Polycom 1725-11530-310 manual Codec Profiles audioProfile

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

Codec Profiles <audioProfile/>

The profile attributes can be adjusted for each of the supported codecs, namely, x= G711A, G711Mu, G722, G7221, G7221C, G729AB, Lin16, and Siren14.

	Permitted
Attribute	Values	Interpretation
voice.audioProfile.x.payloadSize	10, 20, 30, ...80	Preferred Tx payload size in milliseconds to be
		provided in SDP offers and used in the
		absence of ptime negotiations. This is also the
		range of supported Rx payload sizes.
		The payload size for G7221, G7221C, and
		Siren14 are further subdivided.
voice.audioProfile.x.jitterBufferMin	20, 40, 50, 60,	The smallest jitter buffer depth (in milliseconds)
	... (multiple of	that must be achieved before play out begins
	10)	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.
voice.audioProfile.x.jitterBufferShrink	10, 20, 30, ...	The absolute minimum duration time (in
	(multiple of 10)	milliseconds) of RTP packet Rx with no packet
		loss between jitter buffer size shrinks. Use
		smaller values (1000 ms) to minimize the delay
		on known good networks. Use larger values to
		minimize packet loss on networks with large
		jitter (3000 ms).
voice.audioProfile.x.jitterBufferMax	>	The largest jitter buffer depth to be supported
	jitterBufferMin,	(in milliseconds). Jitter above this size will
	multiple of 10,	always cause lost packets. This parameter
	<=300 for IP	should be set to the smallest possible value
	850	that will support the expected network jitter.

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