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G.729 is a toll-quality, low-bandwidth audio codec supported by many VoIP providers. The voice quality of a G.729-encoded call is about the same as that of G.711, the codec used for standard PSTN calls. However, the amount of bandwidth needed to carry a G.729 call is much lower than that for a G.711 call. Enterprises using G.729 will make more efficient use of available network bandwidth. G.729 uses roughly 1/8th of the bandwidth of a G.711 (8 kbit/s vs 64 kbit/s).
DISCLAIMER: This should be considered experimental, as the binary for g729 provided by FreeSwitch is not always compatible with the stable version os sipXecs at every release of the g729 binary.
G.729 is available in two ways:
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