Configuration Note 5. Configuring the E-SBC Device
Version 1.0 Issue 1.0 51 October 2011
5.6.1 Step 7: Define Silence Suppression and Comfort Noise
Overall voice quality has been significantly improved for the Microsoft Lync 2010
environment. These improvements include suppression of typing noise during calls
and improved generation of ’comfort noise’ which reduces hissing and smoothes over
the discontinuous flow of audio packets. You may need to modify the Silence
Suppression and Comfort Noise parameters to achieve this goal. Note that the Echo
Canceller is enabled by default.
¾ To configure silence suppression parameters:
1. Silence Suppression is configured per coder type (see Section
5.6 on page 49 to
enable Silence Suppression per coder.)
2. Open the 'RTP/RTCP Settings' page (Configuration tab > Media menu > RTP /
RTCP Settings).
Figure 5-18: RTP/RTCP Settings Page
3. From the ‘Comfort Noise Generation Negotiation’ drop-down list, select 'Enable’.
This action enables negotiation and usage of Comfort Noise (CN).
4. Default ‘RTP Base UDP Port’ is ‘6000’. As seen here, it is set to ‘16400’ to
demonstrate that the RTP port range can be changed to support specific network
requirements for managed traffic.
5. Click Submit.
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