Multitech MultiVOIP 800 MVP800 User's Guide download pdf (Page 45)

Chapter 3 - Software Loading and Configuration

The Billing/Misc tab displays the parameters for auto call, automatic disconnection, billing

options and dynamic jitter buffer.

13. 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 MultiVOIP 400/800 in the Phone Number field.

14. 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.

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.

15. 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.

16. A minimum and maximum set of values can be set for Dynamic Jitter Buffer. 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 Minimum Jitter Value default setting is 150 milliseconds, the Maximum Jitter Value default

setting is 300 milliseconds, and the Optimization Factor default setting is 7.

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Multitech MultiVOIP 800 MVP800 User's Guide Page 45