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Chapter 3 – Related MultiVOIP Setup Parameters
Multi-Tech Systems, Inc. Avaya Communication Manager Guide 39
Voice/Fax Parameter Definitions Continued
Field Name Values Description
Coder Parameters (cont’d)
Selected
Coder
G.711 a/u law 64 kbps;
G.726, @ 16/24/32/40
kbps;
G.727, @ nine bps rates;
G.723.1 @ 5.3 kbps,
6.3 kbps;
G.729, 8kbps;
Net Coder @ 6.4, 7.2, 8,
8.8, 9.6 kbps
G.711/G.729
G.729/G.711
Select from a range of coders with specific bandwidths.
The higher the bps rate, the more bandwidth is used.
The channel that you are calling must have the same
voice coder selected.
Default = G.723.1 @ 6.3 kbps, as required for H.323.
Here 64K of digital voice are compressed to 6.3K,
allowing several simultaneous conversations over the
same bandwidth that would otherwise carry only one.
To make selections from the Selected Coder drop-down
list, the Manual option must be enabled.
Max
bandwidth
(coder)
11 – 128 kbps
This drop-down list enables you to select the maximum
bandwidth allowed for this channel. The Max
Bandwidth drop-down list is enabled only if the Coder
is set to Automatic.
If coder is to be selected automatically (“Auto” setting),
then enter a value for maximum bandwidth.
Advanced Features
Silence
Compression
Y/N
Determines whether silence compression is enabled (checked)
for this voice channel.
With Silence Compression enabled, the MultiVOIP will not
transmit voice packets when silence is detected, thereby
reducing the amount of network bandwidth that is being used
by the voice channel.
Default = off.
Echo
Cancellation
Y/N Determines whether echo cancellation is enabled (checked) for
this voice channel.
Echo Cancellation removes echo and improves sound quality.
Default = on.
Forward
Error
Correction
Y/N
Determines whether forward error correction is enabled
(checked) for this voice channel.
Forward Error Correction enables 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. Default = Off