The Security Enhancement and Voice Quality Evaluation of ISANBox.F

บทคัดย่อ

FreeSWITCH is a highly efficient Voice over IP (VoIP) package that can serve a high number of concurrent calls. It has also been well-known for its reliability, functionality and quality. However, from literature, FreeSWITCH is still vulnerable to security threats, such as SIP Session Hijacking, SIP flooding, Cancel/Bye Attacks, Voice Eavesdropping by sniffing RTP. In the previous work (ISANBox.F version 1), we developed a VoIP package by extending the security option in FreeSWITCH. Yet, it is still lacking in the security of the signaling protocol. Furthermore, the quality of voices after security enhancement has not yet been evaluated. Hence, in this paper, we propose to extend Free SWITCH to protect against the aforementioned security threats. Furthermore, this research has also developed the GUI and installation set to increase user-friendliness of FreeSWITCH. At the end, we have experimented on our extended FreeSWITCH to investigate both security and quality issues. The experimental results has demonstrated that the extended package is more secure. Also, the security overhead from our implementation have minimal effects on its quality. By using MOS and R-factor as quality metrics, we have found that our extended package still fits very well with the VoIP quality standard of the National Broadcasting and Telecommunication Commission (NBTC).