Polycom SIP 2.2.0 ユーザーズマニュアル

 Configuration Files

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These settings control the performance of the voice activity detection (silence 

suppression) feature.

These settings control the Quality of Service (QOS) options.

This attribute includes:

The following settings control the 802.1p/Q user_priority field:

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.