Cisco 7965G Administration Guide - Page 157

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 Latency1 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. 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 Received1 Last time at which an RTCP Sender Report was received. 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 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 9-16. 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.722 gives 4.5 • G.728/iLBC gives 3.9 • G.729 A/AB gives 3.8 OL-14641-01 Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.1 8-13