JP3740388B2 - Facsimile gateway, facsimile gateway control method, and facsimile gateway control program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a facsimile gateway that performs real-time Internet facsimile communication compliant with ITU-T recommendation T.38, a control method thereof, and a control program thereof.
[0002]
[Prior art]
In recent years, there has been a remarkable spread of the Internet, and techniques for applying network communication techniques in various ways have been proposed for facsimile machines.
[0003]
One of them is so-called real-time Internet facsimile communication described in ITU-T recommendation T.38. As shown in FIG. 1, communication described in the recommendation is performed with a facsimile apparatus (A, B) 100 via facsimile gateways (A, B) 104 and 108 connected to an IP network (Internet or intranet) 106. 112 is made to communicate.
[0004]
Facsimile apparatuses (A, B) 100, 112 are connected to facsimile gateways (A, B) 104, 108 via PSTNs (general public lines) 102, 110. If the facsimile machine (A) 100 is the calling party, the facsimile machine 100 calls the gateway 104 via the PSTN 102.
[0005]
The gateway (emitting gateway) 104 forms a connection with the TCP (or UDP) / IP connection gateway (receiving gateway) 108. The gateway 108 calls the facsimile apparatus (B) 112 via the PSTN 110 based on the telephone number information notified from the facsimile apparatus 100 to the gateway 104 by any method, and establishes the call. Thereafter, the G3 facsimile signal is encapsulated in a TCP (or UDP) packet and exchanged according to IFP (Internet facsimile protocol).
[0006]
The current recommendation T.I. 38 only describes a method of performing double dialing to notify the (emitting) gateway 104 of the telephone number of the facsimile machine 112 (Recommendation T.38 Appendix B.2.1), (Receiving) Details of the technical specifications for notifying the gateway 108 of the telephone number of the facsimile machine 112 are not recommended (Recommendation T.38 Appendix B.2.2).
[0007]
2 and 3 show ITU-T recommendation T.30. 38 shows a state of the Internet facsimile communication by 38.
[0008]
2 and 3, reference numeral 201 denotes a transmission side facsimile apparatus (calling side) that transmits an image, and reference numeral 204 denotes a reception side facsimile apparatus, which corresponds to one of the facsimile apparatuses 100 and 112 in FIG. 1.
[0009]
Reference numeral 202 denotes an emitting gateway (transmission side gateway), and 203 denotes a receiving gateway (reception side gateway), which corresponds to one of the gateways 104 and 108 in FIG. These gateway devices can be configured as a dedicated facsimile device having a network interface and a PSTN interface or from a computer system having a similar communication interface.
[0010]
The facsimile protocol signals transmitted / received between the transmission side facsimile apparatus 201 and the emitting gateway 202 and between the reception side facsimile apparatus 204 and the receiving gateway 203 are exactly the same as those of the normal G3 facsimile protocol as shown in the figure. , The so-called T. signal is shown in accordance with the IFP as shown in the center of FIGS. 38 packets are converted and encapsulated in a TCP (or UDP) packet for exchange.
[0011]
T. T. et al. The 38 packets are composed of TYPE and DATA elements. The DATA portion is the actual content of the signal. TYPE includes T30IND (T30 indicator), T30_DATA TYPE indicating the signal modulation method, HDLC_XXX for indicating that the signal transmitted as DATA is in the HDLC format, and the like. Yes (T.38 recommendation 7.2).
[0012]
In this way, even facsimile machines having only a PSTN interface can communicate these via an IP network such as the Internet, and can expect cost reductions such as international call charges that have been required in the past. In this case, as the facsimile machines 100 and 112, a conventional G3 facsimile machine can be used as it is. In addition, there is a possibility that a business opportunity using such a gateway can be provided to a communication carrier.
[0013]
The ITU-T recommendation T.I. 38 describes not only the gateway but also an Internet facsimile machine (IAF) 112a (FIG. 1) capable of directly transmitting and receiving packets exchanged between the gateways. The Internet facsimile machine 112a directly transmits and receives the IFP packet shown in FIGS. 2 and 3 to perform facsimile communication.
[0014]
[Problems to be solved by the invention]
On the other hand, ITU-T recommendation T.I. 30 (April 1999 edition) Table 2 shows the ITU-T recommendation T.30 as described above. It is described that the presence / absence of 38 real-time Internet facsimile communication functions is declared by the bit 3 of the FIF of the DIS / DCS / DTC signal. The ITU-T recommendation T.I. According to 30, when this bit is set to 1, information on the Internet address (or telephone number) of the own device can be transmitted using a CIA, TSA, or CSA signal.
[0015]
In addition, ITU-T recommendation T.I. 38 (or T.30) is not explicitly described in Recommendation T.30. When performing 38 real-time Internet facsimile communications, there is a possibility that signal delay may naturally occur in the IP network, and control for extending the timer length for detecting various procedure signals in consideration of this may occur. Must be done.
[0016]
Therefore, it is conceivable to examine bit 3 of the FIF of the DIS / DCS / DTC signal and determine whether or not to perform control for extending the timer length for detecting various procedure signals. For example, as shown in FIG. 9, when a DIS signal is transmitted from a facsimile apparatus 112 as a receiver to a facsimile apparatus 100 as a transmitter via a gateway 108, the Internet (IP network) 106, and a gateway 104, the facsimile apparatus If both 100 and 112 are new type devices that support control related to the FIF bit 3 of the above-mentioned DIS / DCS / DTC signal, this bit is transmitted to the facsimile machine 100 as it is, and the facsimile machine 100 transmits the bit of the DCS signal. Since 3 is returned to 1, the facsimile apparatus 112 can perform processing in consideration of signal delay in the Internet (IP network) 106 such as extension of a signal detection timer.
[0017]
However, as shown in FIG. 10, if one of the facsimile machines, for example, the facsimile machine 100, is an old machine that does not support the control related to the FIF bit 3 of the DIS / DCS / DTC signal, the new facsimile machine 112 to the FIF Even when a DIS signal having bit 3 set to 1 is received, the bit 3 of FIF is set to 0 in the corresponding DCS signal to be returned and transmitted.
[0018]
In this case, even if the facsimile apparatus 112 is a new type, it is not possible to perform processing in consideration of signal delay in the Internet (IP network) 106 such as extension of the signal detection timer, and communication ends in error or the facsimile apparatus 112 Depending on the specifications of the product, if bit 3 of FIF of the DCS signal is 0, communication may be abandoned and communication may be terminated in error on the spot.
[0019]
Such a problem occurs not only in the cases of FIGS. 9 and 10, but also in the case where the facsimile apparatus on one side of the gateway is an older apparatus that does not understand the control related to the bit 3 of the FIF of the DIS / DCS / DTC signal. It can occur in any transmission / reception of DIS / DCS / DTC signals.
[0020]
The object of the present invention is to solve the above problems and to The real-time Internet facsimile protocol described in No. 38 is used so that the facsimile apparatus can communicate without terminating the communication regardless of whether it is a new model or an old model.
[0021]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, a facsimile gateway for performing real-time Internet facsimile communication conforming to ITU-T Recommendation T.38, a control method thereof, and a control program thereof, the Internet A bit relating to whether or not real-time Internet facsimile communication is supported in the procedure signal received by the protocol or G3 procedure is forcibly converted to a state in which real-time Internet facsimile communication is supported, and then the facsimile apparatus or the partner gateway is used by the G3 procedure or Internet facsimile protocol. Adopted a configuration to transmit to.
[0022]
Alternatively, a configuration is adopted in which the procedure signal is one of a DIS / DCS / DTC signal, and the bit relating to the presence / absence of support of the real-time Internet facsimile communication is bit 3 of FIF of the signal.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
[0024]
In the present invention, as shown in FIG. 11, the facsimile apparatus on one side of the gateway is an old-type apparatus that does not understand the control relating to the bit 3 of the FIF of the DIS / DCS / DTC signal (facsimile 100 in FIG. 11). In consideration of the case, in the transmission / reception of the DIS / DCS / DTC signal, the FIF bit of the DIS / DCS / DTC signal received by the gateway 104 and the gateway 108 from the facsimile apparatuses 100 and 112 and the Internet (IP network) 106 side. 3 is forcibly converted to 1 and transmitted to facsimile machines 100 and 112.
[0025]
FIG. 4 shows the configuration of a facsimile gateway apparatus employing the present invention. The apparatus of FIG. 4 has a PSTN interface for connecting to a facsimile machine and a network interface for connecting to the Internet (IP network), and communicates with the facsimile machine on the PSTN interface side by the G3 facsimile procedure. It is a device that communicates with a counterpart facsimile gateway via an IP network. The device of FIG. 4 operates as an emitting gateway or receiving gateway.
[0026]
In FIG. 4, reference numeral 2 denotes an NCU (network control unit) which is connected to the terminal of the line 2a to use the telephone network for data communication or the like, and performs connection control of the telephone exchange network, This is for switching and holding a loop. Further, the NCU 2 performs control for opening the telephone line 2a (CML off) or connecting the telephone line 2a to the facsimile gateway apparatus side (CML on) based on the control from the bus 26. In the normal state, the telephone line 2a is open.
[0027]
Reference numeral 6 denotes a hybrid circuit which separates a transmission system signal and a reception system signal, sends a transmission signal from the adder circuit 12 to the telephone line 2a via the NCU2, and sends a signal from the other party via the NCU2. Receive and send to demodulator 8 via signal line 6a.
[0028]
Reference numeral 8 denotes a modulator / demodulator. 8, V. 21, V27ter, V.21. 29, V.R. 17, V. 34 is a modulator / demodulator capable of performing modulation and demodulation based on the reference numeral 34. By controlling from the bus 26, each of these transmission modes can be selected. The modem 8 receives the transmission signal from the bus 26, outputs the modulated data to the signal line 8a, receives the reception signal output to the signal line 6a, and outputs the demodulated data to the bus 26.
[0029]
Reference numeral 10 denotes a calling circuit which inputs telephone number information by a signal from the bus 26 and outputs a DTMF selection signal to the signal line 10a. Reference numeral 12 denotes an adder circuit which inputs information on the signal line 8a and information on the signal line 10a and outputs the addition result to the signal line 12a.
[0030]
Blocks 2 to 12 constitute a line interface (1) 30 for connection to the telephone line 2a (PSTN line 1). In the present embodiment, in addition to this, the line interface (2) 14 for connecting to the telephone line (PSTN line 2) 14a configured similarly to the line interface (1) 30 and the telephone line (PSTN line 3) 16a A line interface (3) 16 for connection is provided, and connection control of these line interfaces is executed by the CPU 22 via the bus 26.
[0031]
Reference numeral 18 denotes a memory circuit, which is composed of a storage element such as a memory (RAM), and stores raw information of read image data or encoded information as a work area, or reception information. Alternatively, it is used for storing the decrypted information or the like via the bus 26.
[0032]
Reference numeral 20 denotes a network card, which is connected to the Internet via a signal line 28a. Although the network hardware architecture is arbitrary, the network card 20 is composed of, for example, an Ethernet interface card.
[0033]
Reference numeral 22 denotes a CPU (central processing unit) that controls the entire facsimile gateway and executes a facsimile transmission control procedure with the facsimile device and a communication procedure between the gateways. A control program for the CPU 22 is stored in the ROM 24. The CPU 22 is connected to the above blocks via a bus 26.
[0034]
Reference numeral 24 denotes a ROM, which stores a control program for the CPU 22 for executing the communication control shown in FIG.
[0035]
Next, the operation in the above configuration will be described. 5 to 8 show a communication control procedure in the configuration of FIG. The illustrated procedure is stored in the ROM 24 as a control program for the CPU 22.
[0036]
In FIG. 5, step S0 represents the beginning of processing that is started based on power-on or reset.
[0037]
Step S2 represents the initialization of the memory 18 via the bus 26.
[0038]
In step S4, all the CML (CML1, 2, 3) of the lines 1, 2, 3 are turned off.
[0039]
In step S6, it is determined whether or not there is a reception (incoming call) from the PSTN. If the reception from the PSTN is detected, the process proceeds to step S12. If the reception from the PSTN is not detected, the process proceeds to step S8. move on.
[0040]
In step S8, it is determined whether there is a connection request for another gateway from the IP network side via the network card 20. If there is a connection request from another gateway, a TCP (or UDP) connection is established with the other gateway, and the process proceeds to step S54 in FIG. If there is no connection request from another gateway, the process proceeds to step S10 to execute other processing.
[0041]
If reception from the PSTN is detected in step S6 (hereinafter, reception from the line 2a (PSTN line 1) will be exemplified), in step S12, the line interface (1) 30 (NCU2's) is connected via the bus 26. ) The CML relay is turned on and the line 2a is connected to the hybrid circuit 6 side.
[0042]
Hereinafter, the operation to be described is an operation as an emitting (image transmission side) gateway (up to step S52).
[0043]
In step S14, the telephone number of the other party is input from the connected facsimile apparatus (hereinafter, this facsimile apparatus is referred to as a PSTN facsimile apparatus). At this time, it is assumed that the user of the PSTN side facsimile apparatus performs an operation such as double dialing and inputs the telephone number of the other party's facsimile apparatus. In this gateway, the telephone number of the destination facsimile machine transmitted by the tone signal or the like is input by this, and in step S16, the details of the technical specification for notifying the predetermined number (as mentioned above are not determined). ) To the other gateway (receiving (image receiving side) gateway).
[0044]
In step S18, a CEDInd (CED indicator) packet is received from the partner gateway by the IFP protocol. In step S20, a CED signal is transmitted to the PSTN side facsimile apparatus based on the received packet.
[0045]
Thereafter, similarly, a signal received from the partner gateway by the IFP protocol is converted into a predetermined modulation signal of the G3 protocol and transmitted to the PSTN side facsimile apparatus. The signal received from the PSTN side facsimile apparatus uses the IFP protocol for the partner gateway. Use to send. In the following, this protocol conversion will not be explained one by one unless particularly necessary to avoid complications. In addition, notations such as “→ FAX” and “← GW” shown beside each step in the flowchart indicate the signal transmission / reception direction.
[0046]
In step S22, a CSI / DIS packet (HDLC configuration) is received from the counterpart gateway based on the IFP, and subsequently, in step S24 of FIG. 6, the received CSI / DIS information is converted into an analog procedure signal and transmitted. At this time, regardless of the value of the bit 3 of the FIF of the received DIS signal, the bit 3 of the FIF of the DIS signal is set to 1, and the CSI / DIS signal is transmitted to the facsimile apparatus. That is, as described above, bit 3 of the FIF of the DIS signal indicates the presence / absence of a facsimile reception function based on ITU-T recommendation T.38, and this processing forces bit 3 of the FIF of the received DIS signal to be forced. This means that the data is transmitted to the PSTN side facsimile apparatus.
[0047]
In step S26, a TSI / DCS signal is received from the PSTN side facsimile apparatus.
[0048]
In step S28, the FSI bit 3 of the DCS signal is forcibly changed to 1 with respect to the received TSI / DCS signal (that is, facsimile transmission based on ITU-T recommendation T.38 is designated), The TSI / DCS packet is transmitted to the partner gateway based on the IFP.
[0049]
In step S30, a training / TCF signal is received from the facsimile apparatus. Thus, training is performed between the partner gateway and the partner facsimile machine, and when the training is successful, a CFR packet is transmitted from the partner gateway.
[0050]
In step S32, this CFR signal is received by IFP, and in step S34, the CFR signal is transmitted as an analog modulation signal to the PSTN side facsimile apparatus.
[0051]
In step S36, an analog-modulated image signal is received from the facsimile apparatus, and in step S38, the image signal is transmitted to the partner gateway by IFP. The image signal converted into the analog modulation signal is transmitted and received again between the partner gateway and the partner facsimile machine.
[0052]
In the present embodiment, only the transmission / reception of one document image is illustrated for the sake of simplicity.
[0053]
In step S40, an analog-modulated PPS-EOP signal is received from the PSTN side facsimile apparatus. In step S42, the PPS-EOP signal is transmitted to the gateway by IFP. In response to this, the counterpart facsimile apparatus transmits an MCF signal if the received image signal is normal, and this signal is transmitted from the counterpart gateway by IFP.
[0054]
In step S44, the MCF packet is received from the partner gateway by IFP, and in step S46, the received MCF signal is transmitted to the PSTN side facsimile apparatus.
[0055]
In step S48, the analog-modulated DCN signal is received from the facsimile apparatus. In response to this, in step S50 in FIG. 7, the DCN signal is transmitted to the partner gateway by IFP. In step S52, the line is transmitted via the bus 26. The CML relay of the NCU 2 of the interface (1) 30 is controlled to be turned off, the telephone line 2a is opened, and the process returns to step S6 in FIG.
[0056]
On the other hand, if there is a connection request for another gateway in step S8 in FIG. 5, the CML relay of the NCU2 of the line interface (1) 30 is controlled to be turned on via the bus 26 in step S54 and connected to the telephone line 2a. To do.
[0057]
The operation described below is an operation as a receiving (image receiving side) gateway.
[0058]
In step S56, the telephone number of the other party is input from the gateway (the details of the technical specifications for notifying this telephone number are not determined as described above), and in step S58, the designated PSTN side facsimile apparatus is called. To do.
[0059]
In step S60, an analog-modulated CED signal is received from the PSTN side facsimile apparatus, and in step S62, CEDInd is transmitted to the partner gateway (emitting gateway) by IFP.
[0060]
In step S64, an analog-modulated CSI / DIS signal is received from the PSTN side facsimile apparatus, and in step S66 (similar to that in steps S22 and S28), bit 3 of the DIS signal of the received CSI / DIS signal is set to bit 3. Regardless, the FIF bit 3 of the DIS signal is forcibly converted to 1 and the CSI / DIS signal is transmitted to the gateway by IFP.
[0061]
In step S68 of FIG. 8 (similar to steps S22, S28, and S64), a TSI / DCS packet is received from the counterpart gateway by IFP. In step S70, the bit 3 of the FIF of the DCS signal is received with respect to the received TSI / DCS packet. Is added forcibly to 1 and a TSI / DCS signal is transmitted to the PSTN facsimile apparatus.
[0062]
In step S72, a training / TCF signal is transmitted to the PSTN side facsimile apparatus based on the training / TCF packet received from the partner gateway.
[0063]
In step S74, the analog-modulated CFR signal is received from the PSTN side facsimile apparatus, and in step S76, the CFR signal is transmitted to the partner gateway by IFP.
[0064]
In step S78, the image signal packet is received from the counterpart gateway by IFP, and the image signal data received in step S80 is analog-modulated and transmitted to the PSTN side facsimile apparatus.
[0065]
Here, as described above, it is assumed that only one page is transmitted and received, and the PPS-EOP packet is transmitted from the counterpart gateway by the IFP, following the image signal packet.
[0066]
In step S82, a PPS-EOP packet is received from the partner gateway, and the content is transmitted as an analog-modulated PPS-EOP signal to the PSTN side facsimile apparatus in step S84.
[0067]
In step S86, the analog-modulated MCF signal is received from the PSTN side facsimile apparatus, and in step S88, the MCF signal is transmitted to the partner gateway by IFP.
[0068]
In step S90, a DCN packet is received from the partner gateway by IFP, and in step S92, an analog-modulated DCN signal is transmitted to the PSTN side facsimile apparatus.
[0069]
As described above, according to the present embodiment, in the real-time Internet facsimile communication of the emitting and receiving gateway ITU-T recommendation T.38, the bit 3 of the FIF of the DIS and DCS signals declaring the support of the communication is received. Therefore, regardless of the state of the same bit, the bit is forcibly set to 1 and exchanged with the facsimile apparatus. Therefore, the facsimile apparatus receiving the bit relayed by the gateway takes various procedures in consideration of transmission via the IP network. Control such as extending the timer length for detecting a signal can be executed. Using the real-time Internet facsimile protocol described in No. 38, there is an excellent effect that the facsimile apparatus can be communicated without terminating the communication regardless of whether it is a new model or an old model.
[0070]
In the above embodiment, one gateway forcibly converts both the FIF bit 3 of the DIS / DCS packet received from the Internet side and the FIF bit 3 of the DIS / DCS signal received from the PSTN side to 1. However, even if only one of the FIF bit 3 of the DIS / DCS packet received from the Internet side or the FIF bit 3 of the DIS / DCS signal received from the PSTN side is converted, the one-way direction is not obtained. The same effect as above can be expected. For example, when the facsimile apparatus that finally receives the relayed DIS / DCS signal is an old-type apparatus that does not interpret bit 3 of the FIF of the DIS / DCS signal, the same effect as described above is obtained.
[0071]
Further, in the above embodiment, the bit 3 of the FIF of the DIS / DCS signal is illustrated for simplicity of explanation, but the same control is possible for the bit 3 of the FIF of the DTC signal. Needless to say, the effect can be expected.
[0072]
Further, as described above, the gateway device of this embodiment can be configured as a dedicated facsimile device having a network interface and a PSTN interface, or from a computer system having a similar communication interface. The control program for the gateway device according to the present embodiment can be supplied to the gateway device via another arbitrary computer-readable medium in addition to being stored in the ROM 24 in advance.
[0073]
The ITU-T recommendation T.I. The real-time Internet facsimile protocol described in No. 38 has many undecided details, and there is a possibility that the procedure signal including a bit relating to whether or not real-time Internet facsimile communication is supported will be increased or decreased, or that the bit position may be changed. However, the technique of the present invention is applied to the procedure signal and its bit position after the change even if the above procedure signal and its bit position are changed from bit 3 of the above-mentioned DIS / DCS / DTC signal FIF. Needless to say, you can. In short, the bit relating to the presence or absence of support for real-time Internet facsimile communication in the procedure signal received from the partner gateway or facsimile apparatus using the Internet facsimile protocol or G3 procedure is forcibly converted to a state where real-time Internet facsimile communication is supported, What is necessary is just to transmit to a facsimile machine or the other party gateway by a procedure or an internet facsimile protocol.
[0074]
【The invention's effect】
As is apparent from the above, according to the present invention, a facsimile gateway for performing real-time Internet facsimile communication compliant with ITU-T Recommendation T.38, a control method thereof, and a control program thereof, the Internet facsimile protocol from a partner gateway or a facsimile machine can be used. Alternatively, a bit related to whether or not real-time Internet facsimile communication is supported in the procedure signal received by the G3 procedure is forcibly converted to a state in which real-time Internet facsimile communication is supported, and then transmitted to the facsimile apparatus or the other gateway by the G3 procedure or Internet facsimile protocol. Since the transmission configuration is adopted, the facsimile apparatus that receives the bit relayed by the gateway is the IP network. In consideration of transmission via the network, control such as extending the timer length for detecting various procedure signals can be executed. Using the real-time Internet facsimile protocol described in No. 38, there is an excellent effect that the facsimile apparatus can be communicated without terminating the communication regardless of whether it is a new model or an old model.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a facsimile communication system based on ITU-T recommendation T.38.
FIG. 2 is an explanatory diagram showing a state of communication in the configuration of FIG. 1;
FIG. 3 is an explanatory diagram showing a state of communication in the configuration of FIG. 1;
FIG. 4 is a block diagram showing a configuration of a facsimile gateway employing the present invention.
FIG. 5 is a flowchart showing a communication control procedure in the configuration of FIG. 4;
6 is a flowchart showing a communication control procedure in the configuration of FIG.
7 is a flowchart showing a communication control procedure in the configuration of FIG.
8 is a flowchart showing a communication control procedure in the configuration of FIG.
FIG. 9 is an explanatory diagram showing problems in a facsimile communication system based on the conventional ITU-T recommendation T.38.
10 is an explanatory diagram showing problems in a facsimile communication system based on a conventional ITU-T recommendation T.38.
11 is an explanatory diagram showing an outline of facsimile communication based on ITU-T recommendation T.38 in the present invention.
[Explanation of symbols]
2 NCU
6 Hybrid circuit
8 modem
10 Calling circuit
12 Adder circuit
14 Line interface (2)
16 Line interface (3)
18 memory
20 Network card
22 CPU
24 ROM
30 Line interface (1)

Claims (6)

In a facsimile gateway that performs real-time Internet facsimile communication compliant with ITU-T Recommendation T.38,
A bit related to the presence or absence of support for real-time Internet facsimile communication in the procedure signal received from the partner gateway or facsimile apparatus by the Internet facsimile protocol or G3 procedure is forcibly converted to a state with support for real-time Internet facsimile communication, and then the G3 procedure or Internet A facsimile gateway comprising control means for transmitting to a facsimile machine or a partner gateway by a facsimile protocol. 2. The facsimile gateway according to claim 1, wherein the procedure signal is one of a DIS / DCS / DTC signal, and a bit related to whether or not the real-time Internet facsimile communication is supported is bit 3 of FIF of the signal. . In a method for controlling a facsimile gateway that performs real-time Internet facsimile communication in accordance with ITU-T Recommendation T.38,
A bit related to the presence or absence of support for real-time Internet facsimile communication in the procedure signal received from the partner gateway or facsimile apparatus by the Internet facsimile protocol or G3 procedure is forcibly converted to a state with support for real-time Internet facsimile communication, and then the G3 procedure or Internet A control method of a facsimile gateway, comprising a control step of transmitting to a facsimile apparatus or a partner gateway by a facsimile protocol. 4. The facsimile gateway according to claim 3, wherein the procedure signal is any one of a DIS / DCS / DTC signal, and a bit relating to whether or not the real-time Internet facsimile communication is supported is bit 3 of FIF of the signal. Control method. In a control program for a facsimile gateway that performs real-time Internet facsimile communication conforming to ITU-T Recommendation T.38, a bit relating to whether or not a real-time Internet facsimile communication is supported in a procedure signal received from an opposite gateway or facsimile apparatus by the Internet facsimile protocol or G3 procedure A control program for a facsimile gateway characterized by including a control step of forcibly converting the information into a state in which real-time Internet facsimile communication is supported and then transmitting it to the facsimile apparatus or the other gateway by the G3 procedure or Internet facsimile protocol. 6. The facsimile gateway according to claim 5, wherein the procedure signal is any one of a DIS / DCS / DTC signal, and a bit relating to whether or not the real-time Internet facsimile communication is supported is bit 3 of FIF of the signal. Control program.

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