MultiVOIP Quick Start Guide
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10. To change the voice coder, the channel from the Select
Channel list, then click Manual in the Coder group. To
select the appropriate coder, select your new voice coder
entry 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.
Note: If you allow the Coder to be selected automatically,
enter the Max Bandwidth. Check with your network
administrator to determine how much bandwidth is
available.
11. 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 ef fect, the MultiVOIP 400/
800 uses a Jitter Buffer. The Jitter Value 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
milliseconds 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.
12. 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 400/800
will not transmit voice packets when silence is detected,
thereby reducing the amount of network bandwidth that is
being used by the voice channel.