Installation & Maintenance Manual 18. Configuring Comfort Noise and Gain Control
Version 6.8 167 Microsoft Lync Server
18 Configuring Comfort Noise and Gain
Control
The Lync network provides high voice quality by implementing 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 configure the
PSTN Gateway to match these voice quality features, by enabling silence suppression,
comfort noise generation, automatic gain control (AGC), and echo canceller (enabled by
default).
Note: Silence suppression is configured
per coder type, as described in
Section 0 on page 165.
To configure voice quality:
1. Open the RTP/RTCP Settings page (Configuration tab > VoIP menu > Media >
RTP/RTCP Settings).
Figure 18-1: RTP/RTCP Settings Page
2. From the ‘Comfort Noise Generation Negotiation’ drop-down list, set Enable to enable
comfort noise generation.
3. From the ‘Enable RFC 3389 CN payload Type’ drop-down list, verify Enable
4. Click Submit.
5. On the toolbar, click Burn to save the changes to the PSTN gateway flash memory.
6. Open the 'IPMedia Settings' page (Configuration tab > VoIP menu > Media >
IPMedia Settings).
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