EXFO EXpert VoIP Test Tools - Manual (Page 68)

Test Results
62 EXpert VoIP Test Tools
Call Quality Details
Call Quality Details
From the Tests menu, tap Results and the Call Quality Details tab.
MOS / R-Factor

EXFO Conversational MOS is the Voice Quality Conversational Mean
Opinion Score (MOS) score for the incoming RTP stream.

User R-Factor is the Voice Quality R-factor for the incoming RTP
stream.
RTP Statistics

Packet Count is the number of good packets received from endpoint.

Lost Packets is the Number of lost packets in the incoming RTP
stream.

Late Packets is the number of RTP packets that arrived with a higher
jitter than the acceptable jitter input parameter value. The test discards
all late packets.

Early Packets is the number of packets received and dropped by the
local endpoint that were too early and could not be buffered within the
jitter buffer.

Total Lost Packets is the total number of RTP packets that were early,
lost and late. This value is calculated using the jitter buffer length input
parameter value.

Total Lost Packets (%) is the percentage of total lost packets from the
number of correct packets and total lost packets. i.e total lost
packets/(packet count + total lost packets)* 100.