Draytek Vigor 2200V, User Manual

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VoIP Setup
9-10
Default Codec
Select one of five CODECs as the default for your VoIP calls. The
CODEC used for each call will be negotiate with the peer party before
each session, and so many 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
Packet Size
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.
DTMF InBand
With this selected the Vigor will send DTMF tones as audio directly in the
Voice stream when you press a key on the keypad.
DTMF OutBand
With OutBand selected the Vigor will capture the keypad number
pressed, transform it to a digital form and send to the other side outside
of the Voice stream; the receiver will generate the tone according to the