Polycom Version 2.0.3B manual 6 G.722 Audio Codec, Attribute Values

Administrator’s Guide - SoundPoint® IP / SoundStation® IP Addendum

1.1.6 G.722 Audio Codec

The SoundPoint IP 650 supports the G.722 audio codec.

Changes can be found in the following parameters in the sip.cfg configuration file:

• Codec Preferences <codecPref/>

	Permitted
Attribute	Values	Default	Interpretation
voice.codecPref.IP_650.G711M	Null, 1-3	2	Specifies the codec preferences
u			for the SoundPoint IP 650
			platform.
voice.codecPref.IP_650.G711A		3
			1 = highest
voice.codecPref.IP_650.G729A		4	3 = lowest
B			Null = do not use
voice.codecPref.IP_650.G722		1
• Audio Profiles <audioProfile/>
Attribute	Permitted	Default	Interpretation
	Values
voice.audioProfile.G722.pay-	10, 20,	20	Preferred Tx payload size in mil-
loadSize	30, ... 80		liseconds to be provided in SDP
			offers and used in the absence of
			ptime negotiations. This is also
			the range of supported Rx pay-
			load sizes.
voice.audioProfile.G722.jitter-	20, 40,	40	The smallest jitter buffer depth (in
BufferMin	50, 60, ...		milliseconds) that must be
	(multiple		achieved before play out begins
	of 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.

6 Copyright © 2006 Polycom, Inc.