Polycom IP 320 Administrator's Manual page 246

Administrator's Guide for the SoundPoint IP / SoundStation IP / VVX Family
Attribute
video.codecPref.H261
video.codecPref.H264
video.codecPref.H2631998
video.codecPref.H263
Note
Attribute
video.profile.H261.jitterBufferMax
video.profile.H261.jitterBufferMin
video.profile.H261.jitterBufferShrink
A - 66
Codec Preferences <codecPref/>
Permitted
Values
1 to 4
1 to 4
1 to 4
1 to 4
Codecs with a default of Null are available for test purposes only and are not
expected to be used in your deployment.
Codec Profiles <profile/>
The profile attributes can be adjusted for each of the new supported video
codecs.
Permitted
Values
(video.profil
e.H261.jitter
BufferMin +
500ms) to
2500ms,
default 2000ms
33ms to
1000ms,
default 150ms
33ms to
1000ms,
default 70ms
Default Interpretation
4 Specifies the video codec preferences for
the Polycom VVX 1500 phone.
1
2
3
Interpretation
The largest jitter buffer depth to be supported
(in milliseconds). Jitter above this size will
always cause lost packets. This parameter
should be set to the smallest possible value
that will support the expected network jitter.
The smallest jitter buffer depth (in milliseconds)
that must be achieved before play out begins
for the first time. Once this depth has been
achieved initially, the depth may fall below this
point and play out will still continue. This
parameter should be set to the smallest
possible value which is at least two packet
payloads, and larger than the expected short
term average jitter.
The absolute minimum duration time (in
milliseconds) of RTP packet Rx with no packet
loss between jitter buffer size shrinks. Use
smaller values (33 ms) to minimize the delay
on known good networks. Use larger values
(1000ms) to minimize packet loss on networks
with large jitter (3000 ms).