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Administrator’s Guide - SoundPoint
®
IP / SoundStation
®
IP Addendum
6 Copyright © 2006 Polycom, Inc.
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/>
• Audio Profiles <audioProfile/>
Attribute
Permitted
Values
Default Interpretation
voice.codecPref.IP_650.G711M
u
Null, 1-3 2 Specifies the codec preferences
for the
SoundPoint IP 650
platform.
1 = highest
3 = lowest
Null = do not use
voice.codecPref.IP_650.G711A 3
voice.codecPref.IP_650.G729A
B
4
voice.codecPref.IP_650.G722
1
Attribute
Permitted
Values
Default Interpretation
voice.audioProfile.G722.pay-
loadSize
10, 20,
30, ... 80
20 Prefe
rred Tx payload size in mil-
liseconds to be provided in SDP
offe
rs and used in the absence of
ptime negotiations. This is also
the range of supported Rx pay-
load sizes.
voice.audioProfile.G722.jitter-
BufferMin
20, 40,
50, 60, ...
(multiple
of 10
)
40 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.