Polycom 1725-11530-310 manual Codec Profiles codecPref, Video.profil, H264.jitter, BufferMin +

Administrator’s Guide Addendum for the Polycom VVX 1500 Business Media Phone

Codec Profiles <codecPref/>

The profile attributes can be adjusted for each of the new supported video codecs.

	Permitted
Attribute	Values	Interpretation
video.profile.H264.jitterBufferMax	(video.profil	The largest jitter buffer depth to be supported
	e.H264.jitter	(in milliseconds). Jitter above this size will
	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
video.profile.H264.jitterBufferMin	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.
video.profile.H264.jitterBufferShrink	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).
video.profile.H264.payloadType	96 to 127,	RTP payload format type for H264/90000
	default 109	MIME type.
video.profile.H264.profileLevel	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.
video.profile.H263.jitterBufferMax	(video.profil	The largest jitter buffer depth to be supported
	e.H263.jitter	(in milliseconds). Jitter above this size will
	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

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