Multi-Tech Systems MVP120 - Manual (Page 49)

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Chapter 7 - Using the MultiVOIP Software
Multi-Tech Systems, Inc. MultiVOIP User Guide
For FXO-to-FXO communications, you can enable a specific kind of FXO Disconnect Options:
Current Loss, Tone Detection, or Silence Detection. Check with your in-house phone
personnel to verify the type of disconnect to use. If current lossis checked, the VOIP will hang up
when it detects a loss of current on the FXO (phone) port. For tone detection, select from the
lists one or two tones that will cause the line to disconnect. The person hanging up the call must
then press the key or keys that produce those tones to hang up a call. For silence detection,
select One Way or Two Way, then set the timer for the number of seconds of silence before
disconnect. The default value of 15 seconds may be shorter than desired for your application.
Voice/Fax Tab
The Voice/Fax tab controls voice and DTMF gain, voice coder, fax settings, and advanced
options.
In the Voice Gain group you can select the Input and Output voice gain. Gain is the increased
signaling power that occurs as the signal is boosted by the MVP120. The Input Gain list defines
the input gain for this voice channel. Before your MVP120 digitizes voice, the volume can be
increased or decreased. Input gain modifies the level of the audio coming into the voice channel
before it is sent over the Internet to the remote MVP120. 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 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 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 MVP120 will reproduce the DTMF tones
rather than passing them through with voice. When this option is checked the DTMF is sent via
RTP packets.
The MVP120 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.