Cisco 6821 Administration Guide

DescriptionParameter
Number of milliseconds for decoder latency.Decode Latency
Number of milliseconds for receiver jitter.Jitter
Number of milliseconds for delay in the RTP-to-RTP
interface round trip.
Round Trip Delay
Number of packets lost.Packets Lost
The fraction of RTP data packets from the source lost
since the beginning of reception. Defined in
RFC-3611—RTP Control Protocol Extended Reports
(RTCP XR).
Loss Rate
The fraction of RTP data packets from the source lost
since the beginning of reception. Defined in
RFC-3611—RTP Control Protocol Extended Reports
(RTCP XR).
Packet Discarded
The fraction of RTP data packets from the source that
have been discarded since the beginning of reception,
due to late or early arrival, under-run or overflow at
the receiving jitter buffer. Defined in
RFC-3611—RTP Control Protocol Extended Reports
(RTCP XR).
Discard Rate
The mean duration, expressed in milliseconds, of the
burst periods that have occurred since the beginning
of reception. Defined in RFC-3611—RTP Control
Protocol Extended Reports (RTCP XR).
Burst Duration
The mean duration, expressed in milliseconds, of the
gap periods that have occurred since the beginning of
reception. Defined in RFC-3611—RTP Control
Protocol Extended Reports (RTCP XR).
Gap Duration
Voice quality metric that describes the segment of the
call that is carried over this RTP session. Defined in
RFC-3611—RTP Control Protocol Extended Reports
(RTCP XR).
R-Factor
The estimated mean opinion score for listening quality
(MOS-LQ) is a voice quality metric on a scale from
1 to 5, in which 5 represents excellent and 1 represents
unacceptable. Defined in RFC-3611—RTP Control
Protocol Extended Reports (RTCP XR).
MOS-LQ
The estimated mean opinion score for conversational
quality (MOS-CQ) is defined as including the effects
of delay and other effects that affect conversational
quality. Defined in RFC-3611—RTP Control Protocol
Extended Reports (RTCP XR).
MOS-CQ
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
214
Phone Troubleshooting
Line Call Status

Cisco 6821 Specifications

General

Resolution	320 x 240 pixels
Speakerphone	Yes
Headset Port	Yes
Protocols	SIP
USB Port	No
Wireless	No
Bluetooth	No
Video Support	No
Conference Capabilities	Yes
Wall Mountable	Yes
Display	3.5-inch grayscale
Ethernet	10/100 Ethernet
Line Keys	2
PoE	IEEE 802.3af Power over Ethernet (PoE)
Codecs	G.711, G.722, G.729, iLBC
Weight	2.0 lb (0.91 kg)