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 |
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Attribute | Values | Default | Interpretation |
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voice.codecPref.IP_650.G711M | Null, | 2 | Specifies the codec preferences |
u |
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| for the SoundPoint IP 650 |
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| platform. |
voice.codecPref.IP_650.G711A |
| 3 | |
| 1 = highest | ||
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| |
voice.codecPref.IP_650.G729A |
| 4 | 3 = lowest |
B |
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| Null = do not use |
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voice.codecPref.IP_650.G722 |
| 1 |
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• Audio Profiles <audioProfile/> |
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Attribute | Permitted | Default | Interpretation |
Values | |||
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voice.audioProfile.G722.pay- | 10, 20, | 20 | Preferred Tx payload size in mil- |
loadSize | 30, ... 80 |
| liseconds to be provided in SDP |
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| offers and used in the absence of |
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| ptime negotiations. This is also |
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| the range of supported Rx pay- |
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| load sizes. |
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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 |
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| has been achieved initially, the |
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| depth may fall below this point |
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| and play out will still continue. |
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| This parameter should be set to |
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| the smallest possible value which |
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| is at least two packet payloads, |
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| and larger than the expected short |
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| term average jitter. |
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6 | Copyright © 2006 Polycom, Inc. |
