User guide

44
Chapter 7 - Using the MultiVOIP Software
Multi-Tech Systems, Inc. MultiVOIP User Guide
The Input Gain and Output Gain lists enable you to select the amount of gain you want. Gain
is the increased signalling power that occurs as the signal is boosted by the MVP120. The
Input Gain list defines the voice input gain for the Voice/Fax channel. Before the MVP120
digitizes voice, the volume can be increased or decreased. Input gain modifies the level of
audio coming into the voice channel before it is sent over the Internet to a remote MultiVOIP.
The valid range for this option is +31dB to -31 dB. The recommended and default value is 0.
The Output Gain list defines the voice output gain for the Voice/Fax channel. Before the
MVP120 converts digital voice back to analog, the volume can be increased or decreased.
The output gain modifies the level of the audio being output to the device attached to the Voice/
Fax channel. The valid range for this option is +31dB to -31 dB. The recommended and
default value is 0.
The Fax group enables a fax machine to transmit and receive faxes through the MultiVOIP. If a
fax machine is connected to the voice/fax channel, the Max Baud Rate should be set to match
the baud rate of the fax machine. Refer to user documentation for your fax. The Fax Volume
setting controls the output level of the fax tones, and this setting should be changed only under
the direction of Multi-Tech’s Technical Support personnel.
Miscellaneous Group
The Silence Compression check box defines whether silence compression is enabled for the
selected voice channel. If enabled, the MultiVOIP will not transmit voice packets when silence
is detected, thereby reducing the amount of network bandwidth being used by the voice/fax
channel.
The Echo Cancellation check box defines whether echo cancellation is enabled for the voice/
fax channel. If enabled, the MultiVOIP will remove echo-delay, which improves sound quality.
The Forward Error Correction (FEC) check box enables recovery of some corrupted or lost
voice packets. FEC adds 50 % overhead to the total network bandwidth.
The DTMF Gain group controls the volume level of the digital tones sent out for Touchtone
dialing. The Gain High and Gain Low boxes control the gain in dB (decibels) of the High and
Low tones in the tone pairs; the default gain values are -4 dB and -7 dB, respectively. DTMF
Gain should not be changed except under supervision of Multi Tech’s Technical Support.
Billing/Security Tab
The Billing/Security tab displays the parameters for billing options, call authentication, and