JP2004023215A - Network communication equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide network communication equipment that can appropriately refuse a call termination. <P>SOLUTION: Since this network communication equipment is constituted to determine whether the call termination is accepted or refused by referring to a value contained in a "user-user" information element carried on a call setting message, the equipment can appropriately accept the call termination. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention has a communication function conforming to ITU-T Recommendation H.323 and utilizes a packet communication network to implement ITU-T Recommendation T.3. The present invention relates to a network communication device capable of performing facsimile communication conforming to F.38.
[0002]
[Prior art]
As a communication system using a packet communication network such as the Internet, there is a communication system compliant with ITU-T H.323.
[0003]
This Recommendation H.323 addresses technical requirements for multimedia communication systems in packet networks that do not necessarily guarantee service quality.
[0004]
Further, as the packet network, a local area network, an enterprise area network, a metropolitan area network, an intranet, an interconnected network including the Internet, and the like are targeted.
[0005]
Further, packet-type transmission such as PPP through point-to-point connection or dial-up connection on GSTN or ISDN is also included.
[0006]
In addition, these networks may consist of a single segment, or may have a complex topology in which a plurality of network segments are interconnected.
[0007]
The communication system of ITU-T Rec. H.323 includes a mode in which call control between terminal devices included in a network is performed by applying a gatekeeper device.
[0008]
Here, the gatekeeper device performs real-time two-way communication between a H.323 terminal on a packet network and a TTC terminal on a switched network or with another H.323 gateway on a network. Defined as an endpoint to provide. Other TTC terminals are H.310 (application of H.320 to B-ISDN), H.320 (ISDN), H.321 (ATM), and H.322 (quality of service (QoS) guaranteed LAN). ), H.324 (GSTN), H.324M (mobile communication), and ITU-T Recommendation V. 70 (DSVD).
[0009]
Note that an ITU-T H.323 terminal is a communication terminal having a communication function conforming to ITU-T Rec. H.323. Further, in the description in this specification, a terminal or the like described with a TTC standard number or an ITU-T recommendation number provided with a communication function conforming to the respective TTC standard or ITU-T recommendation. It means a communication terminal or the like.
[0010]
[Problems to be solved by the invention]
By the way, in such a JT-H323 terminal device, when there is a request to reject an incoming call from a partner terminal, a telephone number, a facsimile number or the like is used as in a terminal device connected to a conventional analog public network PSTN. There was a situation that the other terminal could not be identified by reference.
[0011]
The present invention has been made in view of such circumstances, and has as its object to provide a network communication device that can appropriately reject an incoming call.
[0012]
[Means for Solving the Problems]
The present invention has a communication function conforming to ITU-T Recommendation H.323 and utilizes a packet communication network to implement ITU-T Recommendation T.3. In a network communication device capable of facsimile communication conforming to F.38, destination information is acquired from a source call signal address included in a user / user information element of a call setup message, and based on the acquired destination information, the incoming call is determined. It is determined whether or not to accept. Further, the destination information may be a calling side IP address, a calling side port number, or a calling side IP address and a port number.
[0013]
It also has a communication function conforming to ITU-T Recommendation H.323 and utilizes a packet communication network to implement ITU-T Recommendation T.30. In a network communication device capable of performing facsimile communication conforming to the standard 38, it is checked whether or not the source call signal address is included in the user / user information element of the call setup message, and if not, the incoming call is rejected. It is like that.
[0014]
It also has a communication function conforming to ITU-T Recommendation H.323 and utilizes a packet communication network to implement ITU-T Recommendation T.30. In a network communication device capable of facsimile communication conforming to F.38, if the priority of the desired setting value of the terminal itself at the first start included in the user / user information element of the call setting message SETUP is low, Is rejected.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0016]
FIG. 1 shows an example of a communication system according to an embodiment of the present invention.
[0017]
First, this communication system is a communication system conforming to ITU-T H.323, which uses the Internet INET as a packet communication network, and receives signals from various terminal devices provided in two regions, a region ARa and a region ARb. Become.
[0018]
In the regions ARa and ARb, group 3 facsimile machines FXa and FXb as TTC terminals, gateway devices GWa and GWb as JT-H323 gateways, and T.H. 38 terminal devices TA1 to TAn and TB1 to TBn, and gatekeeper devices GKa and GKb.
[0019]
Here, T. 38 terminal device is defined in ITU-T Recommendation T.38. A terminal device conforming to ITU-T Recommendation T.38. The communication of 30 terminal apparatuses (group 3 facsimile apparatuses) can be realized in real time using a packet communication network.
[0020]
Also, T.I. As a communication mode of the T.38 terminal device, T.38 communication is performed via a packet communication network. Two communication modes are defined: a communication mode in which communication is directly performed between the 38 terminal apparatuses, and a communication mode in which communication is performed with a group 3 facsimile apparatus connected to the public network PSTN via a gateway apparatus.
[0021]
In other words, in this case, the gateway devices GWa and GWb transmit It has a function for realizing communication between the 38 terminal devices TA1 to TAn and TB1 to TBn and the group 3 facsimile devices FXa and FXb.
[0022]
FIG. 38 shows a configuration example of 38 terminal devices (TA1 to TAn, TB1 to TBn).
[0023]
Referring to FIG. 38, which performs various control processes such as a control process of each part of the terminal device, a facsimile transmission control procedure (ITU-T Recommendation T.30 procedure), and a real-time transmission control procedure (ITU-T Recommendation T.38 procedure). The system memory 2 stores a control processing program executed by the system control unit 1 and various data necessary for executing the processing program, and constitutes a work area of the system control unit 1. The parameter memory 3 stores this T.D. The clock circuit 4 is for storing various kinds of information unique to the T.38 terminal device, and outputs current time information.
[0024]
The scanner 5 is for reading a document image at a predetermined resolution, the plotter 6 is for recording and outputting an image at a predetermined resolution, and the operation display unit 7 is for operating this facsimile machine. And consists of various operation keys and various indicators.
[0025]
The encoding / decoding unit 8 encodes and compresses the image signal and decodes the encoded and compressed image information into the original image signal. Used mainly for error detection. The image storage device 9 is for storing a large number of image information in a coded and compressed state.
[0026]
The network controller 10 transmits the T. This is for connecting 38 terminal devices to the public telephone network PSTN, and has an automatic transmission / reception function.
[0027]
The group 3 facsimile modem 11 is for realizing a group 3 facsimile modem function, and is a low speed modem function (V.21 modem) for exchanging transmission procedure signals, and mainly for exchanging image information. It has a high-speed modem function (V.17 modem, V.34 modem, V.29 modem, V.27ter modem, etc.).
[0028]
The Internet communication control unit 12 transmits the T. The terminal 38 connects the terminal device to the Internet INET and exchanges various data via the Internet INET. The TCP / IP packet analysis unit 13 transmits the TCP / IP packet received by the Internet communication control unit 12 in the TCP mode. The UDP packet analyzer 14 analyzes the IP packet and extracts the received information by analyzing the UDP packet received by the Internet communication controller 12 in the UDP mode. .
[0029]
In the real-time transmission procedure, the group 3 protocol information generation section 15 converts the reception information output from the TCP / IP packet analysis section 13 into the corresponding group 3 transmission procedure signal information in the TCP mode, and outputs the UDP in the UDP mode. It converts received information output from the packet analyzer 14 into corresponding group 3 transmission procedure signal information.
[0030]
The group 3 protocol information extracting section 16 is for extracting group 3 facsimile transmission procedure information to be transmitted in the real-time transmission procedure, and the TCP / IP packet converting section 17 is configured to output the group 3 protocol information extracting section 16 in the TCP mode. Is used to convert the group 3 facsimile transmission procedure information output from TCP / IP to TCP / IP packet data, and the output data is applied to the Internet communication control unit 12.
[0031]
The UDP packet converter 18 converts the group 3 facsimile transmission procedure information output from the group 3 protocol information extractor 16 into UDP packet data in the UDP mode. It is added to the control unit 12.
[0032]
These are a system control unit 1, a system memory 2, a parameter memory 3, a clock circuit 4, a scanner 5, a plotter 6, an operation display unit 7, an encoding / decoding unit 8, an image storage device 9, a network control device 10, a group 3 The facsimile modem 11, the group 3 protocol information generating unit 14, and the group 3 protocol information extracting unit 15 are connected to an internal bus 17, and exchange of data between these elements is performed mainly through the internal bus 17. Has been done through.
[0033]
Data exchange between the network control device 10 and the group 3 facsimile modem 11 is directly performed.
[0034]
FIG. 4 shows an example of a data transmission procedure between 38 terminal devices.
[0035]
First, the caller T. 38 terminal device, the receiving side T.38. Establish a call control TCP channel to the T.38 terminal, and then The terminal device 38 transmits a packet SETUP for call connection to the destination T.38. 38 terminal device.
[0036]
T. The terminal device of the originating T.38. When the packet SETUP is received from the terminal device 38, the packet CONNECT is sent to the originating T.38. 38 terminal, thereby responding to the calling T.38 terminal. 38 terminal device and the destination T.38. A call is established with the T.38 terminal. Further, by exchanging the packet SETUP and the packet CONNECT, the mode of the transport to be used (TCP mode or UDP mode) and the port number to be used are set.
[0037]
Next, the outgoing T. The T.38 terminal establishes a data UDP channel from the calling side to the called side, and establishes a called T.38. The terminal device establishes a data UDP channel from the called side to the calling side, and then sets the calling T.38. 38 terminal device and the destination T.38. The communication with the terminal T.38 is performed using the established two data UDP channels. T.38 according to the T.38 procedure. The exchange of data for 38 sessions is started, and the image information communication operation is executed.
[0038]
When the image information communication ends, the calling side T.P. The terminal device 38 transmits the packet RELEASECOMP to the destination T.38. 38 terminal, thereby transmitting the call to the calling T.38 terminal. 38 terminal device and the destination T.38. The data communication operation with the 38 terminal devices ends.
[0039]
FIG. 4 shows an example of a procedure for performing call control of a terminal device using a gatekeeper device (see FIG. 10 of ITU-T H.323).
[0040]
First, the calling end point (calling side terminal device) EPc sends a call connection request (calling out) ARQ to the gatekeeper device (group) GKs. If the gatekeeper device (group) GKs can accept the call connection request (call), it sends out a response ACF to the calling end point EPc, and accepts the call connection request (call). If it is not possible, it sends a response ARJ to the originating endpoint EPc.
[0041]
When receiving the response ACF from the gatekeeper device (group) GKs, the originating endpoint EPc sends a predetermined call setting signal to the destination endpoint EPd, which is the communication target.
[0042]
Upon receiving the call setting signal, the called endpoint EPd sends out a call connection request (called) ARQ to the gatekeeper device (group) GKs. If the gatekeeper device (group) GKs can accept the call connection request (incoming call), it sends out a response ACF to the called end point EPd, and accepts the call connection request (incoming call). If not, the response ARJ is sent to the destination endpoint EPd.
[0043]
When receiving the response ACF from the gatekeeper device (group) GKs, the receiving endpoint EPd sends a predetermined response signal (acknowledge) to the calling endpoint EPc.
[0044]
As a result, a communication path is set between the originating endpoint EPc and the destination endpoint EPd, and communication between the originating endpoint EPc and the destination endpoint EPd is performed.
[0045]
In this embodiment, the receiving side T.P. In order to be able to reject an incoming call in the T.38 terminal device, for example, as shown in FIGS. Before the start of the 38 sessions, it is possible to determine whether or not to accept an incoming call at the stage where the call setup message SETUP is received.
[0046]
That is, the originating T. 38 terminal device sends a call setup message SETUP, and sends the call setup message SETUP to the called T.38 terminal. 38 terminal device receives the call, the receiving T.38 The 38th terminal device refers to a predetermined information element of the call setup message SETUP to determine whether or not the incoming call can be accepted, and if so, as shown in FIG. By transmitting CONN, the communication operation is continuously performed.
[0047]
On the other hand, if it is determined that the incoming call is not accepted, a release completion message REL_COMP (RELEASE COMPLETE) is sent out, as shown in FIG.
[0048]
Here, as shown in FIG. 6, the call setup message SETUP includes a protocol identifier for identifying a protocol specification (format, sequence, etc.) for defining the layer 3 call control message of TTC Recommendation Q931, and which call A call number for identifying whether the message is involved in the message, a message type for identifying the content of each message (in this case, a value indicating the call setup message SETUP is set), and "transmission capability" information And at least the "user-user" information element is included (see Recommendation H.225.0).
[0049]
The “transmission capability” information element is an information transfer capability indicating whether the content of information to be transmitted is voice, unrestricted digital information, restricted digital information, 3.1 kHz audio, 7 kHz audio, or video. , The transfer mode indicating whether the switching function used is circuit-switched or packet-switched, the information transfer rate indicating the information transfer speed, the information indicating the information transfer mode, and the information indicating the user information protocol. (See Recommendation Q.931).
[0050]
The "user / user" information element is used for transmitting information between users, and the content of the "user / user" information element is transparently transferred without being interpreted by ISDN and is transmitted to the other party. It is communicated to the user (in the case of Recommendation Q.931).
[0051]
Also, with reference to H.225.0 applied by H.323 terminal equipment at the time of call control, the "user / user" information element includes various information used for call control and the like. For example, a source call signal address (sourceCallSignalAddress) including a transport address of a transmission source, a fast start (fastStart) for designating a channel type (TCP or UDP) to be referred to when a logical channel is opened, and the like are included.
[0052]
For example, when a source call signal address is used to determine whether or not to accept an incoming call, the calling T.A. specified to accept the incoming call is used. When the call setup message SETUP is received from the terminal device 38, the value (plurality) of the transport address carried by the source call signal address is registered in the terminal identification information table as shown in FIG.
[0053]
Then, it may be determined that an incoming call is accepted only when a source call signal address including the transport address registered in the terminal identification information table is received.
[0054]
Further, since the transport address includes an IP address, a port number, and the like, not only the determination is made using the entire transport address, but also the IP address or the port number, or the IP address and the port number. Can be determined by the combination of
[0055]
When the value of the first start is used to determine whether or not to accept an incoming call, the following determination is made. The value of the first start is determined by the T. 38 shows the priority of the channel type used when the 38 terminal device opens the specified logical channel.
[0056]
Therefore, the receiving side T. It is determined that the incoming call is accepted when the channel type desired to be used in the 38 terminal device matches the channel type designated as the first priority, and the incoming call is rejected when the channel type does not match. Can be.
[0057]
As described above, in the present embodiment, it is determined whether the incoming call is permitted or the incoming call is rejected by referring to the value included in the “user / user” information element carried in the call setup message SETUP. Therefore, it is possible to appropriately receive an incoming call.
[0058]
FIG. 38 illustrates an example of processing of the 38 terminal devices.
[0059]
First, it is waiting whether or not to receive the call setup message SETUP (NO loop of decision 101), and receives the call setup message SETUP. If the result of decision 101 is YES, the “user” of the received call setup message SETUP is displayed. A source call signal address is obtained from the "user" information element (process 102).
[0060]
Then, it checks whether the transport address included in the obtained source call signal address is registered in the terminal identification information table (step 103). As the inspection method, the above-described method can be appropriately adopted.
[0061]
If it is determined in step 103 that the transport address included in the obtained source call signal address is registered in the terminal identification information table, and if the result of determination 104 is YES, a response message CONN is sent out. The normal communication operation is continued (process 105).
[0062]
If it is determined in the process 103 that the transport address included in the obtained source call signal address is not registered in the terminal identification information table, and if the result of the determination 104 is NO, the release completion message REL_COMP is sent. The communication operation is terminated at that time (process 106).
[0063]
FIG. 38 shows another example of the processing of the 38 terminal devices.
[0064]
First, it is waiting whether or not to receive the call setup message SETUP (NO loop of decision 201), and receives the call setup message SETUP. If the result of decision 201 is YES, the "user" of the received call setup message SETUP is displayed. Obtain the source call signal address from the "user" information element (process 202).
[0065]
At this time, it is checked whether the source call signal address is included in the "user / user" information element (decision 203). When the result of the determination 203 is YES, it is checked whether or not the transport address included in the obtained source call signal address is registered in the terminal identification information table (process 204). As the inspection method, the above-described method can be appropriately adopted.
[0066]
If it is determined in step 204 that the transport address included in the obtained source call signal address is registered in the terminal identification information table, and if the result of determination 205 is YES, a response message CONN is sent out. Then, the normal communication operation is continuously performed (process 206).
[0067]
If it is determined in step 204 that the transport address included in the obtained source call signal address is not registered in the terminal identification information table, the result of determination 205 is NO, and In the case where the source call signal address is not included in the "user" information element and the result of the judgment 203 is NO, a release completion message REL_COMP is transmitted, and the communication operation is terminated at that time (step 207). ).
[0068]
FIG. 38 shows still another example of the processing of the 38 terminal devices.
[0069]
First, it is waiting whether or not to receive the call setup message SETUP (NO loop of decision 301), and receives the call setup message SETUP. If the result of decision 301 is YES, the "user" of the received call setup message SETUP A first start is acquired from the "user" information element (process 302).
[0070]
Then, it is checked whether or not the channel type designated as the first priority in the acquired first start matches the channel type to be used set in the own terminal (process 303).
[0071]
When it is determined in step 303 that the channel type designated as the first priority in the first start matches the channel type to be used set in the own terminal, and when the result of determination 304 is YES, Then, a response message CONN is sent out to continue the normal communication operation (process 305).
[0072]
If it is determined in step 303 that the channel type designated as the first priority in the first start does not match the channel type to be used set in the own terminal, the result of determination 304 is NO. , A release completion message REL_COMP is sent, and the communication operation is terminated at that time (process 306).
[0073]
Note that in the above-described embodiment, the T.D. Although a case where the present invention is applied to 38 terminal devices has been described, the present invention can be similarly applied to other H.323 terminal devices.
[0074]
【The invention's effect】
As described above, according to the present invention, by referring to the value included in the “user / user” information element carried in the call setup message, whether to permit the incoming call or to reject the incoming call is determined. Since the determination is made, an effect is obtained that an incoming call can be appropriately received.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of a communication system according to one embodiment of the present invention.
FIG. The block diagram showing the example of composition of 38 terminal units (TA1-TAn and TB1-TBn).
FIG. 38 is a time chart showing an example of a data transmission procedure between 38 terminal devices.
FIG. 4 is a time chart showing an example of a procedure for performing call control of a terminal device using a gatekeeper device.
FIG. 5 is a time chart showing an example of a procedure when an incoming call is rejected by using a call setting message SETUP.
FIG. 6 is a schematic diagram showing an example of an information element of a call setup message SETUP.
FIG. 7 is a schematic diagram showing an example of a terminal identification information table.
FIG. 38 is a flowchart illustrating an example of processing of a 38 terminal device.
FIG. 38 is a flowchart showing another example of the processing of the 38 terminal device.
FIG. 38 is a flowchart showing still another example of the process of the 38 terminal device.
[Explanation of symbols]
TA1 to TAn, TB1 to TBn 38 terminal device 1 system control unit 2 system memory

Claims (6)

It has a communication function conforming to ITU-T Recommendation H.323 and a packet communication network. In a network communication device capable of facsimile communication conforming to J.38,
Destination information is acquired from the source call signal address included in the user / user information element of the call setting message, and based on the acquired destination information, it is determined whether or not to accept the incoming call. Network communication device. 2. The network facsimile apparatus according to claim 1, wherein the destination information is a calling side IP address. 2. The network facsimile apparatus according to claim 1, wherein the destination information is a calling port number. 2. The network facsimile apparatus according to claim 1, wherein the destination information is a calling side IP address and a port number. It has a communication function conforming to ITU-T Recommendation H.323 and a packet communication network. In a network communication device capable of facsimile communication conforming to J.38,
A network communication device, which checks whether a source call signal address is included in a user / user information element of a call setup message and, if not, rejects the incoming call. It has a communication function conforming to ITU-T Recommendation H.323 and a packet communication network. In a network communication device capable of facsimile communication conforming to J.38,
A network communication device for rejecting the incoming call when the priority of the setting desired value of the terminal at the first start included in the user / user information element of the call setting message SETUP is low; .

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