Cisco 6941 Administration Guide - Page 139

Chapter Streaming Statistics Table 8-5 Streaming Statistics Area Items (continued) Item Description Max Jitter Maximum value of instantaneous jitter, in milliseconds. Sender Size Sender Reports Received1 RTP packet size, in milliseconds, for the transmitted stream. Number of times RTCP Sender Reports have been received. Sender Report Time Received1 Last time at which an RTCP Sender Report was received. Rcvr Size RTP packet size, in milliseconds, for the received stream. Rcvr Discarded Rcvr Reports Received1 Rcvr Report Time Received1 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. 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. Latency 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. MOS LQK Objective estimate of the Mean Opinion Score (MOS) for Listening Quality (LQK) that ranks audio quality from 5 (excellent) to 1 (bad). This score is based on audible-concealment events due to a frame loss in the preceding 8 seconds of the voice stream. 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 for the entire voice stream. Min MOS LQK Lowest MOS LQK score from the start of the voice stream. Max MOS LQK Baseline or highest MOS LQK score from the start of the voice stream. The following codecs provide the corresponding maximum MOS LQK scores under normal conditions with no frame loss: • G.711: 4.5 • G.722: 4.5 • G.728/iLBC: 3.9 • G729A/AB: 3.7 MOS LQK Version Version of the Cisco-proprietary algorithm used to calculate the MOS LQK scores. 1. When the RTP Control Protocol is disabled, no data generates for this field and thus displays as 0. Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP) OL-23769-01 8-11