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What is G.729 Codec?

G.729 is a class of codecs with low bandwidth requirements and necessities; it provides good audio quality.

a. The codec encodes audio in frames of 10 ms long. Given a sampling frequency of 8 kHz, a 10 ms frame has 80 audio samples.

b. The codec algorithm encodes each frame into 10 bytes, so the resulting bitrate is 8 kbit/s in one direction.

c. G.729 is a licensed and approved codec. Clients or end users who want to use this codec should buy a hardware that implements it (be it a VoIP phone or gateway).

d. A regularly used version of G.729 is G.729a. It is wire-compatible with the original codec but has lower CPU necessities.

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