
Chapter 5 Configuring VoIP trunks 61
IP Telephony Configuration Guide
Setting silence compression
This section explains how to set silence compression on VoIP trunks.
The silence compression feature identifies periods of silence in a conversation, and stops sending
IP speech packets during those periods. In a typical phone conversation, most of the conversation
is half-duplex, meaning that one person is speaking while the other is listening. If silence
compression is enabled, no voice packets are sent from the listener end. This greatly reduces
bandwidth requirements.
G.723.1 and G.729 support silence compression. If a conversation is using G.711, silence
compression does not occur.
To set the silence compression:
1 In Unified Manager, click on the keys beside Services, IP Telephony.
2 Click on H.323 trunks.
3 Click on the Media Parameters tab. The Media Parameters dialog appears.
Refer to Figure 16.
Figure 16 Media Parameters
4 Click the Silence Compression drop-down menu, and select either Enabled or Disabled.
If you select Enabled, silence compression is only used when a G.729 or G.723.1 codec is in
use.
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