Echo Canceller: To remove acoustic echo from a voice
communication in order to improve the voice quality .
VAD (Voice Activity Detection): Allow IP phone to detect
the presence or absence of human spe
ech during a call.
When detecting period of “silence”, VAD replaces that
silence efficiently with special packets that indicate
silence is occurring. It can facilitate speech processing,
and deactivate some processes during non-speech
section of an audio s
ession. It can avoid unnecessary
coding or transmission of silence packets in VoIP
applications, saving on computation and network
CNG (Comfort Noise Generation): Allow IP phone to
generate comfortable background noise for voice
uring periods of silence in a
conversation. It is a part of the silence suppression or
VAD handling for VoIP technology. CNG, in conjunction
with VAD algorithms, quickly responds when periods of
silence occur and inserts artificial noise until voice
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