Voice Activity Detection Parameters

The following table lists the parameters you can use to configure Voice Activity Detection.

Table 1. Voice Activity Detection Parameters

Template

Parameter

Permitted Values

Change Causes

Restart or Reboot

site.cfg

voice.vad.signalAnnexB

0—There is no change to SDP. If voice.vadEnable is set to 0, add parameter line a=fmtp:18 annexb="no" below the a=rtpmap … parameter line (where “18” could be replaced by another payload).

1 (default)—Annex B is used and a new line is added to SDP depending on the setting of voice.vadEnable . If voice.vadEnable is set to 1, add parameter line a=fmtp:18 annexb="yes" below a=rtpmap … parameter line (where '18' could be replaced by another payload).

No

site.cfg

voice.vadEnable

0 - Disable Voice activity detection (VAD).

1 - Enable VAD.

No

site.cfg

voice.vadThresh

The threshold for determining what is active voice and what is background noise in dB.

25 (default)

Integer from 0 - 30

Sounds louder than this value are considered active voice, and sounds quieter than this threshold are considered background noise. This does not apply to G.729AB codec operation which has its own built-in VAD function.

No