Draytek Vigor2920 Series User Manual page 349

Item
Volume Gain
MISC
DTMF
Description
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.

OutBand - Choose this one then the Vigor will capture
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Vigor2920 Series User's Guide