The codec in use with VoIP communications refers to the algorithm used to compress and encapsulate data so that it can travel over the Internet and be reassembled with minimal disruption and best possible voice quality. Different codecs exist to accommodate a wide variation of conditions, such as bandwidth and processing power of the equipment doing the real-time compression/decompression. The codecs we support are G.711 (μ-law / pcmu) , G.729 and GSM. Here is their bit rate and bandwidth requirements, both in Kbps:
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