Multi-Tech Systems MVP120 - Manual (Page 40)

40
Chapter 5 - Configuring the Slave MultiVOIPs
Multi-Tech Systems, Inc. MultiVOIP User Guide
11. You can enable the voice/fax advanced features by clicking (checking) the silence
compression, echo cancellation, or forward error correction options.
Silence Compression - 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.
Echo Cancellation - Defines whether echo cancellation is enabled for this voice channel. If
echo cancellation is enabled, the MVP120 will remove echo-delay which improves the quality
of sound.
Forward Error Correction (FEC) - 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.
12. 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), click the Auto Call Enable option in the Auto Call
group. Then enter the phone number of the remote MVP120 in the Phone Number box.
13. The Automatic Disconnection group provides three options to be used singly or in
combination.
The Jitter Value defines the average inter-arrival packet deviation (in milliseconds) before
the call is automatically disconnected. Jitter is the inter-arrival packet deviation (phase shift of
digital pulses) over the transmission medium that causes voice breakup which can be
particularly disruptive to voice communications. The default setting is 20 milliseconds. A
higher value means that the voice transmission will be more accepting of jitter. A lower value
will be less tolerant of jitter.
Consecutive Packets Lost defines the number of consecutive packets that are lost after
which the call is automatically disconnected. The default setting is 30 packets.