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Voice Coding Algorithms <codecs/>
The following voice codecs are supported:
These codecs include:
• Codec Preferences <codecPref/>
• Codec Profiles <audioProfile/>
Codec Preferences <codecPref/>
Algorithm MIME Type Label Bit Rate
Sample
Rate Frame Size
Effective Audio
Bandwidth
G.711μ-law PMCU G711mu 64 Kbps 8 Ksps 10ms - 80ms 3.5 KHz
G.711a-law PCMA G711A 64 Kbps 8 Ksps 10ms - 80ms 3.5 KHz
G.722 G722/8000 G722 64 Kbps 16 Ksps 10ms - 80ms 7 KHz
G.722.1 G722/16000 G7221 16 Kbps,
24 Kbps,
32 Kbps
16 Ksps 20ms - 80ms 7 KHz
G.729AB G729 G729AB 8 Kbps 8 Ksps 10ms - 80ms 3.5 KHz
Attribute
Permitted
Values Default Interpretation
voice.codecPref.G711Mu Null, 1-3 1 Specifies the codec preferences for
SoundPoint IP 320, 330, 430, 500, 501,
600 and 601 platforms.
1 = highest
3 = lowest
Null = do not use
Give each codec a unique priority, this will
dictate the order used in SDP negotiations.
voice.codecPref.G711A 2
voice.codecPref.G729AB 3
voice.codecPref.IP_300.G711Mu Null, 1-3 1 Specifies the codec preferences for
SoundPoint IP 301 models. Interpretation
as above.
voice.codecPref.IP_300.G711A 2
voice.codecPref.IP_300.G729AB 3
voice.codecPref.IP_650.G711Mu Null, 1-4 2 Specifies the codec preferences for the
SoundPoint IP 550, 560, and 650 platform.
Interpretation as above.
voice.codecPref.IP_650.G711A 3
voice.codecPref.IP_650.G729AB 4
voice.codecPref.IP_650.G722 1