PRACTICAL ESTIMATION OF VOIP QOS BASED ON CORRELATED ANALYSIS OF TRANSPORT PROTOCOL IMPAIRMENTS AND PERCEPTUAL SPEECH QUALITY

摘要

The request for QoS in packet transmission networks (specifically in Voice-over-Internet Protocol (VoIP) networks) can be considered as two-fold: to ensure satisfactory performance at (relevant) protocol levels (IP, TCP/UDP, RTP), as well as at perceptual speech quality level, observed in between end points of the system. With this respect, in this paper, correlation between these two levels of testing is proposed in a chosen typical test environment, where in addition to signaling protocols decoding and expert analysis, RTP packet jitter and loss have been measured and statistically analyzed. Then these results have been correlated with the results of the objective perceptual speech quality testing, providing the integral practical QoS criterion.