Polycom SIP 3.1 Administrator's Manual page 206

Administrator's Guide SoundPoint IP / SoundStation IP
Attribute
voice.txEq.hf.IP_430.postFilter.enable
voice.txEq.hf.IP_500.postFilter.enable
voice.txEq.hf.IP_600.postFilter.enable
voice.txEq.hf.IP_601.postFilter.enable
voice.txEq.hf.IP_650.postFilter.enable
voice.txEq.hf.IP_4000.postFilter.enable
voice.txEq.hf.IP_6000.postFilter.enable
voice.txEq.hf.IP_7000.postFilter.enable
Attribute
voice.vadEnable
voice.vadThresh
voice.vad.
signalAnnexB
A - 52
Voice Activity Detection <vad/>
These settings control the performance of the voice activity detection (silence
suppression) feature.
Permitted
Values Default
0, 1 0
integer from 0 15
to 30
0, 1 Null
Quality Monitoring <quality monitoring/>
This attribute includes:
• Central Report Collector <collector/>
• Alert Reports <alert/>
Interpretation
If set to 1, enable VAD.
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.
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.
Default
1
1
1
1
1
0
0
0