| With the rapid development and popularization of internet, wide band services are increasingly diversiform. As the maturation of ADSL and VoIP, many people get to use the IP phone on internet for daily communications. Having the acceptable quality and being very cheap even free, VoIP is used widely. At the same time, the phenomenon of illegal VoIP management on wide band for internal and overseas telephone services appears, and becomes increased. Because of the appearance of illegal VoIP management, a mass of telephone traffic is losing, and ISPs incurr substantial economic losses. Moreover some illegal VoIP manager fabricates legal ISP, but the quality of communication and service level are greatly under the standard of legal ISP, this influences the reputation of legal ISP.Now Jilin CNC has many internet users, among these users, illegal VoIP manager exists or not, how illegal VoIP services menace legal ISP potentially, and what bad influence will be, all of that are questions for Jilin CNC. So deep analysis for instance of VoIP on wide band is imperative under the situation, the urgent affairs are building a VoIP monitoring system to catch the"ash list"of the illegal VoIP managers,user telephone traffic,directions and the calling mode, based on it taking some effective ways to keep within limits, furthest minishing the telephone traffic lose,income lose and the influence of normal telephone operational order.This article firstly introduces the development status of VoIP technique, VoIP technique passes breaking,developing and maturing three periods, it has been maturative, the rapid development of this technique and the more and more abroad applications make a big strike to the ISPs who mostly depend on the income of telephone. Educing the aim of this article is researching how to build a VoIP monitoring system, making ISPs have the ability to monitor the situation of VoIP on wide band, and beat the illegal VoIP managers effectively.The emphases of this article are the part three and the part four, in these parts several popular calling modes are discussed, and the key techniques of VoIP managing are contrastively analyzed. After analyzing the position and mode of data collection point, the project of Jilin CNC VoIP monitoring system is made :Considering the correct degree of monitoring result and the whole investment, Jilin CNC deploys the system in Changchun,Jilin,Yanji,Siping and Tonghua five cities, monitoring point put on the line between switches in gathering layer and routers in core. The whole system contains two parts, servicesmonitoring analyzers and center server. Services monitoring analyzers take charge of collecting and pretreating the illegal VoIP data, center server takes charge of gathering and presenting data and offers the function of logic analyzing, offers the operation and configuration for users on web. The mode of access could be prismatic. Two deploying modes are used: 1.distributing deployment, centralized managment. Considering the wide brand of Changchun city develops rapidly, whole net is monitored, services monitoring analyzers are deployed in every monitoring point, and the disposed data is transmitted to the center server to be managed statistically. 2.moving deployment, independent management. Jilin,Yanji,Siping,Tonghua cities take the moving deployment mode, this mode integrates all the functions of center server and service monitoring analyzers, composes a portable system, every monitoring point deals with the data singlely and presents on web.Jilin CNC uses NC-BTS illegal VoIP monitoring system made by Zhongchuangxince Company, this system has these characters and advantages:1. High speed data collecting and analyzing based on hardware, having high speed ports.2. Call track and signal process compound technique.3. Auto-recognasing port and automatic following for multi- protocol.4. Completely analyzing the mode of VoIP management, distinguishing the key equipment.5. The technique of voice information distilling and reverting, particular and exact information of management evidence.6. Combined with signal flow and media flow, signal flow is primary, and media flow is subordinate.7. Plenty of control method– blocking and disturbing.After that, the article introduces the function of NC-BTS VoIP monitoring system software made by Zhongchuangxince Company detailedly; And make the test of the function of the system, uses that system to analyze the present condition of existing VoIP, and succeeds to position the illegal VoIP manager. It is the conclusion that, the function of the system accords the need, coming to the anticipant result. Using the system to monitor internet VoIP makes Jilin CNC have an ability of managing Jilin VoIP service, it can beat the illegal VoIP managment effectively, and purify the market competition environment.The VoIP monitoring system currently accords the need of monitoring and control the illegal VoIP management. With the development of the internet, the extension of the city area network, the line on the current data collection position will increase quickly, the contract of opposite minitoring scope makes the detectionof illegal VoIP management become difficult, and, the operation of mobile monitoring mode also will be more and more difficult. Therefore, at the time of the network scale extending gradually, we should consider to move the monitoring point to upper layar, to the gate of the city area,At the export of the 2.5G optic circuit or 10G optic circuit, we can adopt the monitor of single direction circuit to monitor the whole city area network., finding out the suspicious VoIP traffic, at the same time we deploy mobile monitoring point at gathering layer, used to further obtain the evidence and make the precision stroke. |
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