JPH0690257A - Communication system - Google Patents

Abstract

PURPOSE:To prevent unnecessary communication expenses by changing the address conversion system in accordance with the destination. CONSTITUTION:When receiving a call setting (SETUP) message from a G4 facsimile equipment (step S1), an autodialing device for ISDN checks the incoming address of this call setting message (step S2) and refers to an address conversion table consisting of an escape code(ESC), a network address(NTA) corresponding to ESC, and other information elements (SID) (step S3). If ESC exists in the number element of the incoming address of the call setting message, NTA corresponding to this ESC is built in the incoming address of the call setting message, and the original incoming address-(ESC), other information (SID) and the identifier are built in inter-user information, and they are transmitted to the network (step S6). If ESC does not exist there, the received call setting message is transmitted to the network as it is (step S5).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for performing address conversion between PSDN / ISDN of a gateway device for connecting ISDN and PSDN of a facsimile network system and automatic dialing for ISDN.

[0002]

2. Description of the Related Art In recent years, integrated digital communication network (ISDN)
With the widespread use of ISDN, the number of service forms for providing communication services by connecting ISDN and a conventional packet switched network (PSDN) is increasing. At the time of this address conversion from PSDN to ISDN, for example, when the communication device of the other party is the same gateway device, the address conversion from ISDN to PSDN is necessary again at the other party, so it is necessary to send address information to the other party. There is. At this time, in order to perform conversion in real time, it is necessary to add address information for conversion to the call setup message and send it. This includes
In general, an area of user information that can be used for end-to-end information exchange and that can be used without depending on the connection form of the device at the other end to the ISDN is used. That is, there is a method of 1) putting the address information of PSDN on the destination subaddress in the call setting message of ISDN, and 2) sending the address information as image code and code data in the data transfer phase.

Further, in order to use a service targeting ISDN-compliant G4 facsimile which has become widespread in recent years, it is necessary to send a service designation code, an identification code (ID), and the like, and for that purpose, a call setting message. Is using information between users.

[0004]

However, in the above-described conventional communication device, when the address is converted from PSDN to ISDN, a certain conversion is performed regardless of the type of the communication device at the other end. Even if the user-to-user information is added and the partner device does not need the user-to-user information at the final destination (for example, G4 facsimile), since the charged user-to-user information is added as a service, useless communication cost is generated. There's a problem.

Further, in the method of performing the address translation using the destination subaddress in the call setup message, ISDN and P
There is a problem that a device for connecting to the SDN is bus-connected and the subaddress cannot be used. Further, when using the service for the ISDN-compatible G4 facsimile that uses the user-to-user information of the call setup message, a terminal device having a special specification for setting data in the user-to-user information of the call setup message. For example, a G4 facsimile machine is required.

It is an object of the present invention to determine whether the communication partner is a G4 facsimile machine or a gateway machine, and ISDN / PSDN.
It is an object of the present invention to provide a communication system that changes the address conversion method between the two. Another object of the present invention is to provide a communication system capable of using user-to-user information of a call setup message in an ISDN-compatible G4 facsimile machine.

[0007]

To achieve the above object, the present invention according to claim 1 provides at least a group IV.
In a communication system that includes a facsimile device, a facsimile server device, a gateway device, and a protocol conversion device and is connected to an integrated digital communication network (ISDN) or a packet switching network (PSDN) to send and receive information,
A means for recognizing the destination address in the incoming packet from the PSDN side in the gateway device connecting the DN and the PSD, means for registering predetermined address translation information and translation mode, the destination address and the address translation When the information matches, a predetermined information element is incorporated in the inter-user information of the call setup message from the ISDN side,
And an address conversion means for converting the address on the ISDN side into the address on the PSDN side, and
At the time of transmitting information to the SDN side, the address conversion is performed by using the predetermined information element incorporated in the user-to-user information when the transmission destination is the group IV facsimile apparatus or the gateway apparatus.

The invention according to claim 3 includes at least a group IV facsimile machine, a group III facsimile machine, a facsimile server machine, a gateway machine and a protocol converter, and an integrated digital communication network (ISDN) and a packet switching network ( In a communication system that transmits and receives information by connecting to PSDN), ISDN
In the gateway device that connects the
The means for recognizing the inter-user information in the call setup message from the DN side and the information in the inter-user information from the PSDN
Side call generating request packet, and address conversion means for converting the PSDN side address to the ISDN side address. When transmitting information from the ISDN side to the PSDN side, the inter-user information is used. , The address conversion is performed.

The invention according to claim 5 includes at least a group IV facsimile machine, a group III facsimile machine, a facsimile server machine, a gateway machine and a protocol converter, and an integrated digital communication network (ISDN) and a public telephone network ( PSTN), a packet switching network (PSDN) for transmitting and receiving information, and a communication system in which an automatic dialing device is provided between the group IV facsimile device and the ISDN. A means for recognizing the setting message, a means for registering a predetermined address conversion designation code, and a means for comparing the called number in the call setting message with the address information are provided, and the called number and the address information are If they match, the predetermined information is set to the user-to-user information of the call setup message Built in.

Further, according to the invention of claim 6, in a communication system in which an automatic dialing device is provided between a group IV facsimile apparatus compatible with integrated digital communication network (ISDN) and the ISDN, a call from the ISDN is provided. A parameter value included in the user information in the call establishment request message, comprising means for recognizing the establishment request message, parameter registration means for registering various parameter values, and means for converting the call establishment request message into an invalid message. Based on the above, the setting of the various parameter values is changed via the ISDN.

[0011]

In the above structure, the function of changing the address conversion method according to the destination is functioned.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. [First Embodiment] FIG. 1 is a system configuration diagram of a facsimile network system according to a first embodiment of the present invention. In the figure, 1a to 1d are CCITT X. Two
5 compatible G4 facsimile machine, 2a and 2b are ISD
N compatible G4 facsimile apparatus, 3a and 3b, G3 facsimile apparatus, 4a and 4b, automatic dialing apparatus connected between the G3 facsimile apparatus and PSTN, 5
a and 5b are X. 25 G4 facsimile machine
It is a protocol conversion device that connects to the STN and enables mutual communication with the G3 facsimile device.

Further, 6a and 6b are ISDN compatible G4
An automatic dialing device 7a, 7b connected between the facsimile device and the ISDN connects the PSTN and the PSDN, and performs address conversion between them and protocol conversion between the G3 facsimile device and the G4 facsimile device. Adapter devices 8a and 8b are gateway devices that connect ISDN and PSDN and perform address conversion between the two, 9a to 9c are small packet switches, 10a and 10b are large packet switches, and 11a and 1a.
Reference numeral 1b is a facsimile server device, 12 is a network management device for managing the entire system and accounting, 13 is a PSTN, and 14 is an ISDN.

FIG. 2 is a block diagram of the ISDN automatic dialing devices 6a and 6b shown in FIG. In the figure, 15 is a line control unit, 16 is a terminal control unit, 1
Reference numeral 7 is a memory, 18 is a CPU for controlling the entire automatic dialing device, 19 is a table for registering address conversion information, 20 is a display for displaying the state of lines and terminals, setting values of the address conversion table 19 and the like. It is a department.

FIG. 3 is a block diagram of the gateway devices 8a and 8b shown in FIG. In the figure,
21 is an ISDN control unit, 22 is an X.D. 25 control unit, 23 is RS-232C for controlling the RS terminal 40 for setting
A control unit, 24 is a memory, 25 is a CPU that controls the entire apparatus, 26 is an address conversion table, 27 is various timers, 28 is a data / byte counter for measuring the amount of transmitted / received data, and 29 is , A log memory for storing communication records, and 30 is a table for registering various conversion parameters.

Next, the operation of the facsimile network system according to this embodiment will be described. 4 is shown in FIG.
5 is a flowchart showing an operation procedure at the time of transmission in the ISDN automatic dialing devices 6a and 6b shown in FIG. ISDN automatic dialing devices 6a and 6b are
When a call setup (SETUP) message is received from the G4 facsimile apparatus 2a, 2b connected to the terminal port (step S1 in FIG. 4), the destination address of this call setup message is checked (step S2), and then, The address conversion table 19 is referred to (step S3).

As shown in FIG. 5, the address conversion table 19 is composed of an escape code (ESC), a network address (NTA) corresponding to the ESC, and other information elements (SID). Therefore, in step S4, it is determined whether the destination address includes the escape code. If the ESC registered in the address conversion table exists in the number element of the destination address of the received call setup message, the ES is registered in step S6.
The NTA corresponding to C is incorporated in the destination address of the call setup message, the original destination address- (ESC) and other information (SID), and the identifier are incorporated in the inter-user information,
Send them to the web.

On the other hand, if the ESC registered in the address conversion table does not exist in the number element of the destination address of the received call setup message, the received call setup message is sent to the network as it is (step S5). Figure 6
This is an example of address conversion in the ISDN auto-dialing device, and registration of the address conversion table is performed by ESC = 77.
7, NTA = 1234, SID = 9999,
When 777XXX is input as the called number from the G4 facsimile machine, the conversion is as shown in the figure.

In this way, it becomes possible to use the service using the user-to-user information even from a general G4 facsimile apparatus which cannot use the user-to-user information. Next, the operation at the time of reception (transmission to PSDN) from the ISDN in the gateway devices 8a and 8b, and from the PSDN to I
The operation at the time of transmission to SDN will be described. 7 to 9
Is from the ISDN of the gateway devices 8a and 8b to the PSD
6 is a flowchart showing an operation at the time of transmission to N and an operation at the time of transmission from PSDN to ISDN.

In FIG. 7, when the ISDN and PSDN gateway devices 8a and 8b receive the call setup message from the ISDN (step S6), the user-to-user information in the call setup message is checked (step S7), and the user is sent in step S8. If it is determined that there is no inter-office information, the call is disconnected as "no other party" (step S9). Further, the received call setting message includes the information between users (the determination result in step S8 is YES), and the subsequent step S10.
If it is determined that there are errors or missing information elements,
The call is disconnected due to the reason code such as "insufficient essential information element" (step S11).

If the user-to-user information in the received call setup message is correct, the X. 25 call request (C
R) packet is sent to PSDN and timer 2
At 7, the response monitoring timer is activated and writing to the log memory 29 for communication recording is started (step S1).
2). Then, it is judged whether or not there is a response from the PSDN side within a fixed time (step S13), and if there is no response, the call on the ISDN side is disconnected due to the reason code "no response from the other party" (step S13). S14).

When a disconnection instruction (CI) packet is received from the PSDN within a fixed time, the result of the connection completion determination in step S15 is NO, that is, PS is reached within a fixed time.
If no connection completion (CC) packet is received from the DN side, the cause of disconnection in the CI packet, diagnostic information, etc. are set to ISDN.
(Q.931) Cause of disconnection, converted to diagnostic information, IS
The call on the DN side is disconnected, the timer 27 is stopped, and the operation of writing the communication record in the log memory 29 is completed (step S
16).

On the other hand, when a connection completion (CC) packet is received from the PSDN side within a fixed time, it responds to ISDN.
(CONNect) message is transmitted (step S17), the timer 27 is stopped, the data byte counter 28 is activated, and then communication is started (step S20 in FIG. 8). In this way, address translation from ISDN to PSDN is possible using the inter-user information in the call setup (ISDN) message.

Next, the gateway devices 8a and 8b monitor the communication (step S21), and if it judges that the communication is completed, the data byte counter 28 is stopped and the transmission source, the destination, and the communication data capacity. The communication history such as is stored in the log memory 29 (step S22). And
The network management device 12 is called by polling, the data in the log memory 29 is transferred to the network management device 12, and the operation ends (step S23).

Next, the operation of the gateway devices 8a and 8b during transmission from PSDN to ISDN will be described.
FIG. 9 shows the PSDN in the gateway devices 8a and 8b.
3 is a flow chart showing an operation procedure when transmitting from the wireless LAN to the ISDN. In the figure, gateway devices 8a and 8b
Receives the CN packet from the PSDN (step S30), the destination address (DA) in the CN packet
Is checked and the address conversion table 26 is referred to (step S31).

FIG. 10 shows the gateway device 8 shown in FIG.
It is a figure which shows the structure of the address conversion table of a, 8b, and the address conversion table 26 is comprised by the priority corresponding to each, an incoming address, an outgoing address, and a conversion mode. Then, if it is determined in step S32 that D / A in the received CN packet is not registered in the incoming address of the address conversion table 26, this D / A is used as the called number of the ISDN call setup message. (Step S33).

On the other hand, D / A in the received CN packet
Is registered as the incoming address of the address conversion table 26 (determined in step S32 is YE
S), referring to the conversion mode of the same table, if it is not the gateway mode (the determination result of step S34 is N
O), the outgoing address in the table is transmitted to the network as the called number of the ISDN call setup message (step S35).

When the conversion mode is the gateway mode (YES in the determination result in step S34), the outgoing address in the table is used as the called number of the ISDN call setup message, and D in the received CN packet is used.
-A and the identifier are incorporated into the inter-user information of the call setup message and transmitted (step S36). In addition, in FIG.
This is an example of address conversion from PSDN to ISDN of the gateway devices 8a and 8b, and is an actual conversion example when the address conversion table 26 has the settings shown in FIG.

If there is no response within a fixed time after the call setup message is transmitted to the ISDN, or if a disconnection message is received, the cause of disconnection of ISDN (Q.931) and the diagnostic information are X. The cause of disconnection and the diagnostic information of 25 are converted, the CQ packet is transmitted to the PSDN, and the communication is ended (step S38). When the ISDN call connection is completed normally, the CA packet is transmitted to the PSDN, and the processes of steps S20 to S23 of FIG. 8 are executed.

As described above, according to this embodiment,
Facsimile network system PSDN to I
When transmitting information to SDN, different address conversion is performed by the other device, either the G4 facsimile device or the same gateway device. 1) It is possible to reduce unnecessary communication cost by adding information between users. 2) When transmitting information from ISDN to PSDN, when the user-to-user information of the ISDN call setup message is used for address translation, the center side configuration becomes flexible and call setup is performed even if there is an error in the transmission information. Communication charges are not required because it is not completed. 3) When the required number is included in the user-to-user information of the call setup message when the called number of the call setup message received from the terminal matches the conversion designation code registered in the table. , It is possible to use the user-to-user information in the call setup message even with a general ISDN compatible G4 facsimile machine that does not have special specifications. There is an effect that becomes. [Second Embodiment] A second embodiment according to the present invention will be described below.

FIG. 12 is a block diagram of the automatic dialing device according to the second embodiment of the present invention. In the figure, the automatic dialing device 50 includes a line controller 51.
Connected to the ISDN 57 via the terminal control unit 5
2 is a terminal 56 (ISDN-compatible G
4 facsimile machine) is controlled. In addition, the CPU 54
Is a central control unit for controlling the entire apparatus, and is a memory 5
It operates according to the program stored in 3. Various parameter values are registered in the parameter table 55.

Next, the operation of the automatic dialing device according to this embodiment when setting parameters will be described. Figure 1
FIG. 3 is a flowchart showing an operation procedure at the time of parameter setting in the automatic dialing device according to the present embodiment.
The CPU 54 shown in FIG. 12 executes step S51 of FIG.
Then, when receiving a call from ISDN 57 (SETUP reception),
The area of the information between users of the SETUP message is checked (step S52). If it is determined in step S53 that there is no user-to-user information, or even if there is user-to-user information, it is determined in step S54 that there is no identifier in the user-to-user information indicating a call for setting. If this is the case, the received SETUP
The message is sent to the terminal as it is (step S5).
5).

Further, the CPU 54 checks the parameter value in the inter-user information (step S56), and if the value is normal, changes the corresponding parameter in the parameter table 55 (step S57). On the other hand, if the parameter value in the user-to-user information is an invalid value,
The CPU 54 does not change the parameter table 55, converts the received SETUP message into an invalid message, transmits it to the terminal 56, and the subsequent processing is performed by the terminal 5
This process is terminated after being left to 6.

As described above, according to this embodiment,
By using the inter-user information in the SETUP message to set and change various parameters via ISDN, it is not necessary to connect an input key or floppy device for setting and changing parameters to the device itself. The device can be downsized and simplified. Further, since it is not necessary to move the device for parameter setting, the setting work can be speeded up.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0036]

As described above, according to the present invention,
By changing the address conversion method between the PSDN and the ISDN according to the type of the other party's device, there is an effect that it is possible to prevent unnecessary communication costs from being generated. In addition, by changing the setting of various parameters via ISDN using the information between users of the call establishment request message, there is an effect that the setting can be changed easily and the device can be downsized.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a facsimile network system according to a first embodiment of the present invention.

[Fig. 2] Auto dialing devices 6a, 6b for ISDN
It is a block configuration diagram of.

FIG. 3 is a block configuration diagram of gateway devices 8a and 8b.

FIG. 4 is an ISDN automatic dialing device 6a, 6b.
5 is a flowchart showing an operation procedure at the time of transmission.

FIG. 5 is a diagram showing a configuration example of an address conversion table in an ISDN automatic dialing device.

FIG. 6 is a diagram showing an example of address conversion in an ISDN automatic dialing device.

FIG. 7: ISDN to P of gateway devices 8a and 8b
It is a flow chart which shows operation at the time of transmission to SDN.

FIG. 8 is a diagram of ISDN of gateway devices 8a and 8b.
It is a flow chart which shows operation at the time of transmission to SDN.

FIG. 9 is a PSDN in the gateway devices 8a and 8b.
3 is a flow chart showing an operation procedure when transmitting from the wireless LAN to the ISDN.

FIG. 10 is a diagram showing a configuration of an address conversion table of the gateway devices 8a and 8b.

FIG. 11 is a diagram showing an example of address conversion from the PSDN to the ISDN of the gateway devices 8a and 8b.

FIG. 12 is a block configuration diagram of an automatic dialing device according to a second embodiment of the present invention.

FIG. 13 is a flowchart showing an operation procedure at the time of parameter setting in the automatic dialing device according to the second embodiment.

[Explanation of symbols]

8a, 8b Gateway device for connecting ISDN and PSDN 9a-9c Small packet switch 10a, 10b Large packet switch 11a, 11b Facsimile server device 12 Network management device 21 Line (ISDN) control unit 22 Line (PSDN: X.25) control Section 23 RS-232C control section 24,53 memory 25,54 CPU 26 address conversion table 27 timer 28 data byte counter 29 log memory 30 parameter table

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 8529-5K H04L 11/20 102 A

Claims (6)

[Claims] 1. An integrated digital communication network (ISD) including at least a group IV facsimile device, a facsimile server device, a gateway device, and a protocol conversion device.
N), means for recognizing a destination address in a call-in packet from the PSDN side in a gateway device connecting ISDN and PSDN in a communication system for transmitting and receiving information by connecting to a packet switching network (PSDN), Means for registering predetermined address translation information and translation mode, and when the destination address and the address translation information match, incorporating a predetermined information element in the inter-user information of the call setup message from the ISDN side, and It is provided with address conversion means for converting the address on the ISDN side to the address on the PSDN side, and when the information is transmitted from the PSDN side to the ISDN side, whether the transmission destination is a group IV facsimile device or a gateway device, it is included in the information between users. The address conversion is performed by using the predetermined information element. Communication system that. 2. The address translation means sets the disconnection cause / diagnosis information of the ISDN as X.X in the packet level protocol of PSDN. The communication system according to claim 1, wherein the recovery request packet of 25 is converted into disconnection reason / diagnosis information. 3. A group IV facsimile device, a group III facsimile device, a facsimile server device, a gateway device, and a protocol conversion device, which are connected to an integrated digital communication network (ISDN) or packet switching network (PSDN) to send and receive information. In the communication system for performing the following: means for recognizing user-to-user information in a call setup message from the ISDN side in a gateway device connecting ISDN and PSDN, and a call request packet on the PSDN side from the information in the user-to-user information And an address conversion unit that converts an address on the PSDN side into an address on the ISDN side, and when the information is transmitted from the ISDN side to the PSDN side, the address conversion is performed using the inter-user information. A communication system characterized by the above. 4. The address translating means is one of X.X.X. 4. The communication system according to claim 3, wherein the disconnection cause / diagnosis information of the disconnection instruction packet of 25 is converted into the disconnection reason / diagnosis information of ISDN. 5. At least a group IV facsimile machine,
Group III facsimile machine, facsimile server machine, gateway machine, protocol converter, integrated digital communication network (ISDN), public telephone network (PST)
N), connecting to a packet switching network (PSDN) to send and receive information,
In a communication system in which an automatic dialing device is provided between the device and a DN, a means for recognizing a call setup message from the group IV facsimile device, a means for registering a predetermined address translation designation code, and A communication system comprising means for comparing a called number and the address information, wherein predetermined information is incorporated into user-to-user information of the call setup message when the called number and the address information match. 6. A communication system in which an automatic dialing device is provided between an integrated digital communication network (ISDN) compatible group IV facsimile device and the ISDN, and means for recognizing a call establishment request message from the ISDN. Parameter registration means for registering various parameter values, and means for converting the call establishment request message into an invalid message, based on the parameter value included in the user information in the call establishment request message, via the ISDN A communication system characterized in that the setting of various parameter values is changed.