Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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Phone User Interface:
None
To configure AEC via web user interface:
1. Click on Settings->Voice.
2. Select the desired value from the pull-down list of ECHO.
3. Click Confirm to accept the change.
Background noise suppression (BNS) is designed primarily for hands-free operation and
reduces background noise to enhance communication in noisy environments.
Automatic Gain Control (AGC) is applicable to hands-free operation and is used to
keep audio output at nearly a constant level by adjusting the gain of signals in certain
circumstances. This increases the effective user-phone radius and helps with the
intelligibility of talkers.
Voice Activity Detection (VAD) is used in speech processing to detect the presence or
absence of human speech. 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. VAD can avoid unnecessary coding or transmission of silence packets in
VoIP applications, saving on computation and network bandwidth.
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