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Voice Activity Detection <vad/>
These settings control the performance of the voice activity detection (silence
suppression) feature.
Quality of Service <QOS/>
These settings control the Quality of Service (QOS) options.
This attribute includes:
• Ethernet IEEE 802.1p/Q <ethernet/>
• IP TOS <IP/>
Ethernet IEEE 802.1p/Q <ethernet/>
The following settings control the 802.1p/Q user_priority field:
• RTP <RTP/>
• Call Control <callControl/>
• Other <other/>
Attribute
Permitted
Values Default Interpretation
voice.vadEnable 0, 1 0 If set to 1, enable VAD.
voice.vadThresh integer from 0
to 30
15 The threshold for determining what is active voice and
what is background noise in dB. This does not apply to
G.729AB codec operation which has its own built-in VAD
function.
voice.vad.signalAnnex
B
0, 1 Null If set to 1 and
voice.vadEnable
is set to 1, Annex B is
used. A new line can be added to SDP depending on the
setting of this parameter and the
voice.vadEnable
parameter.
• If
voice.vadEnable
is set to 1, add attribute line
a=fmtp:18 annexb="yes" below a=rtpmap… attribute
line (where '18' could be replaced by another
payload).
• If
voice.vadEnable is set to 0
, add attribute line
a=fmtp:18 annexb="no" below a=rtpmap… attribute
line (where '18' could be replaced by another
payload).
If set to 0 or Null, there is no change to SDP.