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What is G.711 Codec?

G.711 is an audio codec that was introduced by ITU in 1972 for use in digital telephony. The codec has two versions: A-Law is being used in Europe and in international telephone links; u-Law is used in the U.S.A. and Japan.

1. G.711 uses a logarithmic compression. It compresses and squeezes each 16-bit sample to 8 bits, thus it achieves a compression ratio of 1:2.

2. The bitrate is 64 kbit/s for one direction, so a call consumes 128 kbit/s.

3. G.711 is the same codec used by the PSTN networks; therefore it provides the best voice quality. On the other hand, it consumes more bandwidth than other codecs.

4. It works best in local area networks where lots of bandwidth is available.

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