In this paper, we propose a robust time-frequency decomposition (RTFD) model to suppress of impulse noise mixed with small dense Gaussian noise in VoIP systems. Mixed Gaussian-impulse noise may appear during transmission over cordless phones, in VoIP systems and during the acquisition stage of old-time audio recordings. Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks. The transmission mechanism uses the IP protocol with an IP address. Special equipment must be used to convert the analog signal into a digital one. VoIP systems employ session control and signaling protocols to control the signaling, set-up, and tear-down of calls. Noise is an interference with the quality of the signal. Noise can be caused by a variation in the signal, packet loss, reduction in the signal strength, or by having additional users on the system such as the Internet. For this we develop 2 algorithm fidelity-oriented algorithm and articulation oriented with RTFD model. By this technique we can remov the noise from the VoIP systems.