Polycom IP 320 Administrator's Manual page 247

Attribute
video.profile.H261.CifMpi
video.profile.H261.QcifMpi
video.profile.H261.annexD
video.profile.H264.jitterBufferMax
video.profile.H264.jitterBufferMin
video.profile.H264.jitterBufferShrink
video.profile.H264.payloadType
video.profile.H264.profileLevel
Permitted
Values Interpretation
1 (default) to 32 This value is H261 format parameter CIF used
to signal Polycom VVX 1500 receiving
capability in SDP.
This value also controls the TX frame size. If
set to 1, CIF is used (provided the far end
supports CIF=1); otherwise QCIF is used.
1 (default) to 32 This value is H261 format parameter QCIF
used to signal Polycom VVX 1500 receiving
capability in the SDP.
0 or 1 This value is H261 format parameter ANNEXD
default Null used to signal Polycom VVX 1500 receiving
capability in the SDP.
(video.profil The largest jitter buffer depth to be supported
(in milliseconds). Jitter above this size will
e.H264.jitter
BufferMin + always cause lost packets. This parameter
500ms) to should be set to the smallest possible value
2500ms, that will support the expected network jitter.
default 2000ms
33ms to The smallest jitter buffer depth (in milliseconds)
1000ms, that must be achieved before play out begins
default 150ms 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.
33ms to The absolute minimum duration time (in
1000ms, milliseconds) of RTP packet Rx with no packet
default 70ms 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).
96 to 127, RTP payload format type for H264/90000
default 109 MIME type.
1, 1b, 1.1, 1.2, This value is H.264's level used in the phone.
1.3 (default) 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.
Configuration Files
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