Version 7.2 191 Mediant 1000B Gateway & E-SBC
User's Manual 14. Media
3. Set the 'Dynamic Jitter Buffer Optimization Factor' parameter (DJBufOptFactor) to the
Dynamic Jitter Buffer frame error/delay optimization factor.
4. Click Apply.
14.3.2 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) 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 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 following procedure describes how to configure CNG through the Web interface.
To configure CNG:
1. 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:
Figure 14-10: Comfort Noise Parameter in RTP/RTCP Settings Page
2. Set the 'Comfort Noise Generation Negotiation' parameter (ComfortNoiseNegotiation)
to Enable.
3. Click Apply.
Note: This feature is applicable only to the Gateway application.
14.3.3 Configuring DTMF Transport Types
The device supports various methods for transporting DTMF digits over the IP network to
the remote endpoint. The methods and their configuration can be configured on the DTMF
& Dialing page (Setup menu > Signaling & Media tab > Gateway > DTMF &
Supplementary > DTMF & Dialing):
Figure 14-11: Configuring DTMF Transport
Using INFO message according to Nortel IETF draft: DTMF digits are sent to the
remote side in INFO messages. To enable the mode:
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