User's Manual

8-15
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-23091-01
Chapter 8 Viewing Model Information, Status, and Statistics on the Cisco Unified IP Phones
Status Menu
Sender Size Size of voice packets, in milliseconds, in the transmitting voice
stream.
Rcvr Packets Number of RTP voice packets received since voice stream was
opened.
Note This number is not necessarily identical to the number of
RTP voice packets received since the call began because the
call might have been placed on hold.
Sender Packets Number of RTP voice packets transmitted since voice stream was
opened.
Note 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.
Avg Jitter 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 Jitter Maximum jitter 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 discards payload type 19 comfort noise packets
that are generated by Cisco Gateways, which 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 8-second interval of the voice stream. For more
information, see
Monitoring the Voice Quality of Calls, page 9-15.
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.722 gives 4.5
• G.728/iLBC gives 3.9
• G.729 A/AB gives 3.8
Table 8-6 Call Statistics Items (continued)
Item Description