JPH0983575A - Network connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mutually call each other between LAN terminals and ISDN terminals and to easily manage addresses. SOLUTION: The plural ISDN terminals 4 connected to an ISDN 3, the plural LAN terminals 2 connected to a LAN 1 and a network connection device 5 connecting the ISDN and the LAN are provided. The respective LAN terminals 2 are provided with call request parts 23 transmitting a call request message including terminal designation information designating the ISDN terminals 4 to the network connection device 5 as the call request message of a LAN communication control procedure between its own terminal and the network connection device 5. The network connection device 5 is provided with a connection call part 52 receiving the call request message including terminal designation information from a call request part 23 and transmitting terminal designation information to the ISDN 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network connection system for mutual communication between a LAN terminal and an ISDN terminal via a network connection device connected to a LAN and an ISDN.

[0002]

2. Description of the Related Art In recent years, IS has been used as a communication network in an advanced information society.
DN (Service Comprehensive Digital Network) was implemented, and this IS
Various ISDN communication devices for DN have been used. In addition, with the spread of computers, LAN (Local Area Network) has become a particularly important information communication network within companies.
k) is used.

Computers distributed in the area are LANs
Is connected to each other through a communication line, and information in the company is used. Further, a terminal (ISDN terminal) in which ISDN and LAN are mutually connected and connected to ISDN.
And a terminal (LAN terminal) connected to the LAN can provide a more advanced communication service. In this case, in order to connect the ISDN and the LAN, mutual terminals of the ISDN terminal and the LAN terminal are designated.

As a known technique of this type, for example, Japanese Patent Laid-Open No.
There is -326226. In this known technique, the ISDN terminal adds the identification information of the LAN terminal to the destination subaddress of the ISDN communication control procedure or the user information of the user, and the ISDN is added.
Then, the connection device receives the identification information from the ISDN and designates the LAN terminal.

[0005]

However, in the above-mentioned known technique, the ISDN terminal makes a call to the LAN terminal.
The terminal could not call the ISDN terminal. Further, the connection device has an address conversion table that performs mutual conversion between the identification information used to identify the LAN terminal under its own device and the actual IP address. A connection device having this address conversion table may be connected to a groupware server that manages addresses.

In this case, the groupware server manages the address and the address conversion table in the connection device further manages the address. That is, since the address is managed at two places, the address management becomes complicated.

An object of the present invention is to provide a network connection system in which calls can be mutually made between a LAN terminal and an ISDN terminal and addresses can be easily managed.

[0008]

The network connection system of the present invention adopts the following means in order to solve the above problems.

<Summary of the Network Connection System of the Present Invention> As shown in FIG. 1, the network connection system of the present invention includes a plurality of ISDN terminals connected to the ISDN and L
It is provided with a plurality of LAN terminals connected to the AN, and a network connection device for mutually connecting the ISDN and the LAN for mutual communication between the respective ISDN terminals and the respective LAN terminals.

Each of the LAN terminals sends to the network connection device a call request message including terminal designation information for designating an ISDN terminal as a call request message of a LAN communication control procedure between its own terminal and the network connection device. It has a call request unit for sending. The network connection device receives the call request message to which the terminal designation information is added from the call request unit and receives the terminal designation information from the ISD.
It has a connection calling unit for calling N (corresponding to claim 1).

According to the present invention, the call requesting unit includes the call requesting message including the terminal specifying information for specifying the ISDN terminal as the call requesting message of the LAN communication control procedure between the own terminal and the network connecting device. When the message is sent to the network connection device, the connection calling unit receives the call request message to which the terminal designation information is added from the call request unit, and calls the terminal designation information to ISDN. As a result, the LAN terminal calls the designated ISDN terminal.

The present invention can also be realized by adding the following additional components. With the additional component, the terminal designation information included in the call request message transmitted by the call request unit is ISDN identification information (corresponding to claim 2).

The additional component is a LAN address in which the terminal designation information included in the call request message sent by the call request unit corresponds to the ISDN identification information of the ISDN terminal of the other party. The network connection device includes a conversion table that converts the LAN address into ISDN identification information, and an address conversion unit that reads out the ISDN identification information corresponding to the LAN address from the call requesting unit from the conversion table. The connection calling unit calls the ISDN identification information from the address conversion unit to ISDN (corresponding to claim 3).

According to the present invention, when the calling request unit sends a calling request message including the LAN address corresponding to the ISDN identification information of the ISDN terminal of the other party, the address conversion unit causes the LAN from the calling request unit. The ISDN identification information corresponding to the address is read from the conversion table. The connection calling unit uses the ISDN identification information from the address conversion unit as an IS.
Make a call to DN.

The present invention also provides a plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. And a network connection device for mutually connecting.

Each of the ISDN terminals is an IS of its own terminal.
It has a calling unit for sending a call setup message including DN identification information to the ISDN. The network connection device receives the call setup message including the ISDN identification information from the ISDN, and receives the LA between the own device and the LAN terminal.
As the call request message of the N communication control procedure, the I
It has a call request unit for sending a call request message including SDN identification information to the LAN terminal (corresponding to claim 4).

According to the present invention, when the calling unit sends a call setup message including the ISDN identification information of its own terminal to the ISDN, the call request unit receives the call setup message including the ISDN identification information from the ISDN and receives the call setup message. Device and LAN
A call request message including the ISDN identification information is sent to the LAN terminal as a call request message for the LAN communication control procedure with the terminal.

The present invention also provides a plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. And a network connection device for mutually connecting.

Each of the ISDN terminals sends a call setup message containing ISDN identification information assigned to the network connection device to the ISDN, and an ISDN.
L which should be received as user user information of communication control procedure
And a sending unit for sending the user information including the LAN terminal designating information designating the AN terminal to the ISDN.

The network connection device is the ISD.
Based on the N identification information, L is sent from the sending unit via ISDN.
It has a call request unit for inputting AN terminal specifying information and making a call request to a LAN terminal corresponding to the LAN terminal specifying information (corresponding to claim 5).

According to the present invention, the calling section sends a call setup message including the ISDN identification information assigned to the network connection device to the ISDN, and the sending section should receive the call as user user information of the ISDN communication control procedure. LA
User information including LAN terminal designation information for designating N terminals is sent to the ISDN. The call request part is ISDN
Based on the identification information, the LA is sent from the sending unit via ISDN.
The N terminal designation information is input and a call request is made to the LAN terminal corresponding to the LAN terminal designation information. As a result, ISD
The N terminal makes a call to the designated LAN terminal.

As an additional component, the LAN terminal designation information included in the user information sent by the sending unit is LAN identification information (corresponding to claim 6). As an additional component, the call request unit inquires of each LAN terminal whether or not the LAN identification information from the transmission unit matches the LAN identification information of each LAN terminal (claim 7).
Corresponding to).

As an additional component, an address conversion unit for converting the LAN identification information of the LAN terminal to receive the call into the LAN address of the LAN terminal to receive the call is further provided. The network connection device is from ISDN to LAN
A reading unit is provided which receives the user information including the identification information and reads the LAN address corresponding to the LAN identification information from the address conversion unit.

The call request unit makes a call request to the LAN terminal corresponding to the LAN address read by the reading unit (corresponding to claim 8). According to the invention,
When the reading unit receives the user user information including the LAN identification information from the ISDN and reads the LAN address corresponding to the LAN identification information from the address conversion unit, the call request unit is the LAN corresponding to the read LAN address.
Make a call request to the terminal. As a result, the ISDN terminal calls the designated LAN terminal.

The present invention also includes a plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. And a network connection device for connecting each other to each other, and an address conversion unit for converting the subaddress of the ISDN communication control procedure into the LAN address of the LAN terminal to receive the call.

Each of the ISDN terminals has a sending section for adding the ISDN identification information assigned to the network connection device and the identification information for designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sending the ISDN. Have.

The network connection device receives the sub address from the ISDN and receives the LAN corresponding to the sub address.
A read unit that reads an address from the address conversion unit and a call request unit that makes a call request to a LAN terminal corresponding to the read LAN address (claim 9)
Corresponding to).

According to the present invention, when the sending unit adds the ISDN identification information assigned to the network connection device and the identification information designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sends it to the ISDN,
The reading unit receives the sub address from the ISDN and reads the LAN address corresponding to the sub address from the address conversion unit. The call request unit makes a call request to the LAN terminal corresponding to the read LAN address. As a result, the ISDN terminal calls the designated LAN terminal.

Further, the network connection device is a plurality of ISs.
An ISDN to which a DN terminal is connected and a LAN to which a plurality of LAN terminals are connected to each other.
As a call request message of a LAN communication control procedure between a terminal and a network connection device, when a call request message including terminal designating information designating an ISDN terminal is sent from the LAN terminal, the terminal designating information is sent. It has a connection calling unit for calling ISDN.
Corresponding to).

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a network connection system of the present invention will be described below with reference to the drawings. <First Embodiment of the Invention> FIG. 2 is a block diagram showing a network connection system according to a first embodiment of the present invention. In FIG. 2, a LAN terminal 2a having a LAN network interface is connected to LAN1 and ISDN3
An ISDN terminal 4a having an ISDN network interface is connected to. LAN1 and ISDN3
A network connection device 5a, which is also called a network converter NWC, is connected to and.

The LAN terminal 2a includes an initial setting unit 21a, a partner information registration unit 22a, and a call requesting unit 23a. The initial setting unit 21a sets the physical address of its own terminal, its own IP address, and the IP address of the network connection device to which its LAN terminal 2a is connected via the LAN1. FIG. 3 shows IP address setting and ISDN number registration according to the first embodiment.

The other party information registration section 22a registers the ISDN number of the other party's ISDN terminal 4a to be communicated with. The call origination requesting unit 23a, in the call origination request message of the LAN communication control procedure (LAN-based communication protocol) between its own terminal 2a and the network connection device 5a, the other party The call request message with the ISDN number added is sent to the network connection device 5a via the LAN 1. The call requesting unit 23a also sends the IP address of its own LAN terminal 2a and the IP address of the network connecting device set by the initial setting unit 21a to the network connecting device 5a.

The network connection device 5a includes an initial setting section 51a and a connection calling section 52a. Initial setting section 51
a sets the IP address of itself and the IP address of the LAN terminal 2a under its control. Connection calling unit 52a
Uses the IP address of its own LAN terminal set by the initial setting unit 51a and the IP address of the LAN terminal 2a under its own control from the call requesting unit 23a.
The P address and the IP address of the network connection device 5a to be used are compared.

The connection call origination unit 52a includes the call origination request unit 23.
When the IP address from a matches the set IP address, the call request message with the ISDN number added is received from the call request unit 23a and the ISDN number is set to I.
Make a call to SDN3.

Next, the operation of the first embodiment having such a configuration will be described with reference to the call control sequence shown in FIG.
Here, as an example, the ISDN number is “5000”. First, the call setup procedure will be described. The initial setting unit 21a in the LAN terminal 2a uses '98.
1.0.2 'is set, and '98 .1.0.1' is set as the IP address of the network connection device 5a. LAN terminal 2a
When the call requesting unit 23a therein makes a call request to the network connecting device 5a by the call request message to which the ISDN number (5000) is added, the network connecting device 5a receives the I
The call request message to which the SDN number (5000) is added is received. The network connection device 5a notifies the LAN terminal 2a that the call request has been accepted.

When the connection calling unit 52a in the network connection device 5a sets a call to the exchange 31 in the ISDN 3 by a call setup message to which the ISDN number (5000) is added, the exchange 31 accepts the call setup. This is notified to the network connection device 5a.

The exchange 31 calls the ISDN terminal 4a corresponding to the ISDN number (5000). During a call, a call message is sent from the ISDN terminal 4a via the exchange 31 to the network connection device 5a.

When the ISDN terminal 4a responds,
A response message is sent from the ISDN terminal 4a via the exchange 31 to the network connection device 5a. Furthermore, L
LAN by sending a response message to the AN terminal 2a
The terminal 2a confirms the response. As a result, the LAN terminal 2 and the ISDN terminal 4a are connected and communication is started.

Next, the release procedure will be described. When the communication is completed, first, the LAN terminal 2a sends a disconnection message to the network connection device 5a. The network connection device 5a notifies the LAN terminal 2a that the disconnection message has been received.

When the network connection device 5a sends the received disconnection message to the ISDN3, the ISDN3 disconnects the communication path. The ISDN terminal 4a sends a release message to the network connection device 5a via the exchange 31. Then, the network connection device 5a sends a release completion message to the ISDN terminal 4a via the exchange 31. This ends the call.

As described above, in the first embodiment, the partner information registration unit 22a of the LAN terminal 2a uses the ISD as the partner information.
Only the N number is registered, and the network connection device 5
a does not need to have an address conversion table, and does not need an address conversion server. Therefore, while the LAN terminal 2a can make a call to the ISDN terminal 4a,
Address management is easy. <Second Embodiment of the Invention> Next, a second embodiment of the present invention will be described. FIG. 5 is a configuration diagram showing a network connection system according to the second embodiment of the present invention. In FIG. 5, LA
LAN terminal 2b is connected to N1 and I is connected to ISDN3.
The SDN terminal 4b and the network connection device 5c are connected.

A LAN terminal 2c and a LAN terminal 2d are connected to the network connection device 5c. LAN1 and IS
A network connection device 5b is connected to the DN3.

The LAN terminal 2b includes an initial setting unit 21b, a partner information registration unit 22b, and a call requesting unit 23b. The initial setting unit 21b sets the physical address of its own terminal 2b, its own IP address, and the IP address of the network connection device 5b. In FIG. 6, the partner of the second embodiment is LA
The setting and registration of the IP address and the ISDN conversion in the case of the N terminals 2c and 2d are shown. Embodiment 2 in FIG.
Shows the setting and registration of the IP address and the ISDN conversion when the other party is the ISDN terminal 4b.

The other party information registration unit 22b receives the IDN of the other party's ISDN terminal 4b or LAN terminal 2c, 2d to be communicated.
Register the P address. The call requesting unit 23b, in the call request message of the LAN communication control procedure between its own terminal and the network connection device 5b, is the ISDN terminal 4b or LAN terminal 2c of the other party registered in the other party information registering unit 22b. , 2d and the call request message to which the IP address is added is sent to the network connection device 5b. In addition, the call requesting unit 23b determines the I of the LAN terminal 2b of its own set by the initial setting unit 21b.
The P address and the IP address of the network connection device 5b are sent to the network connection device 5b.

The network connection device 5b includes an initial setting section 51b, a connection calling section 52b, a conversion table 53b, and an address conversion section 54b. The initial setting unit 51b sets its own IP address and the IP address of the LAN terminal 2b under its control.

The conversion table 53b, as shown in FIG.
The IP address and the ISDN number are stored in association with each other for each IP address, and are stored in a memory (not shown). The address conversion unit 54b is the network connection device 5
The ISDN number corresponding to the IP address from b is read from the conversion table 53b and output to the connection calling unit 52b.

The connection calling unit 52b uses the IP address of its own set by the initial setting unit 51b and the IP address of the terminal under its own control as the IP address of its own LAN terminal from the call requesting unit 23b. Match with the IP address of the network connection device.

The connection calling section 52b is connected to the calling request section 23.
When the IP address from b matches the set IP address, the call request message with the IP address added is received from the call requesting unit 23b, and the ISDN number from the address converting unit 54b and the IP at that time are received. The address is called to ISDN3.

The network connection device 5c includes an initial setting section 51c and a connection calling section 52c. Initial setting section 51
In c, the IP address of itself and the IP addresses of the LAN terminals 2c and 2d under its control are set. Connection calling unit 5
2c receives the IP address from ISDN3,
The LAN terminals 2c and 2d corresponding to the address are called.

The LAN terminals 2c and 2d set their own IP address and the IP address of the network connection device 5c. Next, the operation of the second embodiment having such a configuration when the partner is a LAN terminal will be described with reference to the call control sequence shown in FIG. In this case, various values are set as shown in FIG.

First, the initial setting section 21 in the LAN terminal 2b.
b sets "98.1.0.2" as its own IP address and "98.1.0.1" as the IP address of the network connection device 5b. Also, the partner information registration unit 22b
Registers "98.8.0.2" as the IP address of the destination LAN terminal 2c to be connected. This state is shown in FIG.

The call request unit 23b of the LAN terminal 2b is L
A call request is issued to the network connection device 5b by a call request message to which the IP address '98 .8.0.2 'of the AN terminal 2c is added. The network connection device 5b notifies the LAN terminal 2b that the call request has been accepted.

The connection calling unit 52b in the network connection device 5b receives the calling request message from the LAN terminal 2b to which the IP address '98 .8.0.2 'of the LAN terminal 2c is added. The address translation unit 54b is the I terminal of the LAN terminal 2c.
Figure 8 shows the ISDN number corresponding to P address '98 .8.0.2 '.
It is read from the conversion table 53b shown in FIG.

Here, the address conversion unit 54b is the ISD.
N number (3000) and IP address of LAN terminal 2c '98 .8.
0.2 'is output to the connection calling unit 52b. Connection calling unit 52
b is an IS by the call setup message including the ISDN number (3000) and the IP address '98 .8.0.2 'of the LAN terminal 2c.
When the call setup is performed for the exchange in the DN 3, the exchange notifies the network connection device 5b that the call setup has been accepted.

The exchange calls the network connection device 5c corresponding to the ISDN number (3000), and the connection calling unit 52c in the network connection device 5c uses the IP of the LAN terminal 2c.
The LAN terminal 2c is called by the address '98 .8.0.2 '. Subsequent response processing and disconnection processing are the same as those in the first embodiment.

Next, the operation of the second embodiment when the partner is an ISDN terminal will be described with reference to the call control sequence shown in FIG. In this case, various values are set as shown in FIG.

In this example, the ISDN of the ISDN terminal 4b is
It is assumed that the number is "5000" and the IP address is "98.6.0.1". First, the initial setting unit 21 in the LAN terminal 2b
b sets "98.1.0.2" as its own IP address and "98.1.0.1" as the IP address of the network connection device 5b. Also, the partner information registration unit 22b
Registers '98 .6.0.1 'as the IP address of the ISDN terminal 4b of the other party to be connected. This state is shown in FIG.

The call requesting unit 23b of the LAN terminal 2b uses the I
A call request is issued to the network connection device 5b by a call request message to which the IP address "98.6.0.1" of the SDN terminal 4b is added. The network connection device 5b notifies the LAN terminal 2b that the call request has been accepted.

The connection calling unit 52b in the network connection device 5b uses the IP address "98.6.0.1" of the ISDN terminal 4b.
The call request message to which is added is received. The address conversion unit 54b uses the IP address of the ISDN terminal 4b '98.
The ISDN number corresponding to 6.0.1 'is read from the conversion table 53b shown in FIG.

Here, the address conversion unit 54b uses the ISD.
The N number (5000) is output to the connection calling unit 52b. When the connection calling unit 52b sets a call to the exchange in the ISDN 3 by a call setup message including the ISDN number (5000), the exchange notifies the network connection device 5b that the call setup has been accepted.

The exchange has an I corresponding to the ISDN number (5000).
Call the SDN terminal 4b. Subsequent response processing and disconnection processing are the same as those in the first embodiment. Thus, in the second embodiment, the partner information registration unit 22 of the LAN terminal 2b registers the IP address as the partner information, and the network connection device 5b has a conversion table. Therefore, L
While making a call from the AN terminal to the ISDN terminal,
No address translation server is required, and address management is easy. <Third Embodiment of the Invention> Next, a third embodiment of the present invention will be described. FIG. 11 shows a configuration diagram of the third embodiment of the network connection system of the present invention.

In the third embodiment, I connected to ISDN3
SDN terminal 4c and multiple LANs connected to LAN1
It is provided with terminals 2e and 2f, and a network connection device 5c for mutually connecting the ISDN 3 and the LAN.

In the third embodiment, from the ISDN terminal 4c to LA
The N terminal 2e, 2f is characterized in that the incoming call. Said I
The SDN terminal 4c has a calling unit 41c that sends out a call setup message including the ISDN number of its own terminal to the ISDN 3. The network connection device 5c uses the ISD.
A call setup message including an ISDN number is received from N3, and LA between the own device and the LAN terminals 2e and 2f.
As the call request message of the N communication control procedure, the I
The LAN terminal 2 sends a call request message including the SDN number.
It has a call request unit 55c for sending to e and 2f.

Next, the operation of the third embodiment will be described with reference to the call control sequence shown in FIG. First, the calling unit 41c in the ISDN terminal 4c is the IS of the own ISDN terminal 4c.
IS the call setup message containing the DN number (eg 1000)
Send to DN3.

The call requesting unit 55c sends ISDN3 to ISD.
LAN between the own device 5c and the LAN terminals 2e and 2f by receiving the call setup message including the N number (1000)
As the call request message of the communication control procedure, the IS
The LAN terminal 2 sends a call request message including the DN number.
e, 2f.

Therefore, the ISDN number (1000) can be called from the ISDN terminal 4c to the LAN terminals 2e and 2f. <Fourth Embodiment of the Invention> Next, a fourth embodiment of the present invention will be described. FIG. 13 shows a configuration diagram of a fourth embodiment of the network connection system of the present invention.

In the fourth embodiment, I connected to ISDN3
SDN terminal 4d and multiple LANs connected to LAN1
It is provided with terminals 2e and 2f, and a network connection device 5d for mutually connecting the ISDN 3 and the LAN 1.

The ISDN terminal 4d has a partner information registration section 42d for registering the ISDN number assigned to the network connection device 5d and the identification number of the LAN terminal for designating the LAN terminal to receive the call.

The ISDN terminal 4d sends a call setting message including the ISDN number assigned to the network connection device 5d to the ISDN 3 to generate a calling section 43d.
And a sending unit 44d for sending to the ISDN 3 the user user information UUI including the identification number of the LAN terminal that specifies the LAN terminal that should receive the call, as the user user information UUI of the ISDN communication control procedure.

The network connection device 5d has the I
The sending unit 44 based on the SDN number via the ISDN3
It has a call requesting unit 55d which inputs the identification number of the LAN terminal from d and makes a call request to the LAN terminal corresponding to the identification number of the LAN terminal.

The network connection device 5d has an initial setting section 51d for setting its own IP address and the IP address of a subordinate terminal. The LAN terminals 2e and 2f also set their own IP address and the IP address of the network connection device 5d to be used.

FIG. 14 shows initial setting and registration of partner information in each terminal and network connection device. Next, a fourth embodiment according to the call control sequence shown in FIG.
Will be described. First, the partner information registration unit 42d registers the ISDN number assigned to the network connection device 5d and the identification number of the LAN terminal that specifies the LAN terminal that should receive the call, and the calling unit 43d in the ISDN terminal 4d causes the network connection device 4d to register. The ISDN3 call setup message containing the ISDN number (eg 3000) assigned to 5d
To send to.

Next, the sending unit 44d sends to the ISDN 3 the user user information UUI including the identification number (eg 01) of the LAN terminal 2e designating the LAN terminal to receive the call as the user user information of the ISDN communication control procedure.

Further, the call request part 55d in the network connection device 5d is based on the ISDN number (3000) and
The identification number (01) of the LAN terminal 2e is input from the sending unit 44d via the DN3. The call request unit 55d issues a call request to all LAN terminals to inquire whether the identification number (01) of the LAN terminal 2e and the identification number of each LAN terminal match.

In response to this call request, the sending unit 44d
Therefore, the LAN terminal 2e having an identification number that matches the identification number (01) of the LAN terminal 2e returns a response. After that, the ISDN terminal 4d makes a call to the designated LAN terminal 2e. The subsequent processing is the same as the processing in the first embodiment.

As described above, according to the fourth embodiment, the IS
The DN terminal 4d only has an ISDN number and an identification number,
The network connection device 5d does not have a translation table and does not need to have an address translation server. Therefore,
Address management is easy. <Fifth Embodiment of the Invention> Next, a fifth embodiment of the present invention will be described. FIG. 16 shows a configuration diagram of the fifth embodiment of the network connection system of the present invention.

In the fifth embodiment, I connected to ISDN3
SDN terminal 4e and multiple LANs connected to LAN1
The terminals 2e and 2f, the network connection device 5e that mutually connects the ISDN 3 and the LAN 1, and the L that is connected to the LAN 1 and should receive the subaddress of the ISDN communication control procedure
An address conversion server 7e for converting the LAN address of the AN terminal is provided. The contents of the address translation server 7e are shown in FIG.

The ISDN terminal 4e has a partner information registration section 42e for registering the ISDN number assigned to the network connection device 5e and the identification number for designating the LAN terminal to receive the call.

The ISDN terminal 4e adds the ISDN number assigned to the network connection device 5e and the identification number designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sends the ISDN 3 to the ISDN 3. Have.

The network connection device 5e is an ISD.
A reading unit 56e that receives a sub address from N3 and reads an IP address corresponding to the sub address from the address translation server 7e, and a call request unit 55 that makes a call request to the LAN terminal corresponding to the read IP address.
with e.

Further, the network connection device 5e is
It has an initial setting unit 51e for setting its own IP address and the IP address of a subordinate terminal. LAN terminals 2e, 2f
The address translation server 7e sets its own IP address and the IP address of the network connection device 5e to be used.

FIG. 17 shows initial setting and registration of partner information in each terminal and network connection device. Next, the operation of the fifth embodiment will be described with reference to the call control sequence shown in FIG. First, the partner information registration unit 42e determines the ISDN number (eg,
3000) and the identification number (01) of the LAN terminal that specifies the LAN terminal 2e that should receive the call, the sending unit 44e identifies the ISDN number (3000) assigned to the network connection device 5e and the LAN terminal 2e that should receive the call. The specified identification number (01) is added to the subaddress of the ISDN communication control procedure and sent to ISDN3.

The network connection device 5e receives the subaddress including the ISDN number (3000) and the identification number (01). The reading unit 56e sends the IP address corresponding to the subaddress from the ISDN 3 to the address translation server 7e.
Read from

Here, according to the table of the address translation server 7e shown in FIG.
It is converted to P address '98 .8.0.2 '. Call request part 5
5e makes a call request to the LAN terminal 2e corresponding to the read IP address '98 .8.0.2 '. As a result, IS
The DN terminal 4e makes a call to the designated LAN terminal 2e.

As described above, in the fourth embodiment, ISDN is used.
The partner information registration unit 22e of the terminal 4e uses IS as the partner information.
It has a DN number and an identification number. Also, since only the address translation server 7e is provided, the ISDN terminal
It is possible to make a call to the AN terminal, the network connection device does not need a conversion table, and address management is simple. <Sixth Embodiment of the Invention> Next, a sixth embodiment of the present invention will be described. FIG. 20 shows a configuration diagram of the sixth embodiment of the network connection system of the present invention.

In the sixth embodiment, I connected to ISDN3
SDN terminal 4f and multiple LANs connected to LAN1
The terminals 2e and 2f, the network connection device 5f that mutually connects the ISDN 3 and the LAN 1, and the L that is connected to the LAN 1 and should receive the subaddress of the ISDN communication control procedure
An address conversion server 7f for converting the LAN address of the AN terminal is provided. The contents of the address translation server 7f are shown in FIG.

The ISDN terminal 4f has a partner information registration section 42f for registering the ISDN number assigned to the network connection device 5f and the LAN terminal identification number designating the LAN terminal to receive the call.

The ISDN terminal 4f sends a call setup message including a ISDN number assigned to the network connection device 5f to the ISDN 3 to generate a calling section 43f.
And a sending unit 44f for sending to the ISDN 3 the user user information UUI including the identification number of the LAN terminal that specifies the LAN terminal that should receive the call, as the user user information UUI of the ISDN communication control procedure.

The network connection device 5f has an initial setting section 51f for setting its own IP address and the IP address of a subordinate terminal. The network connection device 5
The f includes a reading unit 56f that receives user user information including the identification number of the LAN terminal from the ISDN 3 and reads the IP address corresponding to the identification number of the LAN terminal from the address conversion server 7f. The call request unit 55f is
A call request is issued to the LAN terminal corresponding to the IP address read by the reading unit 56f. LAN terminal 2
e, 2f and the address translation server 7f also set their own IP address and the IP address of the network connection device 5f to be used.

FIG. 21 shows initial setting and registration of partner information in each terminal and network connection device. Next, a sixth embodiment according to the call control sequence shown in FIG.
Will be described. First, the partner information registration unit 42f registers the ISDN number (for example, 3000) assigned to the network connection device 5f and the LAN terminal identification number (01) that designates the LAN terminal 2e that should receive the call.

The calling unit 43f is the network connection device 5f.
Call ISDN3 with the ISDN number (3000) assigned to. Furthermore, the sending unit 44f uses the LAN that should receive the incoming call.
The user user information UUI including the identification number (01) designating the terminal 2e is sent to the ISDN 3.

The network connection device 5f receives the ISDN number (3000) and the user user information UUI including the identification number (01). The reading unit 56f is I
The IP address corresponding to the identification number (01) from SDN3 is read from the address conversion server 7f.

Here, the identification number (01) is converted into the IP address '98 .8.0.2 'by the table of the address conversion server 7f shown in FIG. The call request unit 55f makes a call request to the LAN terminal 2e corresponding to the read IP address '98 .8.0.2 '. As a result, the ISDN terminal 4
A call is made from e to the designated LAN terminal 2e.

As described above, in the fifth embodiment, ISDN is used.
The partner information registration unit 22f of the terminal 4f uses IS as the partner information.
It has a DN number and an identification number. Further, since only the address translation server 7f is provided, the ISDN terminal can
It is possible to make a call to the AN terminal, the network connection device does not need a conversion table, and address management is simple.

[0095]

According to the present invention, the calling request unit is an ISDN.
The terminal designating information designating the terminal is sent to the network connection device, and the connection calling unit receives the terminal designating information and calls the ISDN for the terminal designating information. As a result, the LAN terminal can easily make a call to the designated ISDN terminal, and since it does not have an address conversion table, address management is unnecessary.

Further, the call request unit sends out the LAN address corresponding to the ISDN identification information of the ISDN terminal of the other party, and the address conversion unit outputs the ISD corresponding to the LAN address.
The N identification information is read from the conversion table, and the connection calling unit calls the ISDN identification information from the address conversion unit to ISDN. Therefore, a call can be made from the LAN terminal to the ISDN terminal, and an address conversion server or the like is not required, and address management is easy.

When the calling section sends the ISDN identification information of its own terminal to the ISDN, the call request section receives the ISDN identification information from the ISDN and sends the call request message including the ISDN identification information to the LAN terminal. IS
The DN identification information is called to all LAN terminals.

Further, the calling unit sends the ISDN identification information assigned to the network connection device to the ISDN, and the sending unit sends the user user information including the LAN terminal designating information designating the LAN terminal to receive the call to the ISDN. . The call request unit makes a call request to the LAN terminal corresponding to the LAN terminal designation information from the sending unit. As a result, ISDN
The terminal makes a call to the designated LAN terminal, and the ISDN terminal only has the ISDN identification information and the LAN terminal designation information.
The network connection device does not have a conversion table, and
Address management is easy because there is no need to provide an address translation server.

When the reading unit receives the user user information including the LAN identification information from the ISDN and reads the LAN address corresponding to the LAN identification information from the address conversion unit, the call request unit corresponds to the read LAN address. A call request is made to the LAN terminal. As a result, I
A call is made from the SDN terminal to the specified LAN terminal, and ISDN
The terminal only has the ISDN identification information and the LAN terminal designation information, and the network connection device does not have the conversion table.
Address management is easy.

When the sending unit adds the ISDN identification information assigned to the network connection device and the identification information designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sends the ISDN to the ISDN, the reading unit reads the ISDN. The LAN address corresponding to the sub-address from is read from the address conversion unit. The call request unit makes a call request to the LAN terminal corresponding to the read LAN address. As a result, the ISDN terminal calls the designated LAN terminal, and the ISDN terminal receives the ISDN identification information and LA.
Only the N terminal designation information is provided, the network connection device does not have the conversion table, and the address management is easy.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a network connection system of the present invention.

FIG. 2 is a configuration diagram showing a first embodiment of a network connection system of the present invention.

FIG. 3 is a diagram showing setting of an IP address and registration of an ISDN number according to the first embodiment.

FIG. 4 is a diagram showing a call control sequence in the first embodiment.

FIG. 5 is a configuration diagram showing a second embodiment of the network connection system of the present invention.

FIG. 6 is a diagram showing IP address setting / registration and ISDN number conversion when the destination is a LAN terminal according to the second embodiment.

FIG. 7 is a diagram showing IP address setting and registration and ISDN number conversion when the other party is an ISDN terminal according to the second embodiment.

FIG. 8 is a diagram showing the contents of a conversion table according to the second embodiment.

FIG. 9 is a diagram showing a call control sequence when the destination is a LAN terminal according to the second embodiment.

FIG. 10 is a diagram showing a call control sequence when the other party of the second embodiment is an ISDN terminal.

FIG. 11 is a configuration diagram showing a third embodiment of the network connection system of the present invention.

FIG. 12 is a diagram showing a call control sequence in the third embodiment.

FIG. 13 is a configuration diagram showing a fourth embodiment of the network connection system of the present invention.

FIG. 14 is a diagram showing setting of an IP address and registration of an ISDN number according to the fourth embodiment.

FIG. 15 is a diagram showing a call control sequence in the fourth embodiment.

FIG. 16 is a configuration diagram showing a fifth embodiment of the network connection system of the present invention.

FIG. 17 is a diagram showing IP address setting, ISDN number registration, and IP address conversion according to the fifth embodiment.

FIG. 18 is a diagram showing the contents of a conversion table according to the fifth embodiment.

FIG. 19 is a diagram showing a call control sequence in the fifth embodiment.

FIG. 20 is a configuration diagram showing a sixth embodiment of the network connection system of the present invention.

FIG. 21 is a diagram showing IP address setting, ISDN number registration, and IP address conversion according to the sixth embodiment.

FIG. 22 is a diagram showing the contents of a conversion table according to the sixth embodiment.

FIG. 23 is a diagram showing a call control sequence in the sixth embodiment.

[Explanation of symbols]

 1..LAN 2a to 2f..LAN terminal 3..ISDN 4a to 4f..ISDN terminal 5a to 5f..network connection device 7e, 7f..address translation server 21a, 21b..initial setting unit 22a, 22b .. -Party information registration section 23a, 23b-Request calling section 31-Switch 41c-Calling section 42d-42f-Party information registration section 43d, 43f-Calling section 44d-44f-Sending section 51a- 51d, 51f .. Initial setting unit 52a, 52b, 52c .. Connection calling unit 53b .. Conversion table 54b .. Address conversion unit 55c to 55f .. Call request unit 56e, 56f .. Read unit

[Procedure amendment]

[Submission date] September 20, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Title: Network connection system

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network connection system for performing mutual communication between a LAN terminal and an ISDN terminal via a network connection device connected to a LAN and an ISDN.

[0002]

2. Description of the Related Art In recent years, IS has been used as a communication network in an advanced information society.
DN (Service Comprehensive Digital Network) was implemented, and this IS
Various ISDN communication devices for DN have been used. In addition, with the spread of computers, LAN (Local Area Network) has become a particularly important information communication network within companies.
k) is used.

Computers distributed in the area are LANs
Is connected to each other through a communication line, and information in the company is used. Further, a terminal (ISDN terminal) in which ISDN and LAN are mutually connected and connected to ISDN.
And a terminal (LAN terminal) connected to the LAN can provide a more advanced communication service. In this case, in order to connect the ISDN and the LAN, mutual terminals of the ISDN terminal and the LAN terminal are designated.

As a known technique of this type, for example, Japanese Patent Laid-Open No.
There is -326226. In this known technique, the ISDN terminal adds the identification information of the LAN terminal to the destination subaddress of the ISDN communication control procedure or the user information of the user, and the ISDN is added.
Then, the connection device receives the identification information from the ISDN and designates the LAN terminal.

[0005]

However, in the above-mentioned known technique, the ISDN terminal makes a call to the LAN terminal.
The terminal could not call the ISDN terminal. Further, the connection device has an address conversion table that performs mutual conversion between the identification information used to identify the LAN terminal under its own device and the actual IP address. A connection device having this address conversion table may be connected to a groupware server that manages addresses.

In this case, the groupware server manages the address and the address conversion table in the connection device further manages the address. That is, since the address is managed at two places, the address management becomes complicated.

An object of the present invention is to provide a network connection system in which calls can be mutually made between a LAN terminal and an ISDN terminal and addresses can be easily managed.

[0008]

The network connection system of the present invention adopts the following means in order to solve the above problems.

<Summary of the Network Connection System of the Present Invention> As shown in FIG. 1, the network connection system of the present invention includes a plurality of ISDN terminals connected to the ISDN and L
It is provided with a plurality of LAN terminals connected to the AN, and a network connection device for mutually connecting the ISDN and the LAN for mutual communication between the respective ISDN terminals and the respective LAN terminals.

Each of the LAN terminals sends to the network connection device a call request message including terminal designation information for designating an ISDN terminal as a call request message of a LAN communication control procedure between its own terminal and the network connection device. It has a call request unit for sending. The network connection device receives the call request message to which the terminal designation information is added from the call request unit and receives the terminal designation information from the ISD.
It has a connection calling unit for calling N (corresponding to claim 1).

According to the present invention, the call requesting unit includes the call requesting message including the terminal specifying information for specifying the ISDN terminal as the call requesting message of the LAN communication control procedure between the own terminal and the network connecting device. When the message is sent to the network connection device, the connection calling unit receives the call request message to which the terminal designation information is added from the call request unit, and calls the terminal designation information to ISDN. As a result, the LAN terminal calls the designated ISDN terminal.

The present invention can also be realized by adding the following additional components. With the additional component, the terminal designation information included in the call request message transmitted by the call request unit is ISDN identification information (corresponding to claim 2).

The additional component is a LAN address in which the terminal designation information included in the call request message sent by the call request unit corresponds to the ISDN identification information of the ISDN terminal of the other party. The network connection device includes a conversion table that converts the LAN address into ISDN identification information, and an address conversion unit that reads out the ISDN identification information corresponding to the LAN address from the call requesting unit from the conversion table. The connection calling unit calls the ISDN identification information from the address conversion unit to ISDN (corresponding to claim 3).

According to the present invention, when the calling request unit sends a calling request message including the LAN address corresponding to the ISDN identification information of the ISDN terminal of the other party, the address conversion unit causes the LAN from the calling request unit. The ISDN identification information corresponding to the address is read from the conversion table. The connection calling unit uses the ISDN identification information from the address conversion unit as an IS.
Make a call to DN.

The present invention also provides a plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. And a network connection device for mutually connecting.

Each of the ISDN terminals is an IS of its own terminal.
It has a calling unit for sending a call setup message including DN identification information to the ISDN. The network connection device receives the call setup message including the ISDN identification information from the ISDN, and receives the LA between the own device and the LAN terminal.
As the call request message of the N communication control procedure, the I
It has a call request unit for sending a call request message including SDN identification information to the LAN terminal (corresponding to claim 4).

According to the present invention, when the calling unit sends a call setup message including the ISDN identification information of its own terminal to the ISDN, the call request unit receives the call setup message including the ISDN identification information from the ISDN and receives the call setup message. Device and LAN
A call request message including the ISDN identification information is sent to the LAN terminal as a call request message for the LAN communication control procedure with the terminal.

The present invention also provides a plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. And a network connection device for mutually connecting.

Each of the ISDN terminals sends a call setup message containing ISDN identification information assigned to the network connection device to the ISDN, and an ISDN.
L which should be received as user user information of communication control procedure
And a sending unit for sending the user information including the LAN terminal designating information designating the AN terminal to the ISDN.

The network connection device is the ISD.
Based on the N identification information, L is sent from the sending unit via ISDN.
It has a call request unit for inputting AN terminal specifying information and making a call request to a LAN terminal corresponding to the LAN terminal specifying information (corresponding to claim 5).

According to the present invention, the calling section sends a call setup message including the ISDN identification information assigned to the network connection device to the ISDN, and the sending section should receive the call as user user information of the ISDN communication control procedure. LA
User information including LAN terminal designation information for designating N terminals is sent to the ISDN. The call request part is ISDN
Based on the identification information, the LA is sent from the sending unit via ISDN.
The N terminal designation information is input and a call request is made to the LAN terminal corresponding to the LAN terminal designation information. As a result, ISD
The N terminal makes a call to the designated LAN terminal.

As an additional component, the LAN terminal designation information included in the user information sent by the sending unit is LAN identification information (corresponding to claim 6). As an additional component, the call request unit inquires of each LAN terminal whether or not the LAN identification information from the transmission unit matches the LAN identification information of each LAN terminal (claim 7).
Corresponding to).

As an additional component, an address conversion unit for converting the LAN identification information of the LAN terminal to receive the call into the LAN address of the LAN terminal to receive the call is further provided. The network connection device is from ISDN to LAN
A reading unit is provided which receives the user information including the identification information and reads the LAN address corresponding to the LAN identification information from the address conversion unit.

The call request unit makes a call request to the LAN terminal corresponding to the LAN address read by the reading unit (corresponding to claim 8). According to the invention,
When the reading unit receives the user user information including the LAN identification information from the ISDN and reads the LAN address corresponding to the LAN identification information from the address conversion unit, the call request unit is the LAN corresponding to the read LAN address.
Make a call request to the terminal. As a result, the ISDN terminal calls the designated LAN terminal.

The present invention also includes a plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. And a network connection device for connecting each other to each other, and an address conversion unit for converting the subaddress of the ISDN communication control procedure into the LAN address of the LAN terminal to receive the call.

Each of the ISDN terminals has a sending section for adding the ISDN identification information assigned to the network connection device and the identification information for designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sending the ISDN. Have.

The network connection device receives the sub address from the ISDN and receives the LAN corresponding to the sub address.
A read unit that reads an address from the address conversion unit and a call request unit that makes a call request to a LAN terminal corresponding to the read LAN address (claim 9)
Corresponding to).

According to the present invention, when the sending unit adds the ISDN identification information assigned to the network connection device and the identification information designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sends it to the ISDN,
The reading unit receives the sub address from the ISDN and reads the LAN address corresponding to the sub address from the address conversion unit. The call request unit makes a call request to the LAN terminal corresponding to the read LAN address. As a result, the ISDN terminal calls the designated LAN terminal.

Further, the network connection device is a plurality of ISs.
An ISDN to which a DN terminal is connected and a LAN to which a plurality of LAN terminals are connected to each other.
As a call request message of a LAN communication control procedure between a terminal and a network connection device, when a call request message including terminal designating information designating an ISDN terminal is sent from the LAN terminal, the terminal designating information is sent. It has a connection calling unit for calling ISDN.
Corresponding to).

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a network connection system of the present invention will be described below with reference to the drawings. <First Embodiment of the Invention> FIG. 2 is a block diagram showing a network connection system according to a first embodiment of the present invention. In FIG. 2, a LAN terminal 2a having a LAN network interface is connected to LAN1 and ISDN3
An ISDN terminal 4a having an ISDN network interface is connected to. LAN1 and ISDN3
A network connection device 5a, which is also called a network converter NWC, is connected to and.

The LAN terminal 2a includes an initial setting unit 21a, a partner information registration unit 22a, and a call requesting unit 23a. The initial setting unit 21a sets the physical address of its own terminal, its own IP address, and the IP address of the network connection device to which its LAN terminal 2a is connected via the LAN1. FIG. 3 shows IP address setting and ISDN number registration according to the first embodiment.

The other party information registration section 22a registers the ISDN number of the other party's ISDN terminal 4a to be communicated with. The call origination requesting unit 23a, in the call origination request message of the LAN communication control procedure (LAN-based communication protocol) between its own terminal 2a and the network connection device 5a, the other party The call request message with the ISDN number added is sent to the network connection device 5a via the LAN 1. The call requesting unit 23a also sends the IP address of its own LAN terminal 2a and the IP address of the network connecting device set by the initial setting unit 21a to the network connecting device 5a.

The network connection device 5a includes an initial setting section 51a and a connection calling section 52a. Initial setting section 51
a sets the IP address of itself and the IP address of the LAN terminal 2a under its control. Connection calling unit 52a
Uses the IP address of its own LAN terminal set by the initial setting unit 51a and the IP address of the LAN terminal 2a under its own control from the call requesting unit 23a.
The P address and the IP address of the network connection device 5a to be used are compared.

The connection call origination unit 52a includes the call origination request unit 23.
When the IP address from a matches the set IP address, the call request message with the ISDN number added is received from the call request unit 23a and the ISDN number is set to I.
Make a call to SDN3.

Next, the operation of the first embodiment having such a configuration will be described with reference to the call control sequence shown in FIG.
Here, as an example, the ISDN number is “5000”. First, the call setup procedure will be described. The initial setting unit 21a in the LAN terminal 2a uses '98.
1.0.2 'is set, and '98 .1.0.1' is set as the IP address of the network connection device 5a. LAN terminal 2a
When the call requesting unit 23a therein makes a call request to the network connecting device 5a by the call request message to which the ISDN number (5000) is added, the network connecting device 5a receives the I
The call request message to which the SDN number (5000) is added is received. The network connection device 5a notifies the LAN terminal 2a that the call request has been accepted.

When the connection calling unit 52a in the network connection device 5a sets a call to the exchange 31 in the ISDN 3 by a call setup message to which the ISDN number (5000) is added, the exchange 31 accepts the call setup. This is notified to the network connection device 5a.

The exchange 31 calls the ISDN terminal 4a corresponding to the ISDN number (5000). During a call, a call message is sent from the ISDN terminal 4a via the exchange 31 to the network connection device 5a.

When the ISDN terminal 4a responds,
A response message is sent from the ISDN terminal 4a via the exchange 31 to the network connection device 5a. Furthermore, L
LAN by sending a response message to the AN terminal 2a
The terminal 2a confirms the response. As a result, the LAN terminal 2 and the ISDN terminal 4a are connected and communication is started.

Next, the release procedure will be described. When the communication is completed, first, the LAN terminal 2a sends a disconnection message to the network connection device 5a. The network connection device 5a notifies the LAN terminal 2a that the disconnection message has been received.

When the network connection device 5a sends the received disconnection message to the ISDN3, the ISDN3 disconnects the communication path. The ISDN terminal 4a sends a release message to the network connection device 5a via the exchange 31. Then, the network connection device 5a sends a release completion message to the ISDN terminal 4a via the exchange 31. This ends the call.

As described above, in the first embodiment, the partner information registration unit 22a of the LAN terminal 2a uses the ISD as the partner information.
Only the N number is registered, and the network connection device 5
a does not need to have an address conversion table, and does not need an address conversion server. Therefore, while the LAN terminal 2a can make a call to the ISDN terminal 4a,
Address management is easy. <Second Embodiment of the Invention> Next, a second embodiment of the present invention will be described. FIG. 5 is a configuration diagram showing a network connection system according to the second embodiment of the present invention. In FIG. 5, LA
LAN terminal 2b is connected to N1 and I is connected to ISDN3.
The SDN terminal 4b and the network connection device 5c are connected.

A LAN terminal 2c and a LAN terminal 2d are connected to the network connection device 5c. LAN1 and IS
A network connection device 5b is connected to the DN3.

The LAN terminal 2b includes an initial setting unit 21b, a partner information registration unit 22b, and a call requesting unit 23b. The initial setting unit 21b sets the physical address of its own terminal 2b, its own IP address, and the IP address of the network connection device 5b. In FIG. 6, the partner of the second embodiment is LA
The setting and registration of the IP address and the ISDN conversion in the case of the N terminals 2c and 2d are shown. Embodiment 2 in FIG.
Shows the setting and registration of the IP address and the ISDN conversion when the other party is the ISDN terminal 4b.

The other party information registration unit 22b receives the IDN of the other party's ISDN terminal 4b or LAN terminal 2c, 2d to be communicated.
Register the P address. The call requesting unit 23b, in the call request message of the LAN communication control procedure between its own terminal and the network connection device 5b, is the ISDN terminal 4b or LAN terminal 2c of the other party registered in the other party information registering unit 22b. , 2d and the call request message to which the IP address is added is sent to the network connection device 5b. In addition, the call requesting unit 23b determines the I of the LAN terminal 2b of its own set by the initial setting unit 21b.
The P address and the IP address of the network connection device 5b are sent to the network connection device 5b.

The network connection device 5b includes an initial setting section 51b, a connection calling section 52b, a conversion table 53b, and an address conversion section 54b. The initial setting unit 51b sets its own IP address and the IP address of the LAN terminal 2b under its control.

The conversion table 53b, as shown in FIG.
The IP address and the ISDN number are stored in association with each other for each IP address, and are stored in a memory (not shown). The address conversion unit 54b is the network connection device 5
The ISDN number corresponding to the IP address from b is read from the conversion table 53b and output to the connection calling unit 52b.

The connection calling unit 52b uses the IP address of its own set by the initial setting unit 51b and the IP address of the terminal under its own control as the IP address of its own LAN terminal from the call requesting unit 23b. Match with the IP address of the network connection device.

The connection calling section 52b is connected to the calling request section 23.
When the IP address from b matches the set IP address, the call request message with the IP address added is received from the call requesting unit 23b, and the ISDN number from the address converting unit 54b and the IP at that time are received. The address is called to ISDN3.

The network connection device 5c includes an initial setting section 51c and a connection calling section 52c. Initial setting section 51
In c, the IP address of itself and the IP addresses of the LAN terminals 2c and 2d under its control are set. Connection calling unit 5
2c receives the IP address from ISDN3,
The LAN terminals 2c and 2d corresponding to the address are called.

The LAN terminals 2c and 2d set their own IP address and the IP address of the network connection device 5c. Next, the operation of the second embodiment having such a configuration when the partner is a LAN terminal will be described with reference to the call control sequence shown in FIG. In this case, various values are set as shown in FIG.

First, the initial setting section 21 in the LAN terminal 2b.
b sets "98.1.0.2" as its own IP address and "98.1.0.1" as the IP address of the network connection device 5b. Also, the partner information registration unit 22b
Registers "98.8.0.2" as the IP address of the destination LAN terminal 2c to be connected. This state is shown in FIG.

The call request unit 23b of the LAN terminal 2b is L
A call request is issued to the network connection device 5b by a call request message to which the IP address '98 .8.0.2 'of the AN terminal 2c is added. The network connection device 5b notifies the LAN terminal 2b that the call request has been accepted.

The connection calling unit 52b in the network connection device 5b receives the calling request message from the LAN terminal 2b to which the IP address '98 .8.0.2 'of the LAN terminal 2c is added. The address translation unit 54b is the I terminal of the LAN terminal 2c.
Figure 8 shows the ISDN number corresponding to P address '98 .8.0.2 '.
It is read from the conversion table 53b shown in FIG.

Here, the address conversion unit 54b is the ISD.
N number (3000) and IP address of LAN terminal 2c '98 .8.
0.2 'is output to the connection calling unit 52b. Connection calling unit 52
b is an IS by the call setup message including the ISDN number (3000) and the IP address '98 .8.0.2 'of the LAN terminal 2c.
When the call setup is performed for the exchange in the DN 3, the exchange notifies the network connection device 5b that the call setup has been accepted.

The exchange calls the network connection device 5c corresponding to the ISDN number (3000), and the connection calling unit 52c in the network connection device 5c uses the IP of the LAN terminal 2c.
The LAN terminal 2c is called by the address '98 .8.0.2 '. Subsequent response processing and disconnection processing are the same as those in the first embodiment.

Next, the operation of the second embodiment when the partner is an ISDN terminal will be described with reference to the call control sequence shown in FIG. In this case, various values are set as shown in FIG.

In this example, the ISDN of the ISDN terminal 4b is
It is assumed that the number is "5000" and the IP address is "98.6.0.1". First, the initial setting unit 21 in the LAN terminal 2b
b sets "98.1.0.2" as its own IP address and "98.1.0.1" as the IP address of the network connection device 5b. Also, the partner information registration unit 22b
Registers '98 .6.0.1 'as the IP address of the ISDN terminal 4b of the other party to be connected. This state is shown in FIG.

The call requesting unit 23b of the LAN terminal 2b uses the I
A call request is issued to the network connection device 5b by a call request message to which the IP address "98.6.0.1" of the SDN terminal 4b is added. The network connection device 5b notifies the LAN terminal 2b that the call request has been accepted.

The connection calling unit 52b in the network connection device 5b uses the IP address "98.6.0.1" of the ISDN terminal 4b.
The call request message to which is added is received. The address conversion unit 54b uses the IP address of the ISDN terminal 4b '98.
The ISDN number corresponding to 6.0.1 'is read from the conversion table 53b shown in FIG.

Here, the address conversion unit 54b uses the ISD.
The N number (5000) is output to the connection calling unit 52b. When the connection calling unit 52b sets a call to the exchange in the ISDN 3 by a call setup message including the ISDN number (5000), the exchange notifies the network connection device 5b that the call setup has been accepted.

The exchange has an I corresponding to the ISDN number (5000).
Call the SDN terminal 4b. Subsequent response processing and disconnection processing are the same as those in the first embodiment. Thus, in the second embodiment, the partner information registration unit 22 of the LAN terminal 2b registers the IP address as the partner information, and the network connection device 5b has a conversion table. Therefore, L
While making a call from the AN terminal to the ISDN terminal,
No address translation server is required, and address management is easy. <Third Embodiment of the Invention> Next, a third embodiment of the present invention will be described. FIG. 11 shows a configuration diagram of the third embodiment of the network connection system of the present invention.

In the third embodiment, I connected to ISDN3
SDN terminal 4c and multiple LANs connected to LAN1
It is provided with terminals 2e and 2f, and a network connection device 5c for mutually connecting the ISDN 3 and the LAN.

In the third embodiment, from the ISDN terminal 4c to LA
The N terminal 2e, 2f is characterized in that the incoming call. Said I
The SDN terminal 4c has a calling unit 41c that sends out a call setup message including the ISDN number of its own terminal to the ISDN 3. The network connection device 5c uses the ISD.
A call setup message including an ISDN number is received from N3, and LA between the own device and the LAN terminals 2e and 2f.
As the call request message of the N communication control procedure, the I
The LAN terminal 2 sends a call request message including the SDN number.
It has a call request unit 55c for sending to e and 2f.

Next, the operation of the third embodiment will be described with reference to the call control sequence shown in FIG. First, the calling unit 41c in the ISDN terminal 4c is the IS of the own ISDN terminal 4c.
IS the call setup message containing the DN number (eg 1000)
Send to DN3.

The call requesting unit 55c sends ISDN3 to ISD.
LAN between the own device 5c and the LAN terminals 2e and 2f by receiving the call setup message including the N number (1000)
As the call request message of the communication control procedure, the IS
The LAN terminal 2 sends a call request message including the DN number.
e, 2f.

Therefore, the ISDN number (1000) can be called from the ISDN terminal 4c to the LAN terminals 2e and 2f. <Fourth Embodiment of the Invention> Next, a fourth embodiment of the present invention will be described. FIG. 13 shows a configuration diagram of a fourth embodiment of the network connection system of the present invention.

In the fourth embodiment, I connected to ISDN3
SDN terminal 4d and multiple LANs connected to LAN1
It is provided with terminals 2e and 2f, and a network connection device 5d for mutually connecting the ISDN 3 and the LAN 1.

The ISDN terminal 4d has a partner information registration section 42d for registering the ISDN number assigned to the network connection device 5d and the identification number of the LAN terminal for designating the LAN terminal to receive the call.

The ISDN terminal 4d sends a call setting message including the ISDN number assigned to the network connection device 5d to the ISDN 3 to generate a calling section 43d.
And a sending unit 44d for sending to the ISDN 3 the user user information UUI including the identification number of the LAN terminal that specifies the LAN terminal that should receive the call, as the user user information UUI of the ISDN communication control procedure.

The network connection device 5d has the I
The sending unit 44 based on the SDN number via the ISDN3
It has a call requesting unit 55d which inputs the identification number of the LAN terminal from d and makes a call request to the LAN terminal corresponding to the identification number of the LAN terminal.

The network connection device 5d has an initial setting section 51d for setting its own IP address and the IP address of a subordinate terminal. The LAN terminals 2e and 2f also set their own IP address and the IP address of the network connection device 5d to be used.

FIG. 14 shows initial setting and registration of partner information in each terminal and network connection device. Next, a fourth embodiment according to the call control sequence shown in FIG.
Will be described. First, the partner information registration unit 42d registers the ISDN number assigned to the network connection device 5d and the identification number of the LAN terminal that specifies the LAN terminal that should receive the call, and the calling unit 43d in the ISDN terminal 4d causes the network connection device 4d to register. The ISDN3 call setup message containing the ISDN number (eg 3000) assigned to 5d
To send to.

Next, the sending unit 44d sends to the ISDN 3 the user user information UUI including the identification number (eg 01) of the LAN terminal 2e designating the LAN terminal to receive the call as the user user information of the ISDN communication control procedure.

Further, the call request part 55d in the network connection device 5d is based on the ISDN number (3000) and
The identification number (01) of the LAN terminal 2e is input from the sending unit 44d via the DN3. The call request unit 55d issues a call request to all LAN terminals to inquire whether the identification number (01) of the LAN terminal 2e and the identification number of each LAN terminal match.

In response to this call request, the sending unit 44d
Therefore, the LAN terminal 2e having an identification number that matches the identification number (01) of the LAN terminal 2e returns a response. After that, the ISDN terminal 4d makes a call to the designated LAN terminal 2e. The subsequent processing is the same as the processing in the first embodiment.

As described above, according to the fourth embodiment, the IS
The DN terminal 4d only has an ISDN number and an identification number,
The network connection device 5d does not have a translation table and does not need to have an address translation server. Therefore,
Address management is easy. <Fifth Embodiment of the Invention> Next, a fifth embodiment of the present invention will be described. FIG. 16 shows a configuration diagram of the fifth embodiment of the network connection system of the present invention.

In the fifth embodiment, I connected to ISDN3
SDN terminal 4e and multiple LANs connected to LAN1
The terminals 2e and 2f, the network connection device 5e that mutually connects the ISDN 3 and the LAN 1, and the L that is connected to the LAN 1 and should receive the subaddress of the ISDN communication control procedure
An address conversion server 7e for converting the LAN address of the AN terminal is provided. The contents of the address translation server 7e are shown in FIG.

The ISDN terminal 4e has a partner information registration section 42e for registering the ISDN number assigned to the network connection device 5e and the identification number for designating the LAN terminal to receive the call.

The ISDN terminal 4e adds the ISDN number assigned to the network connection device 5e and the identification number designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sends the ISDN 3 to the ISDN 3. Have.

The network connection device 5e is an ISD.
A reading unit 56e that receives a sub address from N3 and reads an IP address corresponding to the sub address from the address translation server 7e, and a call request unit 55 that makes a call request to the LAN terminal corresponding to the read IP address.
with e.

Further, the network connection device 5e is
It has an initial setting unit 51e for setting its own IP address and the IP address of a subordinate terminal. LAN terminals 2e, 2f
The address translation server 7e sets its own IP address and the IP address of the network connection device 5e to be used.

FIG. 17 shows initial setting and registration of partner information in each terminal and network connection device. Next, the operation of the fifth embodiment will be described with reference to the call control sequence shown in FIG. First, the partner information registration unit 42e determines the ISDN number (eg,
3000) and the identification number (01) of the LAN terminal that specifies the LAN terminal 2e that should receive the call, the sending unit 44e identifies the ISDN number (3000) assigned to the network connection device 5e and the LAN terminal 2e that should receive the call. The specified identification number (01) is added to the subaddress of the ISDN communication control procedure and sent to ISDN3.

The network connection device 5e receives the subaddress including the ISDN number (3000) and the identification number (01). The reading unit 56e sends the IP address corresponding to the subaddress from the ISDN 3 to the address translation server 7e.
Read from

Here, according to the table of the address translation server 7e shown in FIG.
It is converted to P address '98 .8.0.2 '. Call request part 5
5e makes a call request to the LAN terminal 2e corresponding to the read IP address '98 .8.0.2 '. As a result, IS
The DN terminal 4e makes a call to the designated LAN terminal 2e.

As described above, in the fourth embodiment, ISDN is used.
The partner information registration unit 22e of the terminal 4e uses IS as the partner information.
It has a DN number and an identification number. Also, since only the address translation server 7e is provided, the ISDN terminal
It is possible to make a call to the AN terminal, the network connection device does not need a conversion table, and address management is simple. <Sixth Embodiment of the Invention> Next, a sixth embodiment of the present invention will be described. FIG. 20 shows a configuration diagram of the sixth embodiment of the network connection system of the present invention.

In the sixth embodiment, I connected to ISDN3
SDN terminal 4f and multiple LANs connected to LAN1
The terminals 2e and 2f, the network connection device 5f that mutually connects the ISDN 3 and the LAN 1, and the L that is connected to the LAN 1 and should receive the subaddress of the ISDN communication control procedure
An address conversion server 7f for converting the LAN address of the AN terminal is provided. The contents of the address translation server 7f are shown in FIG.

The ISDN terminal 4f has a partner information registration section 42f for registering the ISDN number assigned to the network connection device 5f and the LAN terminal identification number designating the LAN terminal to receive the call.

The ISDN terminal 4f sends a call setup message including a ISDN number assigned to the network connection device 5f to the ISDN 3 to generate a calling section 43f.
And a sending unit 44f for sending to the ISDN 3 the user user information UUI including the identification number of the LAN terminal that specifies the LAN terminal that should receive the call, as the user user information UUI of the ISDN communication control procedure.

The network connection device 5f has an initial setting section 51f for setting its own IP address and the IP address of a subordinate terminal. The network connection device 5
The f includes a reading unit 56f that receives user user information including the identification number of the LAN terminal from the ISDN 3 and reads the IP address corresponding to the identification number of the LAN terminal from the address conversion server 7f. The call request unit 55f is
A call request is issued to the LAN terminal corresponding to the IP address read by the reading unit 56f. LAN terminal 2
e, 2f and the address translation server 7f also set their own IP address and the IP address of the network connection device 5f to be used.

FIG. 21 shows initial setting and registration of partner information in each terminal and network connection device. Next, a sixth embodiment according to the call control sequence shown in FIG.
Will be described. First, the partner information registration unit 42f registers the ISDN number (for example, 3000) assigned to the network connection device 5f and the LAN terminal identification number (01) that designates the LAN terminal 2e that should receive the call.

The calling unit 43f is the network connection device 5f.
Call ISDN3 with the ISDN number (3000) assigned to. Furthermore, the sending unit 44f uses the LAN that should receive the incoming call.
The user user information UUI including the identification number (01) designating the terminal 2e is sent to the ISDN 3.

The network connection device 5f receives the ISDN number (3000) and the user user information UUI including the identification number (01). The reading unit 56f is I
The IP address corresponding to the identification number (01) from SDN3 is read from the address conversion server 7f.

Here, the identification number (01) is converted into the IP address '98 .8.0.2 'by the table of the address conversion server 7f shown in FIG. The call request unit 55f makes a call request to the LAN terminal 2e corresponding to the read IP address '98 .8.0.2 '. As a result, the ISDN terminal 4
A call is made from e to the designated LAN terminal 2e.

As described above, in the fifth embodiment, ISDN is used.
The partner information registration unit 22f of the terminal 4f uses IS as the partner information.
It has a DN number and an identification number. Further, since only the address translation server 7f is provided, the ISDN terminal can
It is possible to make a call to the AN terminal, the network connection device does not need a conversion table, and address management is simple.

[0095]

According to the present invention, the calling request unit is an ISDN.
The terminal designating information designating the terminal is sent to the network connection device, and the connection calling unit receives the terminal designating information and calls the ISDN for the terminal designating information. As a result, the LAN terminal can easily make a call to the designated ISDN terminal, and since it does not have an address conversion table, address management is unnecessary.

Further, the call request unit sends out the LAN address corresponding to the ISDN identification information of the ISDN terminal of the other party, and the address conversion unit outputs the ISD corresponding to the LAN address.
The N identification information is read from the conversion table, and the connection calling unit calls the ISDN identification information from the address conversion unit to ISDN. Therefore, a call can be made from the LAN terminal to the ISDN terminal, and an address conversion server or the like is not required, and address management is easy.

When the calling section sends the ISDN identification information of its own terminal to the ISDN, the call request section receives the ISDN identification information from the ISDN and sends the call request message including the ISDN identification information to the LAN terminal. IS
The DN identification information is called to all LAN terminals.

Further, the calling unit sends the ISDN identification information assigned to the network connection device to the ISDN, and the sending unit sends the user user information including the LAN terminal designating information designating the LAN terminal to receive the call to the ISDN. . The call request unit makes a call request to the LAN terminal corresponding to the LAN terminal designation information from the sending unit. As a result, ISDN
The terminal makes a call to the designated LAN terminal, and the ISDN terminal only has the ISDN identification information and the LAN terminal designation information.
The network connection device does not have a conversion table, and
Address management is easy because there is no need to provide an address translation server.

When the reading unit receives the user user information including the LAN identification information from the ISDN and reads the LAN address corresponding to the LAN identification information from the address conversion unit, the call request unit corresponds to the read LAN address. A call request is made to the LAN terminal. As a result, I
A call is made from the SDN terminal to the specified LAN terminal, and ISDN
The terminal only has the ISDN identification information and the LAN terminal designation information, and the network connection device does not have the conversion table.
Address management is easy.

When the sending unit adds the ISDN identification information assigned to the network connection device and the identification information designating the LAN terminal to be received to the subaddress of the ISDN communication control procedure and sends the ISDN to the ISDN, the reading unit reads the ISDN. The LAN address corresponding to the sub-address from is read from the address conversion unit. The call request unit makes a call request to the LAN terminal corresponding to the read LAN address. As a result, the ISDN terminal calls the designated LAN terminal, and the ISDN terminal receives the ISDN identification information and LA.
Only the N terminal designation information is provided, the network connection device does not have the conversion table, and the address management is easy.

[Brief description of drawings]

FIG. 1 is a principle diagram showing a network connection system of the present invention.

FIG. 2 is a configuration diagram showing a first embodiment of a network connection system of the present invention.

FIG. 3 is a diagram showing setting of an IP address and registration of an ISDN number according to the first embodiment.

FIG. 4 is a diagram showing a call control sequence in the first embodiment.

FIG. 5 is a configuration diagram showing a second embodiment of the network connection system of the present invention.

FIG. 6 is a diagram showing IP address setting / registration and ISDN number conversion when the destination is a LAN terminal according to the second embodiment.

FIG. 7 is a diagram showing IP address setting and registration and ISDN number conversion when the other party is an ISDN terminal according to the second embodiment.

FIG. 8 is a diagram showing the contents of a conversion table according to the second embodiment.

FIG. 9 is a diagram showing a call control sequence when the destination is a LAN terminal according to the second embodiment.

FIG. 10 is a diagram showing a call control sequence when the other party of the second embodiment is an ISDN terminal.

FIG. 11 is a configuration diagram showing a third embodiment of the network connection system of the present invention.

FIG. 12 is a diagram showing a call control sequence in the third embodiment.

FIG. 13 is a configuration diagram showing a fourth embodiment of the network connection system of the present invention.

FIG. 14 is a diagram showing setting of an IP address and registration of an ISDN number according to the fourth embodiment.

FIG. 15 is a diagram showing a call control sequence in the fourth embodiment.

FIG. 16 is a configuration diagram showing a fifth embodiment of the network connection system of the present invention.

FIG. 17 is a diagram showing IP address setting, ISDN number registration, and IP address conversion according to the fifth embodiment.

FIG. 18 is a diagram showing the contents of a conversion table according to the fifth embodiment.

FIG. 19 is a diagram showing a call control sequence in the fifth embodiment.

FIG. 20 is a configuration diagram showing a sixth embodiment of the network connection system of the present invention.

FIG. 21 is a diagram showing IP address setting, ISDN number registration, and IP address conversion according to the sixth embodiment.

FIG. 22 is a diagram showing the contents of a conversion table according to the sixth embodiment.

FIG. 23 is a diagram showing a call control sequence in the sixth embodiment.

[Explanation of Codes] 1 .. LAN 2a to 2f .. LAN terminal 3 .. ISDN 4a to 4f .. ISDN terminal 5a to 5f .. Network connection device 7e, 7f .. Address translation server 21a, 21b .. Initial setting Part 22a, 22b .. Partner information registration unit 23a, 23b .. Request calling unit 31 .. Switch 41c .. Calling unit 42d to 42f .. Partner information registration unit 43d, 43f .. Calling unit 44d to 44f. -Sending section 51a to 51d, 51f-Initial setting section 52a, 52b, 52c-Connection calling section 53b-Conversion table 54b-Address conversion section 55c-55f-Call request section 56e, 56f-Read section

Claims (10)

[Claims] 1. A plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. And a network connection device to be connected, wherein each LAN terminal, as a call request message of a LAN communication control procedure between its own terminal and the network connection device, a call request including terminal designation information for designating an ISDN terminal. A call requesting unit for sending a message to the network connection device, wherein the network connection device receives the call request message to which the terminal designation information is added from the call request unit and calls the terminal designation information to the ISDN. A network connection system characterized by having a connection calling unit for connecting. 2. The network connection system according to claim 1, wherein the terminal designation information included in the call request message sent by the call request unit is ISDN identification information. 3. The terminal designation information included in the call request message sent by the call request unit is a LAN address corresponding to the ISDN identification information of the ISDN terminal of the other party, and the network connection device is the LAN. Address I
The connection calling unit includes a conversion table for converting into SDN identification information and an address conversion unit for reading out ISDN identification information corresponding to the LAN address from the call request unit from the conversion table. ISDN
The network connection system according to claim 2, wherein the identification information is called to ISDN. 4. A plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. A network connection device for connection, each of the ISDN terminals has a calling unit for sending out a call setup message including ISDN identification information of its own terminal to the ISDN, and the network connection device comprises:
A call request unit that receives a call setup message including N identification information and sends a call request message including the ISDN identification information to the LAN terminal as a call request message of the LAN communication control procedure between the own device and the LAN terminal. A network connection system having. 5. A plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. A network connection device for connection, wherein each of the ISDN terminals sends a call setup message including a ISDN identification information assigned to the network connection device to the ISDN, and as a user user information of ISDN communication control procedure. , User user information including LAN terminal designation information for designating a LAN terminal to receive an incoming call
A transmission unit for transmitting to the SDN, wherein the network connection device inputs LAN terminal designation information from the transmission unit via the ISDN based on the ISDN identification information, and a LAN corresponding to the LAN terminal designation information.
A network connection system having a call request unit for making a call request to a terminal. 6. The network connection system according to claim 5, wherein the LAN terminal designation information included in the user information sent by the sending unit is LAN identification information. 7. The call request unit inquires of each LAN terminal as to whether or not the LAN identification information from the transmission unit matches the LAN identification information of each LAN terminal. Network connection system. 8. The LAN of a LAN terminal to receive an incoming call
The network connection device receives the user user information including the LAN identification information from the ISDN, and outputs the LAN address corresponding to the LAN identification information. The read request unit reads from the address conversion unit, and the call request unit reads the L read by the read unit.
7. The network connection system according to claim 6, wherein a call request is made to a LAN terminal corresponding to the AN address. 9. A plurality of ISDN terminals connected to an ISDN, a plurality of LAN terminals connected to a LAN, and an ISDN and a LAN for mutual communication between each ISDN terminal and each LAN terminal. The network connection device to connect to and the LA that should receive the subaddress of the ISDN communication control procedure
An address translation unit that translates into a LAN address of the N terminal, wherein each ISDN terminal has ISDN identification information assigned to the network connection device and identification information designating a LAN terminal to be received, in the ISDN communication control procedure. The network connection device has a sending unit that adds the subaddress to the ISDN, and sends the ISDN to the network connection device. The reading unit reads the LAN address corresponding to the subaddress from the address converting unit And a call request section for making a call request to a LAN terminal corresponding to the above. 10. An IS to which a plurality of ISDN terminals are connected
A network connection device interconnecting a DN and a LAN to which a plurality of LAN terminals are connected, wherein the IS is used as a call request message of a LAN communication control procedure between the LAN terminal and the network connection device.
A network connection device comprising a connection calling unit for calling the terminal designation information to the ISDN when a call request message including terminal designation information for designating a DN terminal is transmitted from the LAN terminal.