User guide

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Chapter 5 - Configuring the Client MultiVOIPs
Multi-Tech Systems, Inc. MultiVOIP User Guide
To change the voice coder, select the new voice coder entry from the Voice Coder
list.
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 Automatic Coder is selected, enter the bandwidth in the Max Bandwidth
box. Check with your Network Administrator to determine available bandwidth.
8. The Fax group enables you to select the maximum baud rate for faxes and adjust the
fax volume. If you do not plan to send or receive faxes on a given voice/fax channel,
you can disable faxes in the Fax group.
The Miscellaneous group lets you set voice/fax advanced features by clicking
(checking) Silence Compression, Echo Cancellation, or Forward Error
Compression.
The Silence Compression option defines whether silence compression is enabled
for the selected voice channel. If enabled, the MVP120 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 options defines whether echo cancellation is enabled for the
selected voice channel. If enabled, the MVP120 will remove echo, which improves
sound quality.
The Forward Error Correction (FEC) option defines whether FEC is selected for the
voice channel. This features allows some of the voice packets that were corrupted or
lost to be recovered. FEC adds 50 % overhead to the total network bandwidth
consumed by the voice channel.