Cisco CP-7961G Administration Guide - Page 183

Chapter 8 Monitoring the Cisco Unified IP Phone Remotely Streaming Statistics Table 8-5 Streaming Statistics Area Items (continued) Item 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 Min MOS LQK Max MOS LQK MOS LQK Version Cmltve Conceal Ratio Interval Conceal Ratio Max Conceal Ratio Conceal Secs Severely Conceal Secs Description 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 Monitoring the Voice Quality of Calls, page 9-15. 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 for the Cisco Unified IP Phones 7962G and 7942G 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 These codecs for the Cisco Unified IP Phones 7961G/G-GE and 7941G/G-GE 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. OL-21011-01 Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP) 8-13