Browse Prior Art Database

NGN protocol analyzer

IP.com Disclosure Number: IPCOM000033020D
Original Publication Date: 2004-Dec-25
Included in the Prior Art Database: 2004-Dec-25

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Telecommunication networks usually have to be tested after being installed. Up till now it was necessary to execute test scenarios by the use of an additional softswitch (a concept of separating network hardware from network software) or an additional gateway. This method has got some difficulties, e.g. to induce the gateway to generate errors which are part of the test scenario. For the purpose of testing a network (e.g. so called Next Generation Networks, NGN) a simulation software can be used. A new MGCP Simulator software is able to simulate the Media Gateway Control Protocol (MGCP) in the following functions: Media Gateway Controller, Media Gateway, Media Server and Residential Gateway. The MGCP is defined in the RFC 2705 of the IETF (Internet Engineering Task Force). An embodiment of a telecommunication network and some of its elements including a MGCP simulator is shown in Fig. 1. A general vision and description of an embodiment of the MGCP Simulator software is given in the following. Fig. 2 shows a sample of the display of a computer running the software. A glossary of terms used in the figures is assorted in Fig. 22. Definitions: - The Media Gateway or trunk gateway is the interface between the conventional telephone network (Public Switched Telephone Network, PSTN) and voice via IP network (Internet Protocol mechanisms). - The Residential Gateway provides the interface between analog lines and voice via the IP network. - The Media Server provides advertisement via IP network. - The Media Gateway Controller is the agent responsible for signaling between the Media Gateway, the Residential Gateway, the Media Server and the Residential Gateway. - By convention, whenever SW is mentioned in this text, it means the MGCP Simulator software. The software can be installed at any appropriate computer, for example a PC based on model X86 with at least 64MB memory and MS Windows NT, Windows 2000 professional or later versions.

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NGN protocol analyzer

Idea: Valdemar Moreira Pavesi, BR-Curitiba

Telecommunication networks usually have to be tested after being installed. Up till now it was necessary to execute test scenarios by the use of an additional softswitch (a concept of separating network hardware from network software) or an additional gateway. This method has got some difficulties, e.g. to induce the gateway to generate errors which are part of the test scenario.

For the purpose of testing a network (e.g. so called Next Generation Networks, NGN) a simulation software can be used. A new MGCP Simulator software is able to simulate the Media Gateway Control Protocol (MGCP) in the following functions: Media Gateway Controller, Media Gateway, Media Server and Residential Gateway. The MGCP is defined in the RFC 2705 of the IETF (Internet Engineering Task Force). An embodiment of a telecommunication network and some of its elements including a MGCP simulator is shown in Fig. 1. A general vision and description of an embodiment of the MGCP Simulator software is given in the following. Fig. 2 shows a sample of the display of a computer running the software. A glossary of terms used in the figures is assorted in Fig. 22.

Definitions:

- The Media Gateway or trunk gateway is the interface between the conventional telephone network (Public Switched Telephone Network, PSTN) and voice via IP network (Internet Protocol mechanisms).

- The Residential Gateway provides the interface between analog lines and voice via the IP network.

- The Media Server provides advertisement via IP network.

- The Media Gateway Controller is the agent responsible for signaling between the Media Gateway, the Residential Gateway, the Media Server and the Residential Gateway.

- By convention, whenever SW is mentioned in this text, it means the MGCP Simulator software.

The software can be installed at any appropriate computer, for example a PC based on model X86 with at least 64MB memory and MS Windows NT, Windows 2000 professional or later versions.

Fig. 3 shows a scheme of the MGCP stack. The MGCP was developed to operate with UDP (User Datagram Protocol). The functions of Ethernet, IP and UDP layers are executed by Winsock.ocx (a program module that can be accessed by other programs in a Windows environment; OCX: OLE (Object Linking and Embedding) Control Extension). The application layer makes definitions and requirements for lower calls. The UDP ports defined for MGCP are 2727 as MGC and 2427 as MG. On the IP layer, the PC's IP address will be used as source and destination address and will be defined at the SW graphic interface or by a configuration file (config_mg.txt).

In this case the function of the SW is to generate MGCP messages and send them to Winsock which is prepared to assemble a UDP datagram with source and destination ports defined by the application. Furthermore, the SW generates IP packages with source and destination. Beyond this the SW generates IP packages defined...