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
on page
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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