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Answer   MDI ( Media Delivery Index)   RFC 4445   MLR = Media Loss Rate DF = Delay Factor CC = Continuity Counter       MDI is a technique used to evaluate the quality of IP based media streams (i.e. MPEG-TS, VOIP, and other time sensitive streaming media).      Unlike MOS , MDI focuses on delay variation and packet loss to determine media quality.       MLR is the measure of missing or out of order packets. This is accomplished by monitoring the CC of the transport stream headers. The lost packets are deduced by the non sequential CC counts. Out of order packets are deduced in a similar manner    DF is the measurement of the variation of delay in packets.