Manual

Chapter 5 - Configuring the Slave MultiVOIPs

Multi-Tech Systems, Inc. MultiVOIP User Guide

7. The Voice/Fax tab displays the parameters for the voice gain, DTMF (Dual Tone Multi-

Frequency) gain, voice coder, faxing, and advanced features such as Silence Compression,

Echo Cancellation, and Forward Error Correction.

8. Input gain modifies the level of the audio coming in to the voice channel before it is sent over

the Internet to the remote MVP120. Output gain modifies the level of the audio being output

to the device attached to the voice channel. Make your selections from the Input and Output

lists. The valid range is +31dB to –31dB with a recommended/default value of 0.

You can also set up the DTMF Gain (or output level in decibels - dB) for the higher and lower

frequency groups of the DTMF tone pair. Make your selections in the lists in the DTMF Gain

group.

The DTMF Out of Band check box is selected so the MVP120 will reproduce the DTMF

tones rather than passing them through with voice. When this option is checked the DTMF is

sent via RTP packets.

Note: Only change the DTMF Gain under direction os Multi-Tech Technical Support.

9. To change the voice coder, select the Manual in the Coder group. Select the appropriate

coder from the Selected Coder list.

If you changed the voice coder, ensure that the same voice coder is used on the voice/fax

channel you are calling. Otherwise, you will always get a busy signal.

10. The Fax group enables you to send/receive faxes. You can set the maximum baud rate for

faxes and the fax volume in the two lists and change the jitter value in milliseconds.

When receiving fax packets from a remote MVP120, it is possible for individual packets to be

delayed or received out of order due to traffic conditions on the network. To compensate for

this effect, the MVP120 uses a Jitter Buffer. The Jitter Value box allows the MVP120 to wait

a user-definable period of time, in milliseconds, for delayed or out of order fax packets. The

range of allowable Jitter Values is 0 to 400 with a default of 400 milliseconds.

If you do not plan to send or receive faxes on a given voice/fax channel, you can disable

faxes in the Fax group.