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Chapter 4 - MultiVOIP Software
Voice/Fax Tab
The Voice/Fax tab controls the voice coder, Fax settings, DTMF gain, and some miscellaneous
options.
The MultiVOIP 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 MultiVOIP. 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 for the fax machine. 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 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.
You can enable the voice/fax miscellaneous features by selecting the Silence Compression, Echo
Cancellation, or Forward Error Correction check boxes.
The Silence Compression check box defines whether silence compression is enabled for this voice
channel. If silence compression is enabled, the MultiVOIP 800 will not transmit voice packets when
silence is detected, thereby reducing the amount of network bandwidth that is being used by the
voice channel.
The Echo Cancellation check box defines whether echo cancellation is enabled for this voice
channel. If echo cancellation is enabled, the MultiVOIP 800 will remove echo delay, which improves
the quality of sound.
The Forward Error Correction (FEC) check box defines whether forward error correction is enabled
for this voice channel. The FEC feature allows some of the voice packets that were corrupted or lost
to be recovered. FEC adds an additional 50% overhead to the total network bandwidth consumed by