System Guide

SME VOIP SYSTEM GUIDE 4.7 77 | P a g e
Proprietary and Confidential
5.16.6 Call quality
The Call quality web is accessed by http://ip/CallQuality.html and the data is organized in a table as shown in 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.