D-Link DPH-300S User Manual page 35

Configuration
SIP TELEPHONY
DTMF Method – Out-of band Dual Tone Multi-frequency – The Dual
Tone Multi-frequency (DTMF) mode sets how the router will handle
the tones that your telephone makes when you push its buttons. It
is recommended that you use the same mode that your VoIP service
provider uses.
Payload Type – A payload type is a number from 96 through 127
that identifies the type of payload carried in the packet. For example,
a payload type of 122 denotes a fax payload. This field is only active
when the DTMF method is set to RFC 2833.
VAD – Voice Activity Detection (VAD) – detects whether or not
speech is present. This lets the router reduce the bandwidth that a
call uses by not transmitting "silent Packets" when you are not
speaking.
Country Code – You can select the default country code for your
area.
D-Link DPH-300S User Manual 35