Cisco 7925G - Unified Wireless IP Phone VoIP Administration Manual page 181

Chapter 8 Viewing Security, Device, Model, Status, and Call Statistics Information on the Phone
Table 8-6
Item
Sender Packets
Avg Jitter (value1/value2)
Max Jitter
Rcvr Discarded
Rcvr Lost Packets
Voice Quality Metrics
MOS LQK
Avg MOS LQK
Min MOS LQK
Max MOS LQK
MOS LQK Version
CumConcealRatio
Cisco Unified Wireless IP Phone 7925G Administration Guide for Cisco Unified Communications Manager 7.0(1)
OL-15984-01
Call Statistics Items (continued)
Description
Number of RTP voice packets transmitted since voice stream was
opened.
Note
Estimated average RTP packet jitter (dynamic delay that a packet
encounters when going through the network).
• Value 1 is the average jitter in milliseconds (ms).
Value 2 is the current audio frame buffer depth in millisecond
•
(ms).
Maximum jitter observed since the receiving voice stream was
opened.
Number of RTP packets in the receiving voice stream that have been
discarded (bad packets, too late, and so on).
Note
Missing RTP packets (lost in transit).
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
section on page
Note
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 3.7
•
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.
This number is not necessarily identical to the number of
RTP voice packets transmitted since the call began because
the call might have been placed on hold.
The phone will discard payload type 19 comfort noise
packets that are generated by Cisco Gateways, which will
increment this counter.
"Monitoring the Voice Quality of Calls"
10-12.
The MOS LQK score can vary based on the type of codec
that the Cisco Unified IP Phone uses.
Viewing the Phone Status Menu
8-15