Multi-Tech Systems MVP400 - Manual (Page 21)

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Configuring the MultiVOIP
16. The Voice/Fax tab displays the parameters for the voice
gain, DTMF (Dual Tone Multi-Frequency) gain, voice
coder, faxing, and advanced features such as Silence
Compression, Echo Cancellation, and Forward Error
Correction.
17. You can set the input and output voice gain so that the
volume can be increased or decreased. Input gain
modifies the level of the audio coming in to the voice
channel before it is sent over the Internet to the remote
MultiVOIP 400/800. Output gain modifies the level of the
audio being output to the device attached to the voice
channel. Make your selections from the Input and Output
lists in the Voice Gain group. The valid range is +31dB to
–31dB with a recommended default value of 0.
You can set up the DTMF gain (output level in decibels) for
the higher and lower frequency groups of the DTMF tone
pair. Make your selections from the High and Low lists in
the DTMF Gain group. When the DTMF Out of Band
check box is selected, the unit reproduces the DTMF
tones instead of passing them through.