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Softswitch platforms SIP-based attacks filtration system design and testing

Author: WangChunHou
Tutor: XuDu
School: University of Electronic Science and Technology
Course: Communication and Information System
Keywords: SIP protocol oSIP stack Bloom Filter Algorithm Filtration system Test System
CLC: TN915.05
Type: Master's thesis
Year: 2011
Downloads: 22
Quote: 0
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Abstract


Soft-Switching technology is a best solution for VoIP in the next generation network. It uses SIP protocol to complete the establishment, modify and release of calls in VoIP. SIP protocol is recognized as the core control protocol of NGN, its design references for other internet standards and protocols, and it also follows the principles of simplicity, openness, compatibility and extension that the Internet persists. Because of its openness, the security research on SIP protocol has become the focus. In order to reduce the damage of the legitimate interests of users in SIP application, it is very important to develop an attack filtration system, as well as a forwarding test system based on SIP protocol.Based on the research background and the significance, the paper introduces the soft-switching technology and the basic principles of SIP protocol at first, including the basic concept and architecture of soft-switching technology, SIP message’s format, the call process and SIP transaction processing. These all provide a theoretical foundation for the design and implementation of the filtration system.Then, we present the key technologies the filtration system involved, propose a design philosophy basing on multi-list filtration, and achieve the match and filtration by using Bloom Filter algorithm. This paper puts forward a new structure of Bloom Filter algorithm that can gain fast match. The algorithm can achieve lower false- positive rate and fast match by extending the m vector. We also execute simulation tests for the performance of the algorithm in order to prove the effectiveness of our new algorithm structure. Designs of each functional module and work procedures of the filtration system are following. After analyzing the open source oSIP stack deeply, we introduce the implementation process of the filtration system. In the implementation process of the filtration system, we give out the function and implementation steps of each module in detail, and carry out stress testing for filtration system by using the calling flow produced Sipp software in order to test the call strength of the filtration system.At last, a test system for forwarding performance is designed, which can mainly achieve the tests about forwarding performance of equipment, such as throughput, latency, rate of packet loss and some other parameters. By requirement analysis of interface function of the test system software, we summarize the interface function, including test description function, file management function, script production and editing function, script called function and test result output function, and design the interface by using TCL language. Then we analyze the external interface of test system and carry it out successfully. Finally, we achieve the testing process by designing the appropriate test scripts, running the test script and generating test reports. At the end of this paper, we look into the future about the extended functions of the test system.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > General issues > Communication network equipment
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