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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.1 (SIP), Cisco Unified IP Phones
OL-11524-01
Chapter7 Viewing Model Information, Status, and Statistics on the Cisco Unified IP Phone
Call Statistics Screen
Table7-5 Call Statistics
Item Description
Sender Packets Total number of RTP data packets transmitted by the phone since starting this
connection. The value is 0 if the connection is set to receive only mode.
Sender Codec Type of audio encoding used for the transmitted stream.
Rcvr Lost Packets Total number of RTP data packets that have been lost since starting receiving
data on this connection. Defined as the number of expected packets less the
number of packets actually received, where the number of received packets
includes any that are late or duplicate. The value displays as 0 if the
connection was set to send-only mode.
Avg Jitter Estimate of mean deviation of the RTP data packet inter-arrival time,
measured in milliseconds. The value displays as 0 if the connection was set
to send-only mode.
Rcvr Codec Type of audio encoding used for the received stream.
Rcvr Packets Total number of RTP data packets received by the phone since starting
receiving data on this connection. Includes packets received from different
sources if this is a multicast call. The value displays as 0 if the connection was
set to send-only mode.
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 page9-20.
Note The MOS LQK score can vary based on the type of codec that the
Cisco UnifiedIP 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