In certain situations or scenarios it may be preferable to change the factory default of comfort noise utilizing a Microsoft Lync or Skype for Business Server.
UC Software 5.4.2 or later added the below.
|
Parameter Recommendation
|
Parameter Range
|
Default Value
|
Result
|
|
|
voice.cn.hs.enable="1"
|
0 or 1
|
0
|
Enables the in-band comfort noise fill
|
|
|
voice.cn.hs.attn="35"
|
90 to -90
|
0
|
Sets the in-band comfort noise attenuation (lower numbers are louder, we suggest no lower / louder than 35)
|
|
|
voice.vadEnable="0"
|
0 or 1
|
0
|
Disables VAD Tx – VAD Rx CNG packets will still be properly received to synthesize local comfort noise
|
|
|
voice.vadRxGain="10"
|
20 to -20
|
0
|
Boosts the VAD CNG synthesis level by 10 dB – subjectively matches the customer site RTP capture
|
|
|
voice.vadTxGain="-10"
|
20 to -20
|
0
|
Reduces the VAD CNG packet payload value by 10 dB – effectively prevents the synthesis boost in voice.vadRxGain from changing the level in a VVX to VVX call
|
|
|
voice.vadRxGain == -voice.vadTxGain
|
|
Restores default behavior
|
|
|
G.722 calls, vadTxGain and vadRxGain have no effect (expected)
|
|
|
|
voice.plcCnEnable="1"
|
0 or 1
|
0
|
Enables local comfort noise generation when far end stops sending RTP and no CN packet is sent
|
|
|
voice.plcCnGain="0"
|
20 to -20
|
0
|
Changes the loudness of local comfort noise generation when voice.plcCnEnable is set to 1
|
|
----------------
The title Polycom Employee & Community Manager is a community setting and does not reflect my role. I am just a simple volunteer in the community like everybody else. My official "day" Job is 3rd Level support at Poly but I am unable to provide official support via the community.
----------------
Notice: This community forum is not an official Poly support resource, thus responses from Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge. If you need immediate and/or official assistance please open a service ticket through your proper support channels.
Please also ensure you always check the VoIP , Video Endpoint , Skype for Business , PSTN or RPM FAQ's
