JPH10308777A - Voice exchange system for local area network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a procedure and a function concerning the communication of terminal and electronic exchange by converting the protocols of call control signals from the main control parts of terminal and electronic exchange and performing the format transformation of voice data with both the main switches. SOLUTION: A call control converting part 9 of LAN subscriber circuit 8 connected with a terminal B converts the protocol to be used for a call originate signal on a LAN 6. The call control converting part 9 adds an identifier for specifying the communication of the port number or the like of transmission control protocol or user diaphragm protocol to be used for exchanging the voice data between a terminal A or B and a format transforming part 13 to a connect signal, draws an address to be used for the terminal B on the LAN 6 from an address correspondence table 11 and sends the connect signal to the terminal B while using this address. Then, both terminals 7 send the voice data to a voice data converting part 10 while using the identifier specifying the communication, and its disconnection is performed through protocol conversion or the like by the call control converting part 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching system for a local area network (hereinafter referred to as LAN) terminal, and more particularly to a voice switching system for a terminal connected to a LAN and having a voice communication function.

[0002]

2. Description of the Related Art An example of a conventional LAN terminal switching system is disclosed in Japanese Patent Laid-Open No. 60-53359 and Japanese Patent Laid-Open No. 1-103-103.
050, JP-A-8-223224, JP-A-60-74900, JP-A-61-253952, JP-A-63-193630, JP-A-63-193630
This is disclosed in JP-A-222538, JP-A-2-13198 and JP-A-3-14536. These gazettes use electronic exchanges that perform circuit switching on LANs,
It has a protocol conversion and address conversion function related to connection to connect with terminals connected to a packet communication network, etc., and realizes connection between heterogeneous terminals to enable user data communication between terminals. I have.

In Japanese Patent Application Laid-Open No. 3-261243, in addition to the functions described in the above-mentioned publication, when the attributes of the user data of the terminals do not match, the connection between different types of terminals is realized after converting the user data into a standard protocol in the exchange. I have.

[0004]

The first problem is that the above-mentioned Japanese Patent Application Laid-Open No. 60-53359 and Japanese Patent Application Laid-Open No.
050, JP-A-8-223224, JP-A-60-74900, JP-A-61-253952, JP-A-63-193630, JP-A-63-193630
In the LAN terminal switching systems described in JP-A-222538, JP-A-2-13198, and JP-A-3-14536, connection is possible if terminal attributes such as voice data encoding are different between terminals. However, there is a disadvantage that communication cannot be actually performed.

[0005] The reason is that even if the connection between the terminals is implemented by performing protocol conversion and address conversion of a portion related to the connection between the terminals, the consistency of the user data does not match between the terminals.

[0006] The second problem is that the above-mentioned Japanese Patent Application Laid-Open No. 3-26 is disclosed.
No. 1243 has a drawback that the exchange or the terminal has terminal attribute information such as encoding of user data, and it is necessary to check the consistency of the terminal attribute at the time of connection.

The reason is that when the terminal attributes match, a transparent communication path is provided between the terminals, and protocol conversion is performed only when the terminal attributes do not match.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a terminal having a voice communication function connected to a LAN for communication with a general subscriber's telephone or another LAN terminal, transfer of an electronic exchange, and three-way communication. LAN that simplifies procedures and functions related to communication between terminals and electronic exchanges in services
It is to provide a voice exchange system for a terminal.

[0009]

According to the present invention, there is provided a voice exchange system having a local area network, a local area network, a terminal having a voice communication function connected to the local area network, and a LAN accommodating a line of the terminal. A subscriber circuit, a subscriber circuit for accommodating a line of a general subscriber telephone, a main switch for circuit switching of voice data, a main control unit for call control, and a transfer and a three-way telephone service. An electronic exchange including a service trunk for transmitting a tone and mixing voice;
A call control signal conversion means included in the AN subscriber circuit and performing protocol conversion of a call control signal between the terminal and the main control unit of the electronic exchange; and a call control signal conversion means included in the LAN subscriber circuit and connecting the terminal and the main switch of the electronic exchange. There is audio data conversion means for converting the format of audio data.

The terminal has call control means for transmitting and receiving a call control signal to a predetermined LAN subscriber circuit, regardless of whether the other end of communication is a general subscriber telephone or a terminal. Also, it has communication means for transmitting / receiving voice data to / from a LAN subscriber circuit specified by a call control signal, regardless of whether the communication partner terminal is a general party telephone or a terminal.

The communication of voice data on the local area network between the LAN subscriber circuit and the terminal is carried out from the start of communication to the end of communication by communication such as a port number of a transmission control protocol (TCP) or a user diagram protocol (UDP). Service means for transferring the electronic exchange without changing the identifier for specifying the service and for providing a three-party call service.

Further, the call control signal conversion means is provided with the LA of the terminal.
It has a correspondence table of N addresses and addresses recognizable by the main control unit.

Further, when the communication is started, the voice data conversion means performs TCP or UDP defined by the electronic exchange.
A format conversion unit that communicates with the terminal using an identifier for specifying communication such as a port number of the communication until disconnection and converts the format of voice data, and a service provided by the electronic exchange received during communication of the terminal. The terminal further has a switch interface for changing the connection with the time slot of the main switch specified by the main control unit in accordance with the state. Regardless of whether the terminal is a general subscriber telephone or a terminal, the terminal has calling means for making a call using a number recognizable by the main control unit of the electronic exchange.

In short, in the present system, a terminal having a voice communication function connected to a LAN has only a predetermined connection destination of a call control signal to a LAN subscriber circuit of an electronic exchange. By continuing transmission and reception from the electronic exchange to the designated connection destination at the time of the start, regardless of whether the communication partner is a general subscriber telephone or a terminal connected to the LAN, an attempt is made to use the service provided by the exchange during communication. Communication is always possible,
Procedures and functions related to communication can be simplified.

In the present system, the electronic exchange includes:
A terminal having a voice communication function connected to the LAN
In order to limit the format of the voice data used above and to always convert it to the voice data format in the exchange, judge and process whether to exchange the voice data format according to the partner terminal even if the service is used during communication There is no need to make any changes, and the service can be provided using only the service functions of the conventional electronic exchange.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an electronic exchange accommodating a terminal having a voice communication function connected to a LAN. As shown in the figure, an electronic exchange 1 in a voice exchange system for LAN terminals according to the present invention includes a main switch 2 for performing circuit switching of voice data, a main control section 3 for performing call control, transfer and three-way communication. And the like, and has a service trunk 4 for transmitting tones and mixing voices for use in implementing services such as services, and has a voice communication function connected to a subscriber circuit 14 accommodating the line of the general subscriber telephone 5 and the LAN 6. It has a LAN subscriber circuit 8 for accommodating the line of the terminal 7. The LAN subscriber circuit 8 is a LAN subscriber circuit.
A call control signal converter 9 for performing protocol conversion between a call control signal relating to a voice connection used on the LAN 6 and a call control signal used in the electronic exchange, voice data used on the LAN 6 and used by the main switch 2 And a voice data converter for transmitting and receiving voice data to and from a time slot of the main switch 2 designated by the main controller 3. Further, the call control signal conversion unit 9 has an address correspondence table 11 for associating addresses used on the LAN 6 of the terminal 7 with numbers that can be processed by the main control unit 3. The switch interface 12 transmits and receives audio data to and from the time slot of the main switch 2 designated by the above. The format converter 13 converts the format of the audio data used on the LAN 6 and the audio data used by the main switch 2. Consists of

Here, the procedure of voice exchange with the terminal 7 by the electronic exchange 1 will be described with reference to FIG. When a terminal A on the LAN initiates a voice call with another terminal B on the LAN, the main control unit 3 sends a call signal including a terminal number of the identifiable partner to the predetermined LAN subscriber circuit 8. It is sent to the call control signal converter 9. The call control signal conversion unit 9 converts the received call signal into a protocol that can be processed by the main control unit 3 and sends it to the main control unit 3. The main control unit 3 transmits the LAN subscriber circuit 8 to which the terminal B is connected. Outgoing call signal to the call control conversion unit 9 of FIG. LA to which terminal B is connected
The call control converter 9 of the N subscriber circuit 8 transmits the call signal to the LAN 6
In addition to the conversion into the protocol used above, the address used on the LAN 6 of the terminal B is extracted from the address correspondence table 11, and a call signal is transmitted to the terminal B using the extracted address. Next, the response signal to the call signal of the terminal B is the LA to which the terminal B is connected.
After being sent to the call control converter 9 of the N subscriber circuit 8 and subjected to protocol conversion, it is sent to the main controller 3. Upon receiving the response signal, the main control unit 3 controls both LAN subscriber circuits 8
The switch interface 12 designates the time slot number of the main switch 2 used for communication, instructs connection, and sends a connection signal to both call control conversion units 9. The call control conversion unit 9 is used for transmitting and receiving voice data between the terminal A or B and the format conversion unit 13.
An identifier for specifying communication such as a port number of CP or UDP is added to the connection signal, an address used on the LAN 6 of the terminal B is extracted from the address correspondence table 11, and the extracted address is used. And sends a connection signal to terminal B. Both terminals 7 transmit audio data to the audio data conversion unit 10 using an identifier for specifying communication such as a TCP or UDP port number specified by the connection signal. Similarly, the disconnection signal is implemented by performing protocol conversion and the like in the call control signal conversion unit 9.

Next, referring to FIGS. 3 to 7, even if the service provided by the electronic exchange 1 is used during communication,
From the start to the end of the communication, the communication is performed without changing identifiers for specifying communication such as TCP or UDP port numbers used for transmission / reception of audio data between the terminal 7 and the format converter 13 of the audio data converter 10. Explain what is possible. First, actually, the main control unit 3 exchanges a call control signal between the main control unit 3 and the terminal 7 or the general subscriber telephone 5 for the first time.
Although the time slot of the main switch 2 to be connected to 2 is determined and a connection instruction is performed, the operation is the same as that of the conventional electronic exchange, so that the exchange of the call control signal will be omitted. Time slot A is voice transmitted from terminal A, time slot B is voice transmitted from terminal B, time slot C is voice transmitted from a general subscriber's telephone, and time slot E is transmitted from service trunk 4. The hold tone and the time slot F are used for a ring tone transmitted from the service trunk 4, and the time slot G is used for a mixed voice after synthesizing voices on a plurality of time slots in the service trunk. .

First, it is assumed that communication is performed between the terminal A and a general subscriber telephone. According to FIG. 3, the voice from the terminal A to the general subscriber's telephone is transmitted via the time slot A at this time. On the other hand, voice from the general subscriber telephone to terminal A is communicated via time slot C.

At this time, it is assumed that the transfer is performed from the general subscriber telephone to the terminal B. According to FIG. 4, at this time, the terminal A receives the hold tone via the time slot E, but the terminal A and the format converter 13 of the audio data converter 10
Or UDP used for sending and receiving voice data
It is not necessary to change an identifier such as a port number for specifying communication.

Next, it is assumed that the terminal B responds to the transfer. According to FIG. 5, the voice from terminal A to terminal B is communicated via time slot A at this time. On the other hand, voice from terminal B to terminal A is communicated via time slot B. Similarly, it is not necessary to change an identifier for specifying communication such as a TCP or UDP port number used for transmission and reception of audio data between the terminal A and the format converter 13 of the audio data converter 10.

Next, it is assumed that the terminal B attempts to make a three-party call including a general subscriber's telephone. According to FIG. 6, terminal A receives the hold tone via time slot E, and terminal B receives the ring tone via time slot F since it calls a general subscriber's telephone. According to FIG. 7, after answering the general subscriber telephone, the voices transmitted from the terminal A, the terminal B and the general subscriber telephone are received by the service trunk via the time slots A, B and C, respectively, and after the voice synthesis, the mixing is performed. It is transmitted to the time slot G as voice. The received voice or data of all terminals during the three-way call is the mixing voice on this time slot G. As described above, even when the service is used, the communication for specifying the communication such as the TCP or UDP port number used for the transmission and reception of the audio data by the terminal 7 and the format conversion unit 13 of the audio data conversion unit 10 determined at the start of the communication. There is no need to change the identifier.

It is natural that the service of the electronic exchange is not limited to the transfer and the three-party call.

[0025]

According to the present invention, a terminal connected to a LAN can connect a call control signal only to a LAN subscriber circuit of an electronic exchange, regardless of whether the communication destination is a general subscriber telephone or a LAN terminal. When a service provided by the exchange during communication is used, communication can be performed without changing an identifier such as a TCP or UDP port number, and the procedure and functions related to communication can be simplified.

Further, according to the present invention, it is possible to provide the service of the conventional electronic exchange without determining whether or not to perform the format conversion of the voice data according to the conventional partner terminal and without changing the processing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a voice exchange system for LAN terminals according to the present invention.

FIG. 2 is a sequence diagram showing a communication procedure including a call control signal between the LAN terminal and the electronic exchange in FIG.

FIG. 3 is an explanatory diagram showing connection of voice data during communication between a terminal and a general subscriber telephone.

FIG. 4 is an explanatory diagram showing a connection in a standby state for receiving a hold tone of a terminal when a transfer is performed from a general subscriber telephone.

FIG. 5 is an explanatory diagram showing connection of audio data during communication between terminals.

FIG. 6 is an explanatory diagram showing connection in a state of waiting for a hold tone and a ring tone when a three-party call including a general subscriber's phone is requested from a terminal.

FIG. 7 is an explanatory diagram showing connection of audio data during a three-party call from the state of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic exchange 2 Main switch 3 Main control part 4 Service trunk 5 General subscriber telephone 6 LAN 7 Terminal 8 LAN subscriber circuit 9 Call control signal conversion part 10 Voice data conversion part 11 Address correspondence table 12 Switch interface 13 Format conversion part 14 Subscriber circuit

──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. ⁶ Identification code FI H04Q 3/545

Claims (7)

[Claims] 1. A local area network, a terminal having a voice communication function connected to the local area network, a LAN subscriber circuit accommodating a line of the terminal, and a subscriber accommodating a general subscriber telephone line An electronic exchange including a circuit, a main switch for performing circuit switching of voice data, a main control unit for performing call control, and a service trunk for performing tone transmission and voice mixing for use in transferring and performing a three-party call service. A call control signal conversion means included in the LAN subscriber circuit, for performing protocol conversion of a call control signal between the terminal and the main control unit of the electronic exchange; and a call control signal conversion means included in the LAN subscriber circuit, A local area network terminal having voice data conversion means for converting the format of voice data with the main switch of the electronic exchange; Voice switching system. 2. A call control means for transmitting and receiving a call control signal to and from a predetermined LAN subscriber circuit, regardless of whether the terminal with which the terminal communicates is a general subscriber telephone or the terminal. The voice exchange system for a local area network terminal according to claim 1, further comprising: 3. The terminal transmits / receives voice data to / from the LAN subscriber circuit specified by a call control signal, regardless of whether the terminal to communicate with is a general attendant telephone or the terminal. 2. The voice exchange system for a local area network terminal according to claim 1, further comprising communication means. 4. The communication of voice data on a local area network between the LAN subscriber circuit and the terminal is for specifying communication such as a port number of a transmission control protocol or a user diagram protocol from the start of communication to the end of communication. 2. A voice exchange system for a local area network terminal according to claim 1, further comprising service means for performing a transfer of said electronic exchange and a three-party call service without changing said identifier. 5. The voice exchange system for a local area network terminal according to claim 1, wherein said call control signal conversion means has a correspondence table of a LAN address of said terminal and an address recognizable by said main control unit. 6. The voice data conversion means uses an identifier for specifying communication such as a transmission control protocol or a user diagram protocol port number determined by the electronic exchange at the time of starting communication, until the time of disconnection. A format conversion unit that communicates with a terminal and converts the format of voice data, and a time slot of a main switch designated by the main control unit according to a state of a service provided by the electronic exchange received during communication of the terminal. 2. The voice switching system according to claim 1, further comprising a switch interface for changing a connection. 7. When the terminal performs voice communication, the main control unit of the electronic exchange is used as an identification number used to specify an unconnected end, regardless of whether the connection destination terminal is a general subscriber telephone or the terminal. 2. The voice exchange system for a local area network terminal according to claim 1, further comprising calling means for making a call using a number recognizable by the terminal.