Coder-decore in short called as a codec is used for two simple operations –
There are free and licensing codecs available in the market. Each of them differ in the sound quality and bandwidth.
Hardware devices (like phones and gateways) negotiate the codec they will use because they support many different codecs.
G.711 was introduced by ITU in 1972 as a codec for digital telephony use. It has two variants : A-Law and uLaw. A-Law is used in Europe and international telephone links whereas uLaw is used in Japan and USA.
A codec with a low bandwidth requirement which provides good audio quality is G.729.
The results of the competition that was announced to design a codec which allows the calls over 28.8 and 33 kbit/s modem links is G.723.1.
The codec that is designed for the GSM mobile networks is GSM 06.10, which is also known as GSM Full Rate.
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