Multi-Tech Systems MVP200 - Manual (Page 21)

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Configure Host MultiVOIP
16. To change the voice coder, select the channel from the
Select Channel list, then select the new voice coder entry
from the Voice Coder list.
If you changed the voice coder, ensure that the same voice
coder is used on the voice/fax channel you are calling.
Otherwise, you will always get a busy signal.
17. If you selected the FXO interface and are using touchtone
dialing, you can set up the DTMF gain (or output level in
decibels - dB) for the higher and lower frequency groups
of the DTMF tone pair. Make your selections from the lists
in the DTMF Gain group. In the Duration box, enter the
DTMF tone duration in milliseconds. 100 is entered by
default.
Note: Only change the DTMF gain under the direction of
Multi-Tech Technical Support.
18. The Fax group enables you to send and receive faxes on
the selected voice/fax channel. You can select the
maximum baud rate for faxes from the list in the Fax
group. If you do not plan to send or receive faxes on a
given voice/fax channel, you can disable faxes in the Fax
group.