User's Manual

Configuration 289
If you experience broken or choppy speech at either
end of the call, or the dial tone sounds choppy, use
the volume controls on the MVC 2050 toolbar to adjust
volume while using the MVC 2050.
If you experience reduced audio clarity in the receive
audio stream, increase the Audio clarity setting. This
increases the number of audio buffers used to process
incoming audio. If the delay is too large, you can
decrease the Audio clarity setting.
Advanced Audio
Global IP Sound NetEQ software provides loss concealment and
compensation.
NetEQ is the default setting and MVC 2050 Advanced Audio settings
cannot be adjusted.
Table 39 "Advanced Audio screen" (page 289) provides information about
the Advanced Audio screen.
Table 39
Advanced Audio screen
Selection
Description
NetEQ (Global IP Sound) NetEQ packet loss concealment software
is the default mode of operation.
Jitter Buffer A Jitter Buffer is used to minimize a
change in rate for arriving voice frames.
The Jitter Buffer sends voice frames to
your PDA sound system at a fixed rate.
The rate of arrival of voice frames is
variable. The value of "jitter" is the normal
number of voice frames the application
should have in its jitter buffer.
Highwater Mark Highwater Mark indicates the maximum
number of voice frames the application
should have in its jitter buffer before it
starts discarding packets. This value
should be at least 2.5 times the value of
jitter. If a smaller value is assigned, MVC
2050 regards it as an error and corrects it.
Early Packet and Late Packet
Resync
Early Packet Resync and Late Packet
Resync indicate the points at which MVC
2050 discards and restarts the jitter buffer
contents. This value should be at least five
times the Highwater Mark.
Nortel Communication Server 1000
IP Phones Fundamentals
NN43001-368 02.07
5 February 2009
Copyright © 2003-2009 Nortel Networks
.