Enhancing VoIP Security and Efficiency using VPN

Currently, security is the most important issue in VoIP (Voice over IP) systems. This study aimed at enhancing VoIP security using VPN (Virtual Private Network) technology. We developed an Android application supporting VoIP in conjunction with Linphone, OpenVPN, and Asterisk. Our system worked effectively to secure the VoIP. The impact of this work is as follows. First, our system provides the functionality of generating anonymous packets. Second, our experiments showed that invocation of VPN simultaneously indeed did not reduce the overall calling quality. Last, our proposed research idea has big impacts on security and packet encryption.