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Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones
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Parameter Permitted Values Default
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