User guide

Chapter 3 - Software Loading and Configuration

The Voice/Fax tab displays the parameters for the voice coder, faxing, and DTMF gain.

14. To change the voice coder, select the new voice coder entry from the Voice 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 get a busy signal.

15. The Fax group enables you to select the maximum baud rate for faxes and adjust the fax

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

disable faxes in the Fax group.

16. You can enable the voice/fax advanced features by selecting the Silence Compression, Echo

Cancellation, or Forward Error Compression check boxes in the Miscellaneous group.

The Silence Compression check box defines whether silence compression is enabled for the

selected voice channel. If enabled, the MultiVOIP will not transmit voice packets when silence

is detected, thereby reducing the amount of network bandwidth being used by the voice chan-

nel.

The Echo Cancellation check box defines whether echo cancellation is enabled for the

selected voice channel. If enabled, the MultiVOIP will remove echo, which improves sound

quality.

The Forward Error Correction (FEC) check box enables recovery of some corrupted or lost

voice packets. FEC adds 50 % overhead to the VOIPs required network bandwidth while the

call is active.