Multitech MVP200 User Giude page 43

Chapter 4 - MultiVOIP Software
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 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. See Chapter 6 - Warranty, Service and Tech Support.
You can enable the voice/fax advanced features by selecting the Silence Compression, Echo
Cancellation, or Forward Error Compression check boxes in the 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 channel.
The Echo Cancellation check box defines whether echo cancellation is enabled for the selected
voice 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 MultiTech's Technical Support.
Billing Options can be used to track the cost of Inbound and/or Outbound calls on any of the three
interfaces (FXO, FXS, or E&M). The amount to be charged in cents is entered in the Charge ( )
Cents box together with the associated time duration in the Per ( )Seconds box. While a given call
is active, the accumulated charges can then be viewed on the Call Progress dialog box. When the
call ends, the charges are transferred to a Log File that can be viewed by highlighting the call event in
the Log Entries dialog box and selecting Details.
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