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Calls analyser command 3 Configuration commands
28 NN47928-107
Calls analyser command
Voice Quality Monitoring (VQM) measures call quality and monitors calls.
Video is not monitored. The VQM analyser simulates a jitter buffer to
analyze VoIP media streams to deduce information such as packet loss,
delay, and jitter. Based on these parameters, VQM calculates R-Factors and
Mean Opinion Scores updated in real-time over the duration of calls. The
alarm levels and the duration of an alarm are also specified. Alarms are
reported in the system log as INFORM messages. The VQM analyser also
reports statistics for every VoIP media stream that flows through the
routing engine. The flows that are analysed depend on whether the call is a
local call or an external call and whether direct media (the dm media setting)
is enabled in the Media Settings command. See media settings on page 71
for more information.
For external calls (either between the LAN to the WAN or between the User
Agent to the WAN), only the inbound flow (from the WAN) is monitored by
VQM. Similarly, for local calls between the User Agent and the LAN, only
the inbound flow (from the LAN) is monitored. However, for local calls
between LAN endpoints, the dm setting determines if the flow is monitored.
z If dm is enabled, the session controller can directly establish RTP flows
between two LAN endpoints. The VQM analyser cannot measure those
direct media flows.
z If dm is disabled, the RTP flows between LAN endpoints are bridged by
the routing engine and both flows can be measured by VQM.
Use this command to configure voice quality monitoring:
call analyzer