Multi-Tech Systems MVP120 - Manual (Page 26)

Multi-Tech Systems, Inc. MultiVOIP User Guide
Chapter 4 - Configuring the Master MultiVOIP
26
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, then you need to select the Max Bandwidth from
the 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, the fax volume, and change the jitter value in
milliseconds.
When receiving fax packets from a remote MVP120, 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 MVP120 uses a Jitter Buffer. The Jitter Value box allows
the MVP120 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.
20. You can enable the voice/fax advanced features by selecting the Silence Compression,
Echo Cancellation, or Forward Error Correction options.
The Silence Compression option defines whether silence compression is enabled for
the voice channel. If Silence Compression is enabled, the MVP120 will not transmit
voice packets when silence is detected, thereby reducing the amount of network
bandwidth that is being used by the voice channel.
If Echo Cancellation is enabled, the MVP120 will remove echo which improves the
quality of sound.
The Forward Error Correction (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 the voice channel.
21. The Billing/Misc tab displays the parameters for auto call, automatic disconnection,
billing options, and dynamic jitter buffer.
If you want to dedicate a local voice/fax channel to a remote voice/fax channel (so you
will not have to dial the remote channel number), click the Auto Call Enable option in the
Auto Call group. Then enter the phone number of the remote channel in the Phone
Number box.
22. The Automatic Disconnection group provides three options to be used singly or in
combination.