Polycom SOUNDPOINT SIP 3.1 - Manual (Page 206)

Administrator’s Guide SoundPoint IP / SoundStation IP
A - 52
Voice Activity Detection <vad/>
These settings control the performance of the voice activity detection (silence
suppression) feature.
Quality Monitoring <quality monitoring/>
This attribute includes:
• Central Report Collector <collector/>
• Alert Reports <alert/>
voice.txEq.hf.IP_430.postFilter.enable 1
voice.txEq.hf.IP_500.postFilter.enable 1
voice.txEq.hf.IP_600.postFilter.enable 1
voice.txEq.hf.IP_601.postFilter.enable 1
voice.txEq.hf.IP_650.postFilter.enable 1
voice.txEq.hf.IP_4000.postFilter.enable 0
voice.txEq.hf.IP_6000.postFilter.enable 0
voice.txEq.hf.IP_7000.postFilter.enable 0
Attribute Default
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.
signalAnnexB
0, 1 Null If set to 1 or Null 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, there is no change to SDP.