Comfort Noise Generation - AudioCodes Mediant 3000 User Manual

User's Manual
The procedure below describes how to configure the jitter buffer using the Web interface.

To configure jitter buffer using the Web interface:
1. Open the RTP/RTCP Settings page (Configuration tab > VoIP menu > Media
submenu > RTP/RTCP Settings). The relevant parameters are listed under the
'General Settings' group, as shown below:
Figure 13-6: Jitter Buffer Parameters in the RTP/RTCP Settings Page
2. Set the 'Dynamic Jitter Buffer Minimum Delay' parameter (DJBufMinDelay) to the
minimum delay (in msec) for the Dynamic Jitter Buffer.
3. Set the 'Dynamic Jitter Buffer Optimization Factor' parameter (DJBufOptFactor) to the
Dynamic Jitter Buffer frame error/delay optimization factor.
4. Click Submit to apply your settings.

13.3.2 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). 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 Calling Tone (CNG) 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 (CNG) 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 CNG-related parameters.
The procedure below describes how to configure CNG using the Web interface.

To configure CNG using the Web interface:
1. Open the RTP/RTCP Settings page (Configuration tab > VoIP menu > Media
submenu > RTP/RTCP Settings). The relevant parameters are listed under the
'General Settings' group, as shown below:
Figure 13-7: Comfort Noise Parameter in RTP/RTCP Settings Page
2. Set the 'Comfort Noise Generation Negotiation' parameter (ComfortNoiseNegotiation)
to Enable.
3. Click Submit to apply your changes.
Version 6.6 183
13. Media
Mediant 3000