JP3171964B2 - 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 apparatus and a group II facsimile apparatus.
I. A facsimile system in which a facsimile apparatus and a facsimile server apparatus coexist and perform facsimile transmission and reception mutually.

[0002]

2. Description of the Related Art G spans a PSTN network and an ISDN network.
In a conventional facsimile network system capable of transmitting and receiving 4 facsimile and G3 facsimile, A. B. Security of communication between a facsimile server device (hereinafter referred to as a server) and each terminal (the facsimile device itself); Fallback operation of facsimile transmission (G4
Mode to G3 mode), C.I. Setting the communication mode of the protocol converter for connecting the G4 mode facsimile apparatus to the PSTN network; PSTN network and ISD
The network adapter device connecting the N network is a PST
Communication mode setting for receiving information from the N network has been performed as follows.

A. Security in communication between server and facsimile machine The ID (password) assigned to the user is registered in the server in advance, and the ID information sent from the user (facsimile machine) is registered with the information registered in the server during actual communication. By comparing, it was configured to prevent unauthorized use of unregistered persons.

B. Fallback operation of facsimile transmission IS when a facsimile machine on the transmitting side makes a call (SETUP message transmission) to ISDN network in G4 mode.
When recognizing a disconnection code (code compliant with Q series recommended by CCITT) from the DN network, if the facsimile apparatus satisfies a predetermined fallback condition, ISDN
It was configured to originate a call from the port in G3 mode.

C. PST G4 mode facsimile machine
Communication mode setting of protocol converter connected to N-network The protocol converter has changed the communication mode according to the destination terminal as follows. (1) At the time of communication, a communication mode is designated from a facsimile machine on the transmission side. (2) The logical address and terminal type of the destination terminal are registered in the protocol converter in advance, and the communication mode is changed according to the address. (3) Manually set the communication mode of the protocol converter during communication.

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

[0007]

However, in the above conventional example, there are the following problems with respect to the respective items A to D described above.

A. Security protection in communication between server and facsimile machine All ID information checks are performed by the server.
Since one or a plurality of IDs are fixedly assigned to the user, there are the following disadvantages. (1) In the case of the network system configuration as shown in FIG. 1, if the number of unauthorized accesses increases, the traffic in the PSTN network increases, the communication efficiency of the PSDN network decreases, and the load on the server increases. (2) Since ID information is fixedly assigned, unauthorized use can be easily made once the ID number is known.

B. Fallback operation of facsimile transmission Facsimile transmission in G3 mode (communication speed: ~ 1
Regardless of whether the transmission speed is 4.4 kbps or facsimile transmission in the G4 mode, Bch (communication speed:
Since one line is occupied by 64 kbps, there is a disadvantage that the line efficiency is reduced.

C. PST G4 mode facsimile machine
Communication mode setting of protocol conversion device connected to N network When a G4 facsimile apparatus supporting 25 protocols performs facsimile communication, there are the following problems in changing or changing the communication mode according to the communication partner apparatus. (1) X. Since the G4 facsimile apparatus supporting the 25 protocol itself does not have a function of designating a communication mode, an apparatus having a special additional function is required to change the communication mode. (2) A huge amount of memory is required to register the logical addresses and terminal types of all communication destination terminals (facsimile devices) in the protocol conversion device, resulting in a very high cost of the device. was there. in addition,
Every time the information about the communication partner terminal changes due to a model change, new installation, abolition, movement, etc., it is necessary to reflect that information in the memory, which involves a rather complicated operation from the viewpoint of system operation maintenance. (3) Changing the communication mode by manual operation on the protocol converter is very bad in terms of operability. (4) Each of the above (1) to (3) presupposes that the type of the communication partner device is known, and if the type of the partner device is unknown, facsimile transmission is not possible.

D. Communication mode setting when facsimile data is received from the PSTN network of the network adapter device connecting the PSTN network and the ISDN network (1) G4 mode compatible facsimile device via protocol converter, G3 mode via PSTN compatible automatic dial device Since it is necessary to install a dedicated adapter device for each of the corresponding facsimile machines, not only is line management and equipment management troublesome, but also when a G4 mode compatible line or G3 mode compatible line is not used. It could not be reused and used, and there was a problem in terms of system operation flexibility. (2) The facsimile data received from the PSTN is G
If the communication mode is changed from a facsimile apparatus compatible with three modes, the communication mode is changed by D from the facsimile apparatus.
Although it can be performed by manually transmitting a TMF signal, there is a problem in terms of operability. (3) If the facsimile data received from the PSTN is from a G4-mode compatible facsimile machine via a protocol converter, the communication mode cannot be changed due to the protocol.

The present invention has been made in view of the above conventional example, and has as its object to provide a facsimile network system excellent in security.

[0013]

[0014]

[0015]

To achieve the above object, a facsimile system of the present invention has the following configuration. That is, at least a facsimile device of the first type, a facsimile device of the second type, a gateway device, a protocol conversion device, a network adapter device,
An automatic dialing device compatible with the first type of facsimile device, an automatic dialing device compatible with the second type of facsimile device, an integrated digital communication network (ISDN),
In a facsimile system connecting to a public telephone network (PSTN) and mutually transmitting and receiving facsimile data,
An automatic dialing device corresponding to the first type facsimile device has first user information for transmitting user information to the network adapter device via the PSTN based on a predetermined code from the first type facsimile device. The protocol converter includes a DTMF signal or a selection signal based on information of a communication partner to the network adapter device via the PSTN based on predetermined information from the facsimile device of the second format. Selection signal transmission means for transmitting by a DP signal, response signal reception means for waiting for a response from the network adapter device for a predetermined time after transmission of the selection signal, and, when the response is received, a confirmation signal as confirmation of the reception Confirmation signal transmitting means for transmitting a confirmation signal to the network adapter device. The network adapter device includes first check means for checking the contents of the user information transmitted from the automatic dial device corresponding to the facsimile device of the first format, and the selection signal transmitted from the protocol conversion device. Response means for transmitting a response signal to the protocol conversion device in response to the call signal based on, a predetermined time after the transmission of the response signal by the response means,
Confirmation signal receiving means for waiting for the confirmation signal from the protocol conversion device, and first control means for controlling facsimile communication to be cut off based on a check result by the first check means and a wait result by the confirmation signal receiving means. The automatic dialing device corresponding to the facsimile device of the second type has the IS based on a predetermined code from the facsimile device of the second type.
A second user information transmitting unit configured to transmit user information to the gateway device via the DN, wherein the gateway device receives the second type of facsimile device received via the ISDN from the automatic dial device. Second checking means for checking the contents of the user information;
A facsimile system, comprising: a second control unit that controls facsimile communication to be disconnected based on a check result of the second check unit.

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

According to the above construction, the present invention can be applied to the first format, for example, user information transmitted from an automatic dial device corresponding to a facsimile device such as Group III and information of a communication destination transmitted from a protocol conversion device. The network adapter device based on the selection signal based on
, For example, based on the user information transmitted from the automatic dial device corresponding to the facsimile device such as the group IV, the gateway device controls to disconnect the facsimile communication.

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

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

Reference numerals 6a and 6b denote automatic dial devices (IAD) connected between an ISDN-compatible G4 facsimile device and an ISDN network, and reference numerals 7a and 7b denote a PSTN network and a PSD.
A network adapter device (PC2) for connecting an N-network and performing address conversion between the two and protocol conversion between G3 facsimile and G4 facsimile, and 8a and 8b are ISs.
A gateway device (PC3) that connects a DN network and a 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 A facsimile server device (FS: hereinafter, referred to as a server) 12 is a network management device (NC) for performing overall management, billing, and the like.
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 device (PAD) 4a, 4b shown in FIG. In FIG. 2, reference numeral 201 denotes an I / F unit with a terminal (here, a G3 facsimile machine);
A DC loop detector for monitoring the ON / OFF hook state of the 3-facsimile apparatus, 203 is a power supply circuit, 204 is a signal generator for generating a call progress tone such as a busy tone, etc., 205a and 205b are line switching circuits, and 206 is a G3 facsimile. D for decoding the selection signal from the device
TMF signal detection section, 207 is a DTMF signal (PB) generation section, 208 is a selection signal (DP) generation section, 209 is a DTM signal
A transmission signal switching circuit for an F signal (PB) generation unit 207 and a selection signal (DP) generation unit 208, and 210 is a telephone network (PST)
N) and an I / F unit 211, a call progress signal detecting unit for recognizing a call progress tone from the network,
212 is a DC loop forming circuit, 213 is a polarity detecting circuit,
214 is a table for registering various types of conversion information, 215 is a switch for setting the operation mode and line type, etc., 216 is a CPU, 217 is a memory, and 218 is a timer.

FIG. 3 is a block diagram showing a detailed configuration of the automatic dial apparatus (IAD) 6a, 6b for ISDN shown in FIG. In FIG. 3, reference numeral 301 denotes a terminal (ISDN
I / F unit with a corresponding G4 facsimile machine), 302 is a power supply circuit, 303 is a memory, 304 is a CPU, 305 is a table for registering various types of conversion information, 306 is a display unit for displaying operating status and line status, and 307 is This is an ISDN (basic rate) I / F unit.

FIG. 4 is a block diagram showing a detailed configuration of the protocol converters (PC1) 5a and 5b shown in FIG. 4, reference numeral 401 denotes a terminal (X.25 compliant G4).
I / F unit (X.25 control unit) with facsimile machine)
Reference numeral 402 denotes an RS 23 for connecting a terminal for setting parameters and the like.
2C interface (I / F) port; 403, a display unit that indicates an operation state; 404, a switch for setting various operation modes, etc .; 405, a memory; 406, a registration table for various parameters; A table 408, an encoder / decoder for performing G4 mode (MMR) / G3 mode (MH / MR) image data conversion, 409 a counter, 410 a timer, 411 a CPU for overall control, and 412 a selection signal (DP / P
B) generating section, 413 is a tone signal generating section, 414 is a modem, 415 is a call progress signal detecting section for recognizing a call progress tone from the PSTN network, 41
6 is a DC loop forming circuit, 417 is a detecting unit for detecting the polarity of the local line, 418 is an I / F unit with the PSTN, 41
Reference numeral 9 denotes a register for storing the number element of the selection signal to be transmitted to the PSTN network.

FIG. 5 is a block diagram showing a detailed configuration of the gateway devices (PC3) 8a and 8b shown in FIG. In FIG. 5, reference numeral 501 denotes an ISDN (basic rate) I / F unit, and 502 denotes a PSDN (X.25) I / F.
Unit, 503 is a memory, 504 is a CP for performing overall control
U and 505 are registration tables of various parameters, 506 is a counter, 507 is a timer, 508 is a table for registering address conversion information, 509 is a display unit showing an operation state,
510 is a switch for setting various operation modes, etc. 511 is a management table for recording communication results, data amount, etc., 512
Is an RS232C interface (I / F) port for connecting a parameter setting terminal.

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

FIG. 7 is a block diagram showing a detailed configuration of the facsimile server (FS) 11a, 11b shown in FIG. In FIG. 7, reference numeral 701 denotes a 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 and 704 are memories, 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
9 is an encoder / decoder that encodes / decodes MMR data when performing conversion of 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 and keyboard. Part, 71
Reference numeral 4 denotes a local area network (LAN) I / F.

FIG. 8 is a diagram showing the internal structure of the registration table 214 of the PSTN automatic dialing devices 4a and 4b shown in FIG. 2 and the registration table 305 of the ISDN automatic dialing 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 automatic dialing devices (IAD) 6a and 6b for ISDN and the gateway device (P) shown in FIG.
C3) A diagram showing a sequence at the time of communication between 8a and 8b.

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

FIG. 12 shows the address conversion tables 407 of the protocol converters (PC1) 5a and 5b shown in FIG. 4 and the network adapter (PC2) 7 shown in FIG.
FIG. 9 is a diagram showing an internal configuration of an address conversion table 607 of FIGS.

[Description of Operation of Each Component (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) PSTN automatic dialing device 4a,
Operation of 4b (PAD) 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 apparatus 3a, 3b connected to unit 201
Is detected by the DC loop detection unit 202, the process proceeds to step S102, in which power is supplied from the power supply circuit 203 to the G3 facsimile apparatuses 3a and 3b, and a dial tone is generated by the call progress signal generation unit 204. G3 facsimile machines 3a, 3b
, And waits for a selection signal.

In step S103, it is determined whether or not the selection signal (PB) has been received within a predetermined time.
If the selection signal (PB) has not been sent, the process proceeds to step S104, in which the call progress signal generation unit 204 generates a howler sound, which is transmitted to the G3 facsimile apparatuses 3a and 3b, and the DC loop is performed. To open the door. On the other hand, if the selection signal is received from the G3 facsimile apparatuses 3a and 3b within a predetermined time, the processing proceeds to step S105, and the received selection signal is identified with reference to the registration table 214.

Subsequently, in step S106, step S
It is checked whether or not the selection signal identified at 105 has an escape code (ESC) registered in the table. Here, if there is no ESC, the process proceeds to step S107, referring to the switch 215, and using the selection signal corresponding to the line type, the G3 facsimile machine 3a, 3
b is sent to the PSTN 13 as it is, and in step S108, the switching circuits 205a, 205
05b, PSTN line and G3 facsimile machine 3
a and 3b are directly connected.

On the other hand, if there is an ESC, the process proceeds to step S109, and the line type is confirmed with reference to the switch 215. Then, the process proceeds to step S110.
, It is checked whether the line is a PB line. If the line is a PB line, the process sends a network address (NTA) corresponding to the ESC received by 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 transmitted to the PSTN network via the DP line.

After the transmission of the selection signal is completed, the process proceeds to step S
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 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 apparatuses 3a and 3b.

On the other hand, if it is determined that the user is not busy, the process proceeds to step S115 to connect the line.
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 and 7b has been received within a predetermined time. If the third tone signal is received, the process proceeds to step S117 with reference to the registration table 214, the user ID (SAN: with check bit) corresponding to the ESC received from the G3 facsimile machine 3a, 3b, and the service. The identifier (SID) is transmitted by 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 predetermined 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 PSTN lines are directly connected to the G3 facsimile machines 3a and 3b, the system enters an on-hook waiting state due to the end of communication.

(2) Protocol converters 5a and 5b (P
Description of the operation of C1) Here, the operation at the time of data transmission from the G4 facsimile machines 1c and 1d will be described with reference to the flowcharts shown in FIGS.

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

The address conversion table 407 has a configuration 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. Here, if the DA number element is registered, the process proceeds to step S204, and the corresponding telephone number is stored 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 stored in the register 4 as it is.
19 is stored.

Next, in step S206, the switch 404
And confirms 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 proceeds to step S208.
And sends the number of the register 419 to the PSTN 13 as a selection signal using a DTMF signal. On the other hand, if the line is a DP line, the process proceeds to step S209, in which the number of the register 419 is transmitted to the PSTN 13 as a selection signal by the DP signal.

After completion of transmission of the selection signal, step S210
Then, the connection status is monitored by the call progress signal detection unit 415 and the polarity detection unit 417 to check whether the line connection is completed. If it is determined that the line connection has failed, the process advances to step S211 to set the cause of the failure in the disconnection cause column of the CI packet, transmit it to the G4 facsimile machine 1c, d, and disconnect the call. I do. On the other hand, if it is determined that the line connection has been completed, the process proceeds to step S212, where the network adapter device (P
C2) Wait for an answer tone signal from 7a, 7b or the same type of protocol converter (PC1).

In step S213, it is checked whether an answer tone signal has been received within a predetermined time. If the answer tone signal has been received, the process proceeds to step S214 to send an answer back tone signal. In step S215, the operation enters a G4 mode (modulating and transmitting G4 communication by a modem). .

On the other hand, if the answer tone signal has not been received within the predetermined time, the process advances to step S216 to check whether DIS which is a signal of the G3 procedure has been received. Here, if the DIS signal has been received, the process proceeds to step S217, where G3 / G
The operation enters a 4-conversion mode (protocol conversion MH / MR ← → MMR conversion, etc.). On the other hand, if no DIS signal is received and no signal other than the DIS signal is received, or if no signal is received, the other party is regarded as an uncommunicable terminal and the process proceeds to step S218, where 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 13 will be described with reference to the flowchart shown in FIG.

First, in step S301, the PSTN 13
Progress signal detection unit 61
If detected in step 6, a DC loop is formed by the DC loop forming circuit 617, and in step S302, a confirmation tone (Conf.Tone) is generated by the TONE signal generator 613 and transmitted to the PSTN network 13. After the completion of transmission of the confirmation tone (Conf.Tone), the process starts the timer 610 in step S303, and waits for a DTMF signal.

Here, if the DTMF signal is not received within a predetermined time, the process proceeds to step S304, where the TONE signal generation unit 613 generates an answer tone and the PSTN network 13
, And the timer 610 is restarted in step S305 to be in a state of waiting for the answer back tone signal. Here, if the answer back tone signal is received within a predetermined time, the partner device is connected to the protocol converter (PC1) 5
a, 5b connected to the G4 facsimile machine,
The process proceeds to step S306, and enters an operation state of the bridge (G4) mode.

On the other hand, in step S303,
If the DTMF signal has been 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 other party is a G3 facsimile apparatus connected to the PSTN automatic dial device (PAD) 4a, 4b, and the process proceeds to step S309, where G3 / The operation state is the G4 conversion mode.

In step S305, if no answer back tone signal is received within a predetermined time, no signal is received, or if a signal other than the answer back tone signal is received, or if the answer back tone signal is received in step S308. D
If it is determined that the number element of the TMF signal is invalid (missing element, error, etc. is detected), the process proceeds to step S3.
In step S311, the communication record is recorded in the communication management table 606.

(4) Protocol converters 5a and 5b (P
Description of the operation of C1) Here, the operation when data is received from the PSTN 13 will be described with reference to the flowchart shown in FIG.

First, at step S401, the PSTN network 1
The full-progress signal detection unit 41
If detected in step 5, a DC loop is formed by the DC loop forming circuit 416, and in step S402, an answer tone is generated by the TONE signal generator 413 and transmitted to the PSTN 13. Then, in step S403, the timer 4
10 is activated, and the system enters a state of waiting for reception of an answer back tone.

In step S403, if the answer back tone signal is received within a predetermined period of time, the other party is a G4 facsimile machine connected to the protocol converter (PC1) or a network adapter (PC).
2) Judging that it is 7a, 7b, the process proceeds to step S408, and enters the G4 mode operation state.

On the other hand, if the answer back tone signal is not received within a predetermined time, the process proceeds to step S404.
To send the G3 procedure tonal signal DIS,
Further, in step S405, the timer 409 is restarted to be in a signal reception waiting state of the G3 procedure.

In step S405, if a signal of the regular G3 procedure is received within a predetermined time, the other party will
It is determined that the apparatus is a facsimile apparatus, and the process proceeds to step S406 to be in an operation state of the G3 / G4 conversion mode. On the other hand, if a signal of the regular G3 procedure is not received or no signal is received within a predetermined time, the other party is determined to be a communication incapable device, and the process proceeds to step S407 to execute DC Release the loop and disconnect the communication.

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

First, in step S501, the PSDN (X.2
5) If the reception of the CR packet is detected at the port, then, in step S502, the destination address (DA) of the received CR packet and the address conversion table 607
Compare the incoming address registered in. As a result, in the process of step S503, when there is a matching number element, the process proceeds to step S504, and stores the telephone number corresponding to the incoming address of the table 607 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, switch 604, parameter registration table 608
And check the line type. In step S507,
If the line is a PB line, the process proceeds to step S508.
And the number of the register 621 is transmitted to the PSTN network as a selection signal by the DTMF signal. If the line is a DP line, the process proceeds to step S509, where the DP signal is used.
The PSTN network 13 uses the number of the register 621 as a selection signal.
Send to

After completion of the selection signal transmission, it is checked in step S510 whether or not the line connection has been completed. Here, the connection status is monitored by the call progress signal detection unit 616 and the polarity detection unit 618, and if the line connection is not completed due to busy or the like, the process proceeds to step S511, where X. In step S512, the communication result is stored in the communication management table 606.
To record. On the other hand, if it is determined that the line connection has been completed, the process proceeds to step S513, and the timer 610
Is activated to enter a state of waiting for an answer tone signal.

In step S514, it is determined whether an answer tone signal has been received within a predetermined time. Here, if an answer tone signal is received, the process proceeds to step S515, where an answer back tone is generated by the TONE signal generation unit 613 and transmitted to the PSTN network 13. Further, in 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 has timed out, the process advances to step S517 to check whether or not the G3 procedure tonal signal DIS has been received. Where D
If the IS signal has been received, the partner machine is determined to be a G3 facsimile machine, and in step S518, the machine (PC2) enters the G3 / G4 conversion mode (S51).
3).

If neither an answer tone nor a 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) Automatic Dialing Device for ISDN (IA
D) Description of Operations of 6a and 6b Here, operations at the time of data transmission from the G4 facsimile apparatus will be described with reference to the flowchart shown in FIG.

First, if a SETUP message is received from the ISDN-compliant G4 facsimile apparatus 2a, 2b connected to the terminal side I / F section 301 in step S701,
Subsequently, the destination address of the SETUP message received in step S702 is compared with the ESC code registered in the registration table 305. As a result of the comparison, if it is determined in step S703 that the ESC code is included in the destination address, the process proceeds to step S704. 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, the NTA corresponding to the ESC is set in the destination address field in the table 305, the SAN (with check digit) and the SID, and the SETUP received from the terminal (IS4 compliant G4 facsimile machine). The number obtained by removing the ESC code from the destination address of the message is set as a CDA in the inter-user information field and transmitted to the ISDN 14.

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

(7) Gateway device (PC3) 8a,
Description of Operation of 8b Here, the operation at the time of receiving data from the ISDN 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,
At 802, the field of the information between users of the received SETUP message is checked. Here, the receiving SE
If there is no inter-user information in the TUP message, the process proceeds to step S809, disconnects the ISDN call with the corresponding disconnection code, and records the communication result in the communication management table 511 in step S810. On the other hand, if there is inter-user information in the received SETUP message, the process proceeds to step S803.

In step S803, the number element in the inter-user information is checked. If there is no error in the number element, the process proceeds to step S804, where a CR packet (X.25) is assembled from this number element, and the PSDN network 14 To X. 25. The call setting procedure starts. On the other hand, when an error such as missing 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 setting has been completed. Here, if it is determined that the call setup is completed, the process proceeds to step S806, and waits for completion of communication (that is, the present 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 the end terminal (CI)
If a packet has been received, the process proceeds to step S807, where the disconnection code of this packet (X.25) is set to ISD
It maps to N disconnection codes (based on CCITT recommendation Q series 931) and proceeds to the operation of steps S809 to S810.

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

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

Thereafter, in step S906, it is determined whether or not the call setting for the ISDN 14 has been completed. Here, if it is determined that the call has been disconnected, the process proceeds to step S907, and the disconnection code (based on CCITT recommended Q series 931) is set to X. 2
5 to the PSTN network 1
3 and further, in step S908, X.3. 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 has been completed normally, 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.ST. 25 complete the call setup. Thereafter, the communication shifts to the upper layer, so that 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, records the communication result, and ends.

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

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

As a result of the confirmation, the processing proceeds to step S1103.
In step S1104, 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, where the packet switches (CPS) 10a, 10b Or a gateway device (PC) via a small packet switch (RU) 9c.
3) The transmission operation starts from 8a and 8b.

On the other hand, the destination of the document is registered in the table 710 in the process of step S1103, and in the check of step S1104,
If it is determined that the device is the G3 facsimile device 3a, 3b or the G4 facsimile device 1c, 1d connected to the protocol converter (PC1) 5a, 5b, the process proceeds to step S1106, where the packet switch (CP
S) 10a, 10b or a small packet switch (R
U) Network adapter device (PC) via 9c
2) The transmission operation starts from 7a and 7b.

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

Next, in step S1108, it is checked whether or not the call setup (based on CCITT recommendation Q series 931) has been successful. If the call setup has been successful, the process proceeds to step S1110 to start the document transmission operation. . On the other hand, if the call setting has been disconnected from the network or the end terminal, the process advances to step S1109 to compare the cause of disconnection with the operating conditions registered in the parameter registration table 711. Note that the table 711 defines the operation for the cause of disconnection (fallback transmission stop, retransmission processing, etc.).

In step S1111, it is checked whether the operation for the cause of the disconnection is a 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 to change to X. 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 proceeds to step S1113, and further checks whether the operation is transmission suspension.

If the operation determined in step S1113 is transmission stop, the process advances to step S1114 to delete the document, and further to step S11.
In step 15, a transmission failure delivery confirmation report is created, the transmission source terminal is confirmed from the document management table 705, and this report is transmitted. On the other hand, the cause of disconnection is net,
Alternatively, if reception is temporarily not possible due to circumstances of the other party, the process advances to step S1116 to start a retransmission 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 communication needs to be performed in an environment different from the environment set in advance, the facsimile communication can be continued by automatically changing the communication mode or switching the line.

The present invention may be applied to a system including a plurality of devices, or may be applied to an apparatus including a single device. Needless to say, the present invention can be applied to a case where the present invention is achieved by supplying a program to a system or an apparatus.

[0097]

As described above, according to the present invention, since the execution of facsimile communication is controlled irrespective of a specific password or the like, there is an effect that facsimile data transmission with higher security can be performed. This also has the advantage that the increase in traffic on the data network due to improper facsimile data transmission does not occur.

[0098]

[0099]

[Brief description of the 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 a PSTN automatic dialing device (PAD).

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

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 illustrating a configuration of a facsimile server device (FS).

FIG. 8 shows a registration table 214 of an automatic dialing apparatus for PSTN (PAD) and an automatic dialing apparatus for ISDN (IA).
D) A diagram showing the internal structure of the 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 automatic dial device for ISDN (IAD) executes address conversion.

FIG. 12 shows an address conversion table 407 of a protocol conversion device (PC1) and a network adapter device (PC).
FIG. 3 is a diagram showing an internal configuration of an address conversion table 607 of 2).

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

FIG. 14 is a flowchart showing a transmission operation of the PSTN automatic dialing device (PAD).

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 shows that the network adapter device (PC2) is PS
5 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 converter (PC1) receives data from the PSTN 13;

FIG. 19 shows that the network adapter device (PC2) is PS
5 is a flowchart illustrating an operation when transmitting data to the TN network 13.

FIG. 20 shows that the network adapter device (PC2) is PS
5 is a flowchart illustrating an operation when transmitting data to the TN network 13.

FIG. 21: Automatic dialing device (IAD) for ISDN is G
6 is a flowchart showing an operation when transmitting data from a 4-facsimile apparatus.

FIG. 22 shows that the gateway device (PC3) is the ISDN 1
4 is a flowchart showing an operation when receiving data from the C.4.

FIG. 23 shows that the gateway device (PC3) is the ISDN 1
4 is a flowchart illustrating an operation when data is transmitted to No. 4.

FIG. 24: Facsimile server device (FS) is PSTN
5 is a flowchart illustrating an operation when data is transmitted to the network 13 and the ISDN 14;

[Explanation of symbols]

1a to 1d X. 25 compatible G4 facsimile device 2a, 2b ISDN compatible G4 facsimile device 3a, 3b G3 facsimile device 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 detector 214, 305 Registration table 216, 304, 411, 504, 614 CPU 413, 613 TONE signal generator 505, 608 Parameter registration table

Claims (2)

(57) [Claims] At least a facsimile device of a first type, a facsimile device of a second type, a gateway device, a protocol conversion device, a network adapter device,
An automatic dialing device compatible with the first type of facsimile device, an automatic dialing device compatible with the second type of facsimile device, an integrated digital communication network (ISDN),
In a facsimile system for mutually transmitting and receiving facsimile data by connecting to a public telephone network (PSTN), the automatic dial device corresponding to the first type facsimile device includes a predetermined code from the first type facsimile device. A first user information transmitting unit for transmitting user information to the network adapter device via the PSTN based on the protocol conversion device. The protocol conversion device includes a first user information transmitting unit that transmits the user information based on predetermined information from the second format facsimile device. A selection signal based on information of a communication partner is transmitted to the network adapter device via a PSTN by a DTMF signal.
Selection signal transmitting means for transmitting by a signal or a DP signal; response signal receiving means for waiting for a response from the network adapter device for a predetermined time after the transmission of the selection signal ; and Confirmation signal transmitting means for transmitting a confirmation signal to the network adapter device, wherein the network adapter device checks the contents of the user information transmitted from the automatic dial device corresponding to the facsimile device of the first format. 1
Checking means; and the selection signal transmitted from the protocol conversion device.
Response means for transmitting a response signal to the protocol conversion device in response to a call signal based on the confirmation signal receiving means for waiting for the confirmation signal from the protocol conversion device for a predetermined time after transmission of the response signal by the response means; An automatic dial device corresponding to the facsimile device of the second type, the first control device controlling disconnection of facsimile communication based on a check result by the first check device and a waiting result by the confirmation signal receiving device. Includes second user information transmitting means for transmitting user information to the gateway device via the ISDN based on a predetermined code from the facsimile device of the second format, wherein the gateway device includes: said connecting received Fakushi <br/> millimeter device of the second type A facsimile system comprising: a second check unit for examining the contents of the user information from a dynamic dialing device; and a second control unit for controlling facsimile communication to be cut off based on a check result by the second check unit. . 2. The facsimile system according to claim 1, wherein said first type facsimile machine is a group III facsimile machine, and said second type facsimile machine is a group IV facsimile machine.