Cisco Systems OL-19025-01 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
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.
Sender Size		RTP packet size, in milliseconds, for the transmitted stream.
Sender Reports Received1		Number of times RTCP Sender Reports have been received.
Sender Report Time		Last time at which an RTCP Sender Report was received.
Received1
Rcvr Size		RTP packet size, in milliseconds, for the received stream.
Rcvr Discarded		RTP packets received from network but discarded from jitter buffers.
Rcvr Reports Received1		Number of times RTCP Receiver Reports have been received.
Rcvr Report Time Received1		Last time at which an RTCP Receiver Report was received.
Voice Quality Metrics
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.

1. When the RTP Control Protocol is disabled, no data generates for this field and thus displays as 0.

Related Topics

•“Configuring Settings on the Cisco Unified IP Phone” chapter

	Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 7.1 (SCCP)
8-10	OL-19025-01