Voice/Fax Tab - Multitech MultiVOIP 100 MVP110 User Manual

Chapter 4 - MultiVOIP Software

Voice/Fax tab

The Voice/Fax tab controls voice and DTMF gain, voice coder, fax settings, and advanced options.
The Voice Gain group enables you to select the Input and Output voice gain. Gain is the increased
signaling power that occurs as the signal is boosted by the MVP110. The Input Gain list defines the
input gain for this voice channel. Before your MVP110 digitizes voice, 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 MVP110. The valid range for this option is +31dB to –31dB. The
recommended and default value is 0. The Output Gain list defines the voice output gain for this voice
channel. Before your MVP110 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 channel. The valid range for this option is +31dB to –31dB. The recommended and default
value is 0.
The DTMF Gain (Dual Tone Multi-Frequency) group controls the volume level of the digital tones sent
out for Touchtone dialing. The Gain High and Gain Low lists 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 MultiTech's Technical Support.
The DTMF Out of Band check box is selected so the MVP110 will reproduce the DTMF tones rather
than passing them through from the input to the output.
The MVP110 supports many state-of-the art ITU (International Telecommunications Union) voice
coders. The Voice Coder list enables you to select from a range of coders with specific bandwidths.
The higher the bps rate, the more bandwidth is used. The channel that you are calling has to have
the same voice coder selected. Otherwise, you will always get a Busy signal.
The Fax group enables a fax machine to transmit and receive faxes through the MVP110. 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). 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 (see Chapter 6 - Warranty, Service and Tech Support). The Jitter Value
setting defines the inter-arrival packet deviation (in milliseconds) for the fax transmission. A higher
value will increase the amount of delay (allowing for a higher percentage of packets to be
reassembled) and a lower value would decrease the amount of delay (a lower percentage of packets
would be reassembled).
The Advanced Features group allows you to enable Silence Compression so that a MVP110 will
not transmit voice packets when silence is detected, thereby reducing the amount of network
bandwidth that is being used by the voice channel; Echo Cancellation for the voice channel will
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