Multi-Tech Systems MVP120 - Manual (Page 51)

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Chapter 7 - Using the MultiVOIP Software
Multi-Tech Systems, Inc. MultiVOIP User Guide
Billing Options can be used to track the cost of Inbound and/or Outbound calls on the FXO
interface. The amount to be charged in cents is entered in the Charge ( ) Cents box together
with the associated time duration in the Per ( ) Seconds box. 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 selecting 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 MVP120, 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 MVP120 uses a Dynamic Jitter Buffer. The Jitter Buffer allows the MVP120 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
of the jitter buffer directly effects the voice delay between MVP120 gateways.
The default minimum dynamic jitter buffer of 150 milliseconds is the minimum delay that would be
acceptable over a low jitter network. The default maximum dynamic jitter buffer of 300
milliseconds is the maximum delay tolerable over a high jitter network.
The Optimization Factor determines how quickly the length of the Dynamic Jitter Buffer is
changed based on actual jitter encountered on the network. Selecting the minimum value of 0
means low voice delay is desired, but increases the possibility of jitter induced voice quality
problems. Selecting the maximum value of 12 means highest voice quality under jitter conditions
is desired at the cost of increased voice delay.
The Optimization Factor can be configured in the range of 0 to 12 with a default setting of 7.
Regional Tab
The Regional tab controls the voice communications for the country or region in which the
MVP120 is being used.
From the Country/Region list, select the country or region for which you are configuring the
MVP120. The Tone Pairs group always displays the tones used in the country or region currently
selected. In addition to Australia, Central America, Chile, Europe, France, Japan, UK, and USA,
there is a Custom selection (with defaults identical to USA) . Clicking the Custom button
enables you to edit the Tone Pairs and establish custom sets of tone pairs for Dial Tone, Ring,
and Busy on a Custom Tone Pair Settings dialog box.
The Pulse Generation Ratio group contains two ratios: the 60/40 is for the USA, and the 67/33
ratio is for international applications.