KR100312598B1 - System of Performing Voice over Internet Protocol in the Switching System - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for providing Voice over Internet Protocol (VoIP) in a switching system, and more particularly to a system for providing VoIP in a switching system that provides low-cost VoIP with a minimum number of signaling messages without occupying line resources.

The present invention is a number seven signal device for transmitting and receiving signals; An exchange / translation processor, a subscriber processing processor, and a maintenance processor, which are in charge of number translation, call processing, and intelligent network signal processing for data authorized through the number seven signaling device; And an IP processing device for compressing the data, packet / packet conversion, and inverse conversion. Here, data transfer between the IP processing device, the exchange / translation processor, the subscriber processing processor and the maintenance processor, and the number seven signal device is performed by the IPC inside the exchange.

Description

System of Performing Voice over Internet Protocol in the Switching System

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for providing Voice over Internet Protocol (VoIP) in a switching system, and more particularly to a system for providing VoIP in a switching system that provides low-cost VoIP with a minimum number of signaling messages without occupying line resources.

As shown in FIG. 1, the network for providing VoIP in the related art is a core network 10, which is a network implemented by a packet or cell exchange technology, and a network in which subscribers are currently accommodated. PSTN 11, STP pair 12, which is a relay providing access to the database to the switch of the PSTN 11, 800 or LIDB 13, which is a database having subscriber information and service information, and a local exchange A plurality of EOs 14, a tandem exchange 15 which is a long distance switch, a service agent 16 which is a functional block that manages services provided by the core network, and a routing that is a functional block responsible for call routing and number translation. Of a signaling gateway 18, which is a functional block responsible for transmitting and receiving signals between the core network 10 and the PSTN 11, and the core network 10 and the PSTN 11; Transformation of data traffic Charge of the functional blocks in the trunk gateway, which consists, including;; (20 Agent Call Connection) (Trunk Gateway 19) and the core network 10, the call connection function block agent that is responsible for call processing in the. Here, the server for controlling the voice call includes 800 or LIDB 13, service agent 16, call connection agent 20, routing / translation server 17, and a function block for processing control signals. Are the STP pair 12 and the signaling gateway 18.

The network configured as described above is to provide a voice call generated in the PSTN 11 to the core network 10, the voice call generated in the PSTN (11) via the tandem exchange 15, the trunk gateway (19) ) Is routed in the core network 10 after the packet / packet conversion process, and is then routed to the corresponding PSTN 11 after the packet / packet conversion process in the trunk gateway 19.

At this time, the routing path for voice traffic is from the subscriber to the EO 14, the tandem exchanger 15, the trunk gateway 19 and the core network 10, and back to the trunk gateway 19, the tandem exchanger 15 and It is made up of subscribers via the EO 14.

For example, the call setup process occurring in the above-described configuration will be described.

First, as shown in FIG. 2 as a configuration for performing a call setup process, SSP (Service Switched Point) 21, 22, which is a functional block accommodated in an EO or a tandem exchange for access to an intelligent network, and control for an intelligent network call Signaling gateways 23 and 24, which are signal gateway stations, call connection agents 25 and 26, which are functional blocks in charge of intelligent network call processing, and routing / translation servers, which are functional blocks in charge of number translation and routing of voice call traffic ( 27) and trunk gateways 28 and 29, which are functional blocks responsible for packet / packet conversion and inverse conversion of voice call traffic. Here, the first SSP 21, the first signaling gateway 23, the first access agent 25, and the first trunk gateway 28 are calling party functional blocks, and the corresponding second SSP 22 and the second signaling are provided. The gateway 24, the second connection agent 26 and the second trunk gateway 29 are called party functional blocks.

The operation procedure of the configuration as described above is as follows.

When the first SSP 21 sends the 'connection request' to the first access agent 25 via the first signaling gateway 23, the first access agent 25 sends a first trunk gateway 28. Receives a response from the first trunk gateway 28 after sending a command to perform call connection and data conversion, and queries the routing / translation server 27 to be a call connection agent corresponding to the called PSTN. The call connection agent 26 is found from the routing / translation server 27, and the 'connection request' is sent to the second call connection agent 26.

Accordingly, the second connection agent 26 sends a command to the second trunk gateway 29 to establish a virtual channel with the first trunk gateway 28 and then responds from the second trunk gateway 29. And transmits the 'connection request' to the second SSP 22 via the second signaling gateway 24.

Accordingly, the second SSP 22 completes the call setup and sends a 'connection setup' message to the second signaling gateway 24, the second access agent 26, and the first call after transmitting a ring to the subscriber. It is sent to the first SSP 21 via the access agent 25 and the first signaling gateway 23.

When the called subscriber responds, the second SSP 22 removes the audible ring and establishes a path with the called subscriber, and then sends a 'response' message to the first SSP 21.

Then, after receiving the 'response' message, the first SSP 21 sets the calling subscriber's path and completes the bidirectional call path, thereby completing the call setup.

However, the conventional technology as described above has the disadvantage that the line resources of the EO and tandem exchange of the PSTN is occupied with the increase of VoIP, and there are many functional blocks for providing VoIP, which consumes a lot of signal resources. There is a disadvantage in that new network components (signaling gateway, call access agent, and trunk gateway) for providing VoIP are required.

In order to solve the problems and disadvantages described above, the present invention relates to an efficient VoIP providing function structure of the switching system, by providing a VoIP by functionally distributing the signaling gateway, call connection agent and trunk gateway in the exchange, It aims to efficiently provide VoIP with the minimum number of signaling messages without occupying the circuit resources of PSTN / ISDN, which is a disadvantage of the method, and to provide a low-cost VoIP service to general subscribers.

1 is a diagram showing the configuration of a network for providing a conventional Voice over Internet Protocol (VoIP).

FIG. 2 is a diagram illustrating a configuration for explaining a call setup process in FIG. 1. FIG.

3 is a diagram illustrating a configuration of an exchange system according to an embodiment of the present invention.

4 is a diagram illustrating a configuration for explaining a VoIP service path in FIG. 3; FIG.

FIG. 5 is a diagram illustrating a configuration of a network for providing VoIP when an exchange is installed in PSTN / ISDN (Public Switched Telephone Network / Integrated Services Digital Networks) in FIG.

FIG. 6 is a diagram illustrating a configuration for explaining a call setup process in FIG. 5; FIG.

Explanation of symbols on the main parts of the drawings

31: Subscriber Line Interface

32, 54-1 ~ 54-3: Digital Trunk Interface

33: modem call termination device (Modem Interface)

34: Data Handler

35, 35-1, 35-2, 58: IP processing unit (Internet Protocol Server)

36: Local Service Devices

37, 61: Mass Memory Switch

38, 55-1 ~ 55-3: Time Switch

39, 39-1, 39-2, 64: Operation and Maintenance Processor

40, 40-1, 40-2, 66: Switching Subsystem Processor

41, 41-1, 41-2, 65: Switching and Number Translation Processor

42, 42-1, 42-2, 53: number seven signaling device (Signaling System No.7)

43, 63: IP network (Internet Protocol Network)

51: AIN (Advanced Intelligent Network) / SS7 Network

52: IP (Intelligent Peripheral)

56: Space Switch and Link

57-1, 57-2, 71: PSTN / ISDN

59: IPC Gateway (Inter Processor Communication Gateway)

60: EC / TC (Echo Cancellation / Trans-Code)

62: IP gateway

67: device processor

70: Core Network

72: Signaling Transfer Point Pair

73: 800 or LIDB (Line Information Database)

74, 74-1, 74-2: EO (End Office) or Tandem Exchange

75: Service Agent

76: Routing and Translation Server

77: Packet Network

The present invention for achieving the above object is a number seven signal device for transmitting and receiving signals; An exchange / translation processor, a subscriber processing processor, and a maintenance processor, which are in charge of number translation, call processing, and intelligent network signal processing for data authorized through the number seven signaling device; And an IP processing device for compressing the data, packet / packet conversion, and inverse conversion. Here, data transfer between the IP processing device, the exchange / translation processor, the subscriber processing processor and the maintenance processor, and the number seven signal device is performed by the IPC inside the exchange. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The signaling system, the call access agent, and the trunk gateway have distributed functions in the switching system according to an embodiment of the present invention.

In more detail, according to an embodiment of the present invention, a structure in which a corresponding signaling gateway, a call connection agent, and a trunk gateway are functionally distributed inside the switchboard is illustrated in FIG. 3, wherein a subscriber line interface (SLI) is provided. 31), Digital Trunk Interface (DTI); 32, Modem Interface (MDI); 33, Data Handler (DH); 34, Internet Protocol Server (IPS) 35, Local Service Devices (LS) 36, Mass Memory Switch (MMS) 37, Time Switch ( Time Switch (TSW) 38, Operation and Maintenance Processor (OMP) 39, Switching Subsystem Processor (SSP) 40, Switching and Number Translation Processor (SNP) 41 and a number seven signaling device m No. 7 (SS7) 42 and an IP network 43 are provided.

Here, the VoIP providing system for providing the VoIP includes an IP processing unit 35, an exchange / translation processor 41, a subscriber processing processor 40, a maintenance processor 39, and a number seven signaling device 42. There is). The IP processing device 35 is responsible for compression, packet / packet conversion, and inverse conversion for VoIP, and serves as a trunk gateway. The exchange / translation processor 41, the subscriber processing processor 40, and the maintenance processor 39 are responsible for number translation, call processing, and intelligent network signal processing, and serve as call connection agents and service agents. The number seven signal device 42 is an intelligent network matching unit that performs signal transmission and reception, and serves as an SSP function and a signaling gateway.

FIG. 4 is a diagram illustrating a VoIP service path occurring in a switching system of the present invention, and shows how a voice call inputted through a circuit switching method in a switching system is routed to and through a packet network through a path.

That is, the configuration for explaining the VoIP service path is AIN (Advanced Intelligent Network) / SS7 network 51, IP (Intelligent Peripheral) 52, the number seven signaling device 53, DTI (54-1 ~ 54) -3), Time Switch and Link (55-1 to 55-3), Space Switch and Link (56), ISDN / PSTN (57-1, 57-2), IP Processing unit 58, IPC gateway (Inter Processor Communication Gateway) 59, EC / TC (Echo Cancellation / Trans-Code) 60, large-capacity packet switching unit 61, IP gateway 62, IP network 63, maintenance processor 64, exchange / translation processor 65, subscriber processor 66, and Device Processor 67. Here, the IPC gateway 59 is intended to transfer the call control data and packet data existing in the switching system to the large-capacity packet switching device 61 which is centrally operated and the IP processing device 58 is voiced. It is in charge of compression and voice coding.

Looking at the operation of the configuration as described above are as follows.

When the subscriber who wants VoIP service is inputted to the exchange, the exchange / translation processor 65 in the exchange performs number translation (for example, by special number) to receive the subscriber to the EC / TC 60.

At this time, the voice traffic of the subscriber is packetized through voice processing such as compression and coding in the EC / TC (60). In addition, since the packetized voice traffic should no longer occupy circuit resources of the exchange, after EC and TC processing, the logical resources and logical resources are logically passed through the large-capacity packet exchange apparatus 61 which is a switch for packet communication of the switching system. The large-capacity packet switching device 61 is reached through the divided time switches 55-1 to 55-3 and the space switch 56.

Then, the packetized voice traffic is routed from the large-capacity packet switching device 61 via the IP gateway 62 to the IP network 63.

On the contrary, in the reverse process, the voice of the subscriber input from the IP network 63 passes through the IP gateway 62, the large-capacity packet exchange device 61, and the time switches 55-1 to 55-3. The EC / TC 20 transmits the packet / packet process, decoding, and compression decoding to the subscriber.

5 and 6 are diagrams illustrating a VoIP providing structure schematically arranged from the network point of view when the switching system shown in FIG. 3 is located at PSTN / ISDN, and is shown in FIG. 3 as compared to a conventional VoIP providing structure. This shows how much circuit resources can be saved using.

In other words, when the switching system shown in FIG. 3 is installed in the PSTN / ISDN, the configuration of the network for providing VoIP is as shown in FIG. 5 with the core network 70, the PSTN / ISDN 71, STP pair 72, 800 or LIDB 73, EO or tandem exchanger 74, service agent 75, and routing / translation server 76. Here, the corresponding EO or tandem exchange 74 accommodates the SSP for accessing the intelligent network and has the functions of signaling gateway, trunk gateway, and call connection agent, that is, the SSP, signaling gateway, Functions of call access agent and trunk gateway are absorbed.

Thus, it is possible to save the circuit resources from the EO or tandem exchange 74 to the core network 70 and the circuit resources in the EO or tandem exchange 74, and to send SS7 related messages necessary for call establishment to the EO or It can be processed directly in tandem exchanger 74.

FIG. 6 is a diagram for explaining a signaling procedure required for call setup occurring in the VoIP providing structure shown in FIG. 5, and includes switches 74-1 and 74-2, routing / translation server 76, and the like. , Packet network 77. Here, the respective exchanges 74-1 and 74-2 have IP exchangers 35-1 and 35-2 that perform the functions of trunk gateways, and exchange / services that perform the functions of call connection agents and service agents. The number seven that performs the functions of the translation processor 41-1, 41-2, the subscriber processor 40-1, 40-2, and the maintenance processor 39-1, 39-2, and the SSP and the signaling gateway. Signal devices 42-1 and 42-2 are provided, respectively.

The operation procedure of the configuration as described above is as follows.

The first number seven signal device 42-1 is connected to the first exchange / translation processor 41-1, the first subscriber processing processor 40-1, and the first maintenance processor 39-1. Request ', the first exchange / translation processor 41-1, the first subscriber processor 40-1, and the first maintenance processor 39-1 use the first IP processor 35-1. ) Receives a response from the first IP processing unit 35-1 after granting a command to perform call connection and data conversion, and queries the routing / translation server 76 corresponding to the incoming PSTN / ISDN. The second exchange / translation processor 41-2, the second subscriber processing processor 40-2, and the second maintenance processor 39-2 are found from the routing / translation server 76.

The first exchange / translation processor 41-1, the first subscriber processor 40-1, and the first maintenance processor 39-1 exchange the second exchange / learning the connection request. It sends out to the translation processor 41-2, the 2nd subscriber processing processor 40-2, and the 2nd maintenance processor 39-2.

Accordingly, the second exchange / translation processor 41-2, the second subscriber processor 40-2, and the second maintenance processor 39-2 are virtual channels with the first IP processor 35-1. The second IP processing unit 35-2 receives a response from the second IP processing unit 35-2 and sends the 'connection request' to the second number seven signal unit 42-2. , The second number seven signaling device 42-2 completes the call setup and sends a ring to the subscriber. The first exchange / translation processor 41-1, the first subscriber processing processor 40-1, and the first maintenance through a two-subscriber processing processor 40-2 and a second maintenance processor 39-2. The processor 39-1 sends the signal to the processor 39-1.

The first exchange / translation processor 41-1, the first subscriber processor 40-1, and the first maintenance processor 39-1 transmit the 'connection establishment' message to the first number seven signal. Application to device 42-1.

Accordingly, when the called party responds, the second number seven signaling device 42-2 removes the audible ring and establishes a path with the called party through the packet network 77 to receive a 'response' message. The signal is sent to the first number seven signal device 42-1.

Then, after the first number seven signaling device 42-1 receives the 'response' message, the call setup is completed by setting the path of the calling subscriber and completing the two-way call path.

As described above, each of the exchanges 74-1 and 74-2 includes an IP processing unit 35-1 and 35-2, an exchange / translation processor 41-1 and 41-2, and a subscriber processing processor ( 40-1 and 40-2 and the maintenance processors 39-1 and 39-2 to perform the functions of a trunk gateway, a call connection agent and a service agent, and an SSP and a signaling gateway. -1, 35-2 and between exchange / translation processor 41-1, 41-2, subscriber processing processor 40-1, 40-2 and maintenance processor 39-1, 39-2. Message delivery is not by way of a network, but by IPC inside the exchanges 74-1 and 74-2. Therefore, in the call flow control shown in FIG. 6, the message actually occurring in the network is transmitted to the second exchange / translation processor 41-2, the second subscriber processing processor 40-2, and the second corresponding to the incoming PSTN / ISDN. When the maintenance processor 39-2 is found from the routing / translation server 76, the second exchange / translation processor 41-2 and the second subscriber processing processor 40- that have found the 'connection request' are found. 2) and when sending to the second maintenance processor 39-2, a 'connection establishment' message is sent to the first exchange / translation processor 41-1, the first subscriber processing processor 40-1, and the first. When the call is sent to the maintenance processor 39-1 and when the call is set up through the packet network 77.

As described above, according to the present invention, the functions of the trunk gateway, call connection agent and service agent, and the SSP and signaling gateway are built in the exchange, so that the circuit resources of the PSTN / ISDN are not occupied in accordance with the increase of VoIP and occur when providing VoIP. Because the number of signaling messages is kept to a minimum and new network components are not needed, the operator can provide VoIP to the subscribers efficiently and inexpensively.

Claims (2)

A number seven signal device in charge of transmitting and receiving signals; An exchange / translation processor, a subscriber processing processor, and a maintenance processor, which are in charge of number translation, call processing, and intelligent network signal processing for data authorized through the number seven signaling device; And an IP processing unit for compressing the data, packet / packet conversion, and inverse conversion. The method of claim 1, And a data transfer between the IP processing device, the exchange / translation processor, the subscriber processing processor and the maintenance processor, and the number seven signaling device is performed by the IPC inside the exchange.