Cisco 7931G Administration Guide - Page 184

Status Menu Chapter 7 Viewing Model Information, Status, and Statistics on the Cisco Unified IP Phone Table 7-5 Call Statistics (continued) Item MOS LQK Avg MOS LQK Min MOS LQK Max MOS LQK MOS LQK Version Cumulative Conceal Ratio Interval Conceal Ratio Description 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 9-21. 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. Lowest MOS LQK score observed from start of the voice stream. 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 3.8 • G.728/iLBC gives 3.9 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. 7-18 Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.0 OL-12457-01