JP3303776B2 - Exchanger for connecting LAN telephone terminal and connection method therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exchange for connecting LAN telephone terminals and a method for connecting the same.
X, which is applied to a private branch exchange, and is connected to a LAN telephone terminal from an extension line, an office line, and a dedicated line accommodated in the PBX, an outgoing connection from the LAN telephone terminal to an extension line, an office line, and a dedicated line. The present invention relates to an exchange that enables interconnection from a LAN telephone terminal to another LAN telephone terminal, and a method of connecting the same. It should be noted that, in this specification, a voice communication function is provided.
LAN with P (Internet Protocol) address
(Local area network) A terminal such as a personal computer connected to a line or the like is called a LAN telephone terminal.

[0002]

2. Description of the Related Art With the spread of the Internet and higher performance of personal computers, a voice call function using a voice codec is provided, and a conventional telephone network is connected via a LAN or a wide area network such as the Internet connected thereto. Similarly, LA that exchanges voice information in real time
N telephone terminals are becoming widespread, and such LANs
Various proposals have been made for connection between a telephone system and a conventional subscriber telephone system.

For example, Japanese Unexamined Patent Publication No. Hei 8-111692 discloses a private branch exchange (hereinafter referred to as a PBX) and a LAN.
A LAN connection control device that is provided between lines and controls connection between a PBX and a LAN telephone terminal is disclosed. FIG. 2 is a block diagram illustrating this prior art, and a PBX 10
In this example, a call arriving at a specific representative number from the extension line 11, the office line 12 connected to the public network 17, and the leased line 13 connected to the leased line network 18 is connected to the LAN connection control device 14,
The connection control device 14 refers to the extension number and IP address correspondence table according to the subaddress included in the outgoing data of the digital telephone and the extension number indicated by the PB (push button) tone which is separately input from the analog telephone. The IP address of the terminal 20 is obtained, the incoming data is converted into predetermined packet data, the IP address is attached to the packet data, and the packet data is transmitted to the LAN line 15 so that the extension 1
1, the local line 12, and the dedicated line 13 from the LAN telephone terminal 20.
Incoming call from the LAN telephone terminal 20 and packetizes outgoing call data and the like with the IP address of the LAN connection control device 14 and sends it out to the LAN line 15. The LAN connection control device 14 By extracting the data and connecting it to the PBX 10, it is possible to make a call from the LAN telephone terminal 20 to the extension 11, the office line 12, or the dedicated line 13.

[0004]

However, in the above-mentioned prior art, since the LAN connection control device 14 is connected to the PBX 10 as an additional device via a line such as a line, a call to the LAN telephone terminal 20 is first connected to the LAN. In order to connect to the control device 14, a specific representative number is set as described above, or P
The BX 10 must have a correspondence table for associating the telephone number of the LAN telephone terminal 20 with the line to which the LAN connection control device 14 is connected, and after connecting to the LAN connection control device 14 based on the correspondence table at the time of incoming connection. , Enter the telephone number of the LAN phone
The data is transferred to the connection control device 14 by the above-described method such as a sub address (extension number), and then the LAN connection control device needs to obtain an IP address from the transferred telephone number of the LAN telephone terminal to perform incoming connection. was there.

That is, LA added separately from the exchange
Since the connection control of the LAN telephone terminal is performed through the N connection control device, it is necessary to have a number conversion table in both the exchange and the connection control device, and the incoming connection processing is performed by both the exchange and the connection control device. However, there are problems of economy, maintainability, and operation time, such as a long processing time.

Also, since connection control of LAN telephone terminals is performed via a LAN connection control device added separately from the exchange, it is not possible to directly manage the call state of each LAN telephone terminal with the exchange. In addition, various additional service functions such as charging management and call forwarding that are generally provided in the PBX cannot be extended to the LAN telephone terminal as it is.

Accordingly, the present invention solves the above-mentioned problems, and performs call control of a LAN telephone terminal directly from an exchange.
In the BX, incoming connections to the LAN telephone terminals from the extensions, office lines and leased lines of the exchange, outgoing connections from the LAN telephone terminals to these extensions, office lines and leased lines, and other L
It is an object of the present invention to provide an exchange which enables LAN telephone terminal interconnection to an AN telephone terminal.

Further, by providing a connection state management memory of the LAN terminal and directly managing the connection state of the LAN telephone terminal, it is possible to identify the busy state of the LAN telephone terminal in a short time, and to realize a known transfer service of the exchange. (E.g., a busy transfer service), a call start time is stored in a connection state management memory, and a call time can be calculated from a time at the end of the call and a call start time, so that traffic calculation and the like can be performed. The same LA is reflected in the charge calculation and by referring to the subnet address from the IP address information registered in the connection state management memory.
Count the number of simultaneous LAN telephone terminals connected to the N line by voice, and if the number exceeds the allowable value predetermined by the system, reject the connection to maintain the quality of the LAN line such as call quality. It is another object of the present invention to provide an exchange which can provide an additional service unique to a LAN telephone terminal to the LAN telephone terminal together with an additional service similar to a general terminal connected to a line line.

[0009]

In order to achieve the above object, an exchange for connecting a LAN telephone terminal according to the present invention comprises:
A line circuit that accommodates a line line connected to a telephone terminal, a trunk circuit that accommodates a trunk line that is connected to another exchange, and a connection between the line circuit and the line line and the trunk line that is connected to the line circuit and the trunk circuit. , And a control device for controlling the line circuit, the trunk circuit, and the switch.
LA connecting an AN (local network) telephone terminal
N LAN line, and the LAN telephone terminal and the control device
A LAN interface circuit for relaying the transmission and reception of a call control packet between the switch, and one or more voice conversion circuits each connected to the switch and connected to the LAN line via a second LAN interface circuit; To convert voice data from the line line or the trunk line connected to the voice conversion circuit into packet data, and convert the converted voice packet.
IP address of the LAN telephone terminal specified by the control device
Out of the second LAN interface circuit from the corresponding LAN telephone terminal.
One or more voice conversion circuits for converting the packet data transmitted with the address into voice data and transmitting the voice data to the voice conversion line to connect the AN telephone terminal to the voice conversion line, A number expansion table for converting a telephone number into a switch number of the switch connected to the line line or the trunk line or an IP address of each LAN telephone terminal connected to the LAN line. When a call request is received via a circuit or the trunk circuit, the number expansion table is referred to by a called telephone number, and if the called telephone number corresponds to any of the LAN telephone terminals, the voice A call including IP address information of a second LAN interface circuit of the voice conversion circuit having an idle line of the conversion circuit. The switch sends the control packet with the IP address of the LAN telephone terminal through the first LAN interface circuit, confirms the response of the LAN telephone terminal, and connects the calling line to the idle line. And controlling the voice conversion circuit so as to make a voice connection between the calling line and the LAN telephone terminal via the LAN line by notifying the voice conversion circuit of the IP address of the LAN telephone terminal. When a call request is received by a call control packet from any of the LAN telephone terminals via the first LAN interface circuit, the number expansion table is referred to by a called telephone number included in the call control packet. If the called telephone number corresponds to either the line line or the trunk line and is connectable, the voice conversion is performed. Responds to the LAN telephone terminal with a call control packet including IP address information of a second LAN interface circuit of the voice conversion circuit having an empty circuit, and connects a line corresponding to the called telephone number to the empty line. Control the switch so as to perform the communication, and notifies the voice conversion circuit of the IP address of the LAN telephone terminal so that the called line and the LA can be connected.
The voice conversion circuit is controlled so that the N telephone terminals are connected by voice via the LAN line.

Therefore, the incoming call can be directly connected to the LAN telephone terminal by referring to the number expansion table in the exchange, and the connection of the LAN telephone terminal is controlled via a separately added LAN connection control device. In addition to shortening the processing time as compared with the technology, maintenance and economic efficiency of the exchange can be improved.

The switch for connecting a LAN telephone terminal according to the present invention further comprises a connection state management memory for managing a connection to the LAN telephone terminal, and the control device transmits the LAN signal from the line line or the trunk line to the LAN line. When a connection request to the telephone terminal is received, and when a connection request from the LAN telephone terminal is received, caller connection information of the call until completion of a call recovery process of the connection request, When the called party connection information, connection status, call start time, and voice conversion circuit are used, the voice conversion line number is stored in the connection status management memory, and the call status from when the call is called to when the call is restored is managed. It is characterized by the following.

[0012] Further, the control device may be arranged such that the connection destination information obtained from the number expansion table based on the called telephone number is the LA.
In the case of the N telephone terminal, the connection destination IP address refers to the caller connection information and the called party connection information in the connection state management memory, and the connection destination IP address is determined by the caller connection information or the called party connection. If registered in the information,
The exchange is controlled so as to transmit a busy tone or a call refusal message to the caller.

Further, the control device manages a control state of the call relating to the LAN telephone terminal, stores a time when a response is detected in a call start time field of the call in the connection state management memory, and recovers the call. When a message or a recovery request is detected, the call time of the call is calculated from the current time and the call start time stored in the connection state management memory, and the call related to the LAN telephone terminal is included by separately storing the call time. It is characterized by enabling traffic calculation and charge calculation.

[0014] Therefore, as with the LAN telephone terminal, the exchange can directly manage the connection state, such as during a busy state, similarly to the terminal directly connected to another switch, so that the connection processing can be performed in a short time. Also, various additional services such as call forwarding can be easily extended to LAN telephone terminals.

Further, when the destination of the outgoing or called connection is the LAN telephone terminal, the control device has the same subnet address as the IP address of the LAN telephone terminal, and controls the caller connection in the connection state management memory. The number of LAN telephone terminals registered in the information and the called party connection information is counted, and if the number is greater than or equal to a predetermined number, a busy tone or a call refusal message is sent to the caller. Controlling the exchange.

This feature is particularly advantageous when the exchange of the present invention is used in a PBX.
Although it is effective when the present invention is applied to such a service, such additional services unique to the LAN telephone terminal can be easily realized.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a LAN according to the present invention.
PBX (Private Branch Exchange) to connect the telephone terminal
2 is a block diagram showing an operation mode when the present invention is applied, and the same reference numerals as those in FIG. The difference from the prior art of FIG. 2 is that the LAN line 1 to which the LAN telephone terminal 20 is connected is connected.
5 is directly connected to the exchange 10 via a plurality of LAN interface circuits described later. In addition,
In FIG. 1, the LAN line 15 is further connected to an IP network through a router 16.

FIG. 3 is a block diagram showing an embodiment of an exchange for connecting a LAN telephone terminal according to the present invention, which includes a line circuit 104 for accommodating an extension 11, a line 12 for connection to a public network 17, A trunk circuit 108 for accommodating the dedicated line 13 connected to the line network 18;
5 and the line circuit 104 and the trunk circuit 1
One or more voice conversion circuits 106 for mutually converting between the voice data format 08 and the voice data format of the LAN telephone terminal;
A switch 103 for exchanging data among the line circuit 104, the trunk circuit 108, and the voice conversion circuit 106, and the line circuit 104 and the trunk circuit 10
And a first LAN interface circuit 10 for transmitting and receiving a call control message between the register 105 for receiving a telephone number from the LAN telephone terminal 5 and the LAN telephone terminal 20 via the LAN line 15.
7, the memory 102, the control bus 101, and the control bus 1
And a CPU (control device) 100 for controlling each of these circuit devices via the control unit 01.

FIG. 4 is a block diagram showing one example of the internal configuration of the voice conversion circuit 106 shown in FIG. 3, and includes a second LAN interface circuit 1063 connected to the LAN line 15,
The voice data format of the LAN telephone terminal and the switch 103 are connected to the second LAN interface circuit 1063.
One or more audio codecs 1064 for mutually converting between audio data formats of other lines connected to the switch, a switch interface 1065 provided in each of the audio codecs 1064, and connected to the switch 103;
An exchange control bus interface 1062 for interfacing with the control bus 101; and a second CPU connected to the second LAN interface circuit 1063 and connected to the control bus 101 via the exchange control bus interface 1062 to control the voice codec 1064
(Control device) 1060 and second memory 1061 used by second CPU 1060.

FIG. 5 is a block diagram showing a configuration example of the LAN telephone terminal 20. The LAN telephone terminal is connected to the LAN line 15 via the LAN interface circuit 203 and is connected to each other via the internal control bus 202.
CPU 200 of LAN telephone terminal, memory 201 of CPU 200, voice control circuit 204 for converting between analog voice and digital voice data, voice control circuit 20
4, a microphone 205 and a speaker 206 connected to
IP of the first LAN interface circuit 107 of the exchange
The call control message is transmitted using the address, and the second LAN interface circuit 1063 of the voice conversion circuit 106 is transmitted.
The voice data packet is transmitted / received using the IP address. The LAN telephone terminal and its communication control are performed by the CPU 200 of the LAN telephone terminal.

The memory 102 shown in FIG.
100, a voice conversion line number-IP address information conversion table 400
And a connection state management memory 500 for the LAN telephone terminal.

FIG. 6 shows an example of the number expansion table 300 provided in the memory 102. With reference to this, the exchange identifies where to connect with the received telephone number as connection destination information. In the example of FIG. 6, 303 is the telephone number 200
0 indicates an extension and is accommodated in the switch of “000101”, and 304 indicates that the telephone number 2001 has the IP address XX. XX. XX. 02 indicates a LAN telephone terminal, 305 indicates that telephone number 81 is accommodated in a switch of 00401 by a dedicated line, and 306 indicates that telephone number 83 is IP
The network address YY. YY. XY. 33 means that the connection is via the IP network via the router 16 in FIG.
It means that it is accommodated in the switch of No. 03001.

FIG. 7 shows an example of the configuration of the voice conversion line number-IP address information conversion table 400 provided in the memory 102. Each of one or more switch interfaces provided in each of the one or more voice conversion circuits 106 is shown. Is set in correspondence with the line number of the switch corresponding to
For example, reference numeral 401 in FIG.
Is the IP address XX. XX. XX. 200
And the four lines up to reference numerals 403 and 404 indicate that one voice conversion circuit 106 has four line numbers and uses the same IP address. are doing.

FIG. 8 shows a LAN provided in the memory 102.
4 shows a configuration example of a connection state management memory 500 of the telephone terminal,
When the exchange expands the telephone number for which the connection request has been received in the number expansion table 300, if the CPU 100 of the exchange determines that the connection is to be made with the LAN telephone terminal, an empty information area in the connection state management memory 500 is reserved and The caller connection information column 501 contains information on the extension, office line, dedicated line or LAN telephone terminal that is the caller, and the called party connection information column 502 contains the extension, office line, dedicated line or LAN telephone that is the called party. The terminal information is stored in the connection status column 505, the state of call processing during a call or a call, the call start time column 505 is the time when the called party answered, and the voice conversion line number column 503 is the LAN telephone terminal. The voice conversion line number of the voice conversion circuit 106 used when connecting to another line through the switch 103 of the exchange is recorded, and the CPU 100 of the exchange makes the LAN telephone terminal 2
0 is managed.

Also, by referring to the subnet address of the IP address of the LAN telephone terminal in the connection state management memory, the maximum number of simultaneous LAN telephone terminals connected to the same LAN line 15 by voice connection is limited, thereby providing the same connection. LAN
It manages so that the traffic of the voice data packet using the line 15 does not exceed the allowable value. In this case, when the CPU 100 of the exchange expands the telephone number of the called or outgoing call and determines that the connection is to the LAN telephone terminal, it refers to the subnet address and refers to the voice in the connection state memory belonging to the same LAN line. The number of connected LAN telephone terminals is counted from the caller connection information and the called party connection information area of the connection state management memory 500, and if the number exceeds the number of connections predetermined by the system, the caller is rejected. For LAN telephone terminals, it sends back a rejection message to the incoming call request, and for an extension, office line or dedicated line, it sends out a busy tone or connects to a guidance talker. The rejection process is performed.

The exchange for connecting the LAN telephone terminal according to the present invention has such a configuration. The exchange receives a connection request from a line line or a trunk line, and stores the telephone number receiving the connection request in a number expansion table 300. If the connection destination information obtained as a result of the expansion is the accommodation position information of an extension, a dedicated line, or an office line, the CPU 100
Performs the same control as before, and connects the calling side and the called side via the switch 103.

On the other hand, the connection destination information obtained as a result of expanding the called party number in the number
Or LA connected to the IP network connected to it
If it is the IP address of the N telephone terminal,
The PU 100 selects an empty line of the audio conversion circuit 106 for converting the audio data format, exchanges a call control packet with the called LAN telephone terminal from the LAN interface circuit 107 via the LAN line 15, and controls the switch 103. By connecting the calling line to the corresponding line of the voice conversion circuit 106, the connection between the calling line and the called LAN telephone terminal is controlled.

The LAN interface circuit 107
Receives a call control packet for a call request from a LAN telephone terminal via the LAN line 15 and expands the called number in the number expansion table 300 to obtain connection destination information of the extension line, dedicated line or office line. In the case of the location information, similarly, the CPU 100 of the exchange selects an empty line of the voice conversion circuit 106, and connects the called line to the relevant line of the voice conversion circuit 106 by the switch 103, so that the calling line Control for connecting the called LAN telephone terminal is performed.

Referring now to the control sequence diagrams shown in FIGS. 3 to 8 and FIGS. 9 to 11 and the flowcharts shown in FIGS. 12 to 15, the LAN telephone terminal of the exchange connecting the LAN telephone terminal of the present embodiment will be described. Each of such operation examples will be described.

First, an example of the operation when the extension 11 is connected to one of the LAN telephone terminals 20 connected to the LAN line 15 will be described with reference to the entire sequence diagram of FIG.
A description will be given with reference to a flowchart showing the operation of the exchange shown in FIG. Note that each control sequence in FIGS. 9 to 11 is assigned the same number as the corresponding flow in the associated flowchart.

The CPU 100 of the exchange detects a call request (off-hook) from the extension by the line circuit 104, connects to the register 105 by a known dial tone connection (call connection) (1200 to 1201), and sets the DT to the extension. (Dial tone) is returned. Extension dials phone number (1
202), the CPU 100 performs the number expansion by referring to the number expansion table 300 provided in the memory 102 (1203), and when the IP address of the called terminal is output as the connection destination information (302) of the called terminal, It is determined that the connection is to the telephone terminal (1204).

Next, in order to identify whether or not the LAN telephone terminal of this IP address is busy, the connection state management memory 5
00 calling party connection information column 501 and called party connection information column 50
2. If the same IP address is not set, it is determined that the connection via the exchange has not been made.
Another LAN with the same subnet address as the address
The number of telephone terminals registered in the connection state management memory 500 is counted from the calling party connection information column 501 and the called party connection information column 502 (1205). If the number is less than the number set in the system, the number of simultaneous connections is allowed. Judge within the value (1
206). Furthermore, selection of a free voice conversion line (1
207).

When an empty circuit is successfully selected (120
8), referring to the voice conversion line number-IP address information conversion table 400, transmitting an incoming request message to the LAN telephone terminal with the IP address of the voice conversion circuit 106 connected to the empty circuit (1209) and receiving the incoming call message; A response message timer (1210) for the request is set, an incoming request response message is received within the timer (1211), and if the contents can be received (121).
2), caller connection information column 5 of connection state management memory 500
01, the called party connection information column 502, and the voice conversion line number column 503 are filled with the data, and the calling status is set in the connection status column 504 of the calling call (1213). Then, a ringing tone (RBT) is transmitted to the calling party (1214), and a response from the called LAN telephone terminal is waited for (1215).

When the called LAN telephone terminal answers, the ringing tone (RBT) is cut off, the switch between the voice conversion circuit and the extension is closed (1216), and the connection state management memory 500
Is updated during the call (1217), and the extension and the LAN telephone terminal enter the call state (1218). The voice data from the calling extension is connected to the voice conversion circuit 106 via the voice conversion line by the switch 103, and is converted by the voice codec 1064 into packet data having the IP address of the called LAN telephone terminal.
The packet data from the called LAN terminal transmitted to the LAN line 15 with the IP address of the voice conversion circuit 106 notified and notified is caught by the second LAN interface circuit 1063 of the voice conversion circuit 106. Is converted to voice data by a voice codec 1064, and is connected to a calling extension by the switch 103 via the switch interface 1065 and the voice conversion line.

In this series of processing, if the connection destination is busy or the number of simultaneous connections is equal to or larger than the allowable value (1206), if there is no vacant circuit of the voice conversion line (1208), the response message to the incoming request message is monitored. If there is no return within the timer (1210, 1212), a known busy tone or talkie connection (1221) is made to the calling extension.

Extension 1 accommodated in line circuit 104
Although the operation from the call request to the telephone call has been described for the connection processing from 1 to the LAN telephone terminal 20, the operation when a connection request is made from a central line or a dedicated line accommodated in the trunk circuit 108 is exactly the same. Omit duplicate descriptions,
Hereinafter, the operation of the exchange from the call to the recovery processing will be described.

FIG. 13 is a flowchart showing the recovery from the state in which a call is monitored by the connection state management memory 500. When a recovery request is received from an extension, office line, dedicated line, or LAN telephone terminal (1302), the other party connected from the calling party connection information column 501 or the called party connection information column 502 of the connection state management memory 500. (1303), read the call start time from the call start time 505 in the connection state management memory 500, calculate the call time based on the current time (at the time of receiving the restoration request), and perform traffic calculation and call charge processing. Hand over (1
304). Then, a recovery message and a recovery process are performed on the connection destination identified above to recover (1305, 130
6) In addition, in the case of connection between the LAN telephone terminal and the extension, office line or leased line, the switch between the voice conversion line and the extension line, office line or leased line is cut off (1308), and the sound conversion line is vacant. (1309), and the corresponding item in the connection state management memory 500 is cleared to make the connection state empty, thereby completing a series of calls.

The restoration request from the extension, the office line or the dedicated line is sent to the line circuit 104 or the trunk circuit 1 respectively.
08, the recovery request from the LAN telephone terminal is sent to the LAN line 15 as a call control packet with the IP address of the first LAN interface circuit 107, and is caught by the first LAN interface circuit 107. Each is received by the CPU 100.

Next, an example of the operation when the LAN telephone terminal 20 is connected to the extension 11, the office line 12, and the dedicated line 13 will be described with reference to a sequence diagram in FIG. 10 and a flowchart in the exchange in FIG. Exchange CPU
100 receives a connection request call control packet transmitted from the LAN telephone terminal 20 with the IP address of the first LAN interface circuit attached thereto through the first LAN interface circuit 107 (1401). With reference to the telephone number included, the number expansion is performed by referring to the number expansion table 300 provided in the memory 102 (1402). As a result, when the connection destination is an extension or the like and the switch accommodation position information is output, the switch to the extension or the like is performed. Connection and judgment (14
03). Next, it is checked whether or not the extension or the like is in a call by means equivalent to a known extension interconnection or the like (1404). If the extension is not available, another LAN telephone terminal having the same subnet address as the IP address is checked. The number of voice connections is counted from the connection state management memory 500. If the number is less than the number set in the system, the number of simultaneous connections is determined to be within an allowable value (1405), and then a voice conversion line is selected (1406).
I do.

If a free voice conversion line is successfully selected (1407), the LAN telephone terminal includes the IP address of the voice conversion circuit 106 obtained from the voice conversion line-IP address conversion table 400 in the connection request response message. It returns the call to the calling LAN telephone terminal (1408), and sets the caller connection information 501, the called party connection information 502, the voice conversion line number 503, and the calling connection state 504 in the connection state management memory 500 (1409). ). And
When the called line answers (1410), the switch between the voice conversion line and the called line is closed (1411), the connection state 504 of the connection state management memory 500 is updated to the state during the call, and the response time is set to the call start time 505. Set to (141
2) Then, similarly to the flow 1218 of FIG.
The N telephone terminal is brought into a talking state (1413).

Note that the process of restoring from the call state follows the restoration process described above with reference to FIG. In this series of processing, if the extension is busy, the number of simultaneous connections in the same LAN segment is equal to or larger than the allowable value (1405), and if there is no free voice conversion line (1407), the calling LAN
First LAN interface circuit 107 to telephone terminal 20
A connection rejection response message is sent to notify that connection is not possible (1416).

Next, when the LAN telephone terminal 20 is connected to the L
About the operation example regarding the case of connecting to the AN telephone terminal,
11 to another LAN telephone terminal 2 in FIG.
1 and in the flow 1403 of the flowchart of FIG.
A description will be given with reference to the flowchart of FIG. 15 showing control of the exchange when it is determined that the connection is between the AN telephone terminals. The CPU 100 of the exchange receives the connection request message of the LAN telephone terminal from the first LAN interface circuit 107, and, based on the telephone number included in the message,
If the IP address of the LAN telephone terminal is output as a result of expanding the number expansion table 300 provided in the memory 102 (1403, 1501), it is recognized that the LAN telephone terminal is interconnected. Then, the caller connection information 501 and the callee connection information 502 in the connection state management memory 500 are searched for the IP addresses of the called LAN telephone terminal 21 and the calling LAN telephone terminal 20, and the same IP address is not set. And the I and I of the calling and called LAN telephone terminal.
LAN having the same subnet address as the P address and registered as a voice connection in the connection state management memory 500
The number of telephone terminals is counted, and if the number is less than the allowable value set in the system, the number of simultaneous connections is determined to be within the allowable value (1502, 15).
03), and transmits an incoming request message to the called LAN telephone terminal 21 (1504), sets a response message timer (1505) for the incoming request, and receives a response message to the incoming request within the timer (1506). And if a call can be received (1507),
Caller connection information 501, called party connection information 502, and a ringing connection state 504 are set in the connection state management memory 500 (1508). Then, a positive message for the connection request including the IP address of the called party is returned to the LAN telephone terminal of the calling party (1509), and a response is waited for.

After confirming the response (1510), the connection state 504 of the connection state management memory 500 is updated during the call and the call start time 505 is set (1511), and the state in which the LAN telephone terminals are talking (1512). To The voice data is transmitted to the calling and called LAN telephone terminal by the I
It is transmitted and received directly between LAN telephone terminals by the P address.
Note that recovery from during a call follows the flow chart of the call recovery process in FIG. In these series of processes,
The connection destination is busy or the number of simultaneous connections exceeds the allowable value (150
3) Also, when no response message to the incoming request message is returned within the monitoring timer (1503), and when a response message for rejecting the incoming call is received (1503).
7) sends (1515) a rejection message for the connection request to the calling LAN telephone terminal to notify that connection is not possible.

Although the embodiment of the exchange for connecting a LAN telephone terminal according to the present invention has been described mainly with respect to an example of application to a PBX, the application of the present invention is not limited to this. The present invention can also be applied to a subscriber line switch that accommodates a subscriber telephone line and accommodates a trunk line in the trunk circuit 108. In this case, as the LAN telephone terminals to be connected, individual LAN telephone terminals connected to the IP network via the router 16 and given subscriber telephone numbers are assumed, for example, via a high-speed line. It is also possible to perform the above-described traffic management with all the LAN telephone terminals connected to a specific LAN line as subscribers.

[0045]

According to the present invention, the CPU of the exchange is LA
By directly performing the call control with the N telephone terminal, the connection operation with the LAN telephone terminal connected to the LAN line becomes possible in the same manner as the processing operation of the exchange for the normal terminal directly connected to the line line. Various services via LAN
It can be provided to telephone terminals. Also, since it is not a dedicated additional device, it is possible to economically accommodate a LAN telephone terminal, and since the processing is performed only by the exchange, the connection processing time is short, and the maintenance of the exchange is facilitated. Can be.

[Brief description of the drawings]

FIG. 1 shows an exchange for connecting a LAN telephone according to the present invention to P
It is a block diagram which shows the example of operation at the time of applying to BX.

FIG. 2 is a block diagram illustrating a LAN connection control device according to the related art.

FIG. 3 is a block diagram showing a configuration example of an embodiment of an exchange for connecting a LAN telephone according to the present invention.

FIG. 4 is a block diagram illustrating a configuration example of a voice conversion circuit 106 in FIG. 3;

FIG. 5 is a block diagram illustrating a configuration example of a LAN telephone terminal.

FIG. 6 is a conceptual diagram showing a configuration of a number expansion table provided in a memory 102 of FIG. 3;

FIG. 7 is a conceptual diagram showing a configuration of a voice conversion circuit number-IP address conversion table provided in a memory 102 of FIG. 3;

8 is a conceptual diagram showing a configuration of data stored in a connection state management memory of the LAN telephone terminal provided in the memory 102 of FIG.

FIG. 9 is a sequence diagram showing a control sequence when connecting from an extension to a LAN telephone terminal in the operation mode of FIG. 1;

FIG. 10 is a sequence diagram showing a control sequence when connecting from a LAN telephone terminal to an extension or the like in the operation mode of FIG. 1;

11 is a sequence diagram showing a control sequence at the time of connection between LAN telephone terminals in the operation mode of FIG. 1;

12 is a flowchart showing the operation of the exchange 10 of FIG. 1 when connecting from an extension to a LAN telephone terminal.

FIG. 13 is a flowchart showing an operation of a recovery process of the exchange 10 of FIG. 1;

FIG. 14 is a flowchart showing an operation of the exchange 10 of FIG. 1 when connecting from a LAN telephone terminal to an extension.

FIG. 15 is a flowchart showing an operation of the exchange 10 of FIG. 1 at the time of connection between LAN telephone terminals.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 switch 11 extension line 12 office line 13 dedicated line 14 connection control device 15 LAN line 16 router 17 public network 18 dedicated line network 19 IP network 20 LAN telephone terminal 100, 200, 1060 CPU 101, 202 control bus 102, 1061 memory 103 Switch 104 Line circuit 105 Register 106 Voice conversion circuit 107, 203, 1063 LAN interface circuit 108 Trunk circuit 1062 Switch control bus interface 1064 Voice codec 1065 Switch interface 204 Voice control circuit 205 Microphone 206 Speaker 300 Number expansion table 400 Voice conversion line number IP address conversion table 500 Connection state management memory

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 3/00 H04L 12/28 H04L 12/46 H04L 12/66 H04M 11/00-11/10 H04Q 3/58 101- 107

Claims (12)

(57) [Claims] 1. A line circuit for accommodating a line line connected to a telephone terminal, a trunk circuit for accommodating a trunk line connected to another exchange, and a line circuit connected to the line circuit and the trunk circuit and between line lines and between line lines. And a switch for connecting the line circuit, the trunk circuit and the switch, and a control device for controlling the line circuit, the trunk circuit and the switch.
A LAN interface circuit connected to an AN line for relaying transmission and reception of a call control packet between the LAN telephone terminal and the control device; and a switch and the LAN line connected to the switch and the respective voice data formats mutually. A voice conversion circuit for converting, when the line device or the trunk circuit is connected to the LAN telephone terminal, the control device transmits and receives call connection control information via the LAN interface circuit; or the voice conversion circuit and the trunk lines to ensure communication path connected with said switch, its
The audio information converted by the audio conversion circuit of
An exchange for connecting a LAN telephone terminal, which transmits and receives data via a LAN interface circuit of a road . 2. The control apparatus according to claim 1, further comprising a number expansion table for expanding the input called telephone number to determine a connection destination, and connecting destination information of a called telephone number to be connected to the line line or the trunk line. Is an IP (Internet Protocol) address of a LAN telephone terminal, selects an empty line of the voice conversion circuit, and transmits call connection control information including an IP address of the voice conversion circuit having the selected empty line to the LAN interface. 2. The LAN telephone according to claim 1, wherein a call is transmitted to said LAN telephone terminal via a circuit, a response of said LAN telephone terminal is confirmed, and a calling side and said empty line are connected via said switch. An exchange that connects terminals. 3. A line circuit for accommodating a line line connected to a telephone terminal, a trunk circuit for accommodating a trunk line connected to another exchange, a line circuit connected to the line circuit and the trunk circuit, and between and between line lines. And a switch for connecting the line circuit, the trunk circuit and the switch, and a control device for controlling the line circuit, the trunk circuit and the switch.
Connect to the AN line, a LAN interface circuit that relays transmission and reception of call control packets between said control unit and the LAN telephone terminal, with the second, respectively are connected to the switch by one or more audio converter The switch converts voice data from the line line or the trunk line, which is connected to the LAN line via a LAN interface circuit and is connected to the voice conversion circuit by the switch, into packet data, and converts the converted voice packet into the packet data. The control device is a finger
The LAN address with the IP address of the LAN telephone terminal to be set.
The AN telephone by transmitting packet data to the line, converting packet data transmitted from the corresponding LAN telephone terminal with the IP address of the second LAN interface circuit into voice data, and transmitting the voice data to the voice conversion line. One or more voice conversion circuits for voice-connecting a terminal to the voice conversion line; and a switch number or the LAN of the switch for connecting a telephone number to the line line or the trunk line.
And a number expansion table for converting the IP address of each LAN telephone terminal connected to the line to an IP address. The control device, when receiving a call request via the line circuit or the trunk circuit, Referring to the number expansion table, if the called telephone number corresponds to any of the LAN telephone terminals, the IP address of the second LAN interface circuit of the voice conversion circuit having an empty line of the voice conversion circuit. The call control packet containing the IP address of the LAN telephone terminal is added to the first LA
Sending out via the N interface circuit, confirming the response of the LAN telephone terminal, controlling the switch so as to connect the calling line to the empty line, and transmitting the IP address of the LAN telephone terminal to the voice conversion circuit. Notify the calling line and the LAN telephone terminal to the LAN
Controlling the voice conversion circuit so as to make a voice connection via a line, and controlling the LA through the first LAN interface circuit
When a call request is received by a call control packet from any of the N telephone terminals, the number expansion table is referred to by the called telephone number included in the call control packet, and the called telephone number is If any one of the trunk lines can be connected to the LAN telephone terminal, the call control packet including the IP address information of the second LAN interface circuit of the voice conversion circuit having an empty line of the voice conversion circuit is used. And controls the switch to connect the line corresponding to the called telephone number to the empty line,
An exchange for connecting a LAN telephone terminal, wherein the voice conversion circuit is controlled so as to make a voice connection between the called line and the LAN telephone terminal via the LAN line by notifying an IP address of the telephone terminal. 4. The exchange for connecting a LAN telephone terminal according to claim 3, wherein the control device originates a call by a call control packet from any of the LAN telephone terminals via the first LAN interface circuit. When the request is received, the number expansion table is referred to by the called telephone number included in the call control packet, and if the called telephone number corresponds to any other of the LAN telephone terminals and connection is possible, By responding to the calling LAN telephone terminal with a call control packet including the IP address information of the called LAN telephone terminal,
An exchange for connecting a LAN telephone terminal, wherein the telephone terminal and the called LAN telephone terminal are directly connected by voice via the LAN line. 5. The exchange for connecting a LAN telephone terminal according to claim 4, further comprising a connection state management memory for managing connection to the LAN telephone terminal, wherein the control device is configured to control the line line or the trunk line. Receiving a connection request to the LAN telephone terminal from the server, and receiving a connection request from the LAN telephone terminal, until the call recovery processing of the connection request is completed. Connection information, called party connection information, connection status, call start time, and when using a voice conversion circuit, the voice conversion line number is stored in the connection status management memory, and the call status until the call is recovered from the call is restored. An exchange for connecting LAN telephone terminals, wherein 6. The exchange for connecting a LAN telephone terminal according to claim 5, wherein the control device is configured such that, when connection destination information obtained from the number expansion table by a called telephone number is the LAN telephone terminal,
The connection destination IP address is registered in the caller connection information or the called party connection information by referring to the caller connection information and the called party connection information of the connection state management memory. An exchange for connecting a LAN telephone terminal, wherein the exchange is controlled so as to send a busy tone or a call refusal message to the caller. 7. The exchange for connecting a LAN telephone terminal according to claim 5, wherein the control device manages a control state of a call related to the LAN telephone terminal, and sets a time at which a response is detected to the connection state. Stored in the call start time field of the call in the management memory, when a recovery message or a recovery request is detected, calculate the talk time of the call from the time at that time and the call start time stored in the connection state management memory, LA that is capable of calculating traffic and charges including calls related to the LAN telephone terminal by storing separately.
An exchange that connects N telephone terminals. 8. The exchange for connecting a LAN telephone terminal according to claim 5, wherein the control device, when the destination of the outgoing or called call is the LAN telephone terminal, the same subnet as the IP address of the LAN telephone terminal. It has an address, counts the number of LAN telephone terminals registered in the caller connection information and the called party connection information in the connection state management memory, and if the number is equal to or greater than a predetermined number, the call is made. An exchange for connecting a LAN telephone terminal, wherein the exchange is controlled so as to transmit a busy tone or a call refusal message to a caller. 9. A LAN interface circuit for connecting a LAN telephone terminal to a LAN line for connection and relaying call control information transmitted to and received from the LAN telephone terminal; Having an audio conversion circuit for mutually converting audio data formats
A method of connecting an exchange for connecting N telephone terminals, wherein a call request is received by a line circuit or a trunk circuit, and an input called telephone number is developed to connect the called telephone number to the LAN telephone terminal. Identifying the IP address of the voice conversion circuit; selecting an empty line of the voice conversion circuit to identify the IP address of the voice conversion circuit; and call connection control including the IP address of the voice conversion circuit. Transmitting and receiving information to and from the LAN telephone terminal via the LAN interface circuit; and receiving a response from the LAN telephone terminal to connect a calling side to the empty line of the voice conversion circuit via the switch. A connection method for an exchange for connecting a LAN telephone terminal. 10. A LAN interface circuit for connecting a LAN telephone terminal to a LAN line for connection and relaying call control information transmitted to and received from the LAN telephone terminal; Provided with an audio conversion circuit for mutually converting audio data formats
A connection method of an exchange for connecting an AN telephone terminal, wherein the LAN interface circuit receives call connection control information from the LAN telephone terminal via the LAN line, expands a called telephone number, and expands a called telephone number. Identifying the connection destination information as a switch number connected to a trunk line or a line line; selecting an empty line of the voice conversion circuit to identify an IP address of the voice conversion circuit; Transmitting and receiving call connection control information including the IP address of the voice conversion circuit to and from the LAN telephone terminal via the LAN interface circuit; and receiving a response from the called side and receiving the response from the called side and the voice conversion circuit. Connecting the empty line via the switch. 11. A first LAN interface circuit that connects to a LAN line connecting a LAN telephone terminal and relays call control information transmitted to and received from the LAN telephone terminal;
A connection method for an exchange for connecting a LAN telephone terminal comprising a switch and a voice conversion circuit for mutually converting voice data formats between the switches and the LAN line, wherein a call is originated from a line line or a trunk line. When a request is detected, a step of connecting a switch to the line or trunk line to receive a called telephone number, and referring to a number expansion table, a switch number corresponding to the called telephone number or an IP of a LAN telephone terminal. Acquiring the address as a called connection destination; and, when the called connection destination is the IP address of the LAN telephone terminal, referring to the connection state management memory and referring to the called LA.
A step of checking whether or not the N telephone terminal is busy, and if not, further checking whether or not there is an empty voice conversion line; and a step of confirming whether the called LAN telephone terminal is not busy. And when there is an empty line of the voice conversion line, the empty line is used as the voice conversion line of the call, and the call control packet including the IP address information of the voice conversion circuit having the voice conversion line is transmitted to the first LAN. Sending from the interface circuit to the called LAN telephone terminal via a LAN line;
After confirming that a call control packet of a possible call response from the telephone terminal has been received, the caller connection information, the callee connection information, the connection state, and the voice conversion line number of the call are recorded in the state management memory. And confirming the response of the called LAN telephone terminal, connecting the calling line to the voice conversion line, and checking the IP address of the called LAN telephone terminal.
An address is notified to the voice conversion circuit, and the voice conversion circuit converts voice data from the calling line connected to the voice conversion line into packet data, and notifies the IP address of the notified LAN telephone terminal. Add the address to the LA
The called LAN telephone terminal by transmitting packet data to the N-line, converting packet data transmitted from the called LAN telephone terminal with the IP address of the voice conversion circuit to voice data, and transmitting the voice data to the voice conversion line. A voice call to the calling line, and a step of erasing the data of the call in the state management memory upon completion of the restoration processing of the call. Switch connection method to be used. 12. A first LAN interface circuit that connects to a LAN line connecting a LAN telephone terminal and relays call control information transmitted to and received from the LAN telephone terminal;
A method of connecting an exchange for connecting a LAN telephone terminal comprising a switch and a voice conversion circuit for mutually converting voice data formats between the switches and the LAN line, wherein the switch is connected via the first LAN interface circuit. Extracting a called telephone number from the calling request packet when a calling request packet from the LAN telephone terminal is received, and referring to a number expansion table, a switch number or LAN corresponding to the called telephone number. Acquiring the IP address of the telephone terminal as a called connection destination; and, if the called connection destination is a switch number connected to a line or a trunk line, determining whether the called line is busy. Checking and, if not in a call, further confirming whether or not there is an empty voice conversion line, and And if there is an empty line of the voice conversion line, the empty line is used as the voice conversion line of the call, and the call control packet including the IP address information of the voice conversion circuit having the voice conversion line is transmitted to the call control packet. First L
An AN interface circuit sends the called LAN telephone terminal via the LAN line to the called LAN telephone terminal to acknowledge the connection, and also stores caller connection information, called party connection information, connection state, and voice conversion of the call in the state management memory. Recording a line number, confirming the response of the called line, connecting the voice conversion line to the called line, and notifying the voice conversion circuit of the IP address of the calling LAN telephone terminal to the voice conversion circuit; A circuit for converting voice data from the called line connected to the voice conversion line into packet data, attaching the notified IP address of the calling LAN telephone terminal to the LAN,
The calling LAN telephone terminal is transmitted to the line, the packet data transmitted from the calling LAN telephone terminal with the IP address of the voice conversion circuit is converted into voice data, and the voice data is transmitted to the voice conversion line. Connecting a LAN telephone terminal, comprising: a voice communication step of making a voice connection to the called line; and a step of erasing the data of the call in the state management memory upon completion of the restoration processing of the call. How to connect the exchange.