Chapter 8 Viewing Model Information, Status, and Statistics on the Cisco Unified IP Phones

Status Menu

Table 8-6

Call Statistics Items (continued)

 

 

 

Item

 

Description

 

 

 

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

 

 

 

 

 

 

Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)

 

 

 

 

 

 

OL-23091-01

 

 

8-15

 

 

 

 

 

Page 191
Image 191
Cisco Systems 8.6 manual Preceding 8-second interval of the voice stream. For more, That the Cisco Unified IP Phone uses