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The following table describes the audio codecs. If you have Switchvox SMB and you have entered a License key for the G729 Codec in Machine Admin > Digium Addon Products, you will also see G729 in the list of codecs.
Audio Codecs
Codec | Bandwidth |
Usage (kbits/s) | Sound Quality | CPU Usage | |
ULAW | 85 | Great | None |
ALAW | 85 | Great | None |
G722 | 85 | Excellent | Low |
G726 | 54 | Good | Low |
G729 | 30 | Good | Medium |
SPEEX | 33 | Great | High |
GSM | 35 | Good | Low |
ADPCM | 54 | Good | Low |
LPC10 | 22 | Poor | Medium |