KR20030041616A - PBX or Key-Phone using H.323 protocol - Google Patents

Abstract

PURPOSE: A private exchange and a key phone system which use an H.323 protocol are provided to give an Internet phone function through an existing ordinary phone, so that a user selects an Internet phone function or an ordinary phone function with the ordinary phone. CONSTITUTION: A phone interface unit(1-2) connected to an existing in-plant phone exchanges signals with the in-plant phone. A LAN(Local Area Network) interface unit(1-3) transmits signals transmitted from a protocol converter(1-1-2) of a CPU(1-1) to a hub, a router, an ADSL(Asymmetric Digital Subscriber Line) modem or a cable modem, and transmits signals transmitted from the Internet through the hub, the router, the ADSL modem or the cable modem to the protocol converter(1-1-2). An office line interface unit(1-4) connected to an office line exchanges signals with a telephone office. And the CPU(1-1) composed of an exchange unit(1-1-1) and the protocol converter(1-1-2) provides an exchange function and a protocol conversion function.

Description

Private exchange and key phone system using H.323 protocol {PBX or Key-Phone using H.323 protocol}

Existing private exchanges have had to pay expensive long distance and international calls for external calls.

Recently, with the expansion of the Internet, Internet phones have appeared, which can be used very cheaply for long distance calls and international calls.

However, to use an Internet phone, an expensive Internet phone had to be purchased instead of an existing phone, and in particular, a company using a large number of phones had to be very expensive to replace an existing phone with an Internet phone.

This Internet private exchange or key phone system is composed of telephone interface unit, LAN interface unit, trunk line interface unit, and central processing unit so that the user can use the Internet telephone function with a conventional general telephone. It is a device to select and use the phone or landline function.

1 is an overall system diagram according to an embodiment of the present invention.

2 is a flowchart in the case of origination from an extension telephone according to an embodiment of the present invention.

3 is a flowchart in the case of reception from the external Internet according to an embodiment of the present invention.

As a technical means for achieving the above object of the present invention, the present invention provides a telephone interface unit for connecting an existing local telephone, a LAN interface unit for connecting to the Internet, a trunk line interface unit for connecting to a trunk line, an exchange function and a protocol It consists of a central processing unit with a conversion function.

1 is an overall system diagram according to an embodiment of the present invention.

2 is a flowchart in the case of origination from an extension telephone according to an embodiment of the present invention.

3 is a flowchart in the case of reception from the external Internet according to an embodiment of the present invention.

The system configuration of the present invention will be described with reference to FIG.

This private exchange is a telephone interface unit (1-2) for connecting an existing local telephone, a LAN interface unit (1-3) for connecting to the Internet, a trunk line interface unit (1-4) for connecting to a trunk line, and a switching function. And a central processing unit 1-1 having a protocol conversion function.

The telephone interface unit 1-2 is connected to the existing premises telephone and serves to send and receive signals.

The LAN interface unit 1-3 transmits the signal transmitted from the protocol conversion unit of the central processing unit to the hub / router / ADSL modem / cable modem, etc., and transmits it from the Internet through the hub / router / ADSL modem / cable modem. It sends a signal to the protocol converter.

The trunk line interface unit (1-4) is connected to the trunk line (telephone station telephone line) and serves to send and receive signals with the telephone station.

The central processing unit 1-1 is further divided into an exchange unit and a protocol conversion unit according to a role.

The exchange unit 1-1-1 of the central processing unit functions as follows.

First, determine the connection target according to the input signal from the premises telephone.

In case of connecting by private telephone or trunk line, establish connection and send / receive signal according to the same procedure and method as existing private exchange.

When connecting to the Internet, it establishes a connection to the protocol conversion unit, and after the connection is established, plays a role of transmitting and receiving a signal along the path set between the extension telephone and the protocol conversion unit.

Second, handle connection request from outside.

In the case of a connection from a CO line, the connection is established and transmitted / received to the corresponding local telephone according to the same procedure and method as the existing private exchange.

When a connection request is received from the protocol conversion unit, the connection is established to the corresponding extension telephone, and after the connection is established, the signal is transmitted and received along the path set between the extension telephone and the protocol conversion unit.

The protocol conversion unit 1-1-2 of the central processing unit plays the following roles between the exchange unit and the server of the external Internet telephone service company.

First, when a connection request is received from the exchange, that is, when the user wants to connect to the outside via the Internet from the premises telephone, he receives the premises telephone number from the exchange and obtains the Internet telephone identification number from the premises telephone number. Establish a connection with the telephone server and connect with the other party's Internet telephone or regular telephone through the Internet telephone server.

Second, when the connection request is received from the Internet phone server, the Internet phone identification number is received from the transmitted data, the extension telephone number is obtained from the Internet phone identification number, and the connection is established with the exchange unit. .

After establishing the third connection, the signal from the local telephone is converted into Internet data by applying the H.323 protocol, and then transmitted to the Internet telephone server through the Internet, and the data transmitted from the Internet telephone server through the Internet is converted into a telephone signal. Transfer it to the local telephone via the exchange.

The flow in the case of an outgoing call from the premises telephone will be described with reference to Fig. 2 as an example.

For the purpose of explanation, if the first button is '0', Internet phone, if it is '9', general external phone, and others are in-house phone are as follows.

In the first step, the handset of the premises telephone is connected to the exchange via the telephone interface unit. (2-1)

In the second step, if the first button is '0', the process proceeds to the third step (2-3), otherwise the process proceeds to the ninth step. (2-11)

In the third step, the exchange establishes a connection to the protocol converter. (2-3)

In the fourth step, the protocol conversion unit receives the extension telephone number from the switching unit. (2-4)

Step 5, an Internet telephone identification number is obtained from the telephone number of the premises (2-5), and a connection with a preset Internet telephone server is established through the Internet. (2-6)

Step 6, when the user presses the other person's Internet phone or general phone number (2-7), as in the existing Internet phone, the protocol conversion unit transmits the other party's phone number to the Internet phone server and connects with the other party's phone through the Internet phone server. Set. (2-8)

Step 7, After the connection is established, the signal received from the local telephone is converted into Internet data by applying the H.323 protocol and then transmitted to the Internet telephone server, and the data transmitted from the Internet telephone server is converted into a telephone signal Send by phone. (2-9)

In the eighth step, when the handset is dropped or the connection is released from the other party, the connection between the local telephone and the switching unit, the switching unit and the protocol conversion unit, the protocol conversion unit and the Internet phone server is released. (2-10)

In the ninth step, when the first button is '9' like the existing private exchange, it connects to the trunk line (2-12), otherwise it connects to the local telephone (2-15) and transmits and receives a signal in the same manner. .

When a connection request is received from an external internet phone or a regular phone through a trunk line, the connection is made to the corresponding local telephone by the same procedure and method as the existing private exchange, and the signal is transmitted and received.

A case where a user wants to connect to an internal telephone from an external internet phone via the Internet will be described with reference to FIG.

In this case, the local telephone acts as an internet telephone.

In the first step, when a connection request is received from an external Internet telephone server (3-1), the protocol conversion unit obtains the Internet telephone identification number from the received data (3-2), and establishes a connection with the Internet telephone server. 3-3)

In the second step, the protocol conversion unit obtains the internal extension telephone number from the Internet telephone identification number. (3-4)

Step 3, the protocol conversion unit establishes a connection to the exchange. (3-5)

Step 4, the exchange establishes a connection with the internal telephone by using the internal internal telephone number transmitted from the protocol conversion unit. (3-6)

In the fifth step, after the connection is established, the signal received from the local telephone is converted into Internet data by applying the H.323 protocol, and then transmitted to the Internet telephone server, and the data transmitted from the Internet telephone server is converted into a telephone signal. Send by phone. (3-7)

Step 6, when the telephone hangs up or disconnects from the other party, disconnects the connection between the local telephone and the switching unit, the switching unit and the protocol conversion unit, the protocol conversion unit and the Internet phone server. (3-8)

The above invention can be equally applicable to not only a private exchange but also a key phone system, and can be used by connecting all devices using a conventional telephone line, such as a telephone as well as a telephone.

In addition, the above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.

When using a private exchange or a key phone system according to the present invention, there is a difference depending on the Internet phone service provider, but due to the Internet phone function, it is possible to make free calls between Internet phones and use intercity and international calls at low cost. You can use internet phone or regular phone function conveniently with a regular phone.

Claims (5)

In a private exchange or key phone system Telephone interface section for connecting the extension telephone LAN interface unit for internet access CO line interface section for connecting to CO lines Private exchange or keyphone system, characterized in that composed of a central processing unit having a switching function and protocol conversion function According to the above 1 Private exchange or keyphone system, characterized in that it automatically switches the connection to the extension or trunk line or the Internet according to the user's choice According to the above 1 A private exchange or key phone that detects a connection request from an external Internet phone server or a connection request from a trunk line and automatically switches the internal phone to be used as an Internet phone or a regular phone. According to the above 1 Private exchange or key phone system, characterized in that the Internet telephone identification number is obtained from the telephone number when there is a connection request from the telephone. According to the above 1 Private exchange or key phone system characterized in that the telephone number is obtained from the Internet telephone identification number when there is a connection request from an external internet telephone server.