
Chapter 4 VoIP Trunk Configuration 55
IP Telephony Configuration Guide
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, open Services, IP Telephony, and click on H.323 trunks.
2 Click on the Media Parameters tab. The Media Parameters dialog appears:
Figure 19 Media Parameters
3 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.
Setting Jitter Buffers
This section explains how to select the jitter buffer size used on VoIP trunks.
Jitter buffers are explained in detail in “Jitter Buffer” on page 24.
To set the jitter buffer size for VoIP trunks:
1 In Unified Manager, open Services, IP Telephony, and click on H.323 trunks.
2 Click on the Media Parameters tab. The Media Parameters dialog appears:
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