Polycom SoundPoint IP 600 SIP Administrator's Manual page 75

Administrator Guide - SoundPoint
4.6.1.6.1.1 Codec Preferences <preferences/>
Attribute
voice.codecPref.G711Mu
voice.codecPref.G711A
voice.codecPref.G729AB
4.6.1.6.1.2 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
®
IP SIP
Permitted
Values
Null, 1-3
Null, 1-3
Null, 1-3
Permitted
Values
10, 20, 30,
...80
40, 50, 60, ...
(multiple of
10)
Copyright © 2004 Polycom, Inc
Default Interpretation
1 Specifies the codec preference.
1=highest
2
3=lowest
3
Null=do not use
Give each codec a unique priority, this
will dictate the order used in SDP
negotiations.
Note: If less than two codecs are speci-
fied, SoundPoint
cally use G711Mu and G711A with
default parameters.
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.
Optimizing SoundPoint
®
IP will automati-
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