Cisco 7971G-GE Administration Guide - Page 160

Streaming Statistics Chapter 8 Monitoring the Cisco Unified IP Phone Remotely Table 8-5 Streaming Statistics Area Items (continued) Item Max MOS LQK MOS LQK Version Cumulative Conceal Ratio Interval Conceal Ratio Max Conceal Ratio Conceal Secs Severely Conceal Secs Latency1 Max Jitter Sender Size Sender Reports Received1 Sender Report Time Received1 Rcvr Size Rcvr Discarded Rcvr Reports Received1 Rcvr Report Time Received1 Voice Quality Metrics MOS LQK Avg MOS LQK Description 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 Version of the Cisco proprietary algorithm used to calculate MOS LQK scores. Total number of concealment frames divided by total number of speech frames received from start of the voice stream. 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. Highest interval concealment ratio from start of the voice stream. Number of seconds that have concealment events (lost frames) from the start of the voice stream (includes severely concealed seconds). Number of seconds that have more than 5 percent concealment events (lost frames) from the start of the voice stream. 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. Maximum value of instantaneous jitter, in milliseconds. RTP packet size, in milliseconds, for the transmitted stream. Number of times RTCP Sender Reports have been received. Last time at which an RTCP Sender Report was received. RTP packet size, in milliseconds, for the received stream. RTP packets received from network but discarded from jitter buffers. Number of times RTCP Receiver Reports have been received. Last time at which an RTCP Receiver Report was received. 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 9-15. Note The MOS LQK score can vary based on the type of codec that the Cisco Unified IP Phone uses. Average MOS LQK score observed for the entire voice stream. 8-12 Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0 OL-15299-01