Answer Posted / prasad reddy

A codec (Coder/Decoder) converts analog signals to a
digital bitstream, and another identical codec at the far
end of the communication converts the digital bitstream
back into an analog signal.

In the VoIP world, codec's are used to encode voice for
transmission across IP networks.

Codec's for VoIP use are also referred to as vocoders,
for "voice encoders".

Codecs generally provide a compression capability to save
network bandwidth. Some codecs also support silence
suppression, where silence is not encoded or transmitted.
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