JP2008228219A - Data communication terminal, data communication method, data communication program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data communication terminal, a data communication method, a data communication program, and a recording medium, for simplifying the program and reducing required memory size without requiring a user to set the speed in IP communication. <P>SOLUTION: The data communication terminal has a connection means for connecting to an IP network, a determination means for determining an available band from voice codec type, and a control means for controlling the band to be used in data communication connection after voice connection. The control means determines the available network band in data communication from the voice codec type used for voice connection and controls the band to be used for data communication. For example, the determination means in a receiver terminal determines the available network band, the control means sets a data signal rate of digital identifying signal so that the network band is narrower than the network band and transmits it to a caller terminal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a data communication terminal, a data communication method, a data communication program, and a recording medium when communicating via an IP network.

Japanese Patent Application Laid-Open No. 2004-133830 discloses a method for enabling registration of a communication destination and a network band when performing IP network communication so that other communication is not adversely affected by a user changing the network. Are listed.
JP 2005-269014 A

  There are cases in which specific offices are connected by a narrow band (128 Kbps) network in the corporate network. IP telephone communication in such an environment is, for example, a voice codec G.264. 711 (used bandwidth: 64 Kbps), in many cases, the G. 729 (bandwidth used: 8 Kbps) is employed. Similar to voice communication, data packet communication needs to be sent at a low communication speed such as 9600 bps so as not to affect IP telephone and data communication. However, at present, the communication speed is reduced for all communication. It is necessary to set. Also, depending on the network usage status (network availability), even when communication can be performed at a high communication speed, the communication speed remains low, and it is not possible to increase the communication speed.

  The present invention has been made in consideration of such problems, and there is no need for the user to set the communication speed in IP communication, the data communication terminal that can simplify the program and reduce the required memory amount, An object is to provide a data communication method, a data communication program, and a recording medium.

  The data communication terminal according to the first aspect of the present invention is a connection means capable of connecting to an IP network, a determination means for determining an available bandwidth from a voice codec type, and a bandwidth used in a data communication connection to be connected following the voice connection. Control means for determining the network bandwidth that can be used for data communication from the type of voice codec used for voice connection, and controlling the bandwidth used for data communication.

  The invention according to claim 2 is the data communication terminal according to claim 1, wherein the determining means in the called terminal determines a usable network bandwidth, and the control means has a network bandwidth smaller than the network bandwidth. Thus, the data signal speed of the digital identification signal is set and transmitted to the calling terminal.

  A third aspect of the present invention is the data communication terminal according to the first aspect, wherein the determination unit in the calling terminal determines a usable network band, and the control unit has a network band smaller than the network band. Thus, the data signal rate of the digital command signal is set to control the transmission of the image data packet.

  According to a fourth aspect of the present invention, there is provided the data communication terminal according to the first aspect, wherein when a communication error is detected, an error notification for urging to reduce the communication speed is performed.

  The invention according to claim 5 is the data communication terminal according to claim 1, wherein a destination can be set, and when a communication error occurs, a communication speed parameter in a parameter for each set destination is set. It is characterized by slowing down.

  The invention according to claim 6 is the data communication terminal according to claim 1, wherein the destination can be set and the number of times of communication to the addressed work is counted, and the number of times of normal communication is determined. Then, a communication speed faster than the current communication speed is written in the communication parameters stored for each destination, and the next communication is performed at the high communication speed.

  The invention according to claim 7 is the data communication terminal according to claim 5, wherein the communication parameter can be changed for each destination, and the office number or the IP address of the calling side destination FAX number can be used for the same network. In addition to determining whether it is a destination, it is also determined whether it is a destination on the same network from the network address of the call destination. The speed parameter in the parameter is set to be slow.

  The invention according to claim 8 is the data communication terminal according to claim 6, wherein the calling side terminal is an ITU-T recommendation T.30. 38 IAF, and the called terminal connected to the calling terminal is ITU-T recommendation T.38. In the case of analog FAX via 38 gateways, the upper limit speed for increasing the communication speed is set to the data signal speed of the digital command signal as the communication speed declared by the analog FAX, and transmitted to the called terminal.

  The invention according to claim 9 is the data communication terminal according to claim 1, wherein when the calling terminal determines that the call is made from a specific network, the control means sets the specific network. A data signal speed is set in the digital identification signal so that communication is performed at a communication speed, and the data is transmitted to the calling terminal to control the communication band.

  A tenth aspect of the present invention is the data communication terminal according to the first aspect, wherein when the call is received from the calling side terminal, the control means has the same destination as the registered destination information, and communication from the destination is performed. When the communication speed of the communication error history is stored, the data signal speed at which the communication speed becomes slow is set in the digital identification signal and transmitted to the partner machine.

  The data communication method according to an eleventh aspect of the present invention controls a connection step for connecting to an IP network, a determination step for determining an available bandwidth from a voice codec type, and a use bandwidth in a data communication connection to be connected subsequent to the voice connection. And a control step, wherein the network bandwidth usable for data communication is determined from the voice codec type used for voice connection, and the bandwidth used for data communication is controlled.

  The invention according to claim 12 is the data communication method according to claim 11, wherein in the determination step in the called terminal, an available network bandwidth is determined, and in the control step, a network bandwidth smaller than the network bandwidth is determined. Thus, the data signal speed of the digital identification signal is set and transmitted to the calling terminal.

  A thirteenth aspect of the present invention is the data communication method according to the eleventh aspect, wherein the determining means in the calling terminal determines a usable network bandwidth, and the control step results in a network bandwidth smaller than the network bandwidth. Thus, the data signal rate of the digital command signal is set to control the transmission of the image data packet.

  According to a fourteenth aspect of the present invention, in the data communication method according to the eleventh aspect, when a communication error is detected, an error notification that prompts the communication speed to be reduced is performed.

  The invention according to claim 15 is the data communication method according to claim 11, wherein communication parameters can be set for each destination, and when a communication error occurs, The communication speed parameter is slowed down.

  The invention according to claim 16 is the data communication method according to claim 11, wherein communication parameters can be set for each destination, and the number of times of communication to the addressed work is counted, so that normal communication is determined. When the number of times reached, the communication speed faster than the current communication speed is written in the communication parameter stored for each destination, and the next communication is performed at the high communication speed.

  The invention according to claim 17 is the data communication terminal according to claim 15, wherein the communication parameter can be changed for each destination, and the office number or IP address of the calling side destination FAX number can be used for the same network. In addition to determining whether it is a destination, it is also determined whether it is a destination on the same network from the network address of the call destination. The speed parameter in the parameter is set to be slow.

  The invention according to claim 18 is the data communication terminal according to claim 16, wherein the calling side terminal is an ITU-T recommendation T.30. 38, the callee terminal connected to the caller terminal is ITU-T Recommendation T.36. When the analog fax via the gateway conforming to 38 is used, the upper limit speed for increasing the communication speed is set to the data signal speed of the digital command signal as the communication speed declared by the analog FAX, and transmitted to the called terminal. To do.

  The invention according to claim 19 is the data communication method according to claim 11, wherein when the calling terminal determines that the call originates from a specific network, the control step sets the specific network. A data signal speed is set in the digital identification signal so that communication is performed at a communication speed, and the data is transmitted to the calling terminal to control the communication band.

  The invention according to claim 20 is the data communication terminal according to claim 11, wherein when a call is received from the calling side terminal, the same destination as the registered destination information exists in the control step, and communication from the destination is performed. When the communication speed of the communication error history is stored, the data signal speed at which the communication speed becomes slow is set in the digital identification signal and transmitted to the partner machine.

  A data communication program according to a twenty-first aspect is a program for causing a computer to execute each step according to any one of the eleventh to twentieth aspects.

  A recording medium according to a twenty-second aspect of the present invention is a computer-readable recording medium on which the data communication program according to the twenty-first aspect is recorded.

  According to the present invention, it is possible to determine the bandwidth that can be used in data communication based on the type of audio codec that is used in audio communication performed prior to data communication, which eliminates the need for communication speed information for each destination and requires the user to perform a setting operation. Therefore, it is possible to simplify software and reduce memory in the communication terminal.

  FIG. 1 is a block diagram showing the configuration of the present invention. A CPU 1, ROM 2, RAM 3, EEPROM 4, LAN communication control unit 5, image processing unit 6, plotter unit 7, scanner unit 8, and operation display unit 9 as control means are connected by a data bus 10. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 2 shows a data communication system to which the present invention is applied. The head office and factory A have a wideband speech codec G. 711 (use band 64 Kbbs) voice channel. In addition, the head office and factory B have a voice codec G. 729 (used bandwidth 8 Kbbs). The head office and branch office A are connected with a bandwidth of 100 Mbps, and the head office and branch office B are connected with a bandwidth of 128 Kbps.

  FIG. 3 shows a flowchart in this embodiment. In the system described above, voice call connection is performed in step S11, thereby performing voice communication (step S12). Thereafter, T.W. 38 calls are connected (step S13), and the FAX communication speed is determined from the voice codec (step S14). Thereafter, T.W. 38 communications are performed (step S15).

  In the above, the data communication terminal is an ITU-T recommendation T.30. Among communications conforming to IEEE 38 (hereinafter referred to as ITU-T recommendation T.38 communication), SIP (RFC3261) or ITU-T recommendation H.38. ITU-T recommendation T.323 for connecting the voice following the voice communication based on the means for connecting the voice at H.323 and the voice codec type used in the communication. The communication system of FIG. 2 can be applied by having means for determining the communication speed of 38 communications.

  In this embodiment, the G. 729 (bandwidth used: 8 Kbps), but when using a speech codec with such a high compression rate, ITU-T recommendation T.264 is used depending on the speech codec type. ITU-T recommendation T.38 using means for determining the communication speed of 38 communication. The communication speed of 38 communications is 7.2 Kbps.

  According to such an embodiment, since it is possible to determine the band that can be used in data communication based on the type of audio codec used in audio communication performed prior to data communication, it is not necessary to have communication speed information for each destination. This eliminates the need for the user to perform a setting operation, thus simplifying the communication terminal software and reducing the memory.

(Second Embodiment)
FIG. 4 is a sequence diagram of the second embodiment of the present invention, and FIG. 5 is a flowchart. In FIG. 5, after the voice call connection (step S21), voice communication is performed (step S22). 38 calls are connected (step S23), and the FAX communication speed is determined from the voice codec (step S24). In step S25, the device setting receiving modem type is compared with the communication speed of the audio codec type. As a result, when the communication modem type of the device setting is large (step S25 / Yes), the reception modem type slower than the use band of the voice codec is set in DIS (step S26). If the communication modem type of device setting is small (step S25 / No), the reception modem type of device setting is set to DIS (step S27). After performing the processing of steps S26 and 27, T.M. 38 communications are performed (step S28).

  In FIG. T.38 communication Call connection (1) performed in the previous phase of 38 connections (1)-When the use band of the voice codec used in the voice connection is 10 Kbps, ITU-T recommendation T.38 When the communication speed determined by the exchange of the digital identification signal / digital command signal between the 38 terminals is 14.4 Kbps, for example, the ITU-T recommendation T.38. The data communication speed of the digital identification signal is set to V.38 so that the use band of the 38 communication is also 10 kbps or less. The digital identification signal is transmitted to the calling terminal.

  In addition, ITU-T recommendation T.I. Call connection (1) performed in the previous phase of connection 38-When the use band of the voice codec used for voice connection is 20 Kbps, ITU-T recommendation T.38. When the communication speed determined by the exchange of the digital identification signal / digital command signal between the 38 terminals is, for example, 14.4 Kbps, the ITU-T recommendation T.264 is in the 14.4 Kbps band. 38, the data communication speed of the digital identification signal is set to V.38. Set to 17, and a digital identification signal is transmitted to the calling terminal.

  In such an embodiment, the communication speed is determined by the voice codec type used in the voice communication performed prior to the data communication at the called terminal, and the data signal speed is set in the digital identification signal and transmitted to the calling terminal. By doing so, the communication speed is controlled. Therefore, it is possible to control the band used for communication regardless of the presence or absence of the network band control function of the calling terminal.

(Third embodiment)
6 and 7 show a third embodiment of the present invention. In the flowchart of FIG. 7, after voice call connection (step S31), voice communication is performed (step S32). Thereafter, T.W. 38 calls are connected (step S33), and the FAX communication speed is determined from the voice codec (step S34). In step S35, the communication modem type and the communication speed of the audio codec type are compared. As a result, when the communication modem type of the device setting is large (step S35 / Yes), the reception modem type slower than the voice codec band is set to DCS (step S36). If the communication modem type of the device setting is small (step S35 / No), the reception modem type of the device setting is set to DCS (step S37). After performing the processing of steps S36 and 37, T.M. 38 communications are performed (step S38).

  In FIG. T.38 communication Call connection (1) performed in the previous phase of connection 38 (1)-When the use band of the voice codec used for voice connection is 10 Kbps, ITU-T recommendation T.38. When the communication speed determined by the exchange of the digital identification signal / digital command signal between the 38 terminals is 14.4 Kbps, for example, ITU-T recommendation T.30. The data communication speed of the digital command signal is set to 9600 bps so that the use bandwidth of 38 communication is also 10 Kbps or less, and the digital command signal is transmitted to the called terminal. Or ITU-T recommendation T.I. Call connection (1) performed in the previous phase of connection 38-When the use band of the voice codec used for voice connection is 20 Kbps, ITU-T recommendation T.38. When the communication speed determined by the exchange of the digital identification signal / digital command signal between the 38 terminals is, for example, 14.4 Kbps, the ITU-T recommendation T.264 is in the 14.4 Kbps band. The data communication speed of the digital command signal is set to 14.4 Kbps so that 38 communication is performed, and is transmitted to the called terminal.

  In such an embodiment, the communication speed is determined according to the voice codec type used in the voice communication performed prior to the data communication in the calling terminal, the data signal speed is set in the digital command signal, and Send. Thus, since the communication speed is controlled, the band used for communication can be controlled regardless of the presence or absence of the band control function of the called terminal.

(Fourth embodiment)
In the flowchart of FIG. 9, after voice call connection (step S41), voice communication is performed (step S42). 38 calls are connected (step S43). 38 communications are performed (step S44). In step S45, the T.P. It is determined whether or not a communication error occurs in 38 communication. If a communication error has occurred (step S45 / Yes), a warning report for slowing down the communication speed is output (step S46), and if no communication error has occurred (step S45 / No), the process ends. FIG. 8 shows an example of this warning report, which is visually displayed on the display unit of the operation panel.

  Specifically, ITU-T recommendation T.I. When a communication error is detected in 38 communication, the ITU-T recommendation T.30 exceeding the use band is used. In order to warn the user that there is a possibility that communication has been performed, ITU-T recommendation T.38. As shown in FIG. 8, an error for prompting a reduction in the communication speed of the 38 communication is displayed on the operation panel.

  In such an embodiment, when a communication error occurs, a communication error is notified, so that the user can be notified that the cause of the communication error is the communication speed, and normal communication can be performed in a short time.

(Fifth embodiment)
FIG. 11 shows a flowchart of the fifth embodiment of the present invention. After the voice call connection (step S51), voice communication is performed (step S52). 38 calls are connected (step S53). 38 communications are performed (step S54). In step S55, the T.P. It is determined whether or not a communication error occurs in 38 communication. If a communication error has occurred (step S55 / Yes), it is determined whether the communication speed parameter is equal to or higher than the current differential communication speed (step S56). If a communication error occurs when the current communication speed is exceeded (step S57 / Yes), the destination-specific speed parameter is rewritten later (step S57). If no communication error has occurred (step S55 / No), and if it is not equal to or higher than the current communication speed (step S56 / No), the processing ends.

  In this embodiment, the destination-specific parameters in FIG. 10 for managing information on the destination and the communication speed are provided on the memory. It also has a function that can store and change destination / communication speed information. When a call is made to the destination 8-234-5678, the ITU-T recommendation T.264 is used by using the communication speed of the destination-specific parameter. 38 communications. When a communication error occurs during this communication, the ITU-T recommendation T.12 exceeding the bandwidth used. 38 communication is performed, the communication speed of the parameter for each destination is automatically rewritten from 14400 bps to 12000 bps.

  In such an embodiment, when a communication error occurs, the next communication of the same destination is automatically performed by rewriting the communication speed of the destination-specific parameter for accumulating and managing the destination and the communication speed to be automatically reduced. Normal communication can be achieved.

(Sixth embodiment)
FIG. 13 shows a flowchart of the sixth embodiment of the present invention. After the voice call connection (step S61), voice communication is performed (step S62). 38 calls are connected (step S63). 38 communications are performed (step S64). In step S65, the T.P. It is determined whether or not a communication error occurs in 38 communication. When a communication error occurs (step S65 / Yes), the destination-specific speed parameter is rewritten later (step S66), and the process returns to step S61.

  If no communication error has occurred (step S65 / No), the count of the number of continuous communication at the same transmission speed is increased (step S67). Thereafter, it is determined whether or not normal communication has been performed five times at the same speed (step S68). When normal communication is performed five times continuously (step S68 / Yes), the process proceeds to step S69, and the speed parameter for each destination is increased by one step. If not (step S65 / No), the process is terminated.

  In this embodiment, the destination-specific parameters of FIG. 10 for managing the three information of the number of continuous normal communication times at the same speed as the destination and the communication speed by using the destination as a key are provided in the memory. Then, using the communication speed of the destination-specific parameter, the ITU-T recommendation T.30. 38 communication is started, but when normal communication is continued five times at the same speed, the ITU-T recommendation T.30 is at a communication speed one rank higher. The destination-specific parameter 9600 bps is rewritten to 12000 bps so that 38 communication can be performed. From 38 communication to high communication speed.

  In such an embodiment, when normal communication continues for a certain number of times continuously for the same destination, the communication speed is automatically adjusted by rewriting the destination-specific parameters for storing and managing the destination and the communication speed. The communication time can be shortened because it is faster.

(Seventh embodiment)
FIG. 14 shows a flowchart of the seventh embodiment of the present invention. After the voice call connection (step S71), voice communication is performed (step S72). 38 calls are connected (step S73). 38 communications are performed (step S74). In step S75, the T.P. It is determined whether or not a communication error occurs in 38 communication.

  If a communication error has occurred (step S75 / Yes), the office number is extracted from the extension number of the counterpart device (step S76). Then, the address book of the own device is searched (step S77). It is determined whether or not the office numbers match and the communication speed parameter is equal to or higher than the current communication speed (step S78). If these are YES (step S78 / Yes), the speed parameter for each destination is rewritten later. Step S79). Then, it is determined whether or not the address is in the last address book (step S80). If YES (step S78 / Yes), the process ends. If NO (step S78 / No), the process proceeds to step S77. Return. If no communication error has occurred (step S75 / No), the process ends.

  In this embodiment, the destination-specific parameters shown in FIG. 15 for storing and managing the destination and communication speed using the destination as a key are provided in the memory. 38 Communication is started. When a communication error occurs, the T.O. Based on the determination that 38 communication is performed, the parameter is automatically rewritten to 12000 bps so that the communication speed of the destination-specific parameter is slower than the 14400 bps communication speed at which the error occurred.

  The destination information in the destination-specific parameter matches the first few digits of the business phone number determined in advance for the destination telephone number, and all destinations in the destination-specific parameter that can be determined as terminals in the same network On the other hand, the communication speed parameter is automatically rewritten so as to be delayed by one rank. That is, as shown in FIGS. 15 and 16, when the numbering plan of the telephone number in the destination information is 8-XXXXX, it is determined that the office is the same if XXX matches. Is. Here, XX is a business office number, and XXX is an extension number.

  In such an embodiment, the communication speed parameter is rewritten so that the communication speed parameter of all destinations that can be determined as terminals in the same network from the destination information is automatically delayed by one rank. The number of errors can be reduced.

(Eighth embodiment)
FIG. 17 shows a flowchart of the eighth embodiment of the present invention. After the voice call connection (step S81), voice communication is performed (step S82). 38 calls are connected (step S83). In step S84, a communication speed faster than the voice communication use band is set. In step S85, T.M. It is determined whether or not the speed is faster than the 38 GW and analog FAX DIS modem type. In the case of a high speed (step S85 / Yes), T.W. 38 GW is set as the communication speed of the analog FAX DIS modem type (step S86), and the process proceeds to step S87. If NO in step S85 (step S85 / No), the process directly proceeds to step S87.

  In step S87, T.W. 38 communications. This T.W. In 38 communication, it is determined whether or not a communication error occurs (step S88). If a communication error has occurred (step S88 / Yes), it is determined whether the communication speed parameter is equal to or higher than the current communication speed (step S89). In the case of YES (step S89 / Yes), the destination-specific speed parameter is rewritten later (step S90). After step S90, the process returns to step S81. If the communication speed parameter is not equal to or higher than the current communication speed (step S89 / No), and if no communication error has occurred (step S88 / No), the process ends.

  ITU-T recommendation In the case of 38 terminals, image data can be transmitted at a communication speed or higher determined by exchanging the digital identification signal / digital command signal. In the case of analog FAX via 38 gateways, there is a high possibility of communication errors in a general narrow-band network environment. In this embodiment, even when communication is faster than the communication speed of the destination-specific parameter, the network band is controlled as a communication speed equal to or lower than the communication speed determined by the digital identification signal / digital command signal exchange.

  In such an embodiment, the ITU-T recommendation T.30. 38 terminal, the gateway terminal connected to the analog FAX and the ITU-T recommendation T.38. Even when 38IAF communicates, transmission can be performed at a communication speed faster than the communication speed determined by the exchange of the digital identification number / digital command signal. However, if there is a network bandwidth limitation, the digital identification number / digital command signal By setting the communication speed with the communication speed determined by the exchange as the upper limit, the number of communication errors can be reduced. Individually, “IAF” is an Internet Aware FAX, and is an ITU-T recommendation T.264 that is directly connected to a network. It refers to 38 terminals.

(Ninth embodiment)
FIG. 18 is a flowchart of the ninth embodiment of the present invention. After the voice call connection (step S91), voice communication is performed (step S92). 38 calls are connected (step S93). In step S94, it is determined whether the incoming call is from a recorded network destination. If not (step S94 / No), the process jumps to step S96. In the case of an incoming call from the recorded network destination (step S94 / Yes), the process proceeds to step S95, and it is determined whether or not the speed parameter is registered in the recorded network destination.

  If the speed parameter is not registered (No at Step S95), the process proceeds to Step S96, and the DIS modem type is set from the set value of the own device. If the parameter is registered (step S95 / Yes), the process proceeds to step S97, and the DIS modem type is set from the speed parameter set for each specific network destination. After the processes of steps S96 and S97, the T.S. 38 communications are performed (step S98).

  In this embodiment, the destination-specific parameters shown in FIG. 15 for managing the destination and the communication speed as information which can store both the extension number and the IP address are provided, and the destination information which can record both the extension number and the IP address on the calling side; The terminal has communication speed information that can be communicated on the network band. When an incoming call is received from the corresponding destination, the destination-specific parameter table is searched. When the calling side destination information is an extension number and the establishment number, which is a component of the extension number, matches one of the destination-specific parameters, it is determined that the call originates from the same network. On the other hand, when the call destination information is an IP address and the network address matches one of the destination parameters, the call destination is determined to be the same network and matches the speed information of the destination parameters. The network band is controlled by transmitting the digital identification signal.

  In such an embodiment, when an incoming call is received from the calling side terminal, information on the destination item and the communication speed in which both the extension number and the IP address provided in the memory are obtained by acquiring the destination information on the calling side is registered. If the destination-specific parameter to be managed is searched and it can be determined that the destination is within the same network, the communication speed corresponding to the destination information is set to the data signal speed of the digital identification signal and sent to the calling side. The occurrence of communication errors can be reduced without depending on the function / setting of the calling terminal.

(10th Embodiment)
FIG. 19 is a flowchart of the tenth embodiment of the present invention. After the voice call connection (step S101), voice communication is performed (step S102). 38 calls are connected (step S103). In step S104, it is determined whether there is an error in the destination information and a communication speed history at that time. If it does not exist (step S104 / No), the process proceeds to step S105, where the DIS modem type is set from the setting value of the own device. If it is present in step S104 (step S104 / Yes), the DIS modem type is set so that the communication speed becomes slower from the speed parameter set for each specific network destination (step S106). After the processing of steps S105 and 106, T.M. 38 communications are performed (step S107).

  FIG. 20 shows an example of parameters used in this embodiment. FIG. 20 is a destination-specific parameter that manages destination information that can store both the extension number and the IP address and a communication speed at the time of a communication error. By providing this parameter, when the incoming call is answered, the calling side terminal Calling party extension number or IP address sent from. When an incoming call is received from the corresponding destination, this information table is searched. When the call destination information is an extension number, it is determined that the call is from the same network if the establishment number that is a component of the extension number matches one of the destination-specific parameters. When the call destination information is an IP address, if the network address matches one of the parameters for each destination, the call destination is determined to be a call destination of the same network and compared with the speed information at the time of communication error of the corresponding destination. The network bandwidth is controlled by setting a low data signal speed to the digital identification signal and transmitting it.

  In such an embodiment, when an incoming call is received from the calling side terminal, information on the destination item and the communication speed in which both the extension number and the IP address provided in the memory are obtained by acquiring the destination information on the calling side is registered. If it can be determined that the destination is within the same network by searching for the destination-specific parameters managed as, based on the communication error history (communication speed) corresponding to the destination information, the communication speed when the communication error occurs Since the data signal rate of the digital identification signal is set so as to be delayed and sent to the calling side, the occurrence of communication errors can be reduced without depending on the function / setting of the calling side terminal.

  The data communication program of the present invention is a program that causes a computer to execute the above flowchart. The recording medium of the present invention is a recording medium in which the data communication program is recorded so as to be readable by a computer.

It is a block diagram which shows the structure of this invention. It is a figure which shows the system with which 1st Embodiment is applied. It is a flowchart of a 1st embodiment. It is a sequence diagram which shows the control action of 2nd Embodiment. It is a flowchart of a 2nd embodiment. It is a sequence diagram which shows the control action of 3rd Embodiment. It is a flowchart of a 3rd embodiment. It is a figure which shows an example of a warning report. It is a flowchart of a 4th embodiment. It is a figure which shows the parameter classified by destination. It is a flowchart of a 5th embodiment. It is a figure which shows the parameter according to destination in the same network. It is a flowchart of a 6th embodiment. It is a flowchart of a 7th embodiment. It is a figure which shows the parameter classified by destination. It is a figure which shows a system. It is a flowchart of 8th Embodiment. It is a flowchart of 9th Embodiment. It is a flowchart of 10th Embodiment. It is a figure of the parameter according to communication which shows a communication error log. 1 is a diagram of a communication system using an IP network.

Explanation of symbols

1 CPU
2 ROM
3 RAM
4 EEPROM
5 LAN communication control unit 6 Image processing unit 7 Plotter unit 8 Scanner unit 9 Operation display unit 10 Data bus

Claims (22)

  A connection unit capable of connecting to an IP network; a determination unit that determines a usable band from a voice codec type; and a control unit that controls a usable band in a data communication connection to be connected subsequent to the voice connection. A data communication terminal characterized by determining a network band that can be used for data communication from a voice codec type used for voice connection, and controlling the band used for data communication. A data communication terminal according to claim 1, wherein
The determining means in the called terminal determines the usable network bandwidth, and the control means sets the data signal speed of the digital identification signal so as to be a network bandwidth smaller than the network bandwidth and transmits it to the calling terminal. A data communication terminal. A data communication terminal according to claim 1, wherein
The determining means in the calling terminal determines the usable network bandwidth, and the control means sets the data signal rate of the digital command signal to control the transmission of the image data packet so that the network bandwidth is smaller than the network bandwidth. A data communication terminal characterized by. A data communication terminal according to claim 1, wherein
A data communication terminal that performs error notification that prompts to reduce a communication speed when a communication error is detected. A data communication terminal according to claim 1, wherein
A data communication terminal characterized in that communication parameters can be set for each destination, and when a communication error occurs, a communication speed parameter in the set parameters for each destination is slowed down. A data communication terminal according to claim 1, wherein
Communication parameters can be set for each destination and the number of communications to the destination is counted, and when the number of normal communications reaches the specified number, a faster communication speed than the current communication speed is stored for each destination. A data communication terminal, wherein the next communication is performed at the high communication speed by writing in the communication parameters. A data communication terminal according to claim 5, wherein
Communication parameters can be changed for each destination, and it is determined whether the destination is on the same network from the office number or IP address of the calling destination destination FAX number, and the destination on the same network is determined from the network address of the calling destination. A data communication terminal characterized in that, when the destination is in the same network as the destination where the communication error has occurred, the speed parameter in the individual parameter for each set destination is set slower. A data communication terminal according to claim 6,
The calling terminal is ITU-T recommendation T.264. 38, the callee terminal connected to the caller terminal is ITU-T Recommendation T.36. When the analog fax via the gateway conforming to 38 is used, the upper limit speed for increasing the communication speed is set to the data signal speed of the digital command signal as the communication speed declared by the analog FAX, and transmitted to the called terminal. Data communication terminal. A data communication terminal according to claim 1, wherein
When it is determined that the calling terminal is a call from a specific network, the control means sets the data signal speed in the digital identification signal so as to communicate with the specific network at the set communication speed. And a data communication terminal for controlling a communication band by transmitting to the calling terminal. A data communication terminal according to claim 1, wherein
When a call is received from the calling terminal, the control means has the same destination as the registered destination information, and when the communication speed of the communication error history is stored in communication from the destination, the communication speed is included in the digital identification signal. A data communication terminal characterized by setting a data signal speed at which the communication speed becomes low and transmitting the data signal to the other party.   A connection step of connecting to an IP network, a determination step of determining an available bandwidth from a voice codec type, and a control step of controlling a bandwidth used in a data communication connection to be connected subsequent to the voice connection, A data communication method comprising: determining a network band that can be used for data communication from a voice codec type that is used for voice connection; and controlling the band used for data communication. A data communication method according to claim 11, comprising:
In the determining step in the called terminal, the usable network band is determined, and in the controlling step, the data signal speed of the digital identification signal is set so as to be smaller than the network band and transmitted to the calling terminal. A data communication method characterized by: A data communication method according to claim 11, comprising:
The determining means in the calling terminal determines the usable network bandwidth, and in the control step, the data signal rate of the digital command signal is set so that the network bandwidth is smaller than the network bandwidth, and the image data packet transmission is controlled. A data communication method characterized by the above. A data communication method according to claim 11, comprising:
A data communication method characterized by performing an error notification for urging to reduce a communication speed when a communication error is detected. A data communication method according to claim 11, comprising:
A data communication method, wherein a communication parameter can be set for each destination, and when a communication error occurs, a communication speed parameter in the set parameters for each destination is slowed down. A data communication method according to claim 11, comprising:
Communication parameters can be set for each destination and the number of communications to the destination is counted, and when the number of normal communications reaches the specified number, a faster communication speed than the current communication speed is stored for each destination. A data communication method characterized in that the next communication is performed at the high communication speed by writing in the communication parameters. The data communication terminal according to claim 15, wherein
Communication parameters can be changed for each destination, and it is determined whether the destination is on the same network from the office number or IP address of the calling destination destination FAX number, and the destination on the same network is determined from the network address of the calling destination. A data communication terminal characterized in that, when the destination is in the same network as the destination where the communication error has occurred, the speed parameter in the individual parameter for each set destination is set slower. The data communication terminal according to claim 16, wherein
The calling terminal is ITU-T recommendation T.264. 38, the callee terminal connected to the caller terminal is ITU-T Recommendation T.36. When the analog fax via the gateway conforming to 38 is used, the upper limit speed for increasing the communication speed is set to the data signal speed of the digital command signal as the communication speed declared by the analog FAX, and transmitted to the called terminal. Data communication terminal. A data communication method according to claim 11, comprising:
When it is determined that the calling terminal is a call from a specific network, the control step sets the data signal speed in the digital identification signal so as to communicate with the specific network at the set communication speed. And transmitting the data to the calling terminal to control the communication band. A data communication terminal according to claim 11, wherein
When a call is received from the calling terminal, the same destination as the registered destination information exists in the control step, and the communication speed of the communication error history is stored in the communication from the destination. A data communication method characterized by setting a data signal speed at which the communication speed becomes low and transmitting the data signal to the other party.   The data communication program for making a computer perform each step of any one of Claims 11-20.   A computer-readable recording medium on which the data communication program according to claim 21 is recorded.

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