Cisco Systems 8.6 manual Preceding 8-second interval of the voice stream. For more

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