Draytek Vigor2920n User Manual page 89

Ring Pattern
Prefer Codec
Packet Size
Voice Active Detector
Choose a ring tone type for the VoIP phone call.
Select one of five codecs as the default for your VoIP calls. The
codec used for each call will be negotiated with the peer party
before each session, and so may not be your default choice. The
default codec is G.729A/B; it occupies little bandwidth while
maintaining good voice quality.
If your upstream speed is only 64Kbps, do not use G.711 codec.
It is better for you to have at least 256Kbps upstream if you
would like to use G.711.
Only the selected Codec will be applied.
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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Vigor2920 Series User's Guide