JPH0888686A - Network system - Google Patents

Abstract

PURPOSE: To provide a network system excellent from an economical point of view in which a call is received through a LAN terminal from a video telephone set connected to a public network. CONSTITUTION: Plural LAN terminals 120, 129, 138 being video output devices or the like correspond to an extension video telephone set 107 via a video audio changeover device 115. When a connection request comes from the video telephone set 102 connecting to a public network 101 to a LAN terminal, an exchange 105 specifies the LAN terminal and the extension video telephone set 107 corresponding to the LAN terminal by using a telephone number representing a connection destination to allow the extension video telephone set 107 to receive an incoming call. A connection controller 108 gives a connection request to the LAN terminal and informs the channel number of the LAN terminal to a video audio changeover device 115. The video audio changeover device 115 connects the extension video telephone set 107 to a video output device of the LAN terminal of the noticed channel number. Thus, the call reception from the extension video telephone set 107 of the public network to the LAN terminal is attained. Since plural LAN terminals correspond to the extension video telephone set 107, the system is economical.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network system, and more particularly to a network system which is capable of receiving a call from a videophone device connected to a public network to a LAN terminal and is excellent in economic efficiency.

[0002]

2. Description of the Related Art Conventionally, there is no known network system capable of receiving a call from a videophone device connected to a public network to a LAN terminal. However, if each LAN terminal is provided with a videophone device individually, the
It is possible to easily build a network system capable of receiving an incoming call at the AN terminal.

[0003]

In the conventionally known network system, there is a problem in that the videophone device connected to the public network cannot make an incoming call to the LAN terminal. On the other hand, if each LAN terminal is provided with a videophone device individually, it becomes possible to receive a call from the videophone device connected to the public network to the LAN terminal. However, when the number of LAN terminals is large, there is a problem that it is difficult to realize economically. Therefore, an object of the present invention is to provide a network system which is capable of receiving a call from a videophone device connected to a public network to a LAN terminal and is excellent in economic efficiency.

[0004]

According to a first aspect of the present invention, there is provided a public network, a videophone device connected to the public network, a switch connected to the public network, and a switch connected to the switch. And at least one extension videophone device, a connection control device connected to the videophone device by a control line, and an L switch to which the exchange and the connection control device are connected.
An AN and a plurality of LAN terminals connected to the LAN,
Video output devices installed on these LAN terminals,
The video input device, the audio output device, and the audio input device are connected to the video output device, the video input device, the audio output device, and the audio input device of each LAN terminal by a signal line, and the video telephone device of the extension is connected by a signal line. A network system comprising a video / audio switching device connected and connected to the connection control device by a control line, wherein the exchange has a connection request from a videophone device connected to a public network. Phone number /
Obtain the transfer destination identifier by referring to the transfer destination identifier correspondence information,
When the transfer destination identifier points to an extension videophone device, the transfer destination identifier / transfer destination telephone number correspondence information is referred to by using the transfer destination identifier as a key to acquire the transfer destination telephone number, and the transfer destination telephone number is corresponded to. The connection request is transferred to the extension videophone device, and the connection destination telephone number is notified to the connection control device, and the connection control device uses the connection destination telephone number as a key to change the telephone number / terminal LAN address / switch. Device channel number correspondence information to obtain the terminal LAN address and the switcher channel number, issue a connection request to the LAN terminal of the terminal LAN address via LAN, and specify the switcher channel number via the control line. The video / audio switching device is notified, and the video / audio switching device notifies the signal line from the LAN terminal corresponding to the notified switcher channel number and the extension. The extension video telephone is connected to a signal line from the video telephone, and the video telephone of the extension responds to a connection request from the video telephone connected to the public network, and video and audio from the video telephone connected to the public network. Is received and sent to the LAN terminal via the video / audio switching device, and the video and audio sent from the LAN terminal via the video / audio switching device is received and sent to the videophone device connected to the public network. A network system characterized by the above.

According to a second aspect, the present invention provides an ISDN network, a videophone device connected to the ISDN network, an exchange connected to the ISDN network, and an extension videophone device connected to the exchange. , A connection control device connected to the videophone device by a control line, a LAN to which the connection control device is connected, a plurality of LAN terminals connected to the LAN, and images installed on the LAN terminals. An output device, a video input device, a voice output device, and a voice input device, and a video line device connected to the video output device, the video input device, the voice output device, and the voice input device of each LAN terminal by a signal line and the extension videophone device. A network system comprising: a video / audio switching device connected by a signal line and connected to the connection control device by a control line, wherein the switchboard comprises: Forwards the connection request to the extension of the videophone apparatus when the connected videophone apparatus SDN network a connection request, the extension of the videophone apparatus, I
The SDN call setup message is received, the subaddress in the call setup message is acquired, and the subaddress is notified to the connection control device, and the connection control device uses the subaddress as a key for the subaddress / terminal LAN address / terminal LAN address / terminal address.
The terminal LAN address and the switcher channel number are obtained by referring to the switcher channel number correspondence information, a connection request is issued to the LAN terminal of the terminal LAN address via the LAN, and the switcher channel number is sent via the control line. To the video / audio switching device, and the video / audio switching device is connected to the LAN corresponding to the notified switcher channel number.
A signal line from a terminal is connected to a signal line from the extension videophone device, and the extension videophone device is an ISD.
In response to a connection request from a videophone device connected to the N network, the video and audio from the videophone device connected to the ISDN network are received and sent to the LAN terminal via the video / audio switching device, and the LAN terminal is also provided. The present invention provides a network system characterized in that it receives video and audio sent from the device via the video / audio switching device and sends them to a videophone device connected to an ISDN network.

According to a third aspect, the present invention provides a public network, a video telephone device connected to the public network, an exchange connected to the public network, and an extension video telephone device connected to the exchange. A connection control device connected to the videophone device by a control line and a signal line; a LAN to which the connection control device is connected; and a plurality of Ls connected to the LAN.
A signal is sent to the AN terminal and the video output device, the video input device, the audio output device and the audio input device respectively installed in these LAN terminals, and the video output device, the video input device, the audio output device and the audio input device of each LAN terminal. A network system comprising a video / audio switching device connected by a line and connected to the extension videophone device by a signal line and connected to the connection control device by a control line. When there is a connection request from the videophone device connected to the public network, the connection request is transferred to the extension videophone device, and the extension videophone device requests the connection from the videophone device connected to the public network. In response to the connection, the connection destination identification voice data from the videophone device connected to the public network is received and sent to the connection control device. Using the identification voice data as a key, the connection destination identification voice data / terminal LAN address / switcher channel number correspondence information is referred to obtain the terminal LAN address and the switcher channel number, and the LAN terminal of the terminal LAN address is obtained via the LAN. To the video / audio switching device via a control line, and the video / audio switching device sends a signal line from the LAN terminal corresponding to the notified switcher channel number. And a signal line from the extension videophone device are connected to each other, and the extension videophone device is connected from the videophone device connected to the public network in response to a connection request from the videophone device connected to the public network. Of the video and audio of the above and sent to the LAN terminal through the video and audio switching device, and the video and audio from the LAN terminal. To provide a network system wherein the sending to the TV telephone apparatus that is connected to the public network receives the video and audio sent via the conversion unit.

According to a fourth aspect of the present invention, in the network system having the above configuration, the connection destination identifying image data is used instead of the connection destination identifying voice data or in addition to the connection destination identifying voice data. A network system characterized by the above.

In a fifth aspect, the present invention provides the network system having the above-mentioned configuration, wherein the video / audio switching device is a matrix type switching device.

According to a sixth aspect of the present invention, in the network system having the above-mentioned configuration, the video signal and the audio signal output from the video output device and the audio output device are each L.
A TV signal converter for each terminal that converts the TV signal of the TV channel number assigned to the AN terminal, and each LAN
Each LAN terminal is provided with a terminal-specific TV signal detector that separates a video signal and an audio signal from a TV signal of a TV channel number assigned to the terminal and inputs them to the video input device and the audio input device. Common television signal connected to the terminal-specific TV signal converter and the terminal-specific TV signal detector by a TV signal line, connected to the extension videophone device by a signal line, and connected to the connection control device by a control line. A converter and a shared television signal detector are used in place of the video / audio switching device, and the connection control device sets the television channel number of the connection destination to the shared television signal converter and the shared television signal detector via a control line. The shared TV signal converter is notified of the video signal and the audio signal passed from the extension videophone device. The TV signal of the TV channel number is converted and transmitted to the TV signal line, and the shared TV signal detector receives the TV signal of the notified TV channel number from the TV signal line and separates the video signal and the audio signal. Then, a network system is provided which is characterized in that the video signal and the audio signal are passed to an extension videophone device.

According to a seventh aspect of the present invention, in the network system having the above structure, the present invention has a function of transmitting the video signal and the audio signal output from the video output device and the audio output device to the LAN as packet information, and receiving from the LAN. The function of separating the video signal and the audio signal from the packet information and inputting them to the video input device and the audio input device is provided in each LAN terminal, and the video / audio switching device is omitted, and the extension videophone device and connection control are performed. The connection control device connects the device with a signal line, and the connection control device connects the video signal and the audio signal passed from the extension videophone device to the connection destination L.
It is sent to the LAN as packet information addressed to the AN terminal and LA
(EN) A network system characterized by receiving packet information addressed to itself from N, separating a video signal and an audio signal, and passing the video signal and the audio signal to an extension videophone device.

[0011]

In the network system according to the first aspect, a plurality of LAN terminals are made to correspond to one extension videophone device via the video / audio switching device, and the videophone device connected to the public network is connected to the LAN. When there is a connection request to the terminal, the LAN terminal and the extension videophone device corresponding to the LAN terminal are specified by using the telephone number indicating the connection destination as a key, and the extension videophone device is called, and the video A video switching device and a LAN terminal connected to the public network through the extension video phone device and the video / audio switching device by selectively connecting the extension video phone device and the LAN terminal of the connection destination by the audio switching device. Make a video and audio call between them. As a result, it becomes possible to receive a call from the videophone device connected to the public network to the LAN terminal. Also, a plurality of L's can be connected to one extension videophone device.
Since it corresponds to the AN terminal, it is economical and easy to realize.

In the network system according to the second aspect, a plurality of LAN terminals are made to correspond to one extension videophone device via the video / audio switching device, and ISD is set.
When a connection request is made from the videophone device connected to the N network to the LAN terminal, the subterminal address indicating the connection destination is used as a key to identify the LAN terminal and the extension videophone device corresponding to the LAN terminal, and the extension TV The telephone device receives the call, and the video / audio switching device selectively connects the extension video telephone device and the LAN terminal of the connection destination to the ISDN network via the extension video telephone device and the video / audio switching device. Connected videophone device and LAN
Make a video and audio call with the terminal. As a result, the videophone device connected to the ISDN network can
It becomes possible to receive calls to N terminals. Further, since a plurality of LAN terminals are associated with one extension videophone device, it is economical and easy to realize. Further, since the connection destination is identified by using the subaddress of ISDN, the configuration becomes simple.

In the network system according to the third aspect, a plurality of LAN terminals are made to correspond to one extension videophone device via the video / audio switching device, and the videophone device connected to the public network is connected to the LAN. When the terminal has a connection request, the extension videophone device receives the incoming call, the connection destination identifying voice data is received, the LAN terminal is specified by using the connection destination identifying voice data as a key, and the video / audio switching device is provided. The extension videophone device and the connected LAN
A terminal is selectively connected to make a video and audio call between a LAN terminal and a videophone device connected to a public network via an extension videophone device and a video / audio switching device. As a result, it becomes possible to receive a call from the videophone device connected to the public network to the LAN terminal. Also, 1
Since a plurality of LAN terminals are associated with the extension videophone device, it is economical and easy to realize. Moreover, since the connection destination is identified by using the voice data, the configuration is simplified.

In the network system according to the fourth aspect, a plurality of LAN terminals are associated with one extension videophone device via the video / audio switching device, and the videophone device connected to the public network is connected to the LAN. When a connection request is made to the terminal, the extension videophone device receives the incoming call and receives the connection destination identification image data or the connection destination identification image data and the connection destination identification voice data, and the LAN terminal is used as a key. The videophone device of the extension is specified and the extension videophone device and the LAN terminal of the connection destination are selectively connected, and is connected to the public network via the extension videophone device and the videoaudio switching device. A video and audio call is made between the videophone device and the LAN terminal. As a result, it becomes possible to receive a call from the videophone device connected to the public network to the LAN terminal. Further, since a plurality of LAN terminals are associated with one extension videophone device, it is economical and easy to realize. Further, since the connection destination is identified by using the image data or the image data and the audio data, the configuration is simplified.

In the network system according to the fifth aspect, a matrix type switching device is used as the video / audio switching device. According to this, in addition to the above operation, one input channel can be connected to a plurality of output channels, so that the video and audio of the videophone device connected to the public network can be simultaneously received by a plurality of LAN terminals. . Also, since LAN terminals can be connected to each other, LA
The function equivalent to the videophone device can be used between N terminals.

[0016] In the network system according to the sixth aspect, one extension video telephone device and a plurality of LAN terminals are connected by a television signal line. Then, instead of selectively connecting the extension videophone device and the connection destination LAN terminal with the video / audio switching device, the extension videophone device and the connection destination LAN terminal are selectively connected according to the TV channel number. . According to this, in addition to the above operation, since the television signal line is used, the extension video telephone device and LA are connected.
Wiring between the N terminal is simplified.

In the network system according to the seventh aspect, video and audio communication between the extension videophone device and the LAN terminal of the connection destination is performed on the LAN. According to this, in addition to the above operation, a dedicated wiring for video and audio communication becomes unnecessary.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to this.

First Embodiment FIG. 1 is a block diagram of the essential parts of a network system 1 according to the first embodiment of the present invention. A videophone device 102 is connected to the public network 101. Also, the public network 1
01 to the exchange 105 via the external telephone line 103.
Is connected. The exchange 105 is an exchange in which the capacity of a computer and a LAN interface are added to an existing exchange. The exchange 105 is connected to the LAN 104 and is also connected to a videophone device 107 via an extension telephone line 106.

The LAN 104 is connected to the connection control device 10
8, terminal A120, terminal B129, and terminal C138
And are connected. The connection control device 108 has a computer capability and a LAN interface, and is connected to the videophone device 107 via a control line 109 and to the video / audio switch 115 via a control line 110. . The terminal A 120 has a computer capability and L
It is provided with an AN interface, a display 116 capable of synthesizing and displaying an image as a computer and a video from the outside, a speaker 122, a camera 117, and a microphone 121. The terminal B 129 has a computer capacity and LA
It is provided with an N interface, a display 125 capable of synthesizing and displaying an image as a computer and a video from the outside, a speaker 131, a camera 126, and a microphone 130. The terminal C138 is a computer and LAN.
It is provided with an interface, a display 134 capable of compositely displaying an image as a computer and a video from the outside, a speaker 140, a camera 135, and a microphone 139.

The videophone device 107 has an interface (for example, RS232) that can be controlled by an external computer.
C interface), an interface capable of inputting video and audio from the outside, and an interface capable of outputting video and audio to the outside are videophone devices (for example, commercially available). Hitachi videophone device HV-100 and DP
-200). The video / audio switch 115 is connected to the videophone device 107 via a video signal line 112, an audio signal line 114, a video signal line 111, and an audio signal line 113. The video / audio switch 115 is connected to the camera 117 via a video signal line 118, connected to the display 116 via a video signal line 119, and connected to the microphone 121 via an audio signal line 123. And the speaker 122 through the audio signal line 124.
It is connected to the. Also, the video / audio switch 115
Are connected to the camera 126 via a video signal line 127, and the display 12 via a video signal line 128.
5 and is connected to the microphone 1 via an audio signal line 132.
30 and is connected to the speaker 131 via an audio signal line 133. Further, the video / audio switch 115 is connected to the camera 13 via the video signal line 136.
5, the video signal line 137 is connected to the display 134, the audio signal line 141 is connected to the microphone 139, and the audio signal line 142 is connected to the speaker 140.

FIG. 2 is an explanatory diagram of the configuration of the exchange 105. The exchange 105 includes a CPU 201 and a memory 203.
And a memory controller 202 for controlling data transfer
, An external telephone line communication control interface 204 connected to the external telephone line 103, and an internal telephone line communication control interface 205 connected to the internal telephone line 106.
, A LAN communication control interface 206 connected to the LAN 104, and a bus 200.
The memory 203 holds a telephone number / transfer destination identifier correspondence table 150 and a transfer destination identifier / transfer destination telephone number correspondence table 160.

FIG. 3 is a configuration diagram of the telephone number / transfer destination identifier correspondence table 150. The telephone number / transfer destination identifier correspondence table 150 is a table in which the extension telephone number 151 and the transfer destination identifier 152 are associated with each other. When the transfer destination identifier 152 is “0”, the call is a normal call and the call may be connected to the extension of the phone number 151. On the other hand, if the transfer destination identifier 152 is not "0", the call is received at the terminal and transfer to the videophone corresponding to the terminal is necessary. It should be noted that one videophone corresponds to one or more terminals. For example, in FIG. 1, one videophone 107 includes at least three terminals 120, 129, 13
It corresponds to 8.

FIG. 4 is an explanatory diagram of the structure of the transfer destination identifier / transfer destination telephone number correspondence table 160. Transfer destination identifier /
The transfer destination telephone number correspondence table 160 is a transfer destination identifier 1
6 is a table in which 61 and a transfer destination telephone number 162 are associated with each other. The transfer destination telephone number 162 is a videophone number.

FIG. 5 is an explanatory diagram of the configuration of the connection control device 108. The connection control device 108 is a device that is connected to the CPU 211, the memory 213, the memory controller 212 that controls data transfer, the LAN communication control interface 215 that is connected to the LAN 104, the videophone device 107, and the video / audio switcher 115. It is configured to include a control communication interface 214 and a bus 210.
The memory 213 has a telephone number / terminal LAN address /
A switcher channel number correspondence table 165 is held.

FIG. 6 shows a telephone number / terminal LAN address /
It is a structure explanatory view of a switcher channel number correspondence table 165. The telephone number / terminal LAN address / switch channel number correspondence table 165 is an extension telephone number 166.
And a terminal LAN address 167 of the corresponding terminal and a switcher channel number 168 of the video / audio switcher 115 corresponding to the terminal.

FIG. 7 is an explanatory diagram of the video / audio switch 115. The video / audio switch 115 is a matrix-type switch having n channels on each of the input side and the output side. One input channel can be connected to one or more output channels. One channel is
It consists of a set of one video signal and one audio signal. For example, when the device connected to channel 0 and the device connected to channel 2 communicate video and audio with each other, the end points 221a and 221b are set to the connected state.

FIG. 8 shows a sequence for receiving an incoming call from the videophone device 102 connected to the public network 101 to the terminal A120. The videophone device 102 connected to the public network 101 makes a connection request (170) using the external telephone number and the internal telephone number Ai assigned to the terminal A120. This connection request 170 is issued by the public network 10
1 to the exchange 105. The exchange 105 acquires the transfer destination telephone number from the telephone number Ai using the telephone number / transfer destination identifier correspondence table 150 and the transfer destination identifier / transfer destination telephone number correspondence table 160, and the videophone device 107 of the transfer destination telephone number. Transfer connection request to (17
Perform 1). Further, the exchange 105 uses the telephone number Ai.
Is notified to the connection control device 108 (172). The connection control device 108 obtains the terminal LAN address of the terminal A120 from the telephone number Ai using the telephone number / terminal LAN address / switcher channel number correspondence table 165, and issues a connection request (173) to the terminal A120.

Terminal A12 which received the connection request (173)
0 returns a response (174) to the connection control device 108. When confirming that the response (174) is an affirmative response, the connection control means 108 uses the telephone number / terminal LAN address / switcher channel number correspondence table 165 to switch the switch channel of the video / audio switcher 115 from the telephone number Ai. A switching instruction (175) indicating that the number of the switcher channel number is acquired and the channel of the switcher channel number and the channel to which the videophone device 107 is connected (the switcher channel number is predetermined) are displayed. Voice switcher 11
Send to 5. Further, the connection control measure 108 is the exchange 105.
A response instruction (175) indicating that an incoming call should be made in response to the transfer connection request (171) is sent to the videophone device 107. The videophone device 107 instructs the response (175).
When it receives, the response (177) is returned to the exchange 105.
Upon receiving the response (177), the exchange 105 returns an incoming call response (178) to the videophone device 102 connected to the public network 101. After that, the extension videophone device 10
7 and the video / audio switch 115, the public network 101
A video and audio call (179) between the videophone device 102 and the terminal A 120, which are connected to each other, is realized.

FIG. 9 shows the exchange 105 and the connection control device 10.
8 and the processing flow of the videophone device 107. When the exchange 108 receives the connection request from the public network 101 (1
80), referring to the telephone number / transfer destination identifier correspondence table 150 with the telephone number of the connection destination as a key, the transfer destination identifier is acquired (181). Next, it is determined whether the acquired transfer destination identifier is "0". If the acquired transfer destination identifier is “0”, the connection destination telephone number is connected as a normal extension telephone (188), and if there is a response (189), a sequence for reaching a normal call is performed. Is executed (187). If the obtained transfer destination identifier is not "0", the transfer destination identifier / transfer destination telephone number correspondence table 160 is referenced with the transfer destination identifier as a key to obtain the transfer destination telephone number (183). Next, a connection request is issued to the videophone device 107 having the acquired transfer destination telephone number (184). Also, the telephone number of the connection destination is sent to the connection control device 108 by the LAN1.
Notify via 04 (190). After this, the exchange 10
5 enters a waiting state for receiving a response from the videophone device 107 (185).

The connection control device 108 acquires the terminal LAN address of the LAN terminal by referring to the telephone number / terminal LAN address / switch channel number correspondence table 165 using the telephone number of the connection destination as a key (191). Next, a connection request for the acquired terminal LAN address is issued to the LAN 10
Put on 4 (192). L receiving a connection request to itself
The AN terminal returns a response to the connection control device 108 (19
3). Connection control device 1 that receives a response from the LAN terminal
08 is a telephone number / using the telephone number of the connection destination as a key.
The switcher channel number is acquired by referring to the terminal LAN address / switcher channel number correspondence table 165 (1
94). Next, the acquired switcher channel number and switching instruction are sent to the video / audio switcher 115 (195). Next, a response instruction is issued to the videophone device 107 (19
6). Upon receiving the response instruction, the videophone device 107 returns a response to the exchange 105 (197). The exchange 105, which has received the response from the videophone device 107 in the response waiting state (185), returns an incoming response to the videophone device 102 connected to the public network 101 (186). After that, the extension videophone device 107 and the video / audio switcher 115
A videophone device 1 connected to the public network 101 via
A video and audio call between 02 and the LAN terminal is realized (187).

According to the above first embodiment, the following effects can be obtained. (1) It is possible to receive an incoming call from the videophone device of the public network to the LAN terminal. (2) A plurality of LAN terminals can be associated with one videophone device and the videophone device can be shared and used.
As a result, the system can be constructed economically as compared with the case where a videophone device is installed for each LAN terminal. (3) Since the video / audio switcher 115 employs a matrix type switcher, if one input channel is connected to a plurality of output channels, a plurality of LAN terminals can simultaneously receive the video and audio of the videophone device 102. can do. It is also possible to connect LAN terminals to each other, and a function equivalent to a videophone device can be provided between LAN terminals.

-Second Embodiment-The second embodiment is the public network 101 and the exchange 10 of the first embodiment.
5, videophone device 107 and connection control device 108
Is an example in which the ISDN network 300, the exchange 301, the videophone device 302, and the connection control device 303 are replaced.

FIG. 10 is a block diagram of the essential parts of the network system 2 according to the second embodiment of the present invention. A videophone device 102 is connected to the ISDN network 300.
In addition, the ISDN network 300 has an external telephone line 103.
The exchange 301 is connected via the. The exchange 301 is an existing exchange that can be connected to an ISDN network, and uses the extension telephone line 106 to connect the video telephone device 30.
Connected to 2. The videophone device 302 has the same function as the videophone device 107 of the first embodiment, and also has the function of receiving the subaddress included in the ISDN call setup message. Connection control device 30
3 has a function equivalent to that of the connection control device 108 of the first embodiment, and holds a subaddress / terminal LAN address / switcher channel number correspondence table in the memory.

FIG. 11 is a diagram showing the structure of the sub-address / terminal LAN address / switcher channel number correspondence table 310. The sub-address / terminal LAN address / switcher channel number correspondence table 310 includes a sub-address 311 and the terminal LAN address 1 of the terminal corresponding thereto.
67 is a table in which 67 and the switcher channel number 168 of the video / audio switcher 115 corresponding to the terminal are associated with each other.

FIG. 12 shows a sequence for receiving a call from the videophone device 102 connected to the ISDN network 300 to the terminal A 120. The videophone device 102 connected to the ISDN network 300 makes a connection request (320) using the telephone number of the videophone device 302 corresponding to the terminal A120 and the sub-address Si assigned to the terminal A120. Connection request from ISDN network 300 (3
The exchange 301, which has been notified of 20), requests a connection (32) to the videophone device 302 in the same manner as a normal extension telephone connection.
Issue 1). The videophone device 302 is preset to respond to all subaddresses. Upon receiving the connection request (321), the videophone device 302 receives the ISDN
The sub-address Si is extracted from the sub-address designation field in the call setting message of and the connection control device 303 is notified (322). The connection control device 303 uses the subaddress / terminal LAN address / switcher channel number correspondence table 310 to change the subaddress Si to the terminal A12.
The terminal LAN address of 0 is acquired, and a connection request (173) is made to the terminal A 120.

Terminal A12 which received the connection request (173)
0 returns a response (174) to the connection control device 303. When confirming that the response (174) is an affirmative response, the connection control means 303 uses the subaddress / terminal LAN address / switcher channel number correspondence table 310 to change the switcher channel number of the video / audio switcher 115 from the subaddress Si. A switching instruction (176) indicating that the channel having the switcher channel number and the channel to which the videophone device 302 is connected (the switcher channel number is predetermined) is acquired and the audio / video switch is performed. Take out to vessel 115. Also, the connection control measure 303 issues a response instruction (175) indicating that the incoming call should be made to the connection request (321) from the exchange 301 to the videophone device 302.
Send out. The videophone device 302 receives the response instruction (17
When 5) is received, the response (177) is returned to the exchange 301. Upon receiving the response (177), the exchange 301 receives the videophone device 10 connected to the ISDN network 300.
2 returns an incoming call response (178). After that, via the extension videophone device 302 and the video / audio switching device 115, I
A video and audio call (179) between the videophone device 102 connected to the SDN network 300 and the terminal A 120 is realized. The call setup message is transparently delivered to the terminal.

FIG. 13 shows the exchange 301 and the connection control device 3.
03 and the videophone device 302. Upon receiving the connection request from the ISDN network 300 (330), the exchange 301 issues a connection request to the telephone number of the connection destination (3
31) and enters a response reception waiting state (332). Upon receiving the connection request, the videophone device 302 acquires the subaddress from the call setup message (335) and notifies the connection control device 303 of the subaddress (336). The connection control device 303 refers to the sub-address / terminal LAN address / switcher channel number correspondence table 310 using the notified sub-address as a key, and acquires the terminal LAN address corresponding to the notified sub-address (33).
7). Next, the connection control device 303 uses the acquired terminal LA
A connection request is issued to the N address via the LAN 104 (3
38).

Upon receiving the connection request for itself, the LAN terminal returns a response to the connection control device 303 (339). After confirming that the response is a positive response, the connection control device 303 refers to the subaddress / terminal LAN address / switcher channel number correspondence table 310 using the subaddress of the LAN terminal as a key, and acquires the switcher channel number. (340). Next, the connection control device 303 sends the acquired switcher channel number and switching instruction to the video / audio switcher 115 (341). Next, the videophone device 3
A response instruction is issued to 02 (342). Upon receiving the response instruction, the videophone device 302 returns a response to the exchange 301 (3
43). The exchange 301 that has received the response from the videophone device 302 in the response reception waiting state (332) receives the ISDN.
An incoming call response is returned to the videophone device 102 connected to the network 300 (333). After this, the extension videophone device 30
2 and the video / audio switch 115, the ISDN network 3
A video and audio call is realized between the videophone device 102 connected to 00 and the LAN terminal (334).

According to the second embodiment described above, the following effects can be obtained. (1) It is possible to receive an incoming call from the videophone device of the public network to the LAN terminal. (2) A plurality of LAN terminals can be associated with one videophone device and the videophone device can be shared and used.
As a result, the system can be constructed economically as compared with the case where a videophone device is installed for each LAN terminal. (3) Since the subaddress in the ISDN call setup message is associated with the LAN terminal, the exchange 301
It is not necessary to add a special function other than the function capable of connecting to the ISDN network 300. (4) Originally, the subaddress of ISDN is used to identify up to eight devices connected to one line by a daisy chain. However, in the configuration of the second embodiment, since it is not connected by the daisy chain, the number of shared LAN terminals can exceed eight.

Third Embodiment In the third embodiment, the exchange 105 and the connection control device 108 of the first embodiment are replaced by the exchange 355 and the connection control device 35.
This is an example in which 0A is substituted.

FIG. 14 is a block diagram of the essential parts of the network system 3 according to the third embodiment of the present invention. Exchange 35
Reference numeral 5 is an existing exchange that can be connected to the public network 101.
The connection control device 350A is the connection control device 1 of the first embodiment.
A video signal line 351 connected to the video signal line 111, a video signal line 352 connected to the video signal line 112, and an audio signal line 353 connected to the audio signal line 113. , And an interface for connection with the audio signal line 354 connected to the audio signal line 114.

FIG. 15 is an explanatory diagram of the configuration of the connection control device 350A. The connection control device 350A has a CPU 361.
A memory 363A, a memory controller 362 for controlling data transfer, and a LAN connected to the LAN 104.
Communication control interface 366 and videophone 10
7 and the video / audio switcher 115, a device control communication interface 367, a video input / output interface 365 for inputting / outputting video, an audio input / output interface 364 for inputting / outputting audio, and a bus 36.
And 0. The memory 363A holds a rough voice data / terminal LAN address / switcher channel number correspondence table 370.

FIG. 16 is an explanatory diagram of the structure of the rough voice data / terminal LAN address / switcher channel number correspondence table 370. The rough voice data / terminal LAN address / switcher channel number correspondence table 370 includes the rough voice data 371 and the terminal LAN address 1 of the corresponding terminal.
67 is a table in which 67 and the switcher channel number 168 of the video / audio switcher 115 corresponding to the terminal are associated with each other. Here, the rough voice data 371 is the minimum voice data necessary for identifying each LAN terminal. For example, a push tone and a real voice of a specific word can be cited.

The sequence when an incoming call is received from the videophone device 102 connected to the public network 101 to a specific LAN terminal is as follows. The videophone device 102 connected to the public network 101 makes a connection request by using the telephone number of the videophone device 107 corresponding to the LAN terminal of the connection destination. Exchange 3 notified of a connection request from the public network 101
55 issues a connection request to the videophone device 107 in the same way as a normal extension telephone connection. Upon receiving the connection request, the videophone device 107 notifies the connection control device 350A that the connection request has been received. Upon receiving the notification, the connection control device 350A issues, to the videophone device 107, a response instruction indicating that an incoming call should be received in response to the connection request from the exchange 355. Upon receiving the response instruction, the videophone device 107 returns a response to the exchange 355. Upon receiving the response, the exchange 355 returns an incoming call response to the videophone device 102 connected to the public network 101. As a result, the videophone device 102 and the extension videophone device 107 connected to the public network 101 are connected.
It enables video and audio communication between

Here, the connection control device 350A uses the voice guidance and / or the video guidance stored in the memory 363 in advance as the voice input / output interface 364.
And / or from the video input / output interface 365,
Input to the videophone device 107 via the audio signal line 353 and / or the video signal line 351. Public network 101
The videophone device 102 connected to the LA is connected to the LA of the connection destination according to the voice guidance and / or the video guidance.
Input the coarse voice corresponding to the N terminal. Videophone 1
07 outputs the received rough voice to the voice signal line 114. The connection control device 350A acquires the coarse audio data on the audio signal line 114 via the audio signal line 354 and the audio input / output interface 364. Then, referring to the rough voice data / terminal LAN address / switcher channel number correspondence table 370 using the rough voice data as a key, the terminal LA
Get N address and switcher channel number. An existing matching algorithm is used for matching the rough voice data. The operation after obtaining the terminal LAN address and the switcher channel number is similar to that of the first embodiment (however, no incoming call response is issued).

According to the above third embodiment, the following effects can be obtained. (1) It is possible to receive an incoming call from the videophone device of the public network to the LAN terminal. (2) A plurality of LAN terminals can be associated with one videophone device and the videophone device can be shared and used.
As a result, the system can be constructed economically as compared with the case where a videophone device is installed for each LAN terminal. (3) Since the coarse voice is associated with the LAN terminal, the exchange 3
The 55 does not require any special function addition.

-Fourth Embodiment- In the fourth embodiment, the connection control device 350A of the third embodiment is
In this embodiment, the connection control device 350V is replaced.

FIG. 17 is a block diagram of the essential parts of the network system 4 according to the fourth embodiment of the present invention. The connection control device 350V has the same function as the connection control device 108 of the first embodiment, and has a video signal line 351 connected to the video signal line 111 and a video signal line 352 connected to the video signal line 112. , An interface for connecting an audio signal line 353 connected to the audio signal line 113 and an audio signal line 354 connected to the audio signal line 114.

FIG. 18 is an explanatory diagram of the configuration of the connection control device 350V. The connection control device 350V has a CPU 361.
A memory 363, a memory controller 362 for controlling data transfer, a LAN communication control interface 366 connected to the LAN 104, and a videophone device 107.
A device control communication interface 367 connected to the video / audio switch 115, a video input / output interface 365 for inputting / outputting video, an audio input / output interface 364 for inputting / outputting audio, and a bus 360.
And is configured. The memory 363V holds a rough image data / terminal LAN address / switcher channel number correspondence table 380.

FIG. 19 is a diagram showing the construction of the rough image data / terminal LAN address / switcher channel number correspondence table 380. The rough image data / terminal LAN address / switcher channel number correspondence table 380 includes the rough image data 381 and the terminal LAN address 1 of the terminal corresponding thereto.
67 is a table in which 67 and the switcher channel number 168 of the video / audio switcher 115 corresponding to the terminal are associated with each other. Here, the rough image data 381 is the minimum image data necessary for identifying each LAN terminal. For example, a bar code or a card on which a rough image is printed can be used.

The sequence when an incoming call is received from the videophone device 102 connected to the public network 101 to a specific LAN terminal is as follows. The videophone device 102 connected to the public network 101 makes a connection request by using the telephone number of the videophone device 107 corresponding to the LAN terminal of the connection destination. Exchange 3 notified of a connection request from the public network 101
55 issues a connection request to the videophone device 107 in the same way as a normal extension telephone connection. Upon receiving the connection request, the videophone device 107 notifies the connection control device 350V that the connection request has been received. Upon receiving the notification, the connection control device 350V issues, to the videophone device 107, a response instruction indicating that the connection request from the exchange 355 should be received. Upon receiving the response instruction, the videophone device 107 returns a response to the exchange 355. Upon receiving the response, the exchange 355 returns an incoming call response to the videophone device 102 connected to the public network 101. As a result, the videophone device 102 and the extension videophone device 107 connected to the public network 101 are connected.
It enables video and audio communication between

Here, the connection control device 350V uses the voice input / output interface 364 for the voice guidance and / or the video guidance stored in the memory 363 in advance.
And / or from the video input / output interface 365,
Input to the videophone device 107 via the audio signal line 353 and / or the video signal line 351. Public network 101
The videophone device 102 connected to the LA is connected to the LA of the connection destination according to the voice guidance and / or the video guidance.
Input a rough image corresponding to N terminals. Videophone 1
07 outputs the received rough image to the video signal line 112. The connection control device 350V acquires the rough image data on the video signal line 112 via the video signal line 352 and the video input / output interface 365. Then, using the rough image data as a key, the rough image data / terminal LAN address / switcher channel number correspondence table 380 is referred to, and the terminal LA
Get N address and switcher channel number. An existing matching algorithm is used for matching the rough image data. The operation after obtaining the terminal LAN address and the switcher channel number is similar to that of the first embodiment (however, no incoming call response is issued).

According to the above fourth embodiment, the following effects can be obtained. (1) It is possible to receive an incoming call from the videophone device of the public network to the LAN terminal. (2) A plurality of LAN terminals can be associated with one videophone device and the videophone device can be shared and used.
As a result, the system can be constructed economically as compared with the case where a videophone device is installed for each LAN terminal. (3) Since the rough image is associated with the LAN terminal, the exchange 3
The 55 does not require any special function addition.

-Fifth Embodiment- A fifth embodiment is an embodiment in which video and audio communication is performed between the extension video telephone device 107 and a LAN terminal using a television signal.

FIG. 20 is a block diagram of the essential parts of the network system 5 according to the fifth embodiment of the present invention. The videophone device 107 includes a video signal line 112 and an audio signal line 11
4 to the television signal converter 392. In addition, the videophone device 107 includes the video signal line 111.
And the television signal detector 3 via the audio signal line 113.
It is connected to 93. The television signal converter 392 is connected to the connection control device 108 ′ by the control line 390. Further, the television signal converter 392 uses the coaxial cable 394 to transmit the television signal detector 3 of each LAN terminal.
96, ... TV signal detector 393
Are connected to the connection control device 108 ′ by the control line 391. The television signal detector 393 is connected to the television signal converters 397, ... Of each LAN terminal by a coaxial cable 395.

Television signal detector 396 of each LAN terminal
Is displayed on the display 11 by the video signal lines 119.
6 are connected to the speakers 122, ... By the audio signal lines 124 ,. Further, the television signal detectors 396, ... Are connected to the respective LAN terminals 400 ,. Each LAN
The television signal converters 397, ... Of the terminals are connected to the video signal line 11
Is connected to the camera 117, ...
The audio signal lines 123 are connected to the microphones 121. The television signal converters 397, ... Are connected to the respective LAN terminals 400 ,.

The sequence when an incoming call is received from the videophone device 102 connected to the public network 101 to the LAN terminal A400 is as follows. The videophone device 102 connected to the public network 101 makes a connection request using the external telephone number and the internal telephone number Ai assigned to the LAN terminal A400. This connection request is issued by the public network 101.
To the exchange 105. The exchange 105 acquires the transfer destination telephone number from the telephone number Ai using the telephone number / transfer destination identifier correspondence table 150 and the transfer destination identifier / transfer destination telephone number correspondence table 160, and the videophone device 107 of the transfer destination telephone number. Make a transfer connection request to. Further, the exchange 105 notifies the connection control device 108 'of the telephone number Ai. Connection control device 10
8'is a telephone number Ai to a LAN using a telephone number / terminal LAN address / TV channel number correspondence table.
The terminal LAN address of the terminal A400 is acquired and a connection request is made.

Upon receiving the connection request for itself, the LAN terminal A 400 returns a response to the connection control device 108 '. Also, it activates its own television signal detector 396 and television signal converter 397. When confirming that the response is an affirmative response, the connection control measure 108 'acquires the television channel number from the telephone number Ai using the telephone number / terminal LAN address / television channel number correspondence table, and the television channel number is transmitted to the television. Signal converter 39
2 and the television signal detector 393. Further, the connection control measure 108 ′ issues to the videophone device 107 a response instruction to the effect that an incoming call should be received in response to the transfer connection request from the exchange 105. Upon receiving the response instruction, the videophone device 107 returns a response to the exchange 105. Exchange 1
Upon receiving the response, 05 returns an incoming response to the videophone device 102 connected to the public network 101.

Thereafter, a video and audio call is realized between the videophone device 102 connected to the public network 101 and the terminal A 120. That is, the video signal and the audio signal from the videophone device 102 connected to the public network 101 are received by the videophone device 107 and sent to the video signal converter 392. The television signal converter 392 converts the video signal and the audio signal into a television signal (RF signal) of the television channel number assigned to the LAN terminal 400, and sends the television signal to the coaxial cable 394. The television signal detector 396 receives the television signal of the television channel number assigned to the LAN terminal 400, separates the video signal and the audio signal from the television signal, sends the video signal to the display 116, and outputs the audio signal to the speaker 122. Send to. On the other hand, the video signal from the camera 117 and the microphone 1
The audio signal from the No. 21 is LA by the TV signal converter 397.
It is converted into a television signal (RF signal) of the television channel number assigned to the N terminal 400, and the coaxial cable 39
Sent to 5. The TV signal detector 393 is a LAN
It receives the television signal of the television channel number assigned to the terminal 400, separates the video signal and the audio signal from the television signal, and sends them to the videophone device 107. The videophone device 107 sends the video signal and the audio signal to the videophone device 102 connected to the public network 101 via the exchange 105 and the public network 101.

According to the above fifth embodiment, the following effects can be obtained. (1) It is possible to receive an incoming call from the videophone device of the public network to the LAN terminal. (2) A plurality of LAN terminals can be associated with one videophone device and the videophone device can be shared and used.
As a result, the system can be constructed economically as compared with the case where a videophone device is installed for each LAN terminal. (3) The number of connections between the extension videophone device 107 and each LAN terminal is two regardless of the number of LAN terminals. (4) The function of the videophone between LAN terminals is the LA
This can be realized by using the TV channel number assigned to N terminals. (5) If the same TV channel number is used by a plurality of LAN terminals, the video and audio of the videophone device 102 can be simultaneously received by a plurality of LAN terminals. (6) By inputting the video signal and the audio signal from the existing TV tuner to the TV signal converter 392, the function of the cable TV can be obtained.

-Sixth Embodiment- A sixth embodiment is an embodiment for performing video and audio communication between an extension video telephone device and each LAN terminal via the LAN 104.

FIG. 21 is a block diagram of the essential parts of the network system 6 according to the sixth embodiment of the present invention. The videophone device 107 is connected to the connection control device 410 via video signal lines 111 and 112 and audio signal lines 113 and 114. The camera 117 of each LAN terminal 411, ...
Are connected to each LAN terminal 41 via the video signal lines 118 ,.
1, ... The microphone 121 of each LAN terminal 411, ... Is connected to each LA via the audio signal line 123 ,.
Are connected to N terminals 411, .... Each LAN terminal 41
The speakers 122 of 1, ... Are connected to the respective LAN terminals 411 ,.

FIG. 22 is an explanatory diagram of the configuration of the connection control device 410. The connection control device 410 includes a CPU 361, a memory 363, a memory controller 362 that controls data transfer, a LAN communication control interface 366 connected to the LAN 104, a device control communication interface 367 connected to the videophone device 107, A video input / output interface 365 for inputting / outputting video,
Voice input / output interface 3 for inputting / outputting voice
64 and a bus 360. The memory 363 holds a rough audio data (or rough video data) / terminal LAN address correspondence table 375.

FIG. 23 is an explanatory diagram of the configuration of the LAN terminal A411. The LAN terminal 411 includes a CPU 421, a memory 423, a memory controller 422 that controls data transfer, and a VRAM (Video RA) that holds video data.
M) 424, LAN communication control interface 427 connected to LAN 104, video input / output interface 426 connected to video signal line 118, and audio signal line 1
The audio input / output interface 425 connected to 23 and 124 and the bus 420 are provided.

The sequence for receiving an incoming call from the videophone device 102 connected to the public network 101 to the LAN terminal A 411 is as follows. The videophone device 102 connected to the public network 101 makes a connection request using the external telephone number and the internal telephone number Ai assigned to the LAN terminal A411. This connection request is issued by the public network 101.
To the exchange 105. The exchange 105 acquires the transfer destination telephone number from the telephone number Ai using the telephone number / transfer destination identifier correspondence table 150 and the transfer destination identifier / transfer destination telephone number correspondence table 160, and the videophone device 107 of the transfer destination telephone number. Make a transfer connection request to. Further, the exchange 105 notifies the connection control device 410 of the telephone number Ai. Connection control device 410
Uses the telephone number / terminal LAN address correspondence table to acquire the terminal LAN address of the LAN terminal A411 from the telephone number Ai and makes a connection request to the LAN terminal A411.

LAN terminal A411 that received the connection request
Returns a response to the connection control device 410. Connection control measures 4
When confirming that the response is an affirmative response, 10 issues to the videophone device 107 a response instruction to the effect that an incoming call should be made to the transfer connection request from the exchange 105. Upon receiving the response instruction, the videophone device 107 returns a response to the exchange 105. Upon receiving the response, the exchange 105 returns an incoming call response to the videophone device 102 connected to the public network 101. After that, a video and audio call is realized between the videophone device 102 connected to the public network 101 and the LAN terminal A 411. That is, the video signal and the audio signal from the videophone device 102 connected to the public network 101 are received by the videophone device 107 and input to the connection control device 410. The connection control device 410 packetizes the input video signal and audio signal via the LAN communication control interface 366 and sends them to the LAN 104. The LAN terminal A 411 receives a packet addressed to itself on the LAN 104 via the LAN communication control interface 427 and extracts a video signal and an audio signal from the packet data. The video signal is transferred by the memory controller 422 to the VRAM 424 via the bus 420 and displayed on the display 116. The audio signal is transferred by the memory controller 422 to the audio input / output interface 425 via the bus 420 and output to the speaker 122 via the audio signal line 124.

On the other hand, the video signal from the camera 117 is transmitted via the video signal line 118 to the video input / output interface 4
26, and by the memory controller 422,
LAN communication control interface 4 via the bus 420
27 is transferred. A voice signal from the microphone 121 is input to the voice input / output interface 425 via the voice signal line 123, and transferred by the memory controller 422 to the LAN communication control interface 427 via the bus 420. The LAN communication control interface 427 packetizes the video signal and the audio signal and sends them to the LAN 104 addressed to the connection control device 410. The connection control device 410 receives a packet addressed to itself on the LAN 104 via the LAN communication control interface 366 and extracts a video signal and an audio signal from the packet data. The video signal is transmitted by the memory controller 362 via the bus 360 to the video input / output interface 3
65, and is output to the videophone device 107 via the video signal line 111. The audio signal is transferred to the audio input / output interface 364 by the memory controller 362 via the bus 360, and the audio signal line 113 is transmitted.
Is output to the videophone device 107 via. The videophone device 107 sends the video signal and the audio signal to the videophone device 102 connected to the public network 101 via the exchange 105 and the public network 101. According to the above sixth embodiment, the following effects can be obtained. (1) It is possible to receive an incoming call from the videophone device of the public network to the LAN terminal. (2) A plurality of LAN terminals can be associated with one videophone device and the videophone device can be shared and used.
As a result, the system can be constructed economically as compared with the case where a videophone device is installed for each LAN terminal. (3) Since video and audio are communicated via the LAN 104, it is not necessary to separately wire a cable for transmitting a video signal and an audio signal. (4) The videophone device on the LAN 104 and the videophone device on the public network can be connected to each other. If the video and audio encoding method used by the video telephone device on the LAN 104 is different from the video and audio encoding method used by the public telephone video telephone device, the connection control device 410 may be used for conversion.

[0069]

According to the network system of the present invention, it becomes possible to receive an incoming call from the videophone device of the public network to the LAN terminal. Also, a plurality of L's can be connected to one extension videophone device.
Since it is compatible with AN terminals, it is highly economical.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of an exchange according to the first embodiment.

FIG. 3 is a configuration diagram of a telephone number / transfer destination identifier correspondence table.

FIG. 4 is a configuration diagram of a transfer destination identifier / transfer destination telephone number correspondence table.

FIG. 5 is a configuration diagram of a connection control device in the first embodiment.

FIG. 6 is a configuration diagram of a telephone number / terminal LAN address / switcher channel number correspondence table.

FIG. 7 is an explanatory diagram of a configuration of a video / audio switch.

FIG. 8: A videophone device connected to a public network to a LAN
It is a sequence diagram in a 1st Example of the procedure to receive a call to a terminal.

FIG. 9: A videophone device connected to a public network to a LAN
It is a flowchart in 1st Example of the procedure to receive a call to a terminal.

FIG. 10 is a configuration diagram of main parts of a network system according to a second embodiment of the present invention.

FIG. 11 is a configuration diagram of a sub-address / terminal LAN address / switcher channel number correspondence table.

FIG. 12: LA from the videophone device connected to the public network
It is a sequence diagram in a 2nd example of the procedure of receiving a call to N terminal.

FIG. 13: LA from a videophone device connected to the public network
It is a flowchart in a 2nd Example of the procedure which receives a call to N terminal.

FIG. 14 is a configuration diagram of a main part of a network system according to a third embodiment of the present invention.

FIG. 15 is a configuration diagram of a connection control device in a third embodiment.

FIG. 16 is a configuration diagram of a rough voice data / terminal LAN address / switcher channel number correspondence table.

FIG. 17 is a configuration diagram of main parts of a network system according to a fourth embodiment of the present invention.

FIG. 18 is a configuration diagram of a connection control device in a fourth embodiment.

FIG. 19 is a configuration diagram of a rough image data / terminal LAN address / switcher channel number correspondence table.

FIG. 20 is a configuration diagram of essential parts of a network system according to a fifth embodiment of the present invention.

FIG. 21 is a configuration diagram of main parts of a network system according to a sixth embodiment of the present invention.

FIG. 22 is a configuration diagram of an exchange according to a sixth embodiment.

FIG. 23 is a configuration diagram of a connection control device in the sixth embodiment.

[Explanation of symbols]

1, 2, 3, 4, 5, 6 ... Network system 101 ... Public network, 102 ... Video telephone device, 103 ... External telephone line, 104 ... LAN, 105 ... Exchange, 106
... extension telephone line, 107 ... videophone device, 108 ... connection control device, 115 ... video / audio switching device, 116, 12
5,134 ... Display, 117,126,135 ...
Camera, 120 ... Terminal A, 121, 130, 139 ... Microphone, 122, 131, 140 ... Speaker

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area H04N 7/14

Claims (7)

[Claims] 1. A public network, a videophone device connected to the public network, an exchange connected to the public network, at least one extension videophone device connected to the exchange, and a television thereof. A connection control device connected to the telephone device by a control line, a LAN to which the exchange and the connection control device are connected, and a plurality of LANs connected to the LAN
Terminals, and video output devices, video input devices, audio output devices, and audio input devices installed in the LAN terminals, and signal lines for the video output devices, video input devices, audio output devices, and audio input devices of each LAN terminal. And a video / audio switching device connected to the extension videophone device by a signal line and connected to the connection control device by a control line, wherein the exchange is a public line. When there is a connection request from a videophone device connected to the network, the transfer destination identifier is acquired by referring to the telephone number / transfer destination identifier correspondence information using the connection destination telephone number as a key, and the transfer destination identifier is an extension TV. When referring to a telephone device, the transfer destination identifier / transfer destination telephone number correspondence information is referenced with the transfer destination identifier as a key to acquire the transfer destination telephone number, and the transfer destination telephone number is acquired. The connection request is transferred to the extension videophone device corresponding to the talk number, and the connection destination telephone number is notified to the connection control device, and the connection control device uses the connection destination telephone number as a key for the telephone number / The terminal LAN address / switcher channel number correspondence information is referred to, the terminal LAN address and the switcher channel number are acquired, a connection request is issued to the LAN terminal of the terminal LAN address via the LAN, and the control line is used to The video / audio switching device is notified of the switcher channel number, and the video / audio switching device connects the signal line from the LAN terminal corresponding to the notified switcher channel number and the signal line from the extension videophone device. However, the extension videophone device is a videophone device connected to the public network in response to a connection request from the videophone device connected to the public network. Which is connected to the public network by receiving the video and audio of the above and sending them to the LAN terminal through the video and audio switching device, and receiving the video and the audio sent from the LAN terminal through the video and audio switching device. A network system characterized by sending to a telephone device. 2. An ISDN network, a videophone device connected to the ISDN network, an exchange connected to the ISDN network, an extension videophone device connected to the exchange, and control to the videophone device. A connection control device connected by lines, a LAN to which the connection control device is connected, a plurality of LAN terminals connected to the LAN, and the LANs
The video output device, the video input device, the audio output device, and the audio input device installed in each terminal are connected to the video output device, the video input device, the audio output device, and the audio input device of each LAN terminal by a signal line. A network system comprising a video / audio switching device connected to the extension videophone device by a signal line and connected to the connection control device by a control line, wherein the exchange is connected to an ISDN network. When a connection request is made from the videophone device, the connection request is transferred to the extension videophone device, the extension videophone device receives the ISDN call setup message, and acquires the subaddress in the call setup message. The sub-address is notified to the connection control device, and the connection control device uses the sub-address as a key for the sub-address / terminal LAN. Dresser / switcher channel number correspondence information to obtain the terminal LAN address and the switcher channel number, issue a connection request to the LAN terminal of the terminal LAN address via LAN, and the switcher via a control line. Notifying the video / audio switching device of the channel number, the video / audio switching device connects the signal line from the LAN terminal corresponding to the notified switcher channel number and the signal line from the videophone device of the extension, The extension videophone device receives video and audio from the videophone device connected to the ISDN network in response to a connection request from the videophone device connected to the ISDN network, and receives the LAN via the video / audio switching device. The video and audio sent from the LAN terminal via the video / audio switching device are received together with I A network system characterized by sending to a videophone device connected to an SDN network. 3. A public network, a videophone device connected to the public network, an exchange connected to the public network, an extension videophone device connected to the exchange, and control to the videophone device. A connection control device connected by lines and signal lines, a LAN to which the connection control device is connected, a plurality of LAN terminals connected to the LAN, and those LANs
The video output device, the video input device, the audio output device, and the audio input device installed in each terminal are connected to the video output device, the video input device, the audio output device, and the audio input device of each LAN terminal by a signal line. A network system comprising a video / audio switching device connected to the extension videophone device by a signal line and connected to the connection control device by a control line, wherein the exchange is connected to a public network. When the connection request is made from the videophone device, the connection request is transferred to the extension videophone device, and the extension videophone device responds to the connection request from the videophone device connected to the public network to the public network. The connection destination identifying audio data from the connected videophone device is received and sent to the connection controlling device, and the connection controlling device transmits the connection destination identifying audio data. As the connection destination identification voice data / terminal LAN address / switcher channel number correspondence information, the terminal LAN address and the switcher channel number are acquired, and a connection request is issued to the LAN terminal of the terminal LAN address via LAN, Further, the switching device channel number is notified to the video / audio switching device via a control line, and the video / audio switching device is connected to the signal line from the LAN terminal corresponding to the notified switching device channel number and the extension videophone. The signal line from the device is connected, and the extension videophone device receives video and audio from the videophone device connected to the public network in response to a connection request from the videophone device connected to the public network. Is sent to the LAN terminal via the video / audio switching device and is also sent from the LAN terminal via the video / audio switching device. A network system characterized by receiving incoming video and audio and sending them to a videophone device connected to a public network. 4. The network system according to claim 3, wherein connection destination identifying image data is used instead of or in addition to the connection destination identifying audio data. Network system. 5. The network system according to any one of claims 1 to 4, wherein the video / audio switching device is a matrix type switching device. 6. The network system according to any one of claims 1 to 4, wherein the video signal and the audio signal output from the video output device and the audio output device are the TV channel numbers assigned to the respective LAN terminals. A TV signal converter for each terminal for converting into a TV signal and a TV signal for each terminal for separating the video signal and the audio signal from the TV signal of the TV channel number assigned to each LAN terminal and inputting them to the video input device and the audio input device A detector is provided in each LAN terminal and is connected to the terminal-specific TV signal converter and the terminal-specific TV signal detector of each LAN terminal by a TV signal line and also connected to the extension videophone device by a signal line. And a shared television signal converter and a shared television signal detector connected to the connection control device by a control line, Used instead of the video / audio switching device, the connection control device notifies the shared television signal converter and the shared television signal detector of the television channel number of the connection destination through the control line, and the shared television signal converter. Converts the video signal and the audio signal passed from the extension video telephone device into a television signal of the notified television channel number and sends out to a television signal line, and the shared television signal detector detects from the television signal line. A network system characterized by receiving a television signal of the notified television channel number, separating a video signal and an audio signal, and passing the video signal and the audio signal to an extension video telephone device. 7. The network system according to claim 1, wherein the video signal and the audio signal output from the video output device and the audio output device are sent to the LAN as packet information, and a LAN is provided. The function of separating the video signal and the audio signal from the packet information received from the device and inputting them to the video input device and the audio input device is provided in each LAN terminal, and the video / audio switching device is omitted, and the extension videophone device is provided. The connection control device is connected to the connection control device by a signal line, and the connection control device sends the video signal and the audio signal passed from the extension videophone device to the LAN as packet information addressed to the LAN terminal of the connection destination, and the LAN transmits the self-control signal. It receives the packet information addressed to it, separates the video and audio signals, and then sends the video and audio signals to the extension TV. Network system, characterized by passing the speech device.