Multitech MultiVOIP 200 MVP200, User Manual

Page: 29 / 113

29
Chapter 3 - Software Loading and Configuration
16. The Voice/Fax tab displays the parameters for the voice gain, DTMF (Dual Tone Multi-
Frequency) gain, voice coder, faxing, and advanced features such as Silence Compression,
Echo Cancellation, and Forward Error Correction.
17. You can set up the input and output voice gain so that 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; and, output gain modifies the level of the
audio being output to the device attached to the voice channel. Make your selections from the
Input and Output drop-down lists in the Voice Gain group. The valid range is +31dB to –31dB
with a recommended/default value of 0.
You can also set up the DTMF gain (or output level in decibels - dB) for the higher and lower
frequency groups of the DTMF tone pair. Make your selections in the drop-down lists in the
DTMF Gain group. When DTMF Out of Band is checked, the unit reproduces the DTMF tones
instead of passing them through.
Note: Only change the DTMF gain under the direction of Multi-Tech Technical Support
supervision.
18. To change the voice coder, first select the channel by clicking the Select Channel down arrow
(highlighting the channel number) then click Manual in the Coder group. To select the appropriate
coder, click the Selected Coder down arrow and highlight your new voice coder entry.
If you changed the voice coder, ensure that the same voice coder is used on the voice/fax
channel you are calling; otherwise, you will always get a busy signal.
Note: If you allow the Coder to be selected automatically, then you need to select the Max
Bandwidth from the drop-down list. Check with your Network Administrator to determine how
much bandwidth is available.
19. The Fax group enables you to send/receive faxes on the selected voice/fax channel. You can set
the maximum baud rate for faxes and the fax volume in the two drop-down lists and change the
jitter value in milliseconds.
When receiving fax packets from a remote MultiVOIP 200, it is possible for individual packets to
be delayed or received out of order due to traffic conditions on the network. To compensate for
this effect, the MultiVOIP 200 uses a Jitter Buffer. The Jitter Value field allows the MultiVOIP 200
to wait a user-definable period of time, in milliseconds, for delayed or out of order fax packets.
The range of allowable Jitter Values is 0 to 400 with a default of 400 milliseconds.
If you do not plan to send or receive faxes on a given voice/fax channel, you can disable faxes in
the Fax group.