Draytek Vigor2100V User Manual page 108

The amount of data contained in a single packet. The default
value is 20 ms, which means the data packet will contain 20 ms
Packet Size
voice information.
With this selected the Vigor will send DTMF tones as audio
DTMF InBand
directly in the Voice stream when you press a key on the
keypad.
With OutBand selected the Vigor will capture the keypad
number pressed, transform it to a digital form and send to the
DTMF
other side outside of the Voice stream; the receiver will generate
OutBand
the tone according to the digital form it receives. This function is
very useful when network traffic congestion occurs to maintain
the accuracy of DTMF tones.
The default value is 101, but can be anything from 96 to 127.
DTMF Payload
Type
Enable this option to let the SIP proxy send DTMF tones to the
SIP INFO
dialed peer.
Specifies the start and end port for RTP stream. The default
RTP
values are 10050 and 15000
VoIP
.
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