JP2024032351A - Facsimile machine, facsimile machine control method, and program - Google Patents

Abstract

The present invention provides a facsimile device that performs IP facsimile communication, a method of controlling the facsimile device, and a program. [Solution] An IPFA transmitter sends a DCS signal for IPFAX transmission to a communication partner machine, monitors whether a CFR signal, which is a response signal to the DCS signal, is received from the communication partner machine, and transmits the CFR signal. Based on what is received from the other party's machine, it is determined whether to continue IPFAX transmission. The IPFAX transmitter performs control to extend the monitoring time for monitoring the CFR signal from a time determined based on a predetermined specified time as the retransmission interval time T4. [Selection diagram] Figure 6

Description

The present invention relates to a facsimile machine, a facsimile machine control method, and a program, and more particularly to a facsimile machine that performs IP facsimile communication, a facsimile machine control method, and a program.

In recent years, with the spread of the Internet and IP telephones, a method of using an IP network as a communication route for facsimile (hereinafter referred to as "FAX") communication has been established. A call control protocol for creating, changing, and disconnecting sessions for real-time communication, such as SIP (Session Initiation Protocol), has been standardized. In addition, T.30 converts G3FAX (T.30) signals into IP messages over an IP network and transmits them in real time. 38 have been made recommendations. SIP and T. Gateway devices (hereinafter referred to as "T.38GW") and IPFAX devices that comply with the T.38 Recommendation perform FAX communications on an IP network.

The IPFAX device communicates with other IPFAX devices in the IP network (route A in FIG. 8) and with T. Communication with the G3 FAX device on the analog network via the 38GW (route B in FIG. 1) is possible. The content of processing differs between communication between IPFAX devices and communication between an IPFAX device and a G3FAX device. For example, in communication between an IPFAX device and a G3FAX device, before starting image transmission, a TCF signal is sent from the G3FAX device to the TCF signal to confirm whether the image can be transmitted without causing a transmission error. It is sent to 38GW. If the detection timing that takes into account the presence or absence of TCF signal transmission and the TCF signal transmission time does not match between the sending and receiving sides, the subsequent signal may not be detected and fax communication may not be able to continue. be. Therefore, the IPFAX device needs to determine whether the communication partner is a G3 FAX device or an IPFAX device, and perform appropriate control according to the determined result.

By the way, T. In the 38 Recommendation, regulations regarding communication between IPFAX devices were added in the 2000s, and for IPFAX devices developed since then, the above regulations are required to determine whether the communication partner is a G3 FAX device or an IPFAX device. It is carried out according to the following. On the other hand, in IPFAX devices developed before the above regulations were added, whether the communication partner is a G3 FAX device or an IPFAX device is determined according to settings specific to the IPFAX device, such as network settings and destination list.

Japanese Patent Application Publication No. 2013-126148

As described above, when IPFAX devices that use different communication partner determination methods perform IPFAX communication, a communication error may occur. For example, T. IPFAX devices compatible with the T.38 new recommendation, and the T.38 new recommendation before the above regulations were added. When IPFAX transmission is performed to an IPFAX device that supports the 38 old recommendation, the following problems occur. For example, if the sending IPFAX device is T. Even if a DCS signal with a setting indicating communication between IPFAX devices is sent to the receiving IPFAX device according to the new recommendation of IPFAX No. 38, the receiving IPFAX device cannot interpret this setting. For this reason, the IPFAX device on the receiving side cannot accurately determine whether the communication partner is a G3FAX device or an IPFAX device, and may misidentify that the communication partner is a G3FAX device. . In this case, the receiving IPFAX device receives T. Considering the transmission of the TCF signal to the 38 GW, the CFR signal, which is a response signal, is sent to the transmitting side IPFAX device with a delay of the time required for this communication (for example, FIG. 9(1)). On the other hand, since the communication is between IPFAX devices, the IPFAX device on the sending side does not take into consideration the transmission time of the TCF signal, but during the monitoring time determined based on the predetermined time period T4 as the DCS signal retransmission interval time. The CFR signal is monitored (for example, (2) in FIG. 9). As a result, the IPFAX device on the sending side cannot receive the CFR signal within the monitoring time, resulting in a communication error (for example, (3) in FIG. 9).

The object of the present invention is that T. An object of the present invention is to provide a mechanism capable of suppressing the occurrence of communication errors when performing IPFAX transmission to an IPFAX device that does not comply with the new recommendations of IPFAX No. 38.

To achieve the above object, a facsimile device of the present invention is a facsimile device that transmits a predetermined control signal for performing IPFAX transmission to a communication partner, and transmits a response signal to the predetermined control signal to the communication partner. monitoring means for monitoring whether the response signal has been received from the communication partner machine; means for deciding whether to continue the IPFAX transmission according to the fact that the response signal has been received from the communication partner machine; The present invention is characterized by comprising a control means for extending the retransmission interval time from a time determined based on a predetermined specified time as the retransmission interval time.

According to the invention, T. It is possible to suppress the occurrence of communication errors when performing IPFAX transmission to an IPFAX device that does not comply with the new recommendation.

FIG. 1 is a configuration diagram schematically showing the hardware configuration of an IPFAX device as a facsimile device according to the present embodiment. FIG. 2 is a sequence diagram showing a procedure when the IPFAX device of FIG. 1 performs FAX transmission to another IPFAX device. 2 is a flowchart showing a procedure of FAX transmission control processing executed in the IPFAX apparatus of FIG. 1. FIG. 4 is a flowchart showing the procedure of DCS/TCF transmission processing in step S103 in FIG. 3. FIG. 4 is a flowchart showing the procedure of T4 setting processing in step S104 of FIG. 3. FIG. FIG. 2 is a sequence diagram showing a procedure when the IPFAX device of FIG. 1 performs FAX transmission to another IPFAX device. 6 is a flowchart showing another procedure of the T4 setting process of FIG. 5. FIG. FIG. 3 is a diagram for explaining a communication path of an IPFAX device. T. FIG. 2 is a diagram for explaining a communication error that occurs during IPFAX transmission to an IPFAX device that does not comply with the New Recommendation.

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

FIG. 1 is a configuration diagram schematically showing the hardware configuration of an IPFAX device 100 as a facsimile device according to the present embodiment.

In FIG. 1, the IPFAX device 100 includes a CPU 101, a ROM 102, a RAM 103, an HDD 104, a panel operation I/F 105, and an operation panel 106. The IPFAX device 100 also includes a scanner I/F 107, a scanner 108, a printer I/F 109, a printer 110, and a network I/F 111. The CPU 101, ROM 102, RAM 103, HDD 104, panel operation I/F 105, scanner I/F 107, printer I/F 109, and network I/F 111 are connected to each other via a system bus 112.

The CPU 101 centrally controls each component connected to the system bus 112 based on a control program stored in the ROM 102 or HDD 104. The ROM 102 stores control programs and the like that can be executed by the CPU 101. The RAM 103 functions as the main memory, work area, etc. of the CPU 101, and the memory capacity can be expanded by an optional RAM connected to an expansion port (not shown). The HDD 104 stores boot programs, various applications, font data, user files, editing files, and the like.

An operation panel 106 configured with a touch panel type display, a plurality of operation keys, etc. is connected to the panel operation I/F 105. The panel operation I/F 105 controls displaying various information on the operation panel 106, and also transfers information input to the operation panel 106 to the CPU 101. A scanner 108 that reads a set original and generates image data of the original is connected to the scanner I/F 107. Scanner I/F 107 outputs image data generated by scanner 108 to ROM 102, HDD 104, and the like. A printer 110 that prints image data generated by the scanner 108 on paper is connected to the printer I/F 109. The printer I/F 109 outputs image data to be printed to the printer 110. The network I/F 111 is an expansion card such as a NIC for connecting the IPFAX device 100 to a network.

In this embodiment, IPFAX device 100 is connected to intranet 113, as shown in FIG. The IPFAX device 100 performs IPFAX communication with an IPFAX device 114 on the intranet 113.

Further, in this embodiment, the intranet 113 is T. It is connected to a public analog network 116 via a 38GW 115. Note that GW is an abbreviation for Gateway. T. 38GW115 supports SIP and T. This is a gateway device that complies with the 38 Recommendation. In this embodiment, the intranet 113 converts the analog network call connection procedure to SIP and performs connection processing, and the T. 38GW115 is T. 30 fax procedures to T. 38 fax procedure and perform communication. In this way, the IPFAX device 100 connects the G3FAX 117 connected to the public analog network 116 and the T. IPFAX communication is performed via the 38GW115.

FIG. 2 is a sequence diagram showing a procedure when the IPFAX device 100 of FIG. 1 performs FAX transmission to the IPFAX device 114. In the description of FIG. 2, in order to make the content easier to understand, the IPFAX device 100 is assumed to be the sending side IPFAX device 100, and the IPFAX device 114 is assumed to be the receiving side IPFAX device 114. Note that the IPFAX device 114 is compatible with the T. T.38 does not correspond to the new recommendation and this provision has not been added. This device complies with the old Recommendation No. 38.

In FIG. 2, first, the sending-side IPFAX device 100 sends a session establishment request (INVITE) to the receiving-side IPFAX device 114 (T101).

The IPFAX device 114 on the receiving side sends a success response (200 OK) indicating that a call is possible to the IPFAX device 100 on the transmitting side as a response to the received session establishment request (INVITE) (T102).

When receiving the success response (200 OK), the transmitting side IPFAX device 100 sends an ACK indicating that the success response (200 OK) has been received to the receiving side IPFAX device 114 (T103). As a result, a session of the media type audio is established between the IPFAX device 100 on the sending side and the IPFAX device 114 on the receiving side. After the audio session is established, the IPFAX device 114 on the receiving side sends a session switching request (reINVITE) to switch the session to a session with the media type image to the IPFAX device 100 on the transmitting side (T104).

The IPFAX device 100 on the sending side sends a success response (200 OK) to the IPFAX device 114 on the receiving side as a response to the received session switching request (reINVITE) (T105).

When the receiving-side IPFAX device 114 receives the success response (200 OK), it sends an ACK indicating that the success response (200 OK) has been received to the transmitting-side IPFAX device 100 (T105). As a result, an image session is established between the IPFAX device 100 on the sending side and the IPFAX device 114 on the receiving side. When the image session is established, the SIP connection is completed, and T. Communication compatible with the 38 Recommendation becomes possible.

Thereafter, the IPFAX device 114 on the receiving side sends a DIS signal for declaring IPFAX capability indicating that it is an IPFAX device to the IPFAX device 100 on the transmitting side (T107).

The sending-side IPFAX device 100 that has received the DIS signal sends a DCS signal, which is a predetermined control signal for performing IPFAX transmission, to the receiving-side IPFAX device 114 (T108). The DCS signal is a signal for notifying the format of data actually sent, and has a predetermined setting indicating that communication is between IPFAX devices. Specifically, the IPFAX capability bit is set to "1" and the modulation mode bit is set to "0".

Here, as described above, the IPFAX device 114 on the receiving side is a T. 38 without responding to the new recommendations, T. Since the device is compatible with the old Recommendation No. 38, it cannot interpret the above-mentioned predetermined settings in the received DCS signal. Therefore, the IPFAX device 114 on the receiving side cannot accurately determine whether the communication partner is a G3FAX device or an IPFAX device, and may misidentify that the communication partner is a G3FAX device. be. In this case, the IPFAX device 114 on the receiving side receives T. Considering the transmission of the TCF signal to the 38GW 115, the CFR signal is delayed by the time required for this communication and is sent to the IPFAX device 100 on the transmitting side (T109).

On the other hand, the IPFAX device 100 on the transmitting side starts monitoring the CFR signal after outputting the DCS signal. The IPFAX device 100 on the sending side extends the DCS signal retransmission interval time T4 to extend the CFR signal monitoring time (T110).

FIG. 3 is a flowchart showing the procedure of FAX transmission control processing executed in the IPFAX apparatus 100 of FIG. The FAX transmission control process in FIG. 3 is realized by the CPU 101 executing a program stored in the ROM 102. In the FAX transmission control process in FIG. 3, a case where the IPFAX device 100 performs FAX transmission to the IPFAX device 114 will be described as an example. In the explanation of FIG. 3, in order to make the content easier to understand, the IPFAX device 100 is assumed to be the sending side IPFAX device 100, and the IPFAX device 114 is assumed to be the receiving side IPFAX device 114.

In FIG. 3, first, the CPU 101 waits until the SIP connection is completed. When the SIP connection is completed (YES in step S101), the CPU 101 waits until it receives a DIS signal from the IPFAX device 114 on the receiving side. Upon receiving the DIS signal from the receiving side IPFAX device 114 (YES in step S102), the CPU 101 performs the DCS/TCF transmission process shown in FIG. 4 (step S103).

FIG. 4 is a flowchart showing the procedure of the DCS/TCF transmission process in step S103 of FIG.

In FIG. 4, the CPU 101 determines whether the communication partner is an IPFAX device based on the received DIS signal (step S201).

If it is determined in step S201 that the communication partner is an IPFAX device, the process advances to step S202. In step S202, the CPU 101 sends a DCS signal with predetermined settings indicating that communication is between IPFAX devices to the receiving side IPFAX device 114, which is the communication partner. In this DCS signal, the IPFAX capability bit is set to "1" and the modulation mode bit is set to "0" as described above. Next, the process advances to step S204, which will be described later.

In step S201, the communication partner is not an IPFAX device, that is, the communication partner is a T. If it is determined that the device is a G3 FAX device that communicates via the G38GW, the process advances to step S203. In step S203, the CPU 101 sends a DCS signal with other settings that do not indicate communication between IPFAX devices to the receiving side IPFAX device 114, which is the communication partner. In this DCS signal, the IPFAX capability bit is set to "0" and the modulation mode bit is set to the modem modulation mode according to the received DIS signal. Next, the process advances to step S204, which will be described later.

In step S204, T. It is determined whether the transport protocol used in the T.38 procedure is TCP or UDP. Note that UDP is a simpler protocol than TCP, and does not have a function of detecting, for example, errors in transmitted and received data or differences in order. In step S204, T. If it is determined that the T.38 transport protocol is UDP, the CPU 101 sends a TCF signal to the receiving side IPFAX device 114 to confirm whether transmission is possible without causing a transmission error (step S205). The TCF signal is transmitted at the transmission rate that actually transmits the image before transmitting the image. After that, the DCS/TCF transmission process ends.

In step S204, T. If it is determined that the transport protocol used in the T.38 procedure is TCP, the CPU 101 does not send the TCF signal to the receiving side IPFAX device 114, and the DCS/TCF transmission process ends. After that, the process proceeds to S104 in FIG. 3. In step S104, the CPU 101 performs the T4 setting process of FIG. 5 to set the retransmission interval time T4 of the DCS signal.

FIG. 5 is a flowchart showing the procedure of the T4 setting process in step S104 in FIG. In FIG. 5, the CPU 101 determines whether the DCS signal retransmission process is due to a timeout error of the retransmission interval time T4 (step S301).

If it is determined in step S301 that the retransmission process is not due to a timeout error of the retransmission interval time T4, the process proceeds to step S302. In step S302, the CPU 101 sets the retransmission interval time T4 to a first time that is extended by a predetermined time from the specified time that is predetermined as the retransmission interval time T4. As an example, a case will be described in which the specified time for the retransmission interval time T4 is predetermined to be 3 seconds. In this case, in step S302, the CPU 101 sets the retransmission interval time T4 to a predetermined time, for example, 6 seconds, which is extended from the specified time of 3 seconds by 3 seconds corresponding to the specified time. Further, the CPU 101 starts measuring time. Thereafter, the T4 setting process ends, and the process proceeds to step S105 in FIG.

If it is determined in step S301 that the DCS signal retransmission process is due to a timeout error of the retransmission interval time T4, the process proceeds to step S303. In step S303, the CPU 101 sets the retransmission interval time T4 to a second time (for example, 8 seconds) that is longer than the specified time (for example, 3 seconds). In this manner, in the present embodiment, control is performed to extend the monitoring time for monitoring the CFR signal beyond the time determined based on the prescribed time determined in advance as the retransmission interval time T4. Next, the CPU 101 starts measuring time. Thereafter, the T4 setting process ends, and the process proceeds to step S105 in FIG. 3. In step 105, the CPU 101 determines whether a retransmission interval time T4 has elapsed (hereinafter simply referred to as "timeout") after starting time measurement.

If it is determined in step S105 that there is no timeout, the CPU 101 determines whether or not a CFR signal has been received (step S106). If it is determined in step S106 that no CFR signal is received, the process returns to step S105. In step S106, if it is determined that the CFR signal has been received, the CPU 101 transmits the T. The IP FAX transmission according to the No. 38 procedure is continued (step S107). Thereafter, the image is transmitted by IPFAX to the communication partner machine, and when the IPFAX transmission of the image is completed, the FAX transmission control process ends.

If it is determined in step S105 that a timeout has occurred, the CPU 101 determines whether or not the DCS signal has been sent three times (step S108). If it is determined in step S108 that the DCS signal will not be transmitted three times, the process returns to step S103, and retransmission processing of the DCS signal is performed. If it is determined in step S108 that the DCS signal has been sent three times, there is no response from the communication partner, so the CPU 101 performs error retransmission settings (step S109), interrupts IPFAX transmission, and performs FAX transmission control processing. ends.

According to the embodiment described above, control is performed to extend the monitoring time for monitoring the CFR signal from a time determined based on a predetermined prescribed time as the retransmission interval time T4. As a result, T. Even if the IPFAX device 114 on the receiving side that does not comply with the 38 New Recommendation misidentifies the communication partner and sends out a CFR signal with a delay of the time required for TCF signal communication, the IPFAX device 100 on the transmitting side will not be able to send this CFR signal. can be detected. As a result, CFRT. Accordingly, it is possible to suppress the occurrence of communication errors when performing IPFAX transmission to the IPFAX device 114 that does not comply with the new recommendation.

Furthermore, in the embodiment described above, the retransmission interval time T4 is set to a time that is extended by a predetermined amount of time from the specified time that is predetermined as the retransmission interval time T4. Thereby, monitoring of the CFR signal can be continued for a time longer than the specified time.

In the embodiment described above, since the predetermined time is the specified time, monitoring of the CFR signal can be continued for as long as the specified time.

In the embodiment described above, the predetermined control signal is a DCS signal for notifying the format of data actually sent. As a result, CFRT. When performing IPFAX transmission with an IPFAX device that does not comply with the new recommendation of V.38, it is possible to suppress the occurrence of communication errors due to inability to receive a CFR signal, which is a response signal to a DCS signal.

Furthermore, in the embodiment described above, the communication partner device is an IPFAX device that cannot interpret a predetermined setting made in the DCS signal indicating that communication is between IPFAX devices. Thereby, it is possible to suppress the occurrence of a communication error when performing IPFAX transmission to an IPFAX device that cannot interpret a predetermined setting indicating that communication is between IPFAX devices.

Although the present invention has been described above using the embodiments described above, the present invention is not limited to the embodiments described above. For example, the retransmission interval time T4 may be set to a longer time depending on the number of times the DCS signal is retransmitted.

FIG. 6 is a sequence diagram showing a procedure when the IPFAX device 100 of FIG. 1 performs FAX transmission to the IPFAX device 114. In the explanation of FIG. 6 as well, in order to make the content easier to understand, the IPFAX device 100 is assumed to be the sending side IPFAX device 100, and the IPFAX device 114 is assumed to be the receiving side IPFAX device 114. Note that also in FIG. 6, the IPFAX device 114 is T. 38 without responding to the new recommendations, T. This will be explained as a device that complies with the old Recommendation No. 38. Note that the sequence diagram in FIG. 6 has similar content to the sequence diagram in FIG. 2, and the content that is different from the sequence diagram in FIG. 2 will be particularly explained below.

In FIG. 6, first, T201 to T208, which are the same processes as T101 to T108, are performed. Next, after outputting the DCS signal, the sending-side IPFAX device 100 starts monitoring the CFR signal, and receives the DCS signal after the retransmission interval time T4 set as the above-mentioned specified time (for example, 3 seconds) has elapsed. It is retransmitted to the IPFAX device 114 on the side (T210). After retransmitting the DCS signal, the IPFAX device 100 on the transmitting side sets the retransmission interval time T4 from when the next DCS signal is retransmitted (T211) to a time longer than the specified time (for example, 5 seconds). Thereafter, the sending-side IPFAX device 100 monitors the CFR signal by setting the retransmission interval time T4 to a longer time depending on the number of times the DCS signal is retransmitted.

FIG. 7 is a flowchart showing another procedure of the T4 setting process of FIG. The T4 setting process in FIG. 7 is realized by the CPU 101 executing a program stored in the ROM 102, similar to the T4 setting process in FIG.

In FIG. 7, the CPU 101 sets the retransmission interval time T4 to a longer time depending on the number of times the DCS signal is retransmitted. Specifically, the CPU 101 sets the retransmission interval time T4 to the third time represented by the specified time + 2n (step S401). Note that n indicates the number of times the DCS signal is retransmitted. After completing the process of step S401, the CPU 101 starts counting time. Thereafter, the T4 setting process ends, and the process proceeds to step S105 in FIG.

In step S401, for example, when the number of retransmission processing of the DCS signal is one, that is, in the second transmission of the DCS signal, the CPU 101 sets the retransmission interval time T4 until the transmission of the next DCS signal to 5. Set to seconds (regular time (for example, 3 seconds) + 2×1). In addition, when the number of retransmission processing of the DCS signal is two times, that is, in the third transmission of the DCS signal, the CPU 101 sets the retransmission interval time T4 until the transmission of the next DCS signal to 7 seconds (specified time (for example, 3 seconds)+2×2). In this way, each time the number of times the DCS signal is transmitted increases, the retransmission interval time T4 is set to a longer time, so that the monitoring time of the CFR signal, which is a response signal to the DCS signal, becomes longer depending on the number of times the DCS signal is transmitted. It can be extended for a long time.

Further, when the number of retransmission processing of the DCS signal is 0, that is, in the first transmission of the DCS signal, the CPU 101 sets the retransmission interval time T4 until the transmission of the next DCS signal to a specified time (for example, 3 seconds). Note that in this embodiment, as an example, the retransmission interval time T4 is set to a specified time in the first transmission of the DCS signal, but the present invention is not limited to this configuration. For example, in the first transmission of the DCS signal, the retransmission interval time T4 until the transmission of the next DCS signal may be set to a time that is extended by a predetermined time from the specified time. In such a configuration, the third time is a time represented by the prescribed time+predetermined time+2n.

The present invention provides a system or device with a program that implements one or more functions of the embodiments described above via a network or a storage medium, and one or more processors in a computer of the system or device reads the program. It can also be realized by executing processing. The present invention can also be implemented by a circuit (eg, an ASIC) that implements one or more functions.

Note that the disclosure of this embodiment includes the following configuration and method.
(Configuration 1) A facsimile device that transmits a predetermined control signal for performing IPFAX transmission to a communication partner machine, comprising a monitoring unit that monitors whether a response signal to the predetermined control signal is received from the communication partner machine. , a means for determining the continuation of the IPFAX transmission in accordance with the reception of the response signal from the communication partner, and a monitoring time by the monitoring means being a prescribed time predetermined as the retransmission interval time of the predetermined control signal. 1. A facsimile apparatus comprising: control means for extending the time beyond the time determined based on the facsimile apparatus.
(Configuration 2) The facsimile apparatus according to Configuration 1, wherein the control means sets the retransmission interval time to a time that is extended by a predetermined time from the specified time.
(Structure 3) The facsimile apparatus according to Structure 2, wherein the predetermined time is the specified time.
(Configuration 4) The facsimile according to any one of configurations 1 to 3, wherein the control means sets the retransmission interval time to a longer time each time the number of transmissions of the predetermined control signal increases. Device.
(Structure 5) The facsimile apparatus according to any one of Structures 1 to 4, wherein the predetermined control signal is a DCS signal for notifying the format of data actually sent.
(Configuration 6) The communication partner device is a facsimile device that cannot interpret a predetermined setting made in the predetermined control signal indicating that communication is between IP facsimile devices. The facsimile machine according to any one of configurations 1 to 5.

100 IPFAX device 114 IPFAX device 101 CPU

Claims (8)

A facsimile device that transmits a predetermined control signal for performing IPFAX transmission to a communicating party,
monitoring means for monitoring whether a response signal to the predetermined control signal is received from the communication partner;
means for determining the continuation of the IPFAX transmission in accordance with the reception of the response signal from the communication partner;
A facsimile apparatus comprising: a control means for extending the monitoring time by the monitoring means from a time determined based on a predetermined time as a retransmission interval time of the predetermined control signal. 2. The facsimile apparatus according to claim 1, wherein the control means sets the retransmission interval time to a time that is extended by a predetermined amount of time from the specified time. 3. The facsimile apparatus according to claim 2, wherein the predetermined time is the specified time. 2. The facsimile apparatus according to claim 1, wherein the control means sets the retransmission interval time to a longer time each time the number of times the predetermined control signal is transmitted increases. 2. The facsimile apparatus according to claim 1, wherein the predetermined control signal is a DCS signal for notifying the format of data to be actually sent. 1. The communication partner device is an IP facsimile device that cannot interpret a predetermined setting made in the predetermined control signal indicating that communication is between IP facsimile devices. The facsimile machine described in . A method for controlling a facsimile device that transmits a predetermined control signal for performing IPFAX transmission to a communicating party, the method comprising:
a monitoring step of monitoring whether a response signal to the predetermined control signal has been received from the communication partner;
determining the continuation of the IPFAX transmission in accordance with the reception of the response signal from the communication partner;
A method for controlling a facsimile apparatus, comprising: a control step of extending the monitoring time in the monitoring step from a time determined in advance based on a prescribed time period determined in advance as a retransmission interval time of the predetermined control signal. A program that causes a computer to execute a method for controlling a facsimile machine that transmits a predetermined control signal for performing IPFAX transmission to a communication partner machine, the program comprising:
The method for controlling the facsimile device includes:
a monitoring step of monitoring whether a response signal to the predetermined control signal has been received from the communication partner;
determining the continuation of the IPFAX transmission in accordance with the reception of the response signal from the communication partner;
A program comprising: a control step for extending the monitoring time in the monitoring step from a time determined based on a predetermined time period predetermined as a retransmission interval time of the predetermined control signal.

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