Cisco Systems OL-12232-01 manual Voice Quality Metrics

Chapter 8 Monitoring the Cisco Unified IP Phone Remotely

Streaming Statistics

Table 8-5 Streaming Statistics Area Items (continued)

	Item	Description
	Voice Quality Metrics
	MOS LQK	Score that is an objective estimate of the mean opinion
		score (MOS) for listening quality (LQK) that rates
		from 5 (excellent) to 1 (bad). This score is based on
		audible concealment events due to frame loss in the
		preceding 8-second interval of the voice stream. For
		more information, see the “Monitoring the Voice
		Quality of Calls” section on page 9-24.
		Note The MOS LQK score can vary based on the
		type of codec that the Cisco Unified IP Phone
		uses.
	Avg MOS LQK	Average MOS LQK score observed for the entire voice
		stream.
	Min MOS LQK	Lowest MOS LQK score observed from start of the
		voice stream.
	Max MOS LQK	Baseline or highest MOS LQK score observed from
		start of the voice stream.
		These codecs provide the following maximum MOS
		LQK score under normal conditions with no frame
		loss:
		• G.711 gives 4.5
		• G.729 A /AB gives 3.7
	MOS LQK Version	Version of the Cisco proprietary algorithm used to
		calculate MOS LQK scores.
	Cmltve Conceal Ratio	Total number of concealment frames divided by total
		number of speech frames received from start of the
		voice stream.
	Interval Conceal Ratio	Ratio of concealment frames to speech frames in
		preceding 3-second interval of active speech. If using
		voice activity detection (VAD), a longer interval might
		be required to accumulate 3 seconds of active speech.
Cisco Unified IP Phone 7970G/7971G-GE for Cisco Unified Communications Manager 6.0
OL-12232-01			8-19