Users Manual

SME VOIP SYSTEM GUIDE 1.1 77 | P a g e
Proprietary and Confidential
Call quality
Data is organized in a table as shown in the below example.
Screenshot
PARAMETERS DESCRIPTION
BASE STATION
NAME
Base IP address and base station name from management settings
TYPE Call
Relay conn
CALL COUNT
Count the number of calls
LOCAL/REMOTE
SIDE
Local:
Remote:
JITTER[MS]
Measures how the RTP packets are received, the lower the Jitter is the better
ROUND TRIP
LATENCY [MS]
Measures the time it takes for RTP packets to reach it destination.
PACKET LOSS [%] Percentages of packets lost.
R-VALUE A way to measure call quality, from 0-120
USER SATISFACTION LEVEL MOS R-Factor
MAXIMUM USING G.711
4.4
93
VERY SATISFIED 4.3-5.0 90-100
SATISFIED
4.0
-
4.3
80
-
90
SOME USERS SATISFIED 3.6-4.0 70-80
MANY USERS DISSATISFIED 3.1-3.6 60-70
NEARLY ALL USERS DISSATISFIED
2.6
-
3.1
50
-
60
NOT RECOMMENDED 1.0-2.6 Less than 50
MOS-VALUE
MOS measures subjective call quality for a call. MOS scores range from 1 for
unacceptable to 5 for excellent.
VOIP calls often are in the 3.5 to 4.2 range
See table above.