Multi-Tech Systems MVP120 manual Configuring the Slave MultiVOIPs

Chapter 5 - Configuring the Slave MultiVOIPs

11.You can enable the voice/fax advanced features by clicking (checking) the silence compression, echo cancellation, or forward error correction options.

Silence Compression - Defines whether silence compression is enabled for the voice channel. If silence compression is enabled, the MVP120 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 - Defines whether echo cancellation is enabled for this voice channel. If echo cancellation is enabled, the MVP120 will remove echo-delay which improves the quality of sound.

Forward Error Correction (FEC) - Defines whether forward error correction is enabled (checked) for this voice channel. The FEC feature allows 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.

The Billing/Misc tab displays the parameters for auto call, automatic disconnection, billing options and dynamic jitter buffer.

12.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 MVP120 in the Phone Number box.

13.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.

Multi-Tech Systems, Inc. MultiVOIP User Guide 40