Comfort Noise Generation

The device can generate artificial background noise, called comfort noise, in the voice channel during periods of silence (i.e. when no call party is speaking) for Gateway calls. This is useful in that it reassures the call parties that the call is still connected. The device detects silence using its Voice Activity Detection (VAD) mechanism. When the Comfort Noise Generation is enabled and silence is detected, the device transmits Silence Identifier Descriptors (SIDs) parameters to reproduce the local background noise at the remote (receiving) side. The Comfort Noise Generation support also depends on the silence suppression (SCE) setting for the coder used in the voice channel. For more information, see the description of the Comfort Noise Generation related parameters.

This feature is applicable only to the Gateway application.

The following procedure describes how to configure Comfort Noise Generation through the Web interface.

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To configure Comfort Noise Generation:

Open the RTP/RTCP Settings page (Setup menu > Signaling & Media menu > Media folder > RTP/RTCP Settings). The relevant parameters are listed under the General group, as shown below:

Set the 'Comfort Noise Generation Negotiation' parameter (ComfortNoiseNegotiation) to Enable.

Click Apply.