Return Code When Refuse: Allows user to assign specific
code as return code to SIP server when an incoming call
is rejected.
Auto Answer Delay: To configure delay time before an
incoming call is automatically answered.
Early DTMF: To enable or disable early DTMF
Path: Web UI->Phone->Voice
Sections Description
Echo Canceller 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 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
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