VoIP technology allows voice messages transmitted through the network, but it also encounters information security threats such as packet sniffering and authentication. In this research we propose an integrated algorithm - VoIPS (VoIP Secure). It conduct a secured VoIP communication which afforded confidentiality and message authentication. Furthermore, side-effect to performance is trival and able to eliminate the risk of well-known replay attack which used on VoIP system. According to our simulation experiments, the proposed system can be created to construct a secure VoIP communication system. A hardware prototype is created to verify the proposed system which practically feasible.