Draytek Vigor2850 Series User Manual page 265

Volume Gain
MISC
DTMF
Also, you can specify each field for your necessity. It is
recommended for you to use the default settings for VoIP
communication.
Mic Gain (1-10)/Speaker Gain (1-10) - Adjust the volume
of microphone and speaker by entering number from 1- 10.
The larger of the number, the louder the volume is.
Dial Tone Power Level - This setting is used to adjust the
loudness of the dial tone. The smaller the number is, the
louder the dial tone is. It is recommended for you to use the
default setting.
Ring Frequency - This setting is used to drive the
frequency of the ring tone. It is recommended for you to use
the default setting.
Call Waiting Tone Power Level - This setting is used to
adjust the loudness of the call waiting tone. The smaller the
number is, the louder the tone is. It is recommended for you
to use the default setting.
DTMF Mode – There are four DTMF modes for you to
choose.
InBand - Choose this one then the Vigor will send the
DTMF tone as audio directly when you press the
keypad on the phone.
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Vigor2850 Series User's Guide