KR100271960B1 - Internet telephony interface apparatus - Google Patents

Abstract

PURPOSE: A device for connecting an Internet phone is provided to interlink a private exchange with the Internet, to enable an extension subscriber of the private exchange to perform telephone speech through the Internet. CONSTITUTION: A flash memory(120) enabling remote program stores operating programs and data according to operations, and preserves the stored data even in a power-off state. A DRAM(Dynamic RAM,130) temporarily stores inputted/outputted signaling data and voice data. A line connector(110) converts voice signals inputted from a private exchange into PCMed(Pulse Code Modulated) voice data for outputting, and converts the PCMed voice data into voice signals for transmission to the private exchange. An engine unit(140) generates a clock signal and a frame synchronizing signal for extracting the PCMed voice data transmitted from the line connector(110), and detects/generates a DTMF(Dual Tone Multi Frequency) and an R2 signal. A low-speed CODEC(150) receives the PCM voice data through a PCM bus, and converts the transmitted PCM voice data into low-speed voice data in a vocoding system in real time. And the low-speed CODEC(150) receives pure voice data for conversion into PCMed voice data, and transmits the converted voice data to the line connector(110). An MPU(Main Processor Unit,160) reads the voice data converted in the low-speed CODEC(150) to convert the read voice data into voice packet data corresponding to an Internet transmission protocol, and reads inputted voice packet data to extract pure voice data to transmit the pure voice data to the low-speed CODEC(150). And an Internet connector(170) transmits the voice packet data converted in the MPU(160) to the Internet, and receives low-speed voice packet data from the Internet.

Description

Internet dialup device {INTERNET TELEPHONY INTERFACE APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an Internet dial-up device, and more particularly, to an Internet dial-up device in which an extension subscriber of a private exchange performs a telephone call over the Internet.

The Internet is a network of networks, and is currently composed of computer networks that connect the world. The Internet is capable of transmitting information between various networks having various technologies and devices by using a promised protocol (TCP / IP), and has an openness and compatibility, and subscribers are increasing exponentially. Various communication services are implemented or implemented based on the Internet, because the Internet has a foundation to transmit various information.

Due to the above-mentioned characteristics of the Internet, various communication services are being implemented. In particular, a service for transmitting voice in real time using the Internet has been in the spotlight recently. An example of such a voice transmission service is an Internet phone service. Internet phone service is a technology that enables telephone calls through the Internet network, rather than through a separate telecommunication service provider's communication line. The Internet phone service is developed through the development of voice processing technology and interworking technology with the general telephone network. In addition to a connected computer, ordinary telephone users can use the Internet to make international or long-distance calls. This is an Internet service that is expected to increase sharply in the future because it brings the advantages of using international calls and long distance calls to general users with only Internet usage fees.

On the other hand, as the Internet phone service is activated, it is expected to be used in conjunction with terminal devices subscribed to the existing general telephone network, among which, interworking services with private exchanges used in general companies or offices will be more and more spotlighted. . This is because the private exchanges are mainly used for business facilities, because the use of international calls or long-distance calls often increases the burden of telephone call charges, which is a driving force to solve this problem. In addition, since private exchanges have a large number of extension subscribers, if each extension subscriber performs a voice service through the Internet, that is, a telephone call, the benefits derived from it will be immeasurable.

However, in the conventional private exchange, there has been no interworking with the Internet, and there is a problem in that it is limited. Moreover, there was a problem in that telephone calls through the Internet were not performed for each of the extension subscribers subscribed to the aforementioned private exchange.

Accordingly, an object of the present invention is to implement an Internet telephone connection apparatus in which a private exchange and an internet are interworked so that an extension subscriber of the private exchange performs a telephone call through the Internet.

In addition, the present invention can implement the Internet phone service through the extension subscribed to the private exchange, to solve the problem of excessive cost caused by international calls and long distance calls.

In order to achieve the above object, the present invention is connected to a private exchange, the line connection unit for converting the input voice signal into pulse code modulated voice data, and the pulse code modulated voice data transmitted from the line connection pulse code A low speed codec unit which is transmitted through a modulation (PCM) bus, converts the received voice data into low speed voice data in real time, and reads the voice data converted by the low speed codec unit into voice packet data corresponding to Internet transmission protocol. The present invention proposes an Internet telephone access device having a control unit for converting and an Internet access unit for transmitting the converted voice packet data to the Internet.

1 is a system diagram showing the formation of a telephone call via the Internet in a private exchange according to an embodiment of the present invention.

2 is a block diagram of an Internet telephone access apparatus according to the present invention;

3 is a block diagram of a line connection unit according to a first embodiment of the Internet telephone access apparatus of FIG. 2;

4 is a block diagram of a line connection unit according to a second embodiment of the Internet telephone access apparatus of FIG. 2;

FIG. 5 is a block diagram of an Internet access unit according to an embodiment of the Internet telephony access device of FIG. 2; FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

On the other hand, in the following description of the present invention, when it is determined that detailed descriptions of related well-known functions or constructions may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted, and generally customary in constructing the present invention. Components and functions used as such will be omitted. The terms to be described below are terms defined in consideration of functions in the present invention, and may be changed according to the intention or custom of the user or chip designer, and the definitions should be made based on the contents throughout the present specification.

1 is a system diagram showing the formation of a telephone call via the Internet in a private exchange according to an embodiment of the present invention.

Referring to FIG. 1, the first extension 10, which is an extension subscriber of the first private exchange 20, makes an extension connection to a port connected to the first Internet telephony connection device 30. In addition, an area code and an extension number are reported to the first Internet telephone access device 30 through a dual tone modulation frequency (DTMF) or an R2 signal through a channel set when the port is connected. Then, the first Internet dial-up device 30 allocates a voice channel with the second Internet dial-up device 50 through the Internet 40. When the first Internet telephone access device 30 and the second Internet access device 50 and a channel are allocated, the first Internet phone access device 30 transmits call information to the second Internet phone access device 50, and the first Internet telephone access device 50 is assigned to the channel. A channel is established between the second extension 70, the subscriber selected by extension 10, and the second Internet dial-up device 50.

In conclusion, the first extension 10 and the second extension 70 through the first private exchange 20, the first internet dial-up device 30, the Internet 40, the second internet dial-up device 50, and the second private switch 60 are connected. A communication channel is formed.

On the other hand, the first extension 10 or the second extension 70 is connected to the subscriber card (SLC) 11 implemented in the private exchange 20 and 60, the first Internet dial-up device 30 and the second Internet dial-up device 50 Matched with the analog or digital circuit portion of the subscriber portion 21 of the private exchange 20,60.

The Internet telephone access devices 30 and 50 will now be described with reference to the accompanying drawings.

First, Figure 2 shows a block diagram of the Internet telephone access device 30, 50 according to the present invention.

Referring to FIG. 2, the line connection unit 110 is implemented as a general subscriber loop circuit or a digital trunk circuit, is connected to a subscriber unit of a private exchange, and converts an input voice signal into a pulse code modulation (PCM). The line connection unit 110 satisfies the T1 method, which is a North American digital trunk, and the E1 method, which is a European digital trunk, and is matched with an analog circuit unit.

The general subscriber loop circuit of the line connection unit 110 is shown in FIG.

3 is an internal block diagram of a line connection unit according to the first embodiment of the Internet telephone access apparatus of FIG.

Referring to FIG. 3, a ring detector and a terminator 111 are connected to an analog circuit unit implemented in a subscriber unit of a private exchange and detect a ring signal and a voice signal output from the analog circuit unit. The hybrid circuit unit 112 hybridly encodes and outputs the audio signal detected by the ring detector and the terminator 111. The codec 113 receives the hybrid coded speech signal output from the hybrid circuit unit 112, pulses code modulation (PCM), and transmits the same through the PCM bus 115.

On the other hand, the ring detector, the terminal 111 and the codec 113 is connected to the control unit 160 and the control unit bus 165 of the Internet telephony connection device, and transmits and receives the control and data of the control unit 160.

In addition, the digital trunk circuit of the line connection unit 110 is shown in FIG.

4 is an internal block diagram of the line connection unit 110 according to the second embodiment of the Internet telephone access apparatus of FIG.

Referring to FIG. 4, the line transceiver 116 satisfies the T1 and E1 schemes with the digital circuit unit of the subscriber unit of the private exchange and performs digital matching. The line controller and the HDLC controller 117 transmit and receive data with the line transceiver, and convert the received data into data according to the HDLC protocol to output to the PCM bus 115 or HDLC input through the PCM bus 115 to comply with ISDN protocol. Performs the operation of converting and outputting data according to the protocol.

On the other hand, the line transceiver 116 is set to the synchronization clock path 118 and the engine unit 140 of the Internet dial-up device through a clock (Clock) line. That is, a synchronization clock is transmitted to the Internet telephony device to allow data transmitted from the private exchange through the clock path 118 to be processed in real time by the Internet telephony device. The line controller and the HDLC controller 117 are connected to the control unit 160 through a control unit bus 165 to transmit and receive control signals and data of the control unit 160.

Again, with reference to FIG. 2, an Internet telephone access apparatus according to the present invention will be described.

The flash memory 120 is a memory for storing an operation program of the Internet dial-up device and various data thereof. The flash memory 120 preserves the stored contents even when the power supply to the Internet telephone access device is interrupted, and enables remote programming. The DRAM 130 is a nonvolatile memory, and temporarily stores data corresponding to various signaling message data and voice signals transmitted / received to the Internet telephone connection device, and operates a memory for storing various data required for the program of the Internet telephone connection device to operate. Do this. That is, it becomes an operation memory of the Internet telephone connection station. The controller 160 functions as a microprocessor (MPU) of the Internet dial-up device, which controls the overall operation. The engine unit 140 extracts a clock signal and a frame synchronization signal for extracting voice data output from the line connection unit 110, and also detects or generates a DTMF signal or an R2 signal. The PCM-converted voice data at the line connection unit 110 is input to the low speed codec unit 150 via the PCM bus 115. The low speed codec unit 150 converts the received PCM-converted voice data into low speed voice data of a specific VOCODING method in real time. In other words, as voice data is transmitted through the Internet, data is compressed to enable real-time calls. The voice data converted by the low speed codec unit 150 is transmitted to the control unit 160 through the control unit bus (MPU BUS) 165. In this case, the controller 160 reads the voice data converted by the low speed codec unit 150 and converts the voice data into a packet form suitable for Internet transmission, and transmits it to the Internet access unit 170. The Internet access unit 170 is connected to the Internet to perform the transmission and reception of substantial data with the Internet. Meanwhile, voice data in the form of packets transmitted through the Internet access unit 170 is read by the control unit 160, and then only pure audio data is extracted. The control unit transmits the low speed codec unit 150 via the bus 165. Then, PCM conversion in the low speed codec unit 150 is transmitted to the line connection unit 110 through the PCM bus 115, and then transmitted to the private exchange again.

On the other hand, the low-speed codec unit 150 converts the PCM-converted signal into an encoded signal using a method that is pre-defined in several standardized vocoding schemes, and converts the converted coded signal into the pre-contracted scheme. It is equipped with a digital signal processor (DSP) that processes the conversion into PCM signals. This is to allow a two-way call and a real-time call to be performed, such as a phone call.

On the other hand, the Internet connection unit 170 is an Ethernet (Ethernet) connection is implemented. An internal block configuration of the Internet access unit 170 will be described with reference to FIG. 5.

FIG. 5 is a block diagram illustrating an internal connection of the Internet access unit according to the embodiment of the Internet telephone access apparatus of FIG. 2.

Referring to FIG. 5, the Ethernet access controller 171 performs an operation of being connected to the controller 160. The line encoder 172 transmits and receives a control signal and data to and from the Ethernet access controller 171, and performs an operation of encoding the transmitted and received data in a predetermined manner. On the other hand, in the embodiment of the present invention, the line encoder 172 is implemented as a Manchester line encoder for encoding by the MANCHESTER encoding method. The Ethernet connection unit 173 connects the line encoder 172 with Ethernet. In an embodiment of the present invention, a circuit unit in which the Ethernet connection unit 173 is connected to Ethernet through 10BASET174 or a circuit unit connected to Ethernet through an attachment unit interface (AUI) 175 is implemented.

In FIG. 2, the RS-232C connection unit 180 enables monitoring of the Internet telephony connection device and program change through an external terminal or a computer. This is a configuration for facilitating wide expansion and program change of the Internet dial-up apparatus according to the present invention. The AC / DC converter converts external AC power into DC power to supply the final power of the Internet telephone connection device.

For reference, in the implementation of the present invention, the software is configured to support the international protocol TCP / IP kernel or TCP / IP protocol according to the Internet communication, and to comply with the H.323 communication standard of the International Telecommunication Union (ITU). . The ITU-H.323 communication standard is a standard for the transmission of multimedia information, which has a relatively good sound quality and has the advantage of being able to communicate with other Internet network users who adopt the ITU standard, which is a common protocol. Also, in the hardware implementation, when the apparatus is connected to a network connected to the Internet network using a local area network (LAN), the 802 committee of the Institute of Electrical and Electronic Engineers (IEEE) The standardization of the lower two layers of the standardized ISO (Open System Interconnection model) reference model of the International Organization for Standardization (ISO) reference model, that is, the physical layer and the data link layer, must be satisfied. An example of this is a network card, a cable, and a router.

As described above, since the present invention provides an interface through the Internet in any private exchange period, international telephone calls or long distance calls between extension subscribers subscribed to each private exchange bring an advantage of low cost.

In addition, since the Internet dial-up device according to the present invention uses a flash memory therein, it is possible to download a remote program, which has the advantage of enabling error correction or upgrade of a program through the Internet.

In addition, the Internet telephony connection device according to the present invention has an advantage that it can be installed and used regardless of any kind of exchange because it is possible to connect digitally through digital trunk circuit as well as analog connection through subscriber loop circuit in line connection. .

Claims (12)

In the Internet telephone connection device, An operation program and data according to the operation are stored, the stored data is preserved even when the power is turned off, and a remote programmable flash memory; A volatile memory for temporarily storing various signaling data and voice data input and output; A line connection unit connected to a private exchange, for converting a voice signal input from the private exchange into pulse code-modulated voice data and outputting the voice signal, converting the pulse code-modulated voice data into a voice signal and transmitting the voice signal to the private exchange; An engine unit for generating a clock signal and a frame synchronizing signal for extracting pulse-coded modulated voice data transmitted from the line connection unit, and detecting and generating a complex redundancy signal (DTMF) and an alto (R2) signal; Receives pulse code modulated voice data transmitted from the line connection unit through a pulse code modulated bus (PCM) bus, converts the received voice data into low-speed voice data of a certain vocoding scheme in real time, and converts pure voice data A low speed codec unit for converting the voice data into pulse code-modulated voice data and transmitting the converted voice data to the line connection unit; It controls the overall operation of the Internet dial-up device, reads the voice data converted by the low speed codec unit to convert the voice packet data corresponding to the Internet transmission protocol, reads the input voice packet data and extracts the pure voice data. A control unit for transmitting to a low speed codec unit, And an internet access unit for transmitting the converted voice packet data to the internet and receiving low speed voice packet data from the internet. The method of claim 1, The low speed codec unit, Converting a pulse coded modulated signal into a coded signal using a predetermined method among several standardized vocoding methods, and converting the converted coded signal into a pulse coded modulated signal through the predetermined method A device comprising a digital signal processing processor for processing an operation in real time. The method of claim 1, The Internet telephone connection device, And an RS-232C connection for enabling monitoring of the Internet dial-up device and modification of a program via an external terminal. The method of claim 1, The Internet connection unit is characterized in that the 10Mbps Ethernet connection is implemented. The method of claim 4, wherein The internet connection unit, An Ethernet connection controller connected to the control unit, And a line encoder for inputting and outputting control signals and data to and from the Ethernet access controller and encoding the input and output data in a predetermined manner. Device comprising an Ethernet connection for connecting the line encoder with Ethernet. The method of claim 5, The line encoder is, Apparatus characterized in that implemented by the Manchester line coder encoded by the Manchester coding scheme. The method of claim 5, The Ethernet connection portion, Device characterized by consisting of an Ethernet connection that is connected to the Ethernet through 10BASET. The method of claim 6, The Ethernet connection portion, And an Ethernet connection for accessing the Ethernet via the AUI interface. The method of claim 1, The line connecting portion, A ring detector and a termination unit connected to an analog circuit unit of a subscriber connection unit of the private exchange by using a general subscriber loop circuit implemented as an analog circuit, and detecting a ring signal and an audio signal output from the analog circuit unit; A hybrid circuit unit for hybridly encoding and transmitting the voice signals detected by the ring detector and the terminal unit; And a codec for receiving a voice signal transmitted from the hybrid circuit unit and modulating a pulse code and then transmitting the pulse code through a pulse code modulation (PCM) bus. The method of claim 9, And the ring detector, the terminator, and the codec are connected to the controller through a controller bus. The method of claim 1, The line connecting portion, A digital circuit part of the subscriber connection part of the private exchange using a digital trunk circuit implemented by a digital circuit, a line transceiver that satisfies T1 and E1 methods and is connected by digital matching; In order to comply with the ISDN protocol, the device comprising a line controller and HDLC controller that receives the data from the line transceiver converts the data according to the HDLC protocol and outputs the pulse code modulation (PCM) bus. The method of claim 11, And the line transceiver has a clock path set in synchronization with the engine through a clock line, and the line controller and the HDLC controller are bus-connected with the controller through a controller bus.

Images