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Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
OL-20861-01
Chapter 10 Viewing Model Information, Status, and Statistics on the Cisco Unified IP Phone
Status Menu
Avg Jitter Estimated average RTP packet jitter (dynamic delay that a packet
encounters when going through the network), in milliseconds, observed
since the receiving voice stream was opened.
Max Jitter Maximum jitter, in milliseconds, observed since the receiving voice
stream was opened.
Rcvr Discarded 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.
Rcvr Lost Packets 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 eight-second interval of the voice stream. For more
information, see the “Monitoring the Voice Quality of Calls” section on
page 12-16.
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.729 A /AB gives 3.7
MOS LQK Version Version of the Cisco proprietary algorithm used to calculate MOS LQK
scores.
Cumulative 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).
Table 10-5 Call Statistics Items for the Cisco Unified Phone (continued)
Item Description