Cisco OL-21011-01 - Manual (Page 13)

8-13
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP)
OL-21011-01
Chapter 8 Monitoring the Cisco Unified IP Phone Remotely
Streaming Statistics
Sender Size RTP packet size, in milliseconds, for the transmitted stream.
Sender Reports Received 1 Number of times RTCP Sender Reports have been received.
Sender Report Time
Received
1
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 Received 1 Number of times RTCP Receiver Reports have been received.
Rcvr Report Time Received 1 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
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.
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 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
MOS LQK Version Version of the Cisco proprietary algorithm used to calculate MOS LQK scores.
Cmltve 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.
Table 8-5 Streaming Statistics Area Items (continued)
Item Description