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Chapter 3 - Software Loading and Configuration
14. To change the voice coder, select the channel from the Select Channel list, then 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 always get a busy signal.
15. If you selected the FXO interface and are using touchtone dialing, you can 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 from the lists in the DTMF Gain group. In the Duration box, enter the
DTMF tone duration in milliseconds. 100 is entered by default
Note: Only change the DTMF gain under the direction of Multi-Tech Technical Support.
16. The Fax group enables you to send and receive faxes on the selected voice/fax channel. You
can select the maximum baud rate for faxes from the list in the Fax group. If you do not plan to
send or receive faxes on a given voice/fax channel, you can disable faxes in the Fax group.
Note: After configuring a given channel, you can copy that channel’s configuration to any other
channel by clicking Copy. Everything on the Voice/Fax tab will be copied to the other channel.
17. You can enable the voice/fax advanced features by selecting the Silence Compression, Echo
Cancellation, or Forward Error Correction check boxes.
The Silence Compression check box defines whether silence compression is enabled for this
voice channel. If silence compression is enabled, the MultiVOIP 800 will not transmit voice
packets when silence is detected, thereby reducing the amount of network bandwidth that is
being used by the voice channel.
The Echo Cancellation check box defines whether echo cancellation is enabled for this voice
channel. If echo cancellation is enabled, the MultiVOIP 800 will remove echo delay, which
improves the quality of sound.
The Forward Error Correction (FEC) check box defines whether forward error correction is
enabled 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.