JPH07212494A - Lan call termination method from telephone - Google Patents

Abstract

PURPOSE:To provide a technique for terminating a call from a telephone to a terminal equipment provided with a voice communication function connected to a LAN. CONSTITUTION:An exchange 105 is provided with an extension telephone number correspondence table for making the telephone numbers of the terminal equipments 101-103 and the telephone number of a connection controller 104 correspond to each other, acquires the telephone numbers of the terminal equipments 101-103 from the telephone 107, then, connects with the connection controller 104 corresponding to the terminal equipment based on the extension telephone number correspondence table and then, transmits the telephone numbers of the terminal equipments 101-103 to the connection controller 104. The connection controller 104 is provided with a LAN address conversion table for making the telephone numbers of the terminal equipments 101-103 and the LAN addresses of the terminal equipments be in one-to-one or oneto-(n) correspondence and connects with the terminal equipments 101-103 after LAN address conversion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting a public network and a LAN, and particularly to a telephone connected to the public network for LA.
The present invention relates to a LAN incoming call method from a telephone applied when an incoming call is made to a computer having a voice call function connected to N.

[0002]

2. Description of the Related Art In Japanese Laid-Open Patent Publication No. 5-3514, a correspondence between an employee number and an extension number of a transfer destination is registered in a transfer table, and when an incoming call is received, voice guidance prompting the employee to input the employee number is transmitted. The invention relates to an apparatus for automatically obtaining an extension number corresponding to an employee number obtained as a response based on a forwarding table and automatically forwarding an incoming call to the extension telephone.

In Japanese Patent Laid-Open No. 4-252547, registration is performed by associating ISDN terminal identification numbers such as dial-in numbers of ISDN terminals connected to one line of an ISDN network with whether or not to answer each incoming call. And then, based on this,
The present invention relates to a method of responding to an ISDN terminal identification number received when an incoming call arrives.

[0004]

The above-mentioned two conventional techniques relate to an incoming call to an extension telephone or a terminal directly connected to a private branch exchange (hereinafter referred to as an exchange). Therefore, when the exchange receives a call from a telephone connected to the public network to a terminal having a voice call function (hereinafter referred to as a LAN terminal) connected to the LAN in a system connected to the LAN, the telephone is used as a communication partner. There is a problem in that only the connection control device for connecting to can be specified, and the terminal connected to the LAN cannot be specified.

An object of the present invention is to provide a technique for receiving an incoming call from a telephone to a LAN terminal.

[0006]

To achieve the above object, the present invention provides a connection control device for controlling connection between an exchange and a LAN terminal between the exchange and a LAN, and the exchange has an LA controller.
Means for creating a correspondence table of telephone numbers of N terminals and connection control devices, means for creating a correspondence table of LAN terminal telephone numbers and LAN addresses in the connection control device,
The exchange is provided with means for notifying the connection control device of the telephone number of the LAN terminal.

[0007]

When the telephone call arrives at the LAN terminal from the telephone, the exchange connects to the connection control device corresponding to the telephone number of the LAN terminal by the correspondence table of the telephone number of the LAN terminal and the telephone number of the connection control device. Also, after connecting to the connection control device, the telephone number of the LAN terminal is transmitted. The connection control device converts the telephone number of the LAN terminal transmitted from the exchange into a LAN address based on the correspondence table of the telephone number of the LAN terminal and the LAN address, and by connecting to the LAN terminal, the telephone is connected to the LAN terminal. It will be possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows the configuration of the present invention. 101-
Reference numeral 103 denotes a LAN terminal having computer capabilities, and the LAN terminals 101 to 103 are connected by a LAN line 108. In the present invention, the exchange 105 and the LAN
A connection control device 104 for controlling the connection of the terminals 101 to 103 is provided. The connection control device 104 is a control device having computer capabilities, and is connected to each of the LAN terminals 101 to 103 by a LAN line 108 and is connected to the exchange 105 by an extension telephone line 109. The exchange 105 is an exchange in which the capability of a computer is added to the existing exchange, and the connection control device 10 is connected by an extension telephone line 109.
4 and is connected to the public network 10 by an external telephone line 110.
Connected to 6. The public network 106 is connected to the telephone 107.

In this embodiment, the telephone 107 is the LAN line 10.
8 is related to the case of making a call to one of the LAN terminals 101 to 103 connected to the switch 8.
Connect to the connection control device 104 and identify the LAN terminal to which the connection control device 104 connects.
It is intended to realize a voice call between the telephone 107 and the LAN terminals 101 to 103 by connecting to the telephone 103.

Next, the hardware configuration of the system will be described with reference to FIGS. 2, 3 and 4.

First, the hardware configuration of the LAN terminals 101 to 103 will be described with reference to FIG. LAN terminals 101-103
Is a CPU 201 for executing the functions of the present invention and operating various software, a memory 202 for storing programs and data, a handset 206 for inputting and outputting voice, a voice control interface 203 for digitizing and analogizing voice, LAN communication control interface 205, voice control interface 203 or LAN for transmitting / receiving data through the LAN line 108
DMAC (direct memory access controll) that transfers data between the communication control interface 205 and the memory 202
er) 204.

The voice input from the handset is digitized by the voice control interface 203 and transmitted to the LAN line 108 by the LAN communication control interface 205. In addition, the LAN communication control interface 20
The digitized voice received from the mobile phone 5 is converted into analog by the voice control interface 203 and output from the handset 206. The CPU 201 handles connection and disconnection between LAN terminals and between LAN terminals and telephones.

Next, the hardware configuration of the connection control device 104 will be described with reference to FIG. The connection control unit 104 executes CPU 301 for executing the functions of the present invention, a memory 302 for storing programs and data, and a correspondence table of LAN terminal telephone numbers and LAN addresses, and extension telephone line communication control for transmitting and receiving data through the extension telephone line 109. The interface 303 includes a LAN communication control interface 305 that transmits and receives data through the LAN line 108, and each communication control interface 303 or 305, and a DMAC 304 that transfers data between the memories 302.

The analog voice received from the extension telephone line 109 is digitized by the extension telephone line communication control interface 303 and is stored in the memory 302 by the DMAC 304.
Transferred to. The transferred data is DMAC30.
4 is transferred to the LAN communication control interface 305 and transmitted to the LAN line 108. In addition, the digitized voice received from the LAN line 108 is DMA
The data is transferred from the LAN communication control interface 305 to the memory 302 by C304. The transferred data is D
Transferred to the extension telephone line communication control interface 303 by the MAC 304, converted into analog by the extension telephone line communication control interface 303, and the extension telephone line 1
09 is transmitted. The CPU 301 handles connection and disconnection between the exchange and the LAN terminal.

Next, the hardware configuration of the exchange 105 will be described with reference to FIG. The exchange 105 includes a CPU 401 that executes the functions of the present invention, a program, data, and a LAN.
A memory 402 for storing a correspondence table between a telephone number of a terminal and a telephone number of the connection control device 104, an extension telephone line 109
An extension telephone line communication control interface 403 that transmits and receives data through the outside telephone line communication control interface 40 that transmits and receives data through the outside telephone line 110.
5 and extension telephone line communication control interface 403
Alternatively, it is composed of an external telephone line communication control interface 405 and a DMAC 404 for transferring data between the memory 402.

The analog voice received from the outside line telephone line 110 is digitized by the outside line telephone line communication control interface 405 and is stored in the memory 402 by the DMAC 404.
Transferred to. The transferred data is transferred to the extension telephone line communication control interface 403 by the DMAC 404, converted into an analog signal by the extension telephone line communication control interface 403, and transmitted to the extension telephone line 109. Further, the analog voice received from the extension telephone line 109 is digitized by the extension telephone line communication control interface 403 and is stored in the memory 4 by the DMAC 404.
02. The transferred data is DMAC40
External telephone line communication control interface 405 by 4
External telephone line communication control interface 40
5 is converted into an analog signal and transmitted to the outside line telephone line 110. CPU4 for connection and disconnection between telephone and connection control device
01 processes.

FIG. 5 shows a connection sequence for connecting a telephone to a LAN terminal. This sequence is for telephone 10
7 connects to the LAN terminal 101 to make a call 508, and the telephone 107 uses a dial-in service and
It is assumed that the telephone number indicating the AN terminal 101 or the extension telephone is dialed.

In this case, the exchange 105 receives the telephone number 502 of the LAN terminal 101 after the connection request 501 from the telephone 107 to the LAN terminal 101. Switch 105
After receiving the telephone number 502 of the LAN terminal 101,
Connection request 503 to the connection control device 104 and the LAN terminal 10
1 telephone number 502 is transmitted. Connection control device 104
Receives the telephone number 502 of the LAN terminal 101,
After converting the telephone number 502 of the LAN terminal 101 into a LAN address, a connection request 504 is transmitted to the LAN terminal 101. Upon receiving the connection request 504, the LAN terminal 101 sends a response 505 to the connection control device 104. Upon receiving the response 505 from the LAN terminal 101, the connection control device 104 identifies that the response 505 is an affirmative response, and transmits the response 506 to the exchange 105. Exchange 10
When receiving the response 506 from the connection control device 104, the device 5 transmits the response 507 to the telephone 107. By the above procedure, a call 508 between the telephone 107 and the LAN terminal 101 is made.
Will be realized.

FIG. 6 is a processing flow of the exchange 105, and FIG. 9 shows an extension telephone number correspondence table 900. The extension telephone number correspondence table 900 sets the telephone number of the connection control device 104 for a LAN terminal and the extension number for an extension telephone. The exchange 105 is a telephone 107
After receiving the connection request 501 from (step 601), the telephone number 502 is received (step 602). Regarding the reception of the telephone number 502, it is assumed in the present embodiment that the telephone can use the dial-in service, but the operator does not send the LAN terminal telephone number from the telephone but the operator makes a telephone call from the caller who is the telephone user. There is also a method of listening to the number and manually inputting it by the exchange 105.

The exchange 105 finds an item corresponding to the received telephone number 502 among the telephone numbers set in the extension telephone number correspondence table 900, and acquires the connection destination extension telephone number 902 corresponding thereto ( Step 60
3). Next, the connection control device 104 or the extension telephone having the acquired connection destination telephone number 902 is connected (step 60).
4). The telephone number 901 and the extension telephone number 902 of the connection destination are compared (step 605). If they do not match, the connection destination becomes the connection control device and the telephone number 502 is transmitted (step 606). If they match, the connection destination is an extension telephone, so nothing is transmitted. Next, when the exchange 105 receives the response 506 from the connection control device 104 (step 607), it transmits the response 507 to the telephone (step 608). After this, a call is made (step 609).

In the present invention, since the LAN terminal is connected,
The connection control device 104 is provided, and the exchange 105 is provided with an extension telephone correspondence table 900. By using this table, it is possible to identify whether the connection destination is the connection control device 104 or the extension telephone, and in the case of the connection control device 104, the connection processing with the LAN terminal of connecting after transmitting the telephone number of the LAN terminal. In the case of an extension telephone, the process of simply connecting can be performed. In this way, even if the extension telephone and the connection control device 104 are simultaneously connected to the exchange 105, connection control corresponding to each of them can be performed. Further, in the present invention, the connection destination is identified as the connection control device 104 by comparing the telephone number 901 and the connection destination telephone number 902, but the connection destination is the connection control device 1 in the correspondence table.
A method of identifying by adding a designation bit designating that the number is 04 may be used.

FIG. 7 is a processing flow of the connection control device 104, and FIG. 10 is a LAN address conversion table 1000, in which telephone numbers of LAN terminals and LAN addresses are set in association with each other. After receiving the connection 503 from the exchange 105 (step 701), the connection control device 104 checks whether the LAN terminal to be connected is fixed (step 702), and if not fixed, receives the telephone number 502 (step 70).
3). Steps 702 and 7014 are steps for implementing the second embodiment, which will be described in the second embodiment. LAN address conversion table 100
The item 1001 that matches the telephone number 502 is found from 0, and the corresponding LAN address 1002 is acquired (step 704). A connection request 504 is created and sent to the LAN terminal indicated by the LAN address 1002 (step 7).
05). It is determined whether the search of the LAN address conversion table 1000 is completed (step 706).

If the search is not completed, the process returns to step 704. If it is completed, the response 505 from the LAN terminal is received (step 707), and it is determined whether the response 505 is a positive response (step 708). If it is a positive response, the response 506 is transmitted to the exchange 105 (step 70).
9) The call is started (step 710). If it is not an affirmative response, it is determined whether it is a negative response (step 7
11) If it is a negative response, the response 506 is transmitted to the exchange 105 (step 712), and a voice guide of unconnectable is sent to the telephone 107 (step 713).

When the telephone number 502 and the LAN address are associated with 1: n in the LAN address conversion table, there are a plurality of items 1001 that match the telephone number 502. In this case, the connection request 504 is transmitted to all the LAN terminals corresponding to it. Further, the negative response includes busy, call rejection, and timeout, and the voice guide that cannot be connected is selected according to the type of negative response. Also, by playing this voice guide, the caller can be informed of the disconnection and can disconnect.

The LAN address conversion table 1000 is
A new entry can be registered and changed by transmitting a message including the telephone number and LAN address of the LAN terminal from the LAN terminal. Also, by registering the telephone number and LAN address of the LAN terminal to 1: n, when an incoming call arrives, a plurality of LAN terminals are simultaneously called.
This is effective in such a case because the LAN terminal user can specify to call the destination terminal even when the user moves.

FIG. 8 shows a processing flow of each LAN terminal 101-103. Upon receiving the connection request 504 from the connection control device 104 (step 801), each of the LAN terminals 101 to 103 sounds a ringing tone (step 802),
The incoming call is displayed (step 803). Next, the input from the LAN terminal user is received (step 804) and the response 50 is sent.
Make 5 an affirmative or negative response. That is, it is determined whether the input from the LAN terminal user is connection acceptance or connection refusal (step 805), and if connection is accepted, an affirmative response 505 is transmitted (step 806) and a call is made (step 807). If the connection is rejected, a negative response 505 is transmitted (step 808). Also, after calling for a certain time L
If no input is made from the AN terminal user, a timeout occurs and a negative response 505 is transmitted in step 808.

Next, a second embodiment will be described. In the first embodiment, when the exchange 105 is connected to the connection control device 104, it is necessary to add a function of transmitting the telephone numbers of the LAN terminals 101 to 103 to the connection control device 104. In this embodiment, the LAN terminals 101 to 103 in the exchange 105 are
The telephone 107 can be connected to the LAN terminals 101 to 103 without adding the function of transmitting the telephone number of the above to the connection control device 104. Therefore, in the connection control device 104, one LAN address of the LAN terminal to be connected when an incoming call arrives, for example, the LAN address of the LAN terminal 101 is registered, and the LAN terminal 101 connected at this time is connected to another LAN terminal 102. -10. Allows specification of changing the connection destination. The system configuration of the present embodiment is the exchange 10
This is the same as the first embodiment except that 5 is an existing exchange.

Next, the outline of the operation will be described. FIG. 7 shows a flow of the connection control device 104. Consider a case where a call is made from the telephone 107 to the LAN terminal 102. First, L of the LAN terminal 101 to be connected to the connection control device 104 when an incoming call arrives.
When an incoming call arrives by registering the AN address, the connection control device 104 determines that the LAN terminal device to be connected is fixed (step 702), and the registered L
The LAN terminal 101 having the AN address is connected (step 714). LAN terminal 1 connected to the connection control device 104
01 user talks with telephone 107 user, which LAN
The connection control device 1 asks whether to connect to the terminal and uses the LAN address of the LAN terminal 102 to be connected as a transfer message.
04, and ends the connection with the connection control device 104.

The connection control device 104 is the LAN terminal 101.
From the message (step 707), if the message is a transfer message, the connection control device obtains the LAN address from the message (step 715),
A connection is made with the LAN terminal 102 indicated by the LAN address (step 716).

The effect of this embodiment is that the LAN terminals 101 to 103 can be called by the same operation as that of making a call from the telephone 107 to an extension telephone as in the first embodiment. Compared to the example, after the exchange 105 is connected to the connection control device 104, the telephone 107 is connected to the LAN terminals 101 to 103 without adding a function of transmitting the telephone numbers of the LAN terminals 101 to 103 to the connection control device 104.
Can be connected to.

Next, a third embodiment will be described. FIG. 11 shows
It is a system block diagram of a present Example. In the first embodiment,
Since there is only one telephone line between the connection control device 1104 and the exchange 1105, it is not possible to make a telephone call between another LAN terminal and the telephone when it is in use. This becomes a problem when the number of LAN terminals increases and the number of incoming calls to the LAN terminals also increases.
In order to solve this, the telephone line 1101 to
1103 corresponds to each of the LAN terminals 101 to 103 1: 1. 101 to 103 are the same LA as in the first embodiment
It is N terminal. 1104 is connected to the exchange 1105 by telephone lines 1101 to 1103. 1105 is an existing exchange. The telephone lines 1101 to 1103 correspond to the LAN terminals 101 to 103. The other configuration is the same as that of the first embodiment.

Next, an outline of the operation of this embodiment will be described. Consider a case where an incoming call is received from the telephone 107 to the LAN terminal 101. The exchange 1105 is a LAN in the same manner as in the first embodiment.
The telephone number of the terminal 101 is acquired. Exchange 1105
The connection control device 1104 is connected through the telephone line 1101 corresponding to the acquired telephone number. The connection control device 1104
By being connected through the telephone line 1101, it is known that the LAN terminal to be connected is 101, and the LAN terminal 10
1 is called, and a call is realized between the telephone 107 and the LAN terminal 101.

The effect of the present embodiment is that the LAN terminals 101 to 103 can be called by the same operation as the call from the telephone 107 to the extension telephone as in the second embodiment, and the number of LAN terminals is further increased. However, there is an advantage that you can always connect when receiving a call.

Next, a fourth embodiment will be described. Figure 12
It is a system block diagram of a present Example. In the third embodiment,
The number of lines increases as the number of LAN terminals increases. For this reason,
In this embodiment, the connection control device 1204 and the exchange 1205
A time division multiplexer 1206 is provided in the. The time-division multiplexing device 1206 is a device that time-division-multiplexes the extension telephone line 1201 by deciding a time corresponding to a LAN terminal that transmits data.

FIG. 13 is a diagram showing time division multiplexing corresponding to the LAN terminals 101 to 103.

Reference numerals 1301-1303 denote LAN terminals 1 respectively.
The data corresponds to 01 to 103, and is hereinafter referred to as a time slot. In the present embodiment, the lines corresponding to the LAN terminals are time-division multiplexed, so that the number of LAN terminals is one, but the number of telephone lines is one. The other structure is the same as that of the second embodiment.

Next, the operation outline will be described. Consider a case where a call is made from the telephone 107 to the LAN terminal 101. The exchange 1205 uses the same method as in the first embodiment for the LAN terminal 10.
Get the phone number of 1. The exchange 1205 connects with the connection control device 1204 in a time slot 1301 corresponding to the acquired telephone number. The connection control device 1204 learns that the connected LAN terminal is 101 by being connected in the time slot 1301, and the LAN terminal 1
01 is called, and a call is realized between the telephone 107 and the LAN terminal 101.

The effect of the present embodiment is that the LAN terminals 101 to 103 can be called by the same operation as the call from the telephone 107 to the extension telephone as in the third embodiment, but the number of LAN terminals is increased. However, there is an advantage that the number of telephone lines between the exchange and the connection control device can be small.

Next, a fifth embodiment will be described. The purpose of this embodiment is to enable incoming calls even if the number of LAN terminals increases and the number of incoming calls to the LAN terminals increases, as in the third and fourth embodiments. FIG. 14 shows the system configuration of this embodiment. FIG. 15 shows an alternative connection control device number correspondence table 15
00.

Alternate connection control device number correspondence table 150
0 sets the telephone number of the connection control device to be connected when the connection control device is in use, corresponding to the telephone number of the connection control device. In this embodiment, a plurality of connection control devices 1401, 1
402, the alternative connection control device number correspondence table 15
00 is provided in the exchange 105. The other configuration is the same as that of the first embodiment.

Next, the outline of the operation of this embodiment will be described. Consider a case where a call is made from the telephone 107 to the LAN terminal 101. The exchange 105 receives the telephone number from the telephone as in the first embodiment, and acquires the telephone number of the connection control device 1401 from the extension telephone number correspondence table 900. At this time, if the connection control device 1401 is in use, the exchange 105 selects the alternative connection control device number correspondence table 1500.
For the telephone number 1502 of the connection control device 1402 to be connected instead. Thereafter, the exchange 105 transmits a connection request 503 to the connection control device 1402 by the same method as in the first embodiment, and the connection control device 1402 connects to the LAN terminal 101. As a result, the connection control device 140
1 using the connection control device 1402 even when 1 is in use
A call between 07 and the LAN terminal 101 is realized.

In the present embodiment, the connection control device can be easily added by simply registering the telephone number of the connection control device to be added in the alternative connection control device number correspondence table 1500, the number of LAN terminals is increased, and LAN is increased. Allow incoming calls even if the number of incoming calls to the terminal increases.

[0043]

According to the present invention, (1) a call can be made to a LAN terminal having a voice call function for connecting to a LAN by the same operation as when making a call to an extension telephone. (2) L
By associating the telephone number of the AN terminal and the LAN address with 1: n, the terminal user can obtain an effect such as being able to receive a call at the destination even when moving between terminals.

[Brief description of drawings]

FIG. 1 is a block diagram of a system.

FIG. 2 is a block diagram of hardware of a LAN terminal.

FIG. 3 is a block diagram of hardware of a connection control device.

FIG. 4 is a block diagram of hardware of an exchange.

FIG. 5 is an explanatory diagram of a connection sequence for connecting a telephone to a LAN terminal.

FIG. 6 is a processing flowchart of the exchange.

FIG. 7 is a processing flowchart of the connection control device.

FIG. 8 is a processing flowchart of a LAN terminal.

FIG. 9 is an explanatory diagram of an extension telephone number correspondence table.

FIG. 10 is an explanatory diagram of a LAN address conversion table.

FIG. 11 is a block diagram of a system when a LAN terminal and an extension telephone line correspond to each other 1: 1.

FIG. 12 is a block diagram of a system when a LAN terminal and time slots correspond to each other 1: 1.

FIG. 13 is an explanatory diagram showing time slots transmitted / received for a LAN terminal.

FIG. 14 is a block diagram of a system when a plurality of connection control devices are connected.

FIG. 15 is an explanatory diagram of an alternative connection control device correspondence table.

[Description of Reference Signs] 101, 102, 103 ... LAN terminal, 104 ... Connection control device, 105 ... Switch, 106 ... Public network, 107 ... Existing telephone, 108 ... LAN line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Morita 5-22-1 Kamimizumotocho, Kodaira-shi, Tokyo Inside Hitachi Microcomputer System Co., Ltd. Hitachi, Ltd. System Development Laboratory (72) Inventor Susumu Matsui 1099, Ozenji, Aso-ku, Kawasaki City, Kanagawa Prefecture Hitachi System Development Laboratory

Claims (5)

[Claims] 1. A LAN for connecting at least one terminal device having a voice call function, a public network for connecting a telephone, an exchange connected to the public network, and a connection between the exchange and the LAN. In the network system including the connection control device for controlling, the exchange is (1) a correspondence table of telephone numbers of the one or more terminal devices connected to the LAN and telephone numbers of the connection control device connected to the LAN. (2) When an incoming call is received from the telephone to the terminal device, the telephone number of the connection control device corresponding to the telephone number of the terminal device is acquired based on the correspondence table, and (3) the connection control device And the telephone number of the terminal device is transmitted to the connection control device. (1) The telephone number of the terminal device and the LAN of the terminal device
A table corresponding to an address of 1: 1 or 1: n is created, (2) the telephone number of the terminal device transmitted from the exchange is received, and (3) the telephone number is LAN based on the table.
(4) A method of receiving a LAN from a telephone, wherein the telephone is connected to the terminal device. 2. The connection control according to claim 1, wherein the terminal device (1) acquires a LAN address of a terminal device to be connected when an incoming call arrives, and (2) uses the acquired LAN address of the terminal device as a message. To the device, and the connection control device (1) registers the LAN address of the terminal device to be connected when an incoming call arrives, (2) when the incoming call arrives, connects to the registered terminal device, and (3) the terminal device (4) A method of receiving a LAN from a telephone connected to the terminal device having the LAN address specified in the message. 3. The terminal according to claim 1, wherein the connection control device and the exchange are connected by a plurality of lines each having a line number corresponding to a telephone number of the terminal device, and the telephone is connected to the terminal. When the call arrives at the device, the exchange uses the line with the line number corresponding to the telephone number of the terminal device, and the connection control device converts the line address used by the exchange into the LAN address of the terminal device. , LAN incoming method from the telephone connected to the telephone. 4. The multiplexer according to claim 1, further comprising a multiplexer between the connection control device and the exchange, deciding a time slot position corresponding to a telephone number of the terminal device,
When an incoming call is received at the terminal device connected to the AN, the exchange uses the time slot corresponding to the telephone number of the terminal device, and the connection control device determines the terminal according to the position of the time slot used by the exchange. LA of device
LAN from the phone that converts to an N address and connects to the phone
Incoming method. 5. The exchange according to claim 1, wherein: (1) a telephone number of the connection control device, and a second connection control device to be connected when a line between the connection control device and the exchange is in use. (2) When the line between the connection control device and the exchange is in use, the LAN receiving method from the telephone connected to the second connection control device is based on the correspondence table. .