PLANET VIP-1010PT - Manual (Page 56)

High Definition PoE IP Phone (1-Line)
VIP-1010PT
- 56 -
5.11 Phone / Voice
Voice Configuration
Field Name
Explanation
Echo Canceller Echo Canceller: To remove acoustic echo from a voice
communication in order to improve the voice quality.
VAD (Voice Activity Detection): Allows IP phone to detect
the presence or absence of human speech 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 session. It can avoid unnecessary
coding or transmission of silent packets in VoIP
applications, saving on computation and network
bandwidth.
CNG (Comfort Noise Generation): Allows IP phone to
generate comfortable background noise for voice
communications during 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 activity
resumes. The insertion of artificial noise gives the illusion
of a constant transmission stream, so that background