Multitech MultiVOIP 800 MVP800 User's Guide download pdf (Page 57)

Chapter 4 - MultiVOIP Software

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 400/800 to call a remote MultiVOIP 400/800 without

the user having to dial a Phone Directory Database number. As soon as you access the local

MultiVOIP 400/800 voice/fax channel, the MultiVOIP 400/800 immediately connects to the remote

MultiVOIP 400/800 that you identified in the Remote MultiVOIP 400/800 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 400/800, 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 400/800 uses a Dynamic Jitter Buffer. The Jitter Buffer allows the

MultiVOIP 400/800 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 MultiVOIP 400/800 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.

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Multitech MultiVOIP 800 MVP800 User's Guide Page 57