VoIP QUALITY ASSESSMENT USING THE STUDENT t-TEST

This paper presents a statistical method for determining the quality of service (QoS) of a voice over internet protocol (VoIP) carrier. The presented method introduces a new approach: the relation between speech transmission quality and call length average, for a given VoIP carrier and portfolio of customers. Based on real world data collection, the call length distribution is computed and then the mathematical expressions for the Student t-test are derived and used. By comparing the results of the statistical test with the customer service reports we show the viability of the statistical method for determining the voice quality degradation. Key words: VoIP, voice quality, call length, Student t-test.