Multi-Tech Systems MVP120 manual Configuring the Master MultiVOIP

Chapter 4 - Configuring the Master MultiVOIP

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 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.

23.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.

24.A minimum and maximum set of values can be set for Dynamic Jitter Buffer. 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 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.

If your country/region is not the default USA, click the Regional tab and proceed to step 25; otherwise, click OK and proceed to step 26 to begin building your phone directory database.

25.To change the Tone Pairs on the Regional tab, select your country or region from the Country/Region list. If your country or region is not listed, click Custom to define it.

The Tone Pairs group enables you to select and modify the parameters. Click OK when finished. Proceed to Step 26 to begin building your phone directory database.

26.The Phone Directory Database dialog box displays with the Proprietary PhoneBook option enabled and no phone numbers entries displayed in the database. This dialog box

Multi-Tech Systems, Inc. MultiVOIP User Guide 27