unit 613, and is transmitted to the PSTN network 13. At step S516, the device (PC2) The bridge (G4) mode is set.

On the other hand, if the answer tone has not been received before the timer 610 times out, the process advances to step S517 to further check whether or not the DIS, which is the tonal signal of the G3 procedure, has been received. Where D
If the IS signal is received, the partner machine determines that it is a G3 facsimile machine, and in step S518, the apparatus (PC2) enters the G3 / G4 conversion mode (S51).
3).

If neither answer tone nor tonal signal (DIS) is received before the timer 610 times out, the process returns to step S511 to execute the above-described steps S511 to S512.

(6) ISDN automatic dial device (IA
D) Operation explanation of 6a, 6b Here, the operation at the time of data transmission from the G4 facsimile apparatus will be explained with reference to the flowchart shown in FIG.

First, at step S701, if the SETUP message is received from the ISDN compatible G4 facsimile machines 2a and 2b connected to the terminal side I / F section 301,
Then, in step S702, the destination address of the SETUP message received and the ESC code registered in the registration table 305 are compared. As a result of the comparison, if it is determined in step S703 that the destination address includes the ESC code, the process proceeds to step S704, and if it is determined that the ESC code is not included, the process proceeds to step S705.

In step S704, as shown in FIG. 11, NTA corresponding to ESC is stored in table 305 in the destination address field, SAN (with check digit) and SID, and SETUP received from the terminal (IS4 G4 facsimile apparatus supporting ISDN). The number obtained by deleting the ESC code from the destination address of the message is set as CDA in the inter-user information field and transmitted to the ISDN network 14.

In step S705, the SETU received from the ISDN compatible G4 facsimile apparatus 2a, 2b is received.
The P message is transmitted to the ISDN network 14 as it is.

(7) Gateway device (PC3) 8a,
Explanation of Operation of 8b Here, an operation at the time of receiving data from the ISDN network 14 will be described with reference to the flowchart shown in FIG.

First, if a SETUP message is received from the ISDN network 14 in step S801, step S801
At 802, the field of the inter-user information of the SETUP message received is checked. Here, receive SE
If there is no inter-user information in the TUP message, the process proceeds to step S809 to disconnect the ISDN call with the corresponding disconnection code, and further records the communication result in the communication management table 511 in step S810. On the other hand, if the received SETUP message includes the inter-user information, the process proceeds to step S803.

In step S803, the number element in the user-to-user information is checked. If there is no error in the number element, the process proceeds to step S804 to assemble a CR packet (X.25) from this number element and construct the PSDN network 14 To X. Step 25: Enter the call setup procedure. On the other hand, when an error such as a dropout is found in the number element in the inter-user information, the processing of steps S809 to S810 is executed.

In step S805, it is checked whether the call setup is completed. Here, if it is determined that the call setup is completed, the process proceeds to step S806 and waits for the completion of communication (that is, the apparatus (PC3) does not participate in upper layer communication). If the communication completion is detected in the process of step S808, the process proceeds to step S810.

On the other hand, if the call setup is not completed,
Or disconnect from the PSDN network 13 or end terminal (CI)
When the packet is received, the process proceeds to step S807, and the disconnection code of this packet (X.25) is ISD.
It is mapped to the N disconnection code (CCITT recommended Q series 931 compliant), and the operation proceeds to steps S809 to S810.

(8) Gateway device (PC3) 8a,
Description of Operation of 8b Here, the operation of transmitting data to the ISDN network 14 will be described with reference to the flowchart shown in FIG.

First, if a CR packet is received from the PSTN network 13 in step S901, then in step S9.
02, the destination address of this CR packet (D
A) is compared with the incoming address registered in the address conversion table 511. The comparison result,
In the process of step S903, if there is no registered address that matches the DA, the process proceeds to step S90.
In step 5, the DA is transmitted as it is to the ISDN network 14 as the destination address of the SETUP message. On the other hand, if there is a registered address that matches the DA, the process proceeds to step S904, and the outgoing address corresponding to the registered incoming address is set as the ISD as the destination address of the SETUP message.
It is transmitted to the N network 14.

Thereafter, in step S906, it is checked whether the call setup for the ISDN network 14 is completed. Here, if it is determined that the call has been disconnected, the process proceeds to step S907, and this disconnection code (based on CCITT recommended Q series 931) is set to X.264. Two
Map to the disconnection code of 5 and use this as the PSTN network 1
3 to the X.3, and in step S908, the X. Disconnect the call according to 25. The communication result is recorded in the communication management table 511 in step S909.

On the other hand, if it is determined that the call setup is normally completed, the process proceeds to step S910, where P
The CA packet of the STN network 13 is transmitted to the ISDN network 14, and the X.X. Complete call setup according to 25. After that, since the communication shifts to the upper layer, the process enters a communication completion waiting state in step S911. If the communication completion is detected in the process of step S912, the process proceeds to step S909, the communication result is recorded, and the process ends.

(9) Facsimile server device (FS) 1
Description of Operation of 1a and 11b Here, the operation of transmitting data to the PSTN network 13 and the ISDN network 14 will be described with reference to the flowchart shown in FIG.

First, in step S1101, if a transmission request for the image data (MMR) stored in the memory 704 is issued, the document management table 705 is referred to based on the document number attached to this image file, and the document destination is designated. To confirm. Next, in step S1102, the destination information is compared with the information stored in the terminal registration table 710 to confirm the type of the partner machine (G4 facsimile machine or G3 facsimile machine).

As a result of the confirmation, the processing is step S1103.
If the destination of the document is registered in the table 710 and it is determined in step S1104 that the destination is a G4 facsimile machine, the process proceeds to step S1105, and the packet switch (CPS) 10a, 10b. , Or a gateway device (PC) via a small packet switch (RU) 9c.
3) Transmission operation starts from 8a and 8b.

On the other hand, in the process of step S1103, the destination of the document is registered in the table 710, and in the check of step S1104,
If it is determined that it is the G3 facsimile machine 3a, 3b or the G4 facsimile machine 1c, 1d connected to the protocol converter (PC1) 5a, 5b, the process proceeds to step S1106, and the packet switch (CP).
S) 10a, 10b, or a small packet switch (R
U) Network adapter device (PC
2) Transmission operation starts from 7a and 7b.

If it is determined in the process of step S1103 that the document destination is not registered in the table 710, the process proceeds to step S1107, and the packet switch (CPS) 10a, 10b or the small packet switch (RU) 9c. Gateway device (P
C3) Make a call in G4 mode from 8a and 8b.

Next, the process checks in step S1108 if the call setting (CCITT recommended Q series 931 compliant) is successful. If the call setting is successful, the process proceeds to step S1110 to enter the document transmitting operation. . On the other hand, when the call setting is disconnected from the network or the end terminal, the process proceeds to step S1109 to compare the disconnection cause with the operation condition registered in the parameter registration table 711. It should be noted that the table 711 defines operations for the cause of disconnection (fallback transmission cancellation, retransmission processing, etc.).

In step S1111, it is checked whether or not the operation for the disconnection cause is the fallback operation from the G4 mode to the G3 mode. Here, the operation is G
In the case of the fallback operation from the 4 mode to the G3 mode, the process proceeds to step S1112 and refers to the address conversion table 712 to route the packet switch from the gateway devices (PC3) 8a and 8b to the network adapter device (PC2) 7a. , 7b. The address is changed according to 121, and the process proceeds to step S1106 to start the transmission operation from the PSTN network 13. On the other hand, when the operation for the disconnection cause is not the fallback operation from the G4 mode to the G3 mode,
The process advances to step S1113 to further check whether the operation is transmission stop.

If the operation determined in step S1113 is the transmission stop, the process proceeds to step S1114 to erase the corresponding document, and further to step S11.
In step 15, a delivery confirmation report of transmission failure is created, the source terminal is confirmed from the document management table 705, and this report is transmitted. On the other hand, the cause of disconnection is a net,
Alternatively, if it cannot be received temporarily due to the circumstances of the other party, the process proceeds to step S1116 to enter the resend operation.

Therefore, according to this embodiment, when it is necessary to change the communication mode due to a change in the communication environment, or
Even when it is necessary to execute communication under an environment different from the environment set in advance, it is possible to automatically change the communication mode or switch the line to continue the facsimile communication.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0094]

As described above, according to the present invention, in the fallback operation, the first format, for example, group
Since the data transmission of the facsimile such as III is controlled to be performed using the PSTN network, there is an effect that the resources of the ISDN network can be used more efficiently.

[0095]

[Brief description of drawings]

FIG. 1 is a configuration diagram of a facsimile network system that is a typical embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an automatic dial device (PAD) for PSTN.

FIG. 3 is a block diagram showing a configuration of an ISDN automatic dial device (IAD).

FIG. 4 is a block diagram showing a configuration of a protocol conversion device (PC1).

FIG. 5 is a block diagram showing a configuration of a gateway device (PC3).

FIG. 6 is a block diagram showing a configuration of a network adapter device (PC2).

FIG. 7 is a block diagram showing a configuration of a facsimile server device (FS).

FIG. 8 is a registration table 214 of the PSTN automatic dial device (PAD) and the ISDN automatic dial device (IA).
D) is a diagram showing an internal configuration of a registration table 305.

FIG. 9 is a diagram showing a communication sequence between a PSTN automatic dial device (PAD) and a network adapter device (PC2).

FIG. 10 is a diagram showing a communication sequence between an ISDN automatic dial device (IAD) and a gateway device (PC3).

FIG. 11 is a diagram showing a format of a transmission SETUP message when an ISDN automatic dialing device (IAD) executes address conversion.

FIG. 12 is an address conversion table 407 of a protocol conversion device (PC1) and a network adapter device (PC).
It is a figure which shows the internal structure of the address conversion table 607 of 2).

FIG. 13 is a flowchart showing a transmission operation of the PSTN automatic dial device (PAD).

FIG. 14 is a flowchart showing a transmission operation of an automatic dial device (PAD) for PSTN.

FIG. 15 is a flowchart showing an operation when the protocol conversion device (PC1) transmits data from the G4 facsimile device.

FIG. 16 is a flowchart showing an operation when the protocol conversion device (PC1) transmits data from the G4 facsimile device.

FIG. 17: The network adapter device (PC2) is PS
7 is a flowchart showing an operation when receiving data from the TN network 13.

FIG. 18 is a flowchart showing an operation when the protocol conversion device (PC1) receives data from the PSTN network 13.

FIG. 19: The network adapter device (PC2) is PS
6 is a flowchart showing an operation when transmitting data to the TN network 13.

FIG. 20: The network adapter device (PC2) is PS
6 is a flowchart showing an operation when transmitting data to the TN network 13.

FIG. 21: ISDN automatic dial device (IAD) is G
4 is a flowchart showing an operation when transmitting data from four facsimile machines.

FIG. 22: The gateway device (PC3) is the ISDN network 1
4 is a flow chart showing an operation when receiving data from No. 4 of FIG.

FIG. 23: The gateway device (PC3) is the ISDN network 1
4 is a flowchart showing an operation when transmitting data to No. 4.

FIG. 24: The facsimile server device (FS) is PSTN
6 is a flowchart showing an operation when transmitting data to the network 13 and the ISDN network 14.

[Explanation of symbols]

1a-1d X. 25 compatible G4 facsimile machine 2a, 2b ISDN compatible G4 facsimile machine 3a, 3b G3 facsimile machine 4a, 4b automatic dial device (PAD) 5a, 5b protocol conversion device (PC1) 6a, 6b automatic dial device (IAD) 7a, 7b network Adapter device (PC2) 8a, 8b Gateway device (PC3) 9a-9c Small packet switch (RU) 10a, 10b Large packet switch (CPS) 11a, 11b Facsimile server device (FS) 206, 619 DTMF signal detector 207 DTMF signal Generator 211, 415, 616 Call progress / TONE
Signal detection unit 214, 305 registration table 216, 304, 411, 504, 614 CPU 413, 613 TONE signal generation unit 505, 608 Parameter registration table

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H04N 1/32 H04N 1/32 Z (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 1/00-1 / 00 108 H04N 1/32-1/36 101 H04M 11/00-11/10 H04L 12/00-12/26 H04L 12/50-12/66

Claims (2)

(57) [Claims] 1. A facsimile system, including a facsimile server device, a gateway device , and a network adapter device , for transmitting and receiving facsimile data by connecting to an integrated digital communication network (ISDN) and public telephone network (PSTN). The device is stored in the document management table and terminal registration table.
Destination and destination of facsimile data
A device for confirming the device type, and the confirmation result in the terminal registration table as a result of the confirmation.
If it is judged that there is a registration of the millimeter data transmission destination,
The gate according to the type of the confirmed transmission partner device
Via the way device or the network adapter device
And send the facsimile data to the destination.
Control means, and as a result of the confirmation, the fax is added to the terminal registration table.
If it is determined that the millimeter data transmission destination is not registered,
Connected to the ISDN by the gateway device
Make a call to a second type facsimile machine
Means for controlling the call, and if the call setup is successful as a result of the call, the
The fax data is sent from the tway device.
Means for cormorants control, the result of the call, call setup is cut nets, from end terminal
If this happens, the cause of disconnection and the action for that cause are specified.
Stored in the registered parameter registration table
Based on the means for comparing the operating conditions and the comparison, the operation for the disconnection cause is the second
From the send operation in the form to the send operation in the first form
If it is determined that the
And a means for controlling the facsimile data to be transmitted to the facsimile machine of the first type connected to the PSTN via a network adapter . 2. The facsimile system according to claim 1, wherein the first type facsimile machine is a group III facsimile machine, and the second type facsimile machine is a group IV facsimile machine.