Managing Existing Virtual Tie Lines 107
Enabling Audio
Compression
You can enable or disable ADPCM (Adaptive Differential Pulse Code
Modulation) audio compression on a system-wide basis for VTLs. The
default condition disables audio compression.
When you enable VTL audio compression on an NBX system the VTL
software attempts to use audio compression on all VTL calls. If the NBX
system on the other end of the VTL call is not configured to support
audio compression, the local VTL software attempts to find a compatible
communications mode.
To enable VTL audio compression:
1 In the NBX NetSet - Main Menu window, click System Configuration.
2 Click the System Settings tab.
3 Click the System-wide button. The System Configuration - System
Settings dialog box (Figure 39
) appears.
Figure 39 System-wide Setting Dialog Box
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