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What Are Codecs In SIP?

Codec is the abbreviation for coder-decoder which does two basic operations:

1. First, it converts and changes an analog voice signal to its equivalent digital form so that it can be easily transmitted.

2. Afterward, it converts and changes the compressed digital signal back to its original and normal analog form so that it can be replayed.

There are many various codecs available in the market; some are free while others require licensing before you can acquire them. Codecs differ in the sound quality, the bandwidth required, the computational requirements, etc.

Hardware devices such as phones and gateways support several different codecs. When communicate with each other, they negotiate and agree which codec they will use.

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