Multitech MultiVOIP 100 MVP110 User Manual page 36

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 lists in the DTMF Gain
group.
Note: Only change the DTMF gain under the direction of Multi-Tech Technical Support.
9. To change the voice coder, select the Manual in the Coder group. Select the appropriate coder
from the Selected 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.
10. The Fax group enables you to send/receive faxes. You can set the maximum baud rate for faxes
and the fax volume in the two lists and change the jitter value in milliseconds.
When receiving fax packets from a remote MVP110, 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 MVP110 uses a Jitter Buffer. The Jitter Value box allows the MVP110 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.
11. You can enable the voice/fax advanced features by clicking (checking) 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 MVP110 will not transmit voice packets when
silence is detected, thereby reducing the amount of network bandwidth that is being used by the
voice channel.
This Echo Cancellation option defines whether echo cancellation is enabled for this voice
channel. If echo cancellation is enabled, the MVP110 will remove echo-delay which improves the
quality of sound.
The Forward Error Correction (FEC) option defines whether forward error correction is enabled
(checked) for this voice channel. The 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.
The Billing/Misc tab displays the parameters for auto call, automatic disconnection, billing
options and dynamic jitter buffer.
Chapter 3 - Software Loading and Configuration
36