Multitech MultiVOIP 800 MVP800 User's Guide download pdf (Page 29)

Chapter 3 - Software Loading and Configuration

16. 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.

17. You can set up the input and output voice gain so that the volume can be increased or

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

sent over the Internet to the remote MultiVOIP 400/800; and, 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 drop-down lists in the Voice Gain group. 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 drop-down lists in the

DTMF Gain group.

Note: Only change the DTMF gain under the direction of Multi-Tech Technical Support

supervision.

18. To change the voice coder, first select the channel by clicking the Select Channel down arrow

(highlighting the channel number) then click Manual in the Coder group. To select the appropriate

coder, click the Selected Coder down arrow and highlight your new voice coder entry.

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.

Note: If you allow the Coder to be selected automatically, then you need to select the Max

Bandwidth from the drop-down list. Check with your VOIP administrator to determine how much

bandwidth is available.

19. The Fax group enables you to send/receive faxes on the selected voice/fax channel. You can set

the maximum baud rate for faxes and the fax volume in the two drop-down lists and change the

jitter value in milliseconds.

When receiving fax packets from a remote MultiVOIP 400/800, 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 MultiVOIP 400/800 uses a Jitter Buffer. The Jitter Value field allows the MultiVOIP

400/800 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 50 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.

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Multitech MultiVOIP 800 MVP800 User's Guide Page 29