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The Research and Design of SIP-Based VoIP Encrypted Transmission Terminal System

Author: GongJian
Tutor: LiuWenJing
School: Beijing University of Posts and Telecommunications
Course: Signal and Information Processing
Keywords: VoIP Encrypted transmission Speech coding Low bit rate SIP AMBE
CLC: TN916.2
Type: Master's thesis
Year: 2010
Downloads: 88
Quote: 1
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Abstract


With the rapid development of Internet technology , voice interaction is becoming increasingly popular on the Internet . VoIP technology network sector has become the most attention , one of the fastest growing technology . IP network as voice over IP media , however , there are a variety of security risks , the IP packet on the network most likely to be stolen by hackers , causing the voice is lost or eavesdropping . Secure transmission of IP voice network is a very important issue , and has become a hotspot of research and application . In order to protect the security of VoIP transmission , voice data encryption. Encryption computation , however , usually , there are certain requirements of the data bit rate selection of low bit rate voice compression method . AMBE ( state-of-the-art multi-band excitation ) is based on the MBE technology voice compression coding algorithm with good speech quality , low coding rate against background noise and channel interference ability and planted in DVSI company AMBE-1000 voice compression chip within . The chip is a high-performance , multi - rate speech codec chip , the minimum coding rate of up to 2.4kb / s . AMBE-1000 with ARM core - based embedded microprocessor as the hardware platform , cross-compiler development environment to Linux as the host development platform , and transplant of the oSIP protocol stack , prepared on the basis of the application , implementation, and other SIP device interoperability . By the the SIP extension function , the transmission of VoIP encryption key management . ARM - based encryption algorithm with a simple encryption scheme . Testing and performance analysis show that the actual compression bit rate is less than 4.8kb / s, and the voice quality is good .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Phone > Telephone lines, telephone network
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