QoS evaluation based on extend E-Model in VoIP

Voice over Internet Protocol (VoIP) is a technology that transports voice data packets across packet switched networks using the Internet Protocol (IP). The key research is to develop a new method for QoS determination and dynamic control of the network that is applicable to VoIP industry. The paper investigates the effects of packet loss, delay and jitter on speech quality for VoIP. It extends the coverage of the standard E-Model. This paper also compares the performances of the original and the modified E-models by applying them to an evaluation of conversational quality in practical VoIP systems (Skype, windows live messenger, Google Talk) for various delay, packet loss and jitter. The results show that the enhanced E-Model achieves good accuracy.