Cisco Systems OL-21011-01 manual Mos Lqk, Information, see Monitoring the Voice Quality of Calls

Chapter 8 Monitoring the Cisco Unified IP Phone Remotely

Streaming Statistics

Table 8-5	Streaming Statistics Area Items (continued)
Item		Description
Rcvr Report Time Sent1		Internal time stamp indication when a RTCP Receiver Report was sent.
Rcvr Packets		Total number of RTP data packets received by the phone since starting receiving data on
		this connection. Includes packets received from different sources if this is a multicast call.
		The value displays as 0 if the connection was set to send-only mode.
Rcvr Octets		Total number of payload octets received in RTP data packets by the device since starting
		reception on the connection. Includes packets received from different sources if this is a
		multicast call. The value displays as 0 if the connection was set to send-only mode.
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 Monitoring the Voice Quality of Calls, page 9-15.
		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 on the Cisco Unified IP Phones 7962G and 7942G provide the following
		maximum MOS LQK score under normal conditions with no frame loss:
		•	G.711 gives 4.5
		•	G.722 gives 4.5
		•	G.728/iLBC gives 3.9
		• G.729 A/AB gives 3.8
		These codecs on the Cisco Unified IP Phones 7961G/G-GE and 7941G/41G-GE 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.
Cumulative 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.
Max Conceal Ratio		Highest interval concealment ratio from start of the voice stream.
Conceal Secs		Number of seconds that have concealment events (lost frames) from the start of the voice
		stream (includes severely concealed seconds).
Severely Conceal Secs		Number of seconds that have more than 5 percent concealment events (lost frames) from
		the start of the voice stream.
Latency1		Estimate of the network latency, expressed in milliseconds. Represents a running average
		of the round-trip delay, measured when RTCP receiver report blocks are received.
Max Jitter		Maximum value of instantaneous jitter, in milliseconds.

	Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP)
8-12	OL-21011-01