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Chapter 4 - MultiVOIP Software
The Advanced Features group allows you to enable Silence Compression so that a MultiVOIP 200
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 for a particular voice channel
will remove echo and improve the quality of sound; and, Forward Error Correction allowing 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.
Billing/Misc
This tab controls the parameters for auto call, automatic disconnection, billing options, and dynamic
jitter buffer.
The Auto Call option allows the local MultiVOIP 200 to call a remote MultiVOIP 200 without the user
having to dial a Phone Directory Database number. As soon as you access the local MultiVOIP 200
voice/fax channel, the MultiVOIP 200 immediately connects to the remote MultiVOIP 200 that you
identified in the Remote MultiVOIP 200 Phone Number field of this option.
The Automatic Disconnection group provides three options which can be used singly or in any
combination. The Jitter Value defines the average inter-arrival packet deviation (in milliseconds)
before the call is automatically disconnected.The default is 20 milliseconds. A higher value means
voice transmission will be more accepting of jitter. A lower value is 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 is 30 packets.
Call Duration defines the maximum length of time (in seconds) that a call remains connected before
the call is automatically disconnected. The default 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.
Billing Options can be used to track the cost of Inbound and/or Outbound calls on any of the three
interfaces (FXO, FXS, or E&M). The amount to be charged in cents is entered in the Charge ( )
Cents field together with the associated time duration in the Per ( ) Seconds field. While a given
call is active, the accumulated charges can then be viewed on the Call Progress dialog box. When
the call ends, the charges are transferred to a Log File that can be viewed by highlighting the call
event in the Log Entries dialog box and selecting Details.
Dynamic Jitter Buffer defines a minimum and a maximum jitter value for voice communications.
When receiving voice packets from a remote MultiVOIP 200, 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 MultiVOIP 200 uses a Dynamic Jitter Buffer. The Jitter Buffer allows the MultiVOIP
200 to wait for delayed voice packets by automatically adjusting the length of the Jitter Buffer
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