Cisco IP Phone Administration Manual page 191

Chapter 8 Viewing Model Information, Status, and Statistics on the Cisco Unified IP Phones
Table 8-6
Item
Sender Size
Rcvr Packets
Sender Packets
Avg Jitter
Max Jitter
Rcvr Discarded
Rcvr Lost Packets
Voice Quality Metrics
MOS LQK
Avg MOS LQK
Min MOS LQK
Max MOS LQK
OL-23091-01
Call Statistics Items (continued)
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
Description
Size of voice packets, in milliseconds, in the transmitting voice
stream.
Number of RTP voice packets received since voice stream was
opened.
This number is not necessarily identical to the number of
Note
RTP voice packets received since the call began because the
call might have been placed on hold.
Number of RTP voice packets transmitted since voice stream was
opened.
This number is not necessarily identical to the number of
Note
RTP voice packets transmitted since the call began because
the call might have been placed on hold.
Estimated average RTP packet jitter (dynamic delay that a packet
encounters when going through the network) observed since the
receiving voice stream was opened.
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).
The phone discards payload type 19 comfort noise packets
Note
that are generated by Cisco Gateways, which increment this
counter.
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 Monitoring the Voice Quality of Calls, page
The MOS LQK score can vary based on the type of codec
Note
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 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
•
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