Avaya
4600 Series Administrator's Manual page 58

4600 Series IP Telephone LAN Administrator's Guide
For 4620 and 4630/4630SW IP Telephones, the following parameters are displayed in real-time to
users on the appropriate screens, while on a call:
Table 4-4. Parameters in Real-Time
Parameter
Audio Connection
Present?
Received Audio
Coding
Silence Suppression
Packet Loss
Packetization Delay
One-way Network
Delay
Network Jitter
Compensation Delay
For the 4606, 4612, and 4624 IP Telephones, the Network Audio Quality Screen presents the user
with a qualitative assessment of the overall audio quality currently being experienced. This
assessment is based on separate evaluations of the Packet Loss and the total Network Delay (the
sum of Packetization Delay, One-way Network Delay, and Network Jitter Compensation Delay),
and consideration of the codec in use. You can disable the display of the Network Audio Quality
data and assessment for all sets by setting the system value NTWKAUDIO to a value of "0" as
explained in Administering Options for the 4600 Series IP Telephones, on page
The implication of this information for LAN administration depends, of course, on the values
reported by the user and the specific nature of your LAN (topology, loading, QoS administration,
etc.). The major use for this information is to give the user an idea of how network conditions are
affecting the audio quality of the current call. It is assumed you have more detailed tools available
for troubleshooting the LAN.
QoS
4-26
Possible Values
Yes (if a receive RTP stream has been established)
No (if a receive RTP stream has not been established)
G.711 or G.729
Yes (if the telephone knows the far-end has silence suppression
Enabled)
No (if the telephone knows the far-end has silence suppression
Disabled, or the telephone does not know either way)
"No data" or a decimal percentage. Late and out-of-sequence
packets are counted as lost if they are discarded. Packets are not
counted as lost until a subsequent packet is received and the loss
confirmed by the RTP sequence number.
"No data" or an integer number of milliseconds. The number
reflects the amount of delay in received audio packets, and
includes any look-ahead delay associated with the codec.
"No data" or an integer number of milliseconds. The number is
one-half the value RTCP computes for the round-trip delay.
"No data" or an integer number of milliseconds reporting the
average delay introduced by the telephone's jitter buffer.
4-28.