Polycom SoundPoint IP 601 - Manual (Page 360)

Administrator’s Guide Addendum for the Polycom VVX 1500 Business Media Phone
1 - 13
Codec Profiles <codecPref/>
The profile attributes can be adjusted for each of the new supported video
codecs.
Attribute
Permitted
Values
Interpretation
video.profile.H264.jitterBufferMax (video.profil
e.H264.jitter
BufferMin +
500ms) to
2500ms,
default 2000ms
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.
video.profile.H264.jitterBufferMin 33ms to
1000ms,
default 150ms 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.
video.profile.H264.jitterBufferShrink 33ms to
1000ms,
default 70ms 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).
video.profile.H264.payloadType 96 to 127,
default 109 RTP payload format type for H264/90000
MIME type.
video.profile.H264.profileLevel 1, 1b, 1.1, 1.2,
1.3 (default) This value is H.264's level used in the phone.
The Level is a constraint set to selected key
algorithm parameters, codec in different level
has different ability, at this time Polycom VVX
1500 support these level (1,1b,1.1,1.2,1.3), as
to detailed level definition. For more
information, refer to ITU-T H.264.
video.profile.H263.jitterBufferMax (video.profil
e.H263.jitter
BufferMin +
500ms) to
2500ms,
default 2000ms
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.