Draytek Vigor2710 Series User Manual page 238

Packet Size
Voice Active Detector
Vigor2710 Series User's Guide
Single Codec – If the box is checked, only the selected Codec
will be applied.
The amount of data contained in a single packet. The default
value is 20 ms, which means the data packet will contain 20
ms voice information.
This function can detect if the voice on both sides is active or
not. If not, the router will do something to save the bandwidth
for other using. Click On to invoke this function; click Off to
close the function.
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