Polycom SoundPoint IP 300 Administrator's Manual page 117

Administrator's Guide - SoundPoint
Attribute
voice.codecPref.IP_300.G711Mu
voice.codecPref.IP_300.G711A
voice.codecPref.IP_300.G729AB
voice.codecPref.IP_4000.G711Mu
voice.codecPref.IP_4000.G711A
voice.codecPref.IP_4000.G729AB
4.6.1.8.1.2 Codec Profiles <profiles/>
The following profile attributes can be adjusted for each of the three supported codecs.
In the table, x=G711Mu, G711A, or G729AB.
Attribute
voice.audioProfile.x.payloadSize
voice.audioProfile.x.jitterBufferMin
voice.audioProfile.x.jitterBufferShrink
® ®
IP / SoundStation IP
Permitted
Values
Null, 1-3
Null, 1-3
Permitted
Values
10, 20, 30,
...80
20, 40, 50,
60, ... (multi-
ple of 10)
10, 20, 30, ...
(multiple of
10)
Copyright © 2006 Polycom, Inc.
Default Interpretation
1 Specifies the codec preferences for
®
SoundPoint IP 300 and 301 plat-
2
forms. Interpretation as above.
3
1 Specifies the codec preferences for
the SoundStation
2
Interpretation as above.
Null Not supported by default so that
G.711Mu and G.711A local confer-
ences can be supported. This restric-
tion will be removed in a future
release.
Interpretation
Preferred Tx payload size in millisec-
onds to be provided in SDP offers and
used in the absence of ptime negotia-
tions. This is also the range of supported
Rx payload sizes.
The smallest jitter buffer depth (in milli-
seconds) 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 pay-
loads, and larger than the expected short
term average jitter. The IP4000 values
are the same as the IP30x values.
The absolute minimum duration time (in
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 net-
works. Use larger values to minimize
packet loss on networks with large jitter
(3000 ms).
Optimization
®
IP 4000 platform.
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