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provides confidentiality, message authentication, and replay protection for the Real-time Transport Protocol (RTP) traffic. There are common encryption algorithms that have been developed to protect data such as advanced encryption algorithm (AES). Chaotic encryption is new trend in cryptography based on chaos theory. Chaos is a class of complex behaviors that can emerge from nonlinear dynamical systems. A distinctive and readily observable property of chaotic systems is sensitive dependence on initial conditions. The main purpose of this paper is to propose an alternative scheme to provide confidentiality in SRTP using chaotic systems. The proposed scheme is implemented using Microsoft open source project for conference. The Chaos Based SRTP (CSRTP) is tested using StsGui NIST Statistical suite and Cryptool software [3] for security while Wireshark [4] is used for quality of service (QoS) analysis. The results related to CSRTP shows its superiority in terms of confidentiality and quality of service (QoS) compared with conventional SRTP protocol