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FreeSWITCH 1.6 Cookbook by Giovanni Maruzzelli, Michael S Collins, Anthony Minessale II

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Codec configuration

Codec configuration is very versatile in FreeSWITCH. In IP telephony, there are several differing scenarios for negotiating and choosing codecs. To meet the varying demands, FreeSWITCH has several configurable modes of operation as well as runtime variables that can influence how codec negotiation takes place. Typically, the goal should be to reduce transcoding or resampling as much as possible. Transcoding is the case where two sides of the call have different codecs and audio flowing in either direction, which has to be completely decoded and re-encoded to the opposite channel's format. Resampling is similar, but it is required when each side of the call is running at a different sample rate, and the audio has to be "resampled" ...

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