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Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)
OL-15498-01
Chapter 6 Viewing Model Information, Status, Statistics, and Security Information on the Cisco Unified IP Phone
Call Statistics Screen
Avg Jtr Estimated average RTP packet jitter (dynamic delay that a packet
encounters when going through the network) observed since the receiving
voice stream was opened.
Max Jtr Maximum jitter observed since the receiving voice stream was opened.
RxDisc Number of RTP packets in the receiving voice stream that have been
discarded (bad packets, too late, and so on).
Note The phone will discard payload type 19 comfort noise packets that
are generated by Cisco Gateways, which will increment this counter.
RxLost Missing RTP packets (lost in transit).
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 8-15.
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.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 6-4 Call Statistics Items (continued)
Item Description