KR100296399B1 - InternetPhone Gateway System - Google Patents

Abstract

The present invention relates to an internet phone gateway system, and more particularly, to an internet phone gateway system capable of providing real-time communication such as a telephone or a fax by interworking with the Internet in an exchange system using a PCM (Pulse Coded Modulation) highway.

Conventionally, the concept of Internet phone service cannot be applied to a switching system, and thus, a subscriber connected to the switching system must communicate via a public telephone network to communicate using a telephone or a fax machine.

The present invention provides an Internet phone gateway system which performs a process of compressing PCM voice / fax data of a switching system using a PCM highway into voice / fax data in a packet form used on the Internet or vice versa. In the long distance voice / fax communication can provide a real-time service over the Internet, thereby reducing the communication fee.

Description

Internet Phone Gateway System

The present invention relates to an internet phone gateway system, and more particularly, to an internet phone gateway system capable of providing real-time communication such as a telephone or a fax by interworking with the Internet in an exchange system using a PCM (Pulse Coded Modulation) highway.

In general, an Internet phone refers to a real-time voice conversation between PC (Personal Computer) users through the Internet, and the demand is gradually increasing due to low communication rates, and PC to PC, It is divided into PC-to-phone and telephone-to-phone systems. To date, many developments have been made on PC-to-PC and PC-to-phone systems.

On the other hand, the PC-to-PC method is a method of connecting a PC and a PC to transmit and receive voice through a microphone and a speaker, and both sides connect to the Internet at the same time, and then use an identical program to mutually input analog voices. When the signal is digitized and compressed, the packetized voice is sent to the other party's PC through the Internet, and the PC restores the packetized voice and outputs it through the speaker so that the call can be made at the same time. Had to be connected to the Internet and use the same program.

In addition, the PC-to-telephone method installs a program on a corresponding PC and connects to the Internet, and then communicates with a public telephone network using a telephone through an Internet phone gateway system installed in a specific area. There was a limitation to link the public telephone network.

In addition to the above-mentioned voice call using a telephone or a PC, there are similar restrictions on fax communication using a fax.

On the other hand, a schematic network configuration for telephone or fax communication in a conventional private branch exchange system is shown in the accompanying drawings, Figure 1, the extension subscriber of the premises switching system is an extension of the telephone or fax If you want to use the terminal to communicate with subscriber terminals of other local switching system or national exchange system, you must pay the communication fee to the public network operator because it must be linked with the public communication network. The farther away, the more expensive the communication fee.

As described above, when the subscriber connected to the exchange system does not apply the concept of the Internet phone service to the switching system and wants to communicate using a telephone or a fax, it must be via a public telephone network. There was a disadvantage of being expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is a process of compressing PCM voice / fax data of a switching system using a PCM highway into voice / fax data in a packet form used on the Internet, or vice versa. The present invention provides an internet phone gateway system that performs the above, and saves a communication fee during long distance voice / fax communication in the corresponding switching system.

1 is a schematic network configuration for telephone or fax communication of a conventional switching system.

2 is a diagram illustrating a schematic network configuration for telephone or fax communication of an exchange system using an Internet phone gateway system according to the present invention;

3 is a block diagram of the Internet phone gateway system according to the present invention in FIG. 2;

4 is a detailed block diagram of the Internet call processing unit in FIG. 3;

5 is a detailed block diagram of the message connection unit in FIG. 3;

Explanation of symbols on the main parts of the drawings

10: monitoring unit 20: Internet connection

30 control unit 31 Internet call processing unit

31-1: Voltage Regulator 31-2: Risk Processor

31-3: reset circuit part 31-4: initialization buffer

31-5: Buffer 31-6: Memory

32: control circuit part 40: system connection part

41: PCM highway connection 42: message connection

42-1: message bus controller 42-1a: memory arbiter

42-1b: Slave Controller 42-2: Local SRAM

50: voice processing unit 51 to 58: vocoder

A feature of the present invention for achieving the above object is an Internet connection for connecting the Internet by providing an interface between the exchange system and the Internet; A system connection for performing PCM highway connection and message bus connection of the switching system; A voice processing unit for compressing the PCM voice / fax data into a packet form or reconstructing the compressed packet / voice data into PCM voice / fax data; A control unit for controlling the operation of the Internet connection unit, the system connection unit, and the voice processing unit and performing Internet call processing, and connecting an external operator terminal through an RS-232 port in connection with the control unit to control the internal state of the Internet phone gateway system. It further includes a monitoring unit for maintaining and managing.

Here, the system connection unit is connected to the PCM highway of the switching system according to the synchronization clock provided from the control unit PCM highway connection for transmitting and receiving PCM voice / fax data; The message connection unit further includes a message connection unit for transmitting and receiving a call control message related to an Internet phone service by connecting to a message bus of the switching system, wherein the message connection unit serves as a master and masters itself as a slave, and controls the message bus. A message bus controller for activating; The apparatus may further include a local SRAM for temporarily storing the call control message.

The control unit may further include: an internet call processing unit performing an internet call processing function between the switching system and the Internet by executing a program necessary for operating an Internet phone service; A control circuit unit for generating a device control signal for controlling the system connection unit and the voice processing unit, and matching the PCM highway timing of the switching system with the PCM timing of the system connection unit and the voice processing unit, wherein the internet call processing unit A memory unit for storing Internet phone service related programs and data; A risk processor for controlling the operation of the entire Internet phone gateway system by using an Internet phone service related program and data stored in the memory unit; A buffer that performs a matching function between the risk processor and the memory unit; An initialization buffer for storing initialization data of the risk processor for determining an initial operation mode; A voltage regulator supplied with an exchange system power to provide operating power for the risk processor; It further comprises a reset circuit for performing a reset function.

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

A schematic network configuration for telephone or fax communication of an exchange system using an Internet phone gateway system according to the present invention is shown in FIG. 2. That is, the subscriber station connected to the switching system performs real time communication such as a telephone or a fax by interworking with the Internet by the Internet phone gateway system.

In this case, the Internet phone gateway system includes a monitoring unit 10, an Internet connection unit 20, a control unit 30, a system connection unit 40 and a voice processing unit 50 as shown in FIG. do.

The monitoring unit 10 connects an external operator terminal through a RS-232 (Recommended Standard-232) port and simultaneously interworks with the Internet call processing unit 31 of the control unit 30 to monitor the state inside the corresponding Internet phone gateway system. Ensure maintenance and management.

The Internet connection unit 20 is connected to the Internet call processing unit 31 of the control unit 30 for the Internet phone service through the Internet Ethernet protocol for the interface between the exchange system and the Internet, IEEE 802.3 protocol and ARP (Address Resolution Protocol, Address resolution protocol).

The control unit 30 is composed of the Internet call processing unit 31 and the control circuit unit 32, and controls the overall operation of the Internet phone gateway system and performs the Internet call processing, etc. The Internet call processing unit 31 is the Internet phone It executes the program necessary for service operation to perform internet call processing function between exchange system and internet. The control circuit unit 32 is implemented as an EPLD (Eraseble Programmable Logic Device) to generate a device control signal for controlling each device in the Internet phone gateway system, the PCM highway timing of the switching system and each device, that is, the Internet call processing unit A timing matching function for matching the 31 with the PCM timing of the voice processing unit 50 is performed.

The system connection portion 40 is composed of a PCM highway connection portion 41 and a message connection portion 42, and performs the PCM highway connection and the message bus (X-BUS) connection of the switching system for Internet phone service, the PCM highway The connection part 41 connects with the PCM highway of the switching system according to the synchronous clock provided from the control circuit part 32 to transmit and receive PCM voice / fax data, and the corresponding message connection part 42 is connected to the message bus of the switching system to Send and receive call control messages with the switching system excluding PCM voice / fax data.

The speech processing unit 50 is composed of a plurality of vocoders (Vocoders 51 to 58), and compresses or compresses the compressed / compressed PCM coded voice / fax data into voice / fax data in a predetermined packet form for transmission over the Internet. Restores voice / fax data in the form of PCM voice / fax data, wherein the PCM voice / fax data is 64 Kbps, and the packet / voice data is 5.3 Kbps, 6.3 Kbps, and 8 Kbps. Supports G.723 and G.729 Recommendations for Compression or Restoration.H.323, Real Time Transfer Protocol (RTP / RTCP) for real-time transmission of voice / fax data and PCM voice / fax data in compressed packet form. / Real Time Control Protocol) protocol.

Here, H.323 is a protocol for providing real-time multimedia communication, the H.225 protocol used to set up call setup between terminals, the H.245 protocol used to send and receive call control messages, and the real-time voice / RTP protocol used for transmitting video data and RTCP protocol used for reporting service for media information transmitted through RTP.

Since each vocoder 51 to 58 can process four channels of PCM voice / fax data, eight vocoders 51 to 58 are used to process 32 channel PCM highways of the switching system.

On the other hand, the Internet call processing unit 31 of the above-described control unit 30 is a voltage regulator 31-1 and a reduced (RISC; Reduced Instruction Set Computing) processor (31-2) as shown in FIG. And a reset circuit portion 31-3, an initialization buffer 31-4, a buffer 31-5, and a memory portion 31-6.

The voltage regulator 31-1 converts the 5 V power supplied from the exchange system into 3.3 V and provides the operating power of the risk processor 31-2, and the risk processor 31-2 provides the memory unit 31. -6) The operation of the entire Internet phone gateway system is controlled by using the Internet phone service related programs and data.

The reset circuit part 31-3 performs a reset function of the Internet phone gateway system, and the initialization buffer 31-4 initializes the risk processor 31-2 for determining an initial operation mode of the Internet phone gateway system. Save the data.

The buffer 31-5 performs a matching function between the risk processor 31-2 and the memory unit 31-6.

The memory unit 31-6 stores Internet phone service-related programs and data, and stores the Internet phone service-related programs in EPROM (Erasable Programmable Read Only Memory, 31-6a). Internet operation-related data such as IP (Information Provider) address is stored in RAM (Read Only Memory) .In this case, data required for operating the system is stored in DRAM (Dynamic RAM, 31-6b), and Internet such as IP address Operational data is stored in nonvolatile RAM (31-6c) so that data can be retained even when the power is turned off to avoid the hassle of re-entering each time the power is supplied.

In addition, the message connection unit 42 of the system connection unit 40 described above acts as the master control unit of the switching system and itself as a slave, the message connection unit 42 is a message as shown in the accompanying drawings, Figure 5, And a message bus controller 42-1 for controlling the bus, and a local static RAM 42-2 for temporarily storing a call control message. A memory arbiter 42-1a which stores a call control message transmitted from an internet call processing unit 31 of the switching system or the control unit 30 in the local SRAM 42-2, and records its state in a status register; The slave controller 42-1b is configured to match a clock of a corresponding slave according to a clock provided from a master.

Referring to the Internet phone service processing operation of the Internet phone gateway system according to the present invention configured as described above are as follows.

First, when a call setup message arrives from the switching system to the message connection unit 42 of the system connection unit 40, the message connection unit 42 stores it in the local SRAM 42-2, and then the Internet of the control unit 30. The call processing unit 31 generates an interrupt.

Accordingly, the Internet call processing unit 31 reads the call setup message from the local SRAM 42-2 through the memory arbiter 42-1a of the message connection unit 42, and then interworks with the Internet connection unit 20. Link incoming exchange systems on the Internet in accordance with H.225 and H.245 recommendations.

Thereafter, the Internet call processing unit 31 transmits the PCM voice / fax data received through the PCM highway connection unit 41 of the system connection unit 40 to the voice processing unit 50, and thus, the voice processing unit 50. Compresses the transmitted PCM voice / fax data into voice / fax data in a predetermined packet form according to the G.723 or G.729 recommendation, and then receives the call via the Internet in connection with the Internet connection unit 20 according to the RTP / RTCP protocol. To the switching system.

On the contrary, when a call setup message is received by the Internet access unit 20 through the Internet, the Internet call processing unit 31 of the controller 30 connects to the exchange system of the Internet side according to the H.225 and H.245 recommendations.

Subsequently, when the Internet call processing unit 31 receives the compressed packet / voice data in the form of a packet through the Internet access unit 20 from the exchange system on the Internet side, the Internet call processing unit 31 transmits it to the voice processing unit 50. The voice processing unit 50 restores the compressed packet type voice / fax data to PCM voice / fax data according to the G.723 or G.729 recommendation, and then uses the PCM highway of the system connection unit 40 according to the RTP / RTCP protocol. It is transmitted to the switching system side through the connection portion 41.

Meanwhile, the above-described voice processing unit 50 is activated by an upper layer activation command to compress the PCM voice / fax data or to restore the voice / fax data in the form of a packet. During the activation operation of the voice processing unit 50, The PCM voice / packet data obtained by recovering the compressed packet / voice data received through the Internet is transmitted to the PCM highway connection 41 of the system connection 40, and the PCM highway connection of the system connection 40 is transmitted. Voice / fax data in the form of compressed packets obtained by compressing the PCM voice / fax data received through 41 is transmitted to the Internet through the Internet connection unit 20.

In addition, the Internet connection unit 20 is connected to the Internet call processing unit 31 of the controller 30 using an 8-pin RJ-45 connector for 10 BASE-T Ethernet LAN (Local Area Network) connection.

In addition, since the MAC (Media Access Control) data received from the physical layer is an Ethernet frame or an IEEE 802.3 frame, the Internet access unit 20 analyzes the header of the received frame to confirm whether the frame is normally received, and then the corresponding frame. If the frame is to be transmitted to this IP layer, the header is deleted and the remaining data is transmitted to the IP layer, which is a higher layer.

When an IP packet transmission request message is received from an upper layer IP layer, an Ethernet address is retrieved from a destination IP address included in the corresponding IP packet by an ARP procedure, and the MAC frame header is included in the front end of the corresponding IP packet. Send to the physical layer.

On the other hand, the Internet gateway system according to the present invention is not limited to the above, it can be implemented by various alternatives, modifications and changes within the scope obvious to those skilled in the art with respect to the present invention, the PCM It can be mounted on the exchange system using the highway in the form of a board or connected as a separate device, and according to the above operation, the Internet phone service is performed using the Internet phone gateway system. Through voice / fax communication is possible, the communication fee is relatively low compared to the case of using a conventional public telephone network.

As described above, the present invention provides an Internet phone gateway system that performs a process of compressing PCM voice / fax data of a switching system using a PCM highway into voice / fax data in a packet form used on the Internet or vice versa. In the long-distance voice / fax communication in the corresponding switching system, it is possible to provide a real-time service through the Internet, thereby reducing the communication fee.

Claims (8)

An internet connection unit providing an interface between the switching system and the Internet to access the Internet; A system connection for performing PCM highway connection and message bus connection of the switching system; A voice processing unit for compressing the PCM voice / fax data into a packet form or reconstructing the compressed packet / voice data into PCM voice / fax data; And a controller for controlling operations of the internet access unit, system access unit, and voice processing unit, and performing internet call processing. The method of claim 1, And an monitoring unit configured to maintain an internal state of the Internet phone gateway system by connecting an external operator terminal through an RS-232 port in association with the control unit. The method of claim 1, The system connection unit may include: a PCM highway connection unit which connects to a PCM highway of a switching system and transmits and receives PCM voice / fax data according to a synchronous clock provided from the control unit; Internet phone gateway system further comprises a message connection for connecting to the message bus of the switching system to send and receive call control messages related to the Internet phone service. The method of claim 3, wherein The message connection unit includes: a message bus controller for controlling the message bus, wherein the main controller of the switching system is a master and itself is a slave; And a local SRAM for temporarily storing the call control message. The method of claim 4, wherein The message bus control unit includes: a memory arbiter for storing a call control message transmitted from a switching system or the control unit in the local SRAM and recording its state in a status register; And a slave controller that matches its clock according to a clock provided from the master. The method of claim 1, The voice processing unit is composed of a plurality of vocoder Internet phone gateway system, characterized in that for performing compression and decompression processing of the voice / fax data for the 32-channel PCM highway of the switching system. The method of claim 1, The control unit includes: an internet call processing unit which performs an internet call processing function between the switching system and the Internet by executing a program necessary for operating an Internet phone service; And a control circuit unit for generating a device control signal for controlling the system connection unit and the voice processing unit, and matching the PCM highway timing of the switching system with the PCM timing of the system connection unit and the voice processing unit. Gateway system. The method of claim 7, wherein The Internet call processing unit includes a memory unit for storing Internet phone service related programs and data; A risk processor for controlling the operation of the entire Internet phone gateway system by using an Internet phone service related program and data stored in the memory unit; A buffer that performs a matching function between the risk processor and the memory unit; An initialization buffer for storing initialization data of the risk processor for determining an initial operation mode; A voltage regulator supplied with an exchange system power to provide operating power for the risk processor; Internet phone gateway system further comprises a reset circuit for performing a reset function.