Multitech MultiVOIP 200 MVP200, Руководство пользователя

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MultiVOIP 200 User Guide
Voice/Fax
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 MultiVOIP 200. The Input Gain drop-down
list defines the input gain for this voice channel. Before your MultiVOIP 200 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 MultiVOIP 200. The valid range for this option
is +31dB to –31dB. The recommended and default value is 0. The Output Gain drop-down list defines
the voice output gain for this voice channel. Before your MultiVOIP 200 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 fields 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 function DTMF Out of Band is checked (enabled) so the MultiVOIP 200 will reproduce the DTMF
tones rather than passing them through from the input to the output.
The MultiVOIP 200 supports many state-of-the art ITU (International Telecommunications Union)
voice coders. The Voice Coder drop-down menu 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 MultiVOIP 200. If a
fax machine is connected to one of the voice/fax channels, 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).