Multitech MultiVOIP 100 MVP110 User Manual page 26

silence is detected, thereby reducing the amount of network bandwidth that is being used by the
voice channel.
If Echo Cancellation is enabled, the MVP110 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.
20. 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), click the Auto Call Enable option in the Auto Call group. Then
enter the phone number of the remote MVP110 in the Phone Number box.
21. 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.
Call Duration defines the maximum length of time (in seconds) that a call remains connected
before the call is automatically disconnected. The default setting is 180 seconds. A call limit of
three minutes may be too short for most configurations. Therefore, you may want to increase this
default value.
22. You can set billing options for inbound and/or outbound calls by checking them in the Billing
Options group and then entering the charge in cents per number of seconds.
23. A minimum and maximum set of values can be set for Dynamic Jitter Buffer. When receiving
voice packets from a remote MVP110, it is possible to experience varying delays between
packets due to traffic conditions on the network. This is called Jitter. To compensate for this
effect, the MVP110 uses a Dynamic Jitter Buffer. The Jitter Buffer allows the MVP110 to wait for
delayed voice packets by automatically adjusting the length of the Jitter Buffer between
configurable minimum and maximum values. An Optimization Factor adjustment controls how
quickly the length of the Jitter Buffer is increased when jitter increases on the network. The length
Chapter 3 - Software Loading and Configuration
26